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BEGIN:VEVENT
DTSTART;TZID=UTC:20230511T090000
DTEND;TZID=UTC:20230511T100000
DTSTAMP:20260407T090451
CREATED:20230509T132133Z
LAST-MODIFIED:20230509T132133Z
UID:8211-1683795600-1683799200@www.lapth.cnrs.fr
SUMMARY:DM indirect searches with cosmic-ray antiparticles
DESCRIPTION:Speakers: Pedro de la Torre Luque (Stockholm University) \nThe creation of antiparticles in the Galaxy has been discussed as a potential signal of exotic production mechanisms such as primordial black hole evaporation or dark matter decay/annihilation\, in addition to the more conventional production from cosmic-ray (CR) interactions. Recent CR detectors have provided very accurate measurements on the spectra of antiprotons and positrons that we use to search for evidence of new physics. In addition\, the exciting first measurements of the flux of anti-nuclei can be achievable in a few years.In this talk\, I discuss the uncertainties related to the modelling of these antiparticles and show state-of-art predictions of their spectra. We will also talk about recent dark matter constraints from antiprotons and positrons and discuss the expected fluxes of anti-deuteron and anti-helium from global analyses of different CR observables in view of the first tentative detection of anti-nuclei events by the AMS-02 collaboration. Finally\, if time allows it\, I will discuss an ongoing study where we use CR data to place constrains of DM candidates beyond WIMPs (e.g. ALPs\, sterile neutrinos\, …) coupling with electrons. \nhttps://indico.in2p3.fr/event/29312/
URL:https://www.lapth.cnrs.fr/en/event/dm-indirect-searches-with-cosmic-ray-antiparticles/
LOCATION:Auditorium (LAPTh)
CATEGORIES:Upcoming Journal Club,Upcoming Lectures,Upcoming Seminars,Upcoming Workshops,Weekly seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=UTC:20230509T090000
DTEND;TZID=UTC:20230509T100000
DTSTAMP:20260407T090451
CREATED:20230509T132132Z
LAST-MODIFIED:20230509T132132Z
UID:8210-1683622800-1683626400@www.lapth.cnrs.fr
SUMMARY:News from the Universe: A Trio of Intriguing Developments in Astrophysics and Cosmology
DESCRIPTION:Speakers: Christopher Eckner (CNRS\, LAPTh) \n Abstract:I will present three recent papers advancing our understanding of astrophysics and cosmology. The covered papers are:I)  arXiv:2304.0607: “The Image of the M87 Black Hole Reconstructed with PRIMO”   A crisper image of the supermassive black hole of M87 with machine learningII)  arXiv:2304.09895: “Anomalies in Gravitational-Lensed Images Revealing Einstein Rings Modulated by Wavelike Dark Matter”   Using strong gravitational lensing to discriminate between fuzzy and WIMP-like dark matter III) arXiv:2304.10934: “A Cross-correlation Study between IceCube Neutrino Events and the Fermi Unresolved Gamma-ray Sky”    Where do all the very-high-energy neutrinos detected by IceCube come from?  \nhttps://indico.in2p3.fr/event/29748/
URL:https://www.lapth.cnrs.fr/en/event/news-from-the-universe-a-trio-of-intriguing-developments-in-astrophysics-and-cosmology/
LOCATION:Auditorium (LAPTh)
CATEGORIES:Upcoming Journal Club,Upcoming Lectures,Upcoming Seminars,Upcoming Workshops,Weekly seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20221014T090000
DTEND;TZID=Europe/Paris:20221014T183000
DTSTAMP:20260407T090451
CREATED:20220620T162958Z
LAST-MODIFIED:20220620T163037Z
UID:7820-1665738000-1665772200@www.lapth.cnrs.fr
SUMMARY:Alpine Strings 2022
DESCRIPTION:This 1-day workshop aims at gathering in Annecy the local string and quantum field theory community for fruitful exchanges on active research topics. Those include: \n\nBootstrap\n \nSwampland program and string phenomenology\nSupergravity and Exceptional Field Theories\n\nParticipating institutions are mainly LPENS (Lyon)\, IP2I (Lyon)\, LAPTh (Annecy)\, CERN (Meyrin)\, UNIGE (Geneva) and EPFL (Lausanne). Young researchers are particularly encouraged to participate. \nA preliminary list of speakers includes: \n\nTBA\n\n  \nTravel \nAnnecy can be reached by train (SNCF\, SBB)\, bus (including B272\, or Flixbus)\, car (including car-sharing Blablacar). \nDetailed information on how to access the LAPTh can be found on this page; in particular\, buses connecting the station and the LAPTh are indicated. \n  \nLunch and dinner \nThere is no lunch option close to the LAPTh (no shop\, canteen\, etc.). A vegetarian lunch can be provided on both days. Please indicate your interest when registering. \nA pizza dinner will be proposed on the 14th October. \n  \nAccomodation \nA hotel for the night 13-14th October will be proposed when registering. \n  \nInternet \nEduroam is available at LAPTh. Another possibility is to get a guest access when you arrive. \n  \n  \nThis workshop is funded thanks to the AAP USMB “Bootstrapping the Swampland”. It is part of the AnLy activities. \nLocal organisers: D. Andriot\, P. Tourkine.
