LAPTh

RAQIS 22
2022-08-29 09:00 - 2022-09-02 17:00 (Europe/Paris)
Recent Advances in Quantum Integrable Systems

Newtonian regime in a spherical or hyperbolic universe and consequences for the role of spatial curvature in cosmology
2022-09-08 11:00 - 12:00 (Europe/Paris)
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.
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.
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.

Alpine Strings 2022
2022-10-14 09:00 - 18:30 (Europe/Paris)
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:

Bootstrap

Swampland program and string phenomenology
Supergravity and Exceptional Field Theories

Participating institutions are mainly LPENS (Lyon), IP2I (Lyon), LAPTh (Annecy), CERN (Meyrin), UNIGE (Geneva) and EPFL (Lausanne). Young researchers are particularly encouraged to participate.
A preliminary list of speakers includes:

TBA

Travel
Annecy can be reached by train (SNCF, SBB), bus (including B272, or Flixbus), car (including car-sharing Blablacar).
Detailed information on how to access the LAPTh can be found on this page; in particular, buses connecting the station and the LAPTh are indicated.

Lunch and dinner
There 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.
A pizza dinner will be proposed on the 14th October.

Accomodation
A hotel for the night 13-14th October will be proposed when registering.

Internet
Eduroam is available at LAPTh. Another possibility is to get a guest access when you arrive.

This workshop is funded thanks to the AAP USMB “Bootstrapping the Swampland”. It is part of the AnLy activities.
Local organisers: D. Andriot, P. Tourkine.

News from the Universe: A Trio of Intriguing Developments in Astrophysics and Cosmology
2023-05-09 09:00 - 10:00 UTC | Auditorium (LAPTh)
Speakers: Christopher Eckner (CNRS, LAPTh)
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?
https://indico.in2p3.fr/event/29748/

DM indirect searches with cosmic-ray antiparticles
2023-05-11 09:00 - 10:00 UTC | Auditorium (LAPTh)
Speakers: Pedro de la Torre Luque (Stockholm University)
The 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.
https://indico.in2p3.fr/event/29312/

Entanglement and separability of Rokhsar-Kivelson and resonating valence-bond states
2023-05-16 12:00 - 13:00 UTC | Auditorium (LAPTh)
Speakers: Gilles Parez (CRM, Montréal)
Entanglement and separability are two opposite yet intertwined notions in quantum mechanics. A quantum state is said to be entangled if it is not separable, and vice versa. Quantifying how entangled two subsystems are remains a challenging problem, which has led to important insights in the context of quantum many-body systems. In this talk, I will discuss entanglement and separability of dimer Rokhsar-Kivelson (RK) states and resonating valence-bond (RVB) states. For dimer RK states on general tilable graphs, we prove the exact separability of the reduced density matrix of two or more disconnected subsystems, implying the absence of entanglement between the subsystems. For RVB states, we show separability for disconnected systems up to exponentially small terms in the distance d between the subsystems. We argue that separability does hold in the scaling limit, even for arbitrarily small ratio d/L, where L is the characteristic size of the subsystems. Our results hold irrespective of the underlying graph (which include square and triangular lattices), and hence suggest that separability (up to exponentially small terms) between disjoint regions is a universal feature of RVB states. In the case of adjacent subsystems for the RK states, we derive exact results for the logarithmic negativity in terms of partition functions of the underlying statistical model, and recover the known result for the Rényi-1/2 entropy in the limit of complementary subsystems.
https://indico.in2p3.fr/event/29487/

[AnLy] Gerben Venken
2023-05-17 14:00 - 15:00 UTC | Online seminar
Speakers: Gerben Venken (U. Heidelberg)
Abstract: Link: ZoomAnLy: https://sites.google.com/view/anlystringsandfields
https://indico.in2p3.fr/event/29869/

