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BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20220106T110000
DTEND;TZID=Europe/Paris:20220106T120000
DTSTAMP:20260413T014406
CREATED:20220620T163007Z
LAST-MODIFIED:20220620T163007Z
UID:7845-1641466800-1641470400@www.lapth.cnrs.fr
SUMMARY:Non-deformation quantisation of integrable systems
DESCRIPTION:We will present a new approach to the problem of quantising integrable systems of differential-difference equations. The main idea is to lift these systems to systems defined on free associative algebras and look for the ideals there  that are stabilized by the dynamics of the lifted systems. In a reasonable class of candidate ideals\, there are typically very few that are invariant for the first equation in the integrable hierarchy. Once these ideals are picked the challenge is to prove that the whole hierarchy preserves them. We will discuss these ideas using as a key example the hierarchy of the Bogoyavlensky equation. This is a joint work with A. Mikhailov (Leeds) and J. P. Wang (U. of Kent). It is soon to be published but one can already find an introduction here : arXiv:2009.01838\n 
URL:https://www.lapth.cnrs.fr/en/event/non-deformation-quantisation-of-integrable-systems/
CATEGORIES:Weekly seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20220111T110000
DTEND;TZID=Europe/Paris:20220111T120000
DTSTAMP:20260413T014406
CREATED:20220620T162952Z
LAST-MODIFIED:20220620T162952Z
UID:7805-1641898800-1641902400@www.lapth.cnrs.fr
SUMMARY:[Journal Club] A new approach to dark matter from the mass-radius diagram of the Universe
DESCRIPTION:Abstract: \n[2112.03755] A new approach to dark matter from the mass-radius diagram of the Universe (arxiv.org) \nZoom link: \nhttps://cnrs.zoom.us/j/91049381574?pwd=TDZyU3NqT0k4MFk3cUMvc0JuOURCdz09
URL:https://www.lapth.cnrs.fr/en/event/journal-club-a-new-approach-to-dark-matter-from-the-mass-radius-diagram-of-the-universe/
CATEGORIES:Upcoming Journal Club
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20220113T110000
DTEND;TZID=Europe/Paris:20220113T120000
DTSTAMP:20260413T014406
CREATED:20220620T163000Z
LAST-MODIFIED:20220620T163000Z
UID:7822-1642071600-1642075200@www.lapth.cnrs.fr
SUMMARY:Self-Organised Localisation
DESCRIPTION: I will describe a new phenomenon in quantum cosmology: self-organised localisation. When the fundamental parameters of a theory are functions of a scalar field subject to large fluctuations during inflation\, quantum phase transitions can act as dynamical attractors. As a result\, the theory parameters are probabilistically localised around the critical value and the Universe finds itself at the edge of a phase transition. We illustrate how self-organised localisation could account for the observed near-criticality of the Higgs self-coupling\, the naturalness of the Higgs mass\, or the smallness of the cosmological constant.
URL:https://www.lapth.cnrs.fr/en/event/self-organised-localisation/
CATEGORIES:Weekly seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20220120T110000
DTEND;TZID=Europe/Paris:20220120T120000
DTSTAMP:20260413T014406
CREATED:20220620T163000Z
LAST-MODIFIED:20220620T163000Z
UID:7821-1642676400-1642680000@www.lapth.cnrs.fr
SUMMARY:Exploring compact binary populations with the Einstein Telescope
DESCRIPTION:The Einstein Telescope (ET)\, a wide-band\, future 3G gravitational wave detector\, is to have expected detection rates of $sim 10^5 – 10^6$ BBH detections and $sim 7 times 10^4$ BNS detections in one year. The coalescence of compact binaries with total mass 20 – 100 $M_{odot}$\, as typical of BH-BH or BH-NS binaries\, will be visible up to redshift $zapprox 20$ and higher\, thus facilitating the understanding of the dark era of the Universe preceding the birth of the first stars. The ET will therefore be a crucial instrument for population studies. We analyzed the compact binaries originating in stars from (i) Pop I and Pop II\, (ii) Pop III\, and (iii) globular clusters\, with single ET using the ET-D design sensitivity for the analysis. We estimate the constraints on the chirp mass\, redshift and merger rate with redshift for these classes of compact object binaries. We conclude that ET as a single instrument is capable of detecting and distinguishing different compact binary populations separated in chirp mass – redshift space. The mass distributions characteristics of such different compact binary populations can also be estimated with single ET. Assuming that sufficient number of binaries will be detected from each of these populations\, we also show  that such populations are distinguishable in the combined bulk detection.