URL:https://www.lapth.cnrs.fr/en/event/alpine-strings-2022/
CATEGORIES:Upcoming Workshops
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20220908T110000
DTEND;TZID=Europe/Paris:20220908T120000
DTSTAMP:20260407T090451
CREATED:20220620T163000Z
LAST-MODIFIED:20220620T163039Z
UID:7824-1662634800-1662638400@www.lapth.cnrs.fr
SUMMARY:Newtonian regime in a spherical or hyperbolic universe and consequences for the role of spatial curvature in cosmology
DESCRIPTION:The standard model of cosmology currently allows for three types of geometries for our Universe (Euclidean\, spherical or hyperbolic)\, each of these types corresponding to a set of different (multiconnected)-topologies. Among these geometries\, Newton’s theory of gravity is only defined on the Euclidean one. Still\, extending the validity of this theory to the two other cases\, with the aim that this should constitute the limit of a relativistic theory of gravity\, could provide a strong theoretical tool to probe large scale effects of global topology. \n  The first part of this presentation will aim at constructing such a theory\, using the concept of Galilean structures. We will see that it allows to quantify the effects of topology on the gravitational potential and structure formation.\n  In the second part\, I will show that Einstein’s equation is necessarily incompatible with such an extension of Newton’s theory. However\, as a physical hypothesis for our Universe\, if we require the Newtonian regime to exist regardless of the global geometry and topology\, then Einstein’s equation should be modified. This can be done by adding a “topological term’’ arising from the introduction of a second non-dynamical metric in the theory. The main consequence of this modification is that the expansion law of a homogeneous and isotropic solution no longer features the spatial curvature (i.e. $Omega = 1\,  forall Omega_k$). I will argue that this result gives a simple solution to the flatness problem\, and asks for a reevaluation of the spatial curvature from current cosmological data.
URL:https://www.lapth.cnrs.fr/en/event/newtonian-regime-in-a-spherical-or-hyperbolic-universe-and-consequences-for-the-role-of-spatial-curvature-in-cosmology/
CATEGORIES:Weekly seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20220829T090000
DTEND;TZID=Europe/Paris:20220902T170000
DTSTAMP:20260407T090451
CREATED:20220620T162956Z
LAST-MODIFIED:20220620T163037Z
UID:7813-1661763600-1662138000@www.lapth.cnrs.fr
SUMMARY:RAQIS 22
DESCRIPTION:Recent Advances in Quantum Integrable Systems
URL:https://www.lapth.cnrs.fr/en/event/raqis-22/
CATEGORIES:Upcoming Workshops
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20220707T110000
DTEND;TZID=Europe/Paris:20220707T120000
DTSTAMP:20260407T090452
CREATED:20220620T163001Z
LAST-MODIFIED:20220620T163039Z
UID:7825-1657191600-1657195200@www.lapth.cnrs.fr
SUMMARY:Presentations doctorants
DESCRIPTION:
URL:https://www.lapth.cnrs.fr/en/event/presentations-doctorants/
CATEGORIES:Weekly seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20220630T110000
DTEND;TZID=Europe/Paris:20220630T120000
DTSTAMP:20260407T090452
CREATED:20220620T163001Z
LAST-MODIFIED:20220620T163039Z
UID:7826-1656586800-1656590400@www.lapth.cnrs.fr
SUMMARY:Presentations doctorants
DESCRIPTION:
URL:https://www.lapth.cnrs.fr/en/event/presentations-doctorants-2/
CATEGORIES:Weekly seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20220628T110000
DTEND;TZID=Europe/Paris:20220628T120000
DTSTAMP:20260407T090452
CREATED:20220620T162948Z
LAST-MODIFIED:20220620T163036Z
UID:7796-1656414000-1656417600@www.lapth.cnrs.fr
SUMMARY:[Journal Club] Björn Herrmann
DESCRIPTION:Abstract: \n  \nZoom link: \nhttps://cnrs.zoom.us/j/91049381574?pwd=TDZyU3NqT0k4MFk3cUMvc0JuOURCdz09
URL:https://www.lapth.cnrs.fr/en/event/journal-club-bjorn-herrmann/
CATEGORIES:Upcoming Journal Club
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20220623T110000
DTEND;TZID=Europe/Paris:20220623T120000
DTSTAMP:20260407T090452
CREATED:20220620T163003Z
LAST-MODIFIED:20220620T163038Z
UID:7831-1655982000-1655985600@www.lapth.cnrs.fr
SUMMARY:Star forming galaxies as cosmic ray factories: a multimessenger view