French Strings Meeting 2023
2023-05-23 10:00 - 2023-05-25 15:00 UTC | LAPTh
This meeting will gather the France-based community working in string and quantum field theory for three days of scientific exchanges on current developments in these research areas. The workshop will take place at LAPTh, Annecy, from Tuesday 23rd May at 2pm till Thursday 25th at around 2pm. The detailed program can be found here. Talks are by invitation. Review talks will be given by:Yifei He (LPENS, Paris)Severin Lüst (L2C, Montpellier)Eric Perlmutter (IPhT, Saclay)Speakers list:Nejc Ceplak (IPhT, Saclay)Yegor Goncharov (IDP, Tours)Nafiz Ishtiaque (IHES, Bures-sur-Yvette)Taro Kimura (IMB, Dijon)Bruno Le Floch (LPTHE, Paris)Sucheta Majumdar (LPENS, Lyon)Paul Marconnet (IP2I, Lyon)Blagoje Oblak (CPhT, Palaiseau)Valentin Reys (IPhT, Saclay)Mikel Sanchez-Garitaonandia (CPhT, Palaiseau)George Tringas (LAPTh, Annecy)Alexander Tumanov (LPENS, Paris)This meeting is an activity of IRN:QFS, the International Research Network on Quantum Fields and Strings. Previous editions of similar workshops include:French kick-off meeting of IRN:QFS (Tours, 2021)Théorie des Cordes en France (Paris, 2015) Registration: can be done here. It will close on April 23rd. In case of high attendance, preference will be given to the members of institutes covered by the network IRN:QFS in France. Accommodation: will be covered by the IRN:QFS network for 2 nights (23-25/05), in the limit of 50 participants. The hotel is Best Western International, 19 avenue du Rhône, Annecy. Travel: Annecy can be reached by train (SNCF), bus (Flixbus) or car (including car-sharing Blablacar). Detailed information on how to access the LAPTh can be found on this page. Buses connecting the station and the LAPTh are indicated. Travel costs are to be covered by participants. Lunch and Dinner: Lunches, as well as a workshop dinner, will be offered. Lunches will be provided at LAPTh. The workshop dinner will take place at the Brasserie de l’Impérial. To reach the dinner restaurant as a group, we will leave LAPTh and catch the Bus 1 at Campus, stop at Montremont and walk along Avenue de France. Organizing Committee: David Andriot, Benjamin Basso, Xavier Bekaert, Dmitrii Chicherin, Laurent Gallot, Ruben Minasian, Boris Pioline, Andrea Puhm, Henning Samtleben, Piotr Tourkine. Funding: IRN:QFS, LAPTh, FRIF, CPTGA
https://indico.in2p3.fr/event/28620/

[Journal Club] Pasquale Serpico
2023-05-30 09:00 - 10:00 UTC | Petit Amphi (LAPTh)
Speakers: Pasquale Serpico (LAPTh, Annecy-le-vieux)
Abstract:
https://indico.in2p3.fr/event/29749/

[AnLy] Solving 3d Gravity with Virasoro TQFT
2023-05-31 14:00 - 15:00 UTC | Online seminar
Speakers: Lorenz Eberhardt (Princeton, IAS)
Abstract: I will explain a proposal which relates three-dimensional quantum gravity in AdS3 to a particular 3d TQFT that we refer to as “Virasoro TQFT’’. This relation gives a precise meaning to the standard folklore that pure 3d gravity is related to two copies of SL(2,R) Chern-Simons theory. I will discuss that replacing SL(2,R) Chern-Simons theory by Virasoro TQFT solves several known problems in the correspondence. The relation provides a computationally useful tool to study partition functions of 3d gravity. The talk is based on work with Scott Collier and Mengyang Zhang.Link: ZoomAnLy: https://sites.google.com/view/anlystringsandfields
https://indico.in2p3.fr/event/30080/

Sreemanti Chakraborti
2023-06-01 09:00 - 10:00 UTC | Auditorium (LAPTh)
https://indico.in2p3.fr/event/29661/

Physics at TeV Colliders and Beyond the Standard Model | PhysTeV 2023
2023-06-12 13:00 - 2023-06-30 16:00 UTC | Ecole de Physique des Houches
The “PhysTeV” series of workshops aims at pushing the frontier of fundamental Physics by bringing together theorists and experimentalists working on several aspects of phenomenology at TeV colliders and other experiments.World experts are brought together to address fundamental problems raised notably by the Higgs boson discovery, dark matter and the disappearance of antimatter in the Universe, and to develop new techniques and original strategies to discover signals of new Physics at TeV-scale particle colliders and other experiments, as, for instance, precision low-energy experiments.The main theme of the 2023 edition will be “Intensify the search for new Physics”.Further details available also here: https://phystev.cnrs.fr/Registration will close on 26 March 2023. Registration deadline: extended until 2 April 2023.
Session 1: 12 – 21 June 2023
Higgs Physics (SM aspects)
Theory
Experiment
S. Jones, IPPP, Durham University, UK
R. Röntsch, University of Milan, Italy
M. Donegà, ETH Zurich, Switzerland [CMS]
K. Köneke, University of Freiburg, Germany [ATLAS]
Standard Model Phenomenology
Theory
Experiment
Techniques, calculations, and phenomenology
A. Huss, CERN, Switzerland
M. Pellen, University of Freiburg, Germany
P. Azzurri, INFN Pisa, Italy [CMS]
J. Huston, Michigan State University, USA​ [ATLAS]
Jet substructure techniques
S. Marzani, University of Genova, Italy
A. Hinzmann, University of Hamburg, Germany [CMS]
Monte Carlo generators, Tools, Machine-Learning
Theory
Experiment
S. Höche, FNAL, USA
S. Plätzer, University of Vienna and Graz, Austria
MC: J. McFayden, University of Sussex, UK [ATLAS]
ML: V. Mikuni, NERSC, Berkeley, USA