URL:https://www.lapth.cnrs.fr/en/event/exploring-compact-binary-populations-with-the-einstein-telescope/
CATEGORIES:Weekly seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20220125T110000
DTEND;TZID=Europe/Paris:20220125T120000
DTSTAMP:20260413T014406
CREATED:20220620T162955Z
LAST-MODIFIED:20220620T162955Z
UID:7812-1643108400-1643112000@www.lapth.cnrs.fr
SUMMARY:[Journal Club]  Muon g-2 and lepton flavor violation
DESCRIPTION:Abstract: [2004.01200] Vector-Like Leptons and Inert Scalar Triplet: Lepton Flavor Violation\, $g-2$ and Collider Searches (arxiv.org) \n  \nZoom link: \nhttps://cnrs.zoom.us/j/91049381574?pwd=TDZyU3NqT0k4MFk3cUMvc0JuOURCdz09
URL:https://www.lapth.cnrs.fr/en/event/journal-club-muon-g-2-and-lepton-flavor-violation/
CATEGORIES:Upcoming Journal Club
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20220201T110000
DTEND;TZID=Europe/Paris:20220201T120000
DTSTAMP:20260413T014406
CREATED:20220620T162951Z
LAST-MODIFIED:20220620T162951Z
UID:7804-1643713200-1643716800@www.lapth.cnrs.fr
SUMMARY:Entanglement entropy of free fermions on graphs
DESCRIPTION:Abstract: \nThe von Neumann entropy is key quantity in quantum information and in the investigation of many-body models. \nIn this talk\, we will show that tools from algebraic combinatorics and from the study of time and band limiting problems can simplify its computations for systems of free fermions on graphs. 
URL:https://www.lapth.cnrs.fr/en/event/entanglement-entropy-of-free-fermions-on-graphs/
CATEGORIES:Upcoming Journal Club
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20220203T110000
DTEND;TZID=Europe/Paris:20220203T120000
DTSTAMP:20260413T014406
CREATED:20220620T163007Z
LAST-MODIFIED:20220620T163007Z
UID:7844-1643886000-1643889600@www.lapth.cnrs.fr
SUMMARY:Primordial neutrino asymmetry evolution in the early Universe [remote talk]
DESCRIPTION:Contrary to charged lepton degeneracies which are tightly constrained by the measured baryon-to-photon ratio\, the allowed values of the primordial neutrino asymmetries cover a large range. In order to study the evolution of these asymmetries in the early Universe\, one needs to solve a set of quantum kinetic equations that include vacuum mixing effects\, mean-field potentials and collisions (scattering and annihilations with charged leptons and among (anti)neutrinos)\, which represents a genuine numerical challenge. \nIn this talk\, I will present the results of a complete three-flavour calculation with the full collision term (which was always approximated in previous numerical studies) at the epoch of neutrino decoupling\, while laying emphasis on an effective description of neutrino oscillations that corresponds to averaging over the shortest time scale. In addition to reducing the computation time while preserving the accuracy of the results\, this “Adiabatic Transfer of Averaged Oscillations” (ATAO) approximation provides a consistent framework to understand the origin of the so-called synchronous oscillations. Moreover\, it leads to new results\, such as the existence of a regime of faster oscillations when the self-interaction mean-field domination dwindles. \n  \n 
URL:https://www.lapth.cnrs.fr/en/event/primordial-neutrino-asymmetry-evolution-in-the-early-universe-remote-talk/
CATEGORIES:Weekly seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20220208T110000
DTEND;TZID=Europe/Paris:20220208T120000
DTSTAMP:20260413T014406
CREATED:20220620T162948Z
LAST-MODIFIED:20220620T162948Z
UID:7794-1644318000-1644321600@www.lapth.cnrs.fr
SUMMARY:[Journal Club] Bridging the μHz gap in the gravitational-wave landscape with binary resonance
DESCRIPTION:Abstract: \nhttps://arxiv.org/abs/2107.04601 \nZoom link: \nhttps://cnrs.zoom.us/j/91049381574?pwd=TDZyU3NqT0k4MFk3cUMvc0JuOURCdz09
URL:https://www.lapth.cnrs.fr/en/event/journal-club-bridging-the-%ce%bchz-gap-in-the-gravitational-wave-landscape-with-binary-resonance/
CATEGORIES:Upcoming Journal Club
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20220210T110000
DTEND;TZID=Europe/Paris:20220210T120000
DTSTAMP:20260413T014406
CREATED:20220620T163005Z
LAST-MODIFIED:20220620T163005Z
UID:7840-1644490800-1644494400@www.lapth.cnrs.fr
SUMMARY:Renormalisation of integrable sigma-models [remote talk]
DESCRIPTION:Classical integrable sigma-models form an important class of two-dimensional integrable field theories. It is a long standing belief that such models define renormalisable Quantum Field Theories. In this talk\, I will review some recent developments related to this question. For instance\, I will discuss some checks of this conjecture in several examples\, including theories coupling an arbitrary number of Principal Chiral Models together in an integrable way. Based on these examples\, I will comment on the emergence from these results of a common simple structure in the 1-loop RG flow of a very broad class of integrable sigma-models.