DESCRIPTION:Star forming galaxies (SFGs) are powerful factories of high-energy cosmic rays.\nTheir star formation rate (SFR) is a key physical property characterizing both the total energy budget and the transport conditions of such particle populations. Tight correlations are in fact observed between the SFR and the non-thermal radio and gamma-ray luminosity of several SFGs. I will discuss the nature of such correlations focusing on the physical implications on the particle transport.\n \nThe most active SFGs are known as starburst galaxies (SBGs). These objects are unique environments for cosmic rays since they might be able to confine most of their injected particles. Such a calorimetric scenario is of great interest for the production of hadronic byproducts such as non-thermal radiation and high-energy neutrinos.\nI will illustrate the main features and the impact of calorimetry on the spectral energy distribution of these galaxies.\nIn addition\, since SBGs are also inferred to be highly numerous at cosmological distances\, I will discuss their possible contribution to the diffuse fluxes of gamma rays and neutrinos observed by Fermi-LAT and IceCube respectively.\n \nDespite of the extreme conditions expected to be found in the interstellar medium of SBGs\, accelerators of sub-galactic scale\nsuch as supernova remnants or star clusters are unlikely to overcome the PeV range.  \nOn the other hand\, the enhanced rate of supernovae characterizing SBGs can launch powerful winds with bubble structures where particles can be efficiently accelerated at higher energies.\nI will discuss a physical model describing particle acceleration and transport in these galactic wind bubbles.\nFinally\, I will conclude presenting the multi-messenger potential of SBGs and their wind bubbles in terms of gamma rays\, neutrinos and escaping cosmic rays.
URL:https://www.lapth.cnrs.fr/en/event/star-forming-galaxies-as-cosmic-ray-factories-a-multimessenger-view/
CATEGORIES:Weekly seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20220621T110000
DTEND;TZID=Europe/Paris:20220621T120000
DTSTAMP:20260407T090452
CREATED:20220620T162950Z
LAST-MODIFIED:20220620T163036Z
UID:7799-1655809200-1655812800@www.lapth.cnrs.fr
SUMMARY:[Journal Club] Bootstrapping Pions at Large N
DESCRIPTION:Abstract:  For this journal club meeting I will comment on a recent paper by Albert and Rastelli (https://arxiv.org/abs/2203.11950) in which they apply modern S-matrix bootstrap techniques to the old problem of solving QCD in the large N limit. In particular\, they derive universal bounds for the EFT of massless pions and find that the allowed region for large N theories compatible with unitarity\, causality and analiticity of the S-matrix exhibits a sharp kink\, suggesting the possibility that large N QCD might sit on it in a similar way as the 3D Ising model.\nFinally\, I will make some remarks on the similitudes and differences between this case and that of obtaining bounds for the gravitational S-matrix\, and on the difficulties in extending this ideas to the latter. \n 
URL:https://www.lapth.cnrs.fr/en/event/journal-club-bootstrapping-pions-at-large-n/
CATEGORIES:Upcoming Journal Club
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20220616T110000
DTEND;TZID=Europe/Paris:20220616T120000
DTSTAMP:20260407T090452
CREATED:20220620T163002Z
LAST-MODIFIED:20220620T163002Z
UID:7828-1655377200-1655380800@www.lapth.cnrs.fr
SUMMARY:Intelligent Explorations of the String Theory Landscape  [Remote talk]
DESCRIPTION:The goal of identifying the Standard Model of particle physics and its extensions within string theory has been one of the principal driving forces in string phenomenology. Recently\, the incorporation of artificial intelligence in string theory and certain theoretical advancements have brought to light unexpected solutions to mathematical hurdles that have so far hindered progress in this direction. In this talk I will focus on model building efforts in the context of the E8 × E8 heterotic string compactified on smooth Calabi-Yau threefolds and discuss several areas in which machine learning is expected to make a difference.
URL:https://www.lapth.cnrs.fr/en/event/intelligent-explorations-of-the-string-theory-landscape-remote-talk/
CATEGORIES:Weekly seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20220614T110000
DTEND;TZID=Europe/Paris:20220614T120000
DTSTAMP:20260407T090452
CREATED:20220620T162949Z
LAST-MODIFIED:20220620T162949Z
UID:7797-1655204400-1655208000@www.lapth.cnrs.fr
SUMMARY:[Journal Club] A novel theoretical approach to $R(D^{(*)})$ through the Dispersive Matrix method
DESCRIPTION:Abstract:  \nThe ratios $R(D^{(*)})$ are defined as the $tau/mu$ ratio of the branching fractions of exclusive semileptonic $B to D^{(*)}$ decays. They are a powerful test of Lepton Flavour Universality\, one of the pillars of the SM\, and are determined by the hadronic Form Factors (FFs) describing the $B to D^{(*)}$ decays. Through the novel Dispersive Matrix (DM) approach\, we describe these FFs without assumptions on their functional dependence on the momentum transfer. The DM method is based on the non-perturbative determination of the dispersive bounds due to unitarity and analyticity\, and allows to determine in a model-independent way the FFs in the full kinematical range\, starting from existing Lattice QCD data which are available only at large momentum transfer. Using the unitarity bands of the FFs\, which are thus independent of the experimental determinations of the differential decay widths\, we compute new fully-theoretical expectations of the anomalies. Our results read $R(D) = 0.296(8)$ and $R(D^*) = 0.275(8)$\, each of which is compatible with the corresponding world average of the measurements at the $sim 1.3 sigma$ level. The origin of the discrepancy between the DM estimates and the HFLAV SM predictions will be also discussed. \n  \nZoom link: \nhttps://cnrs.zoom.us/j/91049381574?pwd=TDZyU3NqT0k4MFk3cUMvc0JuOURCdz09
URL:https://www.lapth.cnrs.fr/en/event/journal-club-a-novel-theoretical-approach-to-rd-through-the-dispersive-matrix-method/
CATEGORIES:Upcoming Journal Club
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20220613T140000
DTEND;TZID=Europe/Paris:20220613T150000
DTSTAMP:20260407T090452
CREATED:20220620T163009Z
LAST-MODIFIED:20220620T163009Z
UID:7854-1655128800-1655132400@www.lapth.cnrs.fr
SUMMARY:Primordial black holes from supercooled first-order phase transition
DESCRIPTION: Cosmological first-order phase transition are said strongly supercooled when the nucleation temperature is much smaller than the critical temperature. They are typical of  potentials which feature nearly scale-invariance\, for which the bounce action decreases only logarithmically with time. The phase transition takes place slowly and the probability distribution of bubble nucleation time is maximally spread. Hubble patches which get percolated later than the average are hotter than the background after reheating and potentially collapse into black holes. We discuss the formation of primordial black hole by supercooled first-order phase transitions and we present two classes of particle physics models predicting such transitions.  
URL:https://www.lapth.cnrs.fr/en/event/primordial-black-holes-from-supercooled-first-order-phase-transition/
CATEGORIES:Weekly seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20220609T110000
DTEND;TZID=Europe/Paris:20220609T120000
DTSTAMP:20260407T090452
CREATED:20220620T163000Z
LAST-MODIFIED:20220620T163000Z
UID:7823-1654772400-1654776000@www.lapth.cnrs.fr
SUMMARY:Higgs alignment and the top quark
DESCRIPTION:In 1976\, S. Weinberg and his student\, E. Gildener (GW)\, proposed\nmulti-Higgs models of electroweak symmetry breaking which are clas-\nsically scale-invariant. If this scale invariance is spontaneously broken\,\nthe Higgs boson is the resulting massless dilaton and\, of all the model’s\nscalars\, its couplings to gauge bosons and fermions are exactly as in\nthe one-Higgs-doublet Standard Model of Weinberg’s 1967 “Model of\nLeptons”. That is\, this Higgs boson is aligned. But\, since the clas-\nsical Higgs potential has an infinitely long flat minimum\, there is no\nfixed mass scale — i.e.\, no fixed VEV — at this level and no concrete\nmeaning to this statement.\nThis scale invariance is explicitly broken by the renormalization\nscale Λ in the one-loop approximation of the Coleman-E. Weinberg\neffective potential\, the Higgs boson boson gets mass\, and its VEV\nv is fixed by its relation to Λ. GW assigned its value to be v =\n2−1/4G−1/2\nF = 246 GeV. Now Higgs alignment means something\, but\nis it preserved in one-loop order\, i.e.\, is it natural? And what about\nhigher orders?\nIn this talk\, I will summarize the above in a two-Higgs-doublet\nmodel of the GW mechanism\, emphasizing the surprisingly low masses\nof the model’s BSM Higgs and the role of the top quark in Higgs\nalignment\, update the important experimental consequences of this\nalignment — stressing the futility of most ATLAS and CMS searches\nfor BSM Higgses\, and preview the extension of these results to two-\nloops.\nThis work was started in 2019 with ́Eric Pilon and extended in 2020\nwith Estia Eichten. The two-loop extension is done with Eichten.
URL:https://www.lapth.cnrs.fr/en/event/higgs-alignment-and-the-top-quark/
CATEGORIES:Weekly seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20220602T110000
DTEND;TZID=Europe/Paris:20220602T120000
DTSTAMP:20260407T090452
CREATED:20220620T163002Z
LAST-MODIFIED:20220620T163002Z
UID:7827-1654167600-1654171200@www.lapth.cnrs.fr
SUMMARY:Imprints of axion-like particles in photon spectra from galaxy clusters
DESCRIPTION:Modulations of X-ray spectra from extragalactic sources might provide a signature of photons converting into axion-like particles (ALPs) when traversing a region with a large-scale magnetic field. A crucial unknown in these searches is the structure of the magnetic field considered. In this talk I discuss the impact of realistic models of the magnetic field on ALP-photon oscillations.
URL:https://www.lapth.cnrs.fr/en/event/imprints-of-axion-like-particles-in-photon-spectra-from-galaxy-clusters/
CATEGORIES:Weekly seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20220531T110000
DTEND;TZID=Europe/Paris:20220531T120000
DTSTAMP:20260407T090452
CREATED:20220620T162949Z
LAST-MODIFIED:20220620T162949Z
UID:7798-1653994800-1653998400@www.lapth.cnrs.fr
SUMMARY:[Journal Club] A fundamental plane relation for the gamma-ray luminosity of pulsars
DESCRIPTION:Abstract: \nhttps://arxiv.org/abs/2203.13276 \nhttps://iopscience.iop.org/article/10.3847/2041-8213/ab3e0a (1904.01765)
URL:https://www.lapth.cnrs.fr/en/event/journal-club-a-fundamental-plane-relation-for-the-gamma-ray-luminosity-of-pulsars/
CATEGORIES:Upcoming Journal Club
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20220524T110000
DTEND;TZID=Europe/Paris:20220524T120000
DTSTAMP:20260407T090452
CREATED:20220620T163004Z
LAST-MODIFIED:20220620T163004Z
UID:7835-1653390000-1653393600@www.lapth.cnrs.fr
SUMMARY:Three-dimensional flux vacua from Type II supergravities
DESCRIPTION:We discuss flux compactifications of Type IIA supergravity on G2 spaces with smeared O2/O6-planes down to three dimensions. We start by presenting the setup of allowed fluxes\, the internal geometry\, the equations of motion and after compactification we achieve N=1 AdS3 vacua with scale that can be parametrically decoupled from the KK modes. The solutions we find are at weak coupling and large volume regime while the moduli are fully stabilized at the classical level. Next\, utilizing the exact equations of motion including varying warp factor and dilaton we evaluate the backreaction of O6-planes. Using the appropriate flux scaling we show that the corrections to the various background fields are subleading when going from smeared to localized sources and we find the distances from the loci where the smeared approximation can be trusted. We discuss the possibility for de Sitter uplift as well as results of similar compactifications in Type IIB on curved internal G2 spaces.
URL:https://www.lapth.cnrs.fr/en/event/three-dimensional-flux-vacua-from-type-ii-supergravities/
CATEGORIES:Weekly seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20220524T104500
DTEND;TZID=Europe/Paris:20220524T110000
DTSTAMP:20260407T090452
CREATED:20220620T163002Z
LAST-MODIFIED:20220620T163002Z
UID:7830-1653389100-1653390000@www.lapth.cnrs.fr
SUMMARY:Presentation stagiaires suite
DESCRIPTION:
URL:https://www.lapth.cnrs.fr/en/event/presentation-stagiaires-suite/
CATEGORIES:Weekly seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20220519T080000
DTEND;TZID=Europe/Paris:20220519T200000
DTSTAMP:20260407T090452
CREATED:20220620T162957Z
LAST-MODIFIED:20220620T162957Z
UID:7815-1652947200-1652990400@www.lapth.cnrs.fr
SUMMARY:AnLy Strings & Fields 2nd in-person Meeting
DESCRIPTION:This is a meeting on topics related to string and field theory\, between members of nearby institutions: \n\n\nIP2I (CNRS\, UCBL)\, Lyon \n\n\nLAPTh (CNRS\, USMB)\, Annecy \n\n\nLPENSL (CNRS\, ENSL)\, Lyon \n\n\nMore information can be found on the AnLy webpage. \nFor this second edition\, the meeting will take place in IP2I\, Lyon\, on the 19/05/22. Talks will happen in room 429 (4th floor) and salle des réunions (3rd floor). \n  \nTravel \nOptions between Lyon and Annecy are train (or train + bus)\, Flixbus\, or car (and car-sharing). \nInformation on how to access the IP2I can be found on this page. \n  \nLunch \nSeveral lunch options are possible close to the IP2I (canteen\, restaurant\, etc.). \n  \nInternet \nEduroam is available at the IP2I. \n 
URL:https://www.lapth.cnrs.fr/en/event/anly-strings-fields-2nd-in-person-meeting/
CATEGORIES:Upcoming Workshops
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20220518T160000
DTEND;TZID=Europe/Paris:20220518T170000
DTSTAMP:20260407T090452
CREATED:20220620T163002Z
LAST-MODIFIED:20220620T163002Z
UID:7829-1652889600-1652893200@www.lapth.cnrs.fr
SUMMARY:The Tadpole Problem [Remote talk]
DESCRIPTION:I will discuss string theory compactifications where a large number of moduli is stabilized by fluxes. I will first present a conjecture which rules out the stabilization of all complex-structure moduli in F-theory at a generic point in moduli space by fluxes that satisfy the tadpole cancellation condition. Evidence for this conjecture comes from studying K3xK3 compactifications using evolutionary algorithms.  \nSubsequently\, I will discuss obstructions on flux compactifications coming from AdS/CFT holography. Here\, I will argue that it is not possible to obtain KKLT-like AdS vacua with very small cosmological constants by putting a bound on the central charge of the dual theory. These results have important consequences for the construction of de Sitter vacua in string theory.
URL:https://www.lapth.cnrs.fr/en/event/the-tadpole-problem-remote-talk/
CATEGORIES:Weekly seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20220512T110000
DTEND;TZID=Europe/Paris:20220512T120000
DTSTAMP:20260407T090452
CREATED:20220620T163009Z
LAST-MODIFIED:20220620T163009Z
UID:7853-1652353200-1652356800@www.lapth.cnrs.fr
SUMMARY:CMB\, LSS and the distance ladder: cosmic discordance? [Remote talk]
DESCRIPTION:The Lambda-cold-dark-matter (LCDM) model has established itself as a fantastic (yet parametric)  concordance model able to adjust a wide variety of cosmological observables — CMB\, BBN\, Large Scale Structure (LSS) & SN1a most notably.  However as the precision of the data has increased over the past few years\, a number of predictions of the LCDM model are challenged by recent observations.\nFirst and foremost\, the infamous ‘Hubble tension’ is a strong mismatch between the value of the Hubble constant measured using the classical distance ladder method and that inferred from the ΛCDM model. Second\, the ‘S8 tension’ is a longstanding discrepancy between the determination of the amplitude of matter fluctuations on a 8 Mpc/h scale by galaxy (weak lensing) surveys and its prediction within the LCDM model.  \nAfter a brief review of the various measurements (and some potential short-comings)\, I will discuss potential implications that such measurements could have. I will argue that current data favor the possibility that our Universe has undergone anomalous expansion just before recombination and present an overview of the most promising models (early dark energy\, additional dark radiation component and new neutrino properties)\, and their current limitations. I will present guidelines to resolve these tensions simultaneously and suggest what it might take to establish a new `concordance model’ beyond LCDM.
URL:https://www.lapth.cnrs.fr/en/event/cmb-lss-and-the-distance-ladder-cosmic-discordance-remote-talk/
CATEGORIES:Weekly seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20220510T110000
DTEND;TZID=Europe/Paris:20220510T120000
DTSTAMP:20260407T090452
CREATED:20220620T162951Z
LAST-MODIFIED:20220620T162951Z
UID:7801-1652180400-1652184000@www.lapth.cnrs.fr
SUMMARY:[Journal Club] Absorption or Emission of Solitons
DESCRIPTION:Abstract: \n 
URL:https://www.lapth.cnrs.fr/en/event/journal-club-absorption-or-emission-of-solitons/
CATEGORIES:Upcoming Journal Club
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20220503T110000
DTEND;TZID=Europe/Paris:20220503T120000
DTSTAMP:20260407T090452
CREATED:20220620T162948Z
LAST-MODIFIED:20220620T162948Z
UID:7795-1651575600-1651579200@www.lapth.cnrs.fr
SUMMARY:[Journal Club] Right-handed neutrinos\, TeV scale BSM neutral Higgs boson\, and FIMP dark matter in an EFT framework
DESCRIPTION:Abstract: \nWe consider an effective field theory framework with three Standard Model (SM) gauge singlet right-handed neutrinos and an additional SM gauge singlet scalar field. The framework generates eV masses of light neutrinos via the seesaw mechanism and accommodates a feebly interacting massive particle (FIMP) as a dark matter candidate.  \nTwo of the gauge singlet neutrinos participate in neutrino mass generation\, while the third gauge singlet neutrino is a FIMP dark matter. We explore the correlation between the vev (vacuum expectation value) of the gauge singlet scalar field which translates as the mass of the BSM Higgs\, and the mass of dark matter\, which arises due to the relic density constraint. We perform a collider analysis to explore the discovery prospect of the TeV scale\, BSM Higgs\, through its difatjet signature\, at a future pp collider\, FCC-hh. \n 
URL:https://www.lapth.cnrs.fr/en/event/journal-club-right-handed-neutrinos-tev-scale-bsm-neutral-higgs-boson-and-fimp-dark-matter-in-an-eft-framework/
CATEGORIES:Upcoming Journal Club
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20220421T110000
DTEND;TZID=Europe/Paris:20220421T120000
DTSTAMP:20260407T090452
CREATED:20220620T163003Z
LAST-MODIFIED:20220620T163003Z
UID:7832-1650538800-1650542400@www.lapth.cnrs.fr
SUMMARY:Berry phases\, wormholes and factorization in AdS/CFT [Remote talk]
DESCRIPTION:Within the AdS/CFT correspondence\, the entanglement properties of the\nCFT are related to wormholes in the dual gravity theory. This gives rise\nto questions about the factorisation properties of the Hilbert spaces on\nboth sides of the correspondence.  We review these issues and show how\nthe Berry phase\, a geometrical phase encoding information about\ntopology\, may be used to reveal similarities between the Hilbert space\nstructure  on both sides of the correspondence. Mathematical concepts\nsuch as coadjoint orbits play an important role. In addition to its\nrelevance for quantum gravity\, this analysis also suggests how to\nexperimentally realise the Berry phase and its relation to entanglement\nin table-top experiments involving photons or electrons. This provides a\nnew example for relations between very different branches of physics\nthat follow from the AdS/CFT correspondence and its generalisations.
URL:https://www.lapth.cnrs.fr/en/event/berry-phases-wormholes-and-factorization-in-ads-cft-remote-talk/
CATEGORIES:Weekly seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20220412T110000
DTEND;TZID=Europe/Paris:20220412T120000
DTSTAMP:20260407T090452
CREATED:20220620T162951Z
LAST-MODIFIED:20220620T162951Z
UID:7803-1649761200-1649764800@www.lapth.cnrs.fr
SUMMARY:[Journal Club] About Long-Lived Particles
DESCRIPTION:Abstract: \n  \nZoom link: \nhttps://cnrs.zoom.us/j/91049381574?pwd=TDZyU3NqT0k4MFk3cUMvc0JuOURCdz09
URL:https://www.lapth.cnrs.fr/en/event/journal-club-about-long-lived-particles/
CATEGORIES:Upcoming Journal Club
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20220407T110000
DTEND;TZID=Europe/Paris:20220407T120000
DTSTAMP:20260407T090452
CREATED:20220620T163005Z
LAST-MODIFIED:20220620T163005Z
UID:7836-1649329200-1649332800@www.lapth.cnrs.fr
SUMMARY:Searching for axions in the sky and the lab
DESCRIPTION:Axion is a light particle arising in QCD as a solution to the strong CP problem and is considered to be one of the most promising dark matter candidate with interesting astrophysical and cosmological implications. At first\, I will outline the scheme and sensitivity of a novel radio probe\, axion gegenschein\, in which axion-like particles undergo stimulated decay into photons creating a countersource in a direction opposite to an astrophysical source. In the second part of the talk\, I will describe the design and sensitivity of the cutting-edge axion detector\, the Weakly Interacting Slender Particle detection with LC circuit (WISPLC)\, which will look for axion-like particles in a wide range of masses set to operate in broadband and resonant modes.Axion is a light particle arising in QCD as a solution to the strong CP problem and is considered to be one of the most promising dark matter candidate with interesting astrophysical and cosmological implications. At first\, I will outline the scheme and sensitivity of a novel radio probe\, axion gegenschein\, in which axion-like particles undergo stimulated decay into photons creating a countersource in a direction opposite to an astrophysical source. In the second part of the talk\, I will describe the design and sensitivity of the cutting-edge axion detector\, the Weakly Interacting Slender Particle detection with LC circuit (WISPLC)\, which will look for axion-like particles in a wide range of masses set to operate in broadband and resonant modes.
URL:https://www.lapth.cnrs.fr/en/event/searching-for-axions-in-the-sky-and-the-lab/
CATEGORIES:Weekly seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20220401T103000
DTEND;TZID=Europe/Paris:20220401T113000
DTSTAMP:20260407T090452
CREATED:20220620T163003Z
LAST-MODIFIED:20220620T163003Z
UID:7833-1648809000-1648812600@www.lapth.cnrs.fr
SUMMARY:Precision spectroscopy\, fundamental constants\, and new physics [Colloquium]
DESCRIPTION:High-resolution spectroscopy of the simplest atoms and molecules plays an important role in the determination of fundamental physical constants such as the Rydberg constant or the proton charge radius\, and may also be used to probe for hypothetical interactions beyond the standard model. As an introduction to this topic\, I will review recent work on the hydrogen and muonic hydrogen atoms\, which has led to (at least) partial resolution of the well-known ‘proton radius puzzle’. Then\, I will focus on a new player in the field of fundamental metrology\, namely the hydrogen molecular ion (H2+\, HD+)\, which is studied both experimentally and theoretically in our team.
URL:https://www.lapth.cnrs.fr/en/event/precision-spectroscopy-fundamental-constants-and-new-physics-colloquium/
CATEGORIES:Weekly seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20220331T110000
DTEND;TZID=Europe/Paris:20220331T120000
DTSTAMP:20260407T090452
CREATED:20220620T163005Z
LAST-MODIFIED:20220620T163005Z
UID:7837-1648724400-1648728000@www.lapth.cnrs.fr
SUMMARY:A tale of dark matter production
DESCRIPTION:In this talk\, I will discuss various possibilities of producing dark matter in the early universe. By describing the transition between an inflationary epoch to a late time cosmology\, I will emphasize how the dynamics of the universe can affect dark matter production and leave a cosmological imprint\, allowing some of these scenarios to be constrained.
URL:https://www.lapth.cnrs.fr/en/event/a-tale-of-dark-matter-production/
CATEGORIES:Weekly seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20220329T110000
DTEND;TZID=Europe/Paris:20220329T120000
DTSTAMP:20260407T090452
CREATED:20220620T162951Z
LAST-MODIFIED:20220620T162951Z
UID:7802-1648551600-1648555200@www.lapth.cnrs.fr
SUMMARY:[Journal Club] Hadronic uncertainties in global fits to the Wilson coefficients of b to s transitions
DESCRIPTION:Abstract: \n  \nZoom link: \nhttps://cnrs.zoom.us/j/91049381574?pwd=TDZyU3NqT0k4MFk3cUMvc0JuOURCdz09
URL:https://www.lapth.cnrs.fr/en/event/journal-club-hadronic-uncertainties-in-global-fits-to-the-wilson-coefficients-of-b-to-s-transitions/
CATEGORIES:Upcoming Journal Club
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20220322T110000
DTEND;TZID=Europe/Paris:20220322T120000
DTSTAMP:20260407T090452
CREATED:20220620T163004Z
LAST-MODIFIED:20220620T163004Z
UID:7834-1647946800-1647950400@www.lapth.cnrs.fr
SUMMARY:Quantum Gravity meets Statistical Physics
DESCRIPTION:In this talk\, I will give a description of semi-classical gravity in terms of quantum chaos and statistical physics. I will present the OPE Randomness Hypothesis (ORH)\, a generalization of ETH to CFTs which treats any OPE coefficient involving a heavy operator as a pseudo-random variable with an approximate Gaussian distribution. I will then present some evidence for this conjecture\, based on the size of the non-Gaussianities and on insights from random matrix theory. I will argue that semi-classical gravity describes the true microscopics\, but only statistically. The statistical correlations are geometrized by wormhole geometries\, which explains the factorization puzzle. Time-permitted\, I will show that the non-Gaussianities of the OPE coefficients predict a new connected wormhole geometry that dominates over the genus-2 wormhole.
URL:https://www.lapth.cnrs.fr/en/event/quantum-gravity-meets-statistical-physics/
CATEGORIES:Weekly seminars
END:VEVENT
END:VCALENDAR