Session 2: 21 – 30 June 2023
Higgs Physics (BSM aspects)
Theory
Experiment
R.T. D’Agnolo, IPhT Saclay, France
A. De Wit, University of Zurich, Switzerland [CMS]
BSM Phenomenology at colliders
Theory
Experiment
J. Zupan (TBC), Cincinnati University, USA
T. Vazquez-Schroeder, CERN, Switzerland [ATLAS]
High-precision low-energy probes
Theory
Experiment
E. Fuchs, CERN and University of Hannover, Germany
J. Berengut, University of New South Wales, Australia
TBA
Monte Carlo generators, Tools, Machine-Learning
Theory
Experiment
G. Durieux, CERN, Switzerland
A. Wulzer, University of Padua, Italy
G. Kasieczka, University of Hamburg, Germany [CMS]

https://indico.in2p3.fr/event/28537/

Timm Wrase
2023-06-22 09:00 - 10:00 UTC | Petit Amphi (LAPTh)
https://indico.in2p3.fr/event/29705/

[Journal Club] George Tringas
2023-06-27 09:00 - 10:00 UTC | Petit Amphi (LAPTh)
Speakers: George Tringas
Abstract:
https://indico.in2p3.fr/event/29783/

Julien Barrat
2023-06-29 09:00 - 10:00 UTC | Auditorium (LAPTh)
https://indico.in2p3.fr/event/28967/

Julien Gaboriaud
2023-07-06 09:00 - 10:00 UTC | Auditorium (LAPTh)
https://indico.in2p3.fr/event/29995/

Locality and symmetry for T-Tbar and gravity
2024-03-26 10:00 - 11:00 (Africa/Abidjan) | Auditorium (LAPTh)
Speakers: Ruben Monten (Cern)
Holography appears to be a fundamental property of gravity. However, even in well-established models like AdS/CFT, the compatibility of this principle with the locality properties of the gravitational physics we observe remains to be completely understood. We can make progress in less than four spacetime dimensions by using special properties of the so-called T-Tbar operator in the CFT. I will discuss how the symmetries and preserved integrability structure provide an important handle on the properties of T-Tbar deformed CFTs. On the gravitational side, the relevant physics is that of the boundary modes of the metric, which implement the Brown–Henneaux charges. I will show how this reproduces the T-Tbar deformed field theory result and how similar techniques can be applied to asymptotically flat space to derive, among others, soft theorems for scattering amplitudes.
https://indico.in2p3.fr/event/32400/

[Journal Club] Gravitational Waves from Early Matter Domination
2024-03-28 10:00 - 11:00 (Africa/Abidjan) | Petit Amphi
Speakers: Di Liu
Based on the following:arXiv:2311.12340, arXiv:1904.12879, arXiv:gr-qc/0612013
https://indico.in2p3.fr/event/31459/

[Journal Club] Leonard pair
2024-04-02 09:00 - 10:00 (Africa/Abidjan) | Petit Amphi
Speakers: Nicolas Crampé
I will give the definition of the Leonard pair and itsconnection with the Askey-Wilson algebra.The use of these objects is explained in the context of different areas:integrable systems, centralizer, graph theory and special functions.I will explain generalizations I am interest in.
https://indico.in2p3.fr/event/31460/

Ben Heidenreich -- UMass Amherst
2024-04-03 14:00 - 15:00 (Africa/Abidjan)
Speakers: Cristofero Fraser-Taliente (Oxford U.)
Abstract: Link: ZoomAnLy: https://sites.google.com/view/anlystringsandfields
https://indico.in2p3.fr/event/32490/

$b->smu^+mu^-$ anomalies: New Physics or QCD effects?
2024-04-04 09:00 - 10:00 (Africa/Abidjan) | Petit Amphi (LAPTh)
Speakers: Nico Gubernari (Cambridge U., DAMTP)
Rare $B$ meson decays are powerful probes for testing the Standard Model (SM). Recent measurements of several observables in $bto s mumu$ transitions have revealed tensions with the corresponding SM predictions. These tensions — or anomalies — have a significance above $3sigma$. However, the theoretical predictions in these decays are contaminated by difficult-to-calculate QCD contributions, namely the non-local hadronic matrix elements. Understanding these contributions is of paramount importance to probe the SM and to clarify whether the anomalies are due to New Physics or to underestimated theoretical uncertainties.
https://indico.in2p3.fr/event/32208/

AnLy Meeting in honor of Anamaria Font
2024-04-10 07:00 - 2024-04-11 16:00 (Africa/Abidjan) | Auditorium (LAPTh)
Prof. Anamaria Font (Central University of Venezuela) is a renowned string theorist whose career has recently been recognised thanks to the L’Oréal-UNESCO International Award “For Women in Science” (see here and here). At an early stage of her career (1987-1989), Anamaria has also been a postdoc in LAPTh, Annecy, France. It is thus our pleasure to celebrate Anamaria’s award during a special two-days workshop, on the 10-11th April 2024, in LAPTh. We have a long tradition of scientific interactions with colleagues in Lyon, especially on string theory related topics, recently in the form of the AnLy activities. This workshop will then be a special AnLy Meeting, gathering both Lyon and international colleagues and friends of Anamaria for this award celebration.Participation to this meeting is on invitation. Registration: Please read the following information and have a look at the program before registering here. Please register only if you have been invited to. Registration is open between the 11th Dec. until the 09th Feb. Accomodation: The hotel night (10-11th April) with breakfast can be booked and covered by us for Anamaria guests (not including AnLy or LAPTh members). Please indicate your interest when registering.The place is Hôtel de Bonlieu, located here. It is located at 10 mins walking distance from the Annecy train and bus station. To reach LAPTh from there, the closest bus stop is Palais de Justice: you can take bus line 1 (direction Parc des Glaisins) and stop at Campus. More travel information is given below. Lunches and dinner: Those are offered to all participants. Please indicate your interest when registering.Lunches will be provided at LAPTh. Dinner will take place in Brasserie de l’Impérial. Travel information: Nearby airports are those of Geneva and Lyon. Annecy can also be reached by train (SNCF). From both Geneva airport and train station (Cornavin), you can reach Annecy by train or by bus (272). It takes between 1:30 to 2 hours, and booking can be done on the Swiss website. A faster option (45 mins), although traffic and border dependent, is by car. A last option is Flixbus.From Lyon airport, you would have to take a fast tram to Lyon station (La Part Dieu). From that station, you can take a train to Annecy (between 1:30 to 2 hours). Other options from Lyon are by car (1:30 hour) or again Flixbus.Once at Annecy train and bus station, LAPTh can easily be reached by bus (e.g. with line 1) following these instructions. It takes about 20 mins, and tickets can be bought with cash at the bus driver.More travel information can also be found here. Travel expenses remain to be covered by participants. DISCLAIMER: We have been informed that some registered participants have been contacted via phishing emails about “their booking” (accomodation or travel). Please be careful, this is a scam. City walk: On the 11th April afternoon, a walk in the old city will be organised spontaneously. Organisers: David Andriot, Anamaria Font Funding: LAPTh, CPTGA, Owners of the Annales H. Poincaré (IHP, Swiss Physical Society)
https://indico.in2p3.fr/event/30911/

Utilizing the causal spectrum of gravitational waves: implications for Pulsar Timing Arrays
2024-04-16 09:00 - 10:00 (Africa/Abidjan) | Auditorium Vivargent (LAPTh)
Speakers: Davide Racco (Ethz)
The low-frequency part of a primordial gravitational wave spectrum generated by local physics in a wide class of phenomena (such as a phase transition), is largely fixed by causality, offering a clean window into the early Universe. The physics of low-frequency modes allows to probe in a model-independent way the Hubble rate at the time of GW production, the equation-of-state of the Universe at subsequent times and the presence of free-streaming particles at primordial epochs.I will highlight the importance of these considerations for the GW background recently measured at Pulsar Timing Arrays, where the Standard Model has an unavoidable and distinctive effect on a primordial GW signal.
https://indico.in2p3.fr/event/32452/

Gilberto Tetlalmatzi-Xolocotzi
2024-04-18 09:00 - 10:00 (Africa/Abidjan) | Auditorium Vivargent (LAPTh)
Speakers: Gilberto Tetlalmatzi-Xolocotzi (Universität Siegen)
https://indico.in2p3.fr/event/32169/

RAQIS 24
2024-09-02 07:00 - 2024-09-06 15:00 (Africa/Abidjan) | LAPTh
Recent Advances in Quantum Integrable Systems
https://indico.in2p3.fr/event/32579/

Maxim Chernodub
2024-10-10 09:00 - 10:00 (Africa/Abidjan) | Auditorium Vivargent (LAPTh)
Speakers: Maxim Chernodub (Institut Denis Poisson (Tours, France))
https://indico.in2p3.fr/event/32564/

Scattering Transforms in astrophysics, application to components separation
2024-11-21 10:00 - 11:00 UTC | Salle des Sommets (LAPTh)
Speakers: Erwan Allys (LPENS Paris)
New statistical descriptions related to the so-called Scattering Transform recently obtained attractive results for several astrophysical applications. These statistics share ideas with convolutional neural networks, but do not require to be learned, allowing for very efficient characterization of non-Gaussian processes from a very small amount of data. In this talk, I will introduce these statistical descriptions, and give an overview of the different results they allowed to obtain recently. I will focus on ongoing works on non-Gaussian modeling and component separation directly from observational data, in the scientific context of CMB B-mode detection beyond Galactic foregrounds.
https://indico.in2p3.fr/event/34021/

Analyticity, Unitarity, Crossing: An Introduction
2024-11-21 12:00 - 2024-11-26 14:30 UTC | Grande Galérie (LAPTh)
Speakers: Diego Guadagnoli (LAPTh Annecy), Ludovico Vittorio (LAPTh, Université Savoie Mont-Blanc and CNRS, Annecy, France)
Teacher: Balasubramanian Ananthanarayan (Anant), Bangalore, Indian Inst. Sci.
Language: English
Summary
The course is placed at the interface between particle physics and mathematical physics. It is addressed to PhD-level students, and aims at introducing, in a self-contained way, fundamental concepts about scattering amplitudes and boot-straps, as well as about effective theories. Such concepts are key to constrain and improve theories.
Content
The course, already given in 2024 at EPFL (Lausanne), is focused on scattering theory, dispersion relations, and related areas in field theory. These concepts were established in the 1950s and are crucial for understanding locality and causality in physics.
The course aims to systematically build up from first principles, and covers key topics including: • pion-pion scattering, • form-factor analysis, • extension to pion-kaon scattering, • principles of rescattering and (if time permits) three-body final-state effects, • the Roy equations for pion scattering, • the Froissart bound, • introduction to Regge theory.
Extensive literature beyond the course notes will be provided during the course.
Structure
8 lectures (16 hours in total)
· The detailed plan will be fixed according to the preferences of the participants — particularly those coming from outside Annecy. One possibility is to have 2+2 hours on Thu, Fri, Mon, Tue, so that participants can travel to Annecy on Thu morning, spend the weekend in Annecy 😉 and leave on Tue afternoon.
· The second half of lectures may be tutorial sessions depending on the audience’s preference. In this case, the time will be devoted to solving problems either on the blackboard or on a Mathematica-based teaching platform.
· Course foreseen to be in-presence only (no remote participation) to maximize teacher-students interaction.
Keywords
Pion scattering, Roy equations, form factors, dispersion relations
Prerequisites
Basic field theory, particle physics, calculus
https://indico.in2p3.fr/event/33894/

Jakob Moritz - De Sitter candidates in string theory
2024-11-27 15:00 - 16:00 UTC
Speakers: Jakob Moritz (CERN)
.
Abstract: The simplest cosmology compatible with the accelerated expansion of our universe is de Sitter space. Yet, more than 25 years after the discovery of “dark energy’’, concrete de Sitter vacua of string theory have remained elusive. In this talk I will present the first fully concrete string compactifications that yield, at leading order in the string loop and α’α’ expansions, de Sitter vacua of a form envisioned by Kachru, Kallosh, Linde and Trivedi (KKLT) more than 20 years ago. I will begin by reviewing the KKLT proposal and its complex set of delicately balanced ingredients. Then, I will show how all the required features come together in actual examples: I will define explicit Calabi-Yau orientifolds and choices of quantized fluxes, and derive the corresponding four-dimensional effective supergravity theories. Each example includes a strongly warped “Klebanov-Strassler throat” region containing a single anti-D3-brane, whose supersymmetry-breaking energy, computed at leading order in α′, causes an uplift to a metastable de Sitter vacuum in which all moduli are stabilized. I will conclude by emphasizing a set of outstanding computational problems that need to be overcome in order to determine whether these vacua survive (presently unknown) subleading corrections, and thus promote to full solutions of string theory.
Link: Zoom
AnLy: https://sites.google.com/view/anlystringsandfields

https://indico.