URL:https://www.lapth.cnrs.fr/en/event/renormalisation-of-integrable-sigma-models-remote-talk/
CATEGORIES:Weekly seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20220217T110000
DTEND;TZID=Europe/Paris:20220217T120000
DTSTAMP:20260413T014406
CREATED:20220620T163006Z
LAST-MODIFIED:20220620T163006Z
UID:7842-1645095600-1645099200@www.lapth.cnrs.fr
SUMMARY:Feebly-Interacting Particles for flavour and muon g-2 anomalies
DESCRIPTION:Flavourful Feebly-Interacting Particles (FIPs) in the MeV to GeV range have a strong impact on precision frontier observables ranging from rare meson decays to the lepton anomalous magnetic moments. Based on an effective field theory approach “SM+X” along with the HEPfit package to study the effect of FIPs on B to K observables. We present an updated study of the available parameter space and constraints\, focusing on FIP scenarios allowing for a simultaneous fit of both the  g-2 muon and B-physics anomalies. \n 
URL:https://www.lapth.cnrs.fr/en/event/feebly-interacting-particles-for-flavour-and-muon-g-2-anomalies/
CATEGORIES:Weekly seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20220308T110000
DTEND;TZID=Europe/Paris:20220308T120000
DTSTAMP:20260413T014406
CREATED:20220620T162955Z
LAST-MODIFIED:20220620T162955Z
UID:7811-1646737200-1646740800@www.lapth.cnrs.fr
SUMMARY:[Journal Club] Solid partitions of integers from D7 branes
DESCRIPTION:Abstract:
URL:https://www.lapth.cnrs.fr/en/event/journal-club-solid-partitions-of-integers-from-d7-branes/
CATEGORIES:Upcoming Journal Club
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20220310T110000
DTEND;TZID=Europe/Paris:20220310T120000
DTSTAMP:20260413T014406
CREATED:20220620T163005Z
LAST-MODIFIED:20220620T163005Z
UID:7838-1646910000-1646913600@www.lapth.cnrs.fr
SUMMARY:From UV to IR and back [Remote talk]
DESCRIPTION:By considering the photon-graviton scattering amplitude at low-energy including loops from the Standard Model\, I will argue how we can infer constraints on the UV behaviour of the gravitational scattering amplitude. I will also comment on implications to other gauge fields in four and higher dimensions and application to the Weak Gravity Conjecture and connections with causality considerations.
URL:https://www.lapth.cnrs.fr/en/event/from-uv-to-ir-and-back-remote-talk/
CATEGORIES:Weekly seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20220315T110000
DTEND;TZID=Europe/Paris:20220315T120000
DTSTAMP:20260413T014406
CREATED:20220620T162951Z
LAST-MODIFIED:20220620T162951Z
UID:7800-1647342000-1647345600@www.lapth.cnrs.fr
SUMMARY:[Journal Club] Solid partitions of integers from D7 branes - part 2
DESCRIPTION:Abstract:
URL:https://www.lapth.cnrs.fr/en/event/journal-club-solid-partitions-of-integers-from-d7-branes-part-2/
CATEGORIES:Upcoming Journal Club
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20220322T110000
DTEND;TZID=Europe/Paris:20220322T120000
DTSTAMP:20260413T014406
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
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20220329T110000
DTEND;TZID=Europe/Paris:20220329T120000
DTSTAMP:20260413T014406
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:20220331T110000
DTEND;TZID=Europe/Paris:20220331T120000
DTSTAMP:20260413T014406
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:20220401T103000
DTEND;TZID=Europe/Paris:20220401T113000
DTSTAMP:20260413T014406
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:20220407T110000
DTEND;TZID=Europe/Paris:20220407T120000
DTSTAMP:20260413T014406
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:20220412T110000
DTEND;TZID=Europe/Paris:20220412T120000
DTSTAMP:20260413T014406
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:20220421T110000
DTEND;TZID=Europe/Paris:20220421T120000
DTSTAMP:20260413T014406
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:20220503T110000
DTEND;TZID=Europe/Paris:20220503T120000
DTSTAMP:20260413T014406
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:20220510T110000
DTEND;TZID=Europe/Paris:20220510T120000
DTSTAMP:20260413T014406
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:20220512T110000
DTEND;TZID=Europe/Paris:20220512T120000
DTSTAMP:20260413T014406
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:20220518T160000
DTEND;TZID=Europe/Paris:20220518T170000
DTSTAMP:20260413T014406
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:20220519T080000
DTEND;TZID=Europe/Paris:20220519T200000
DTSTAMP:20260413T014406
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
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BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20220524T104500
DTEND;TZID=Europe/Paris:20220524T110000
DTSTAMP:20260413T014406
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
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BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20220524T110000
DTEND;TZID=Europe/Paris:20220524T120000
DTSTAMP:20260413T014406
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
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BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20220531T110000
DTEND;TZID=Europe/Paris:20220531T120000
DTSTAMP:20260413T014406
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
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BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20220602T110000
DTEND;TZID=Europe/Paris:20220602T120000
DTSTAMP:20260413T014406
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
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BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20220609T110000
DTEND;TZID=Europe/Paris:20220609T120000
DTSTAMP:20260413T014406
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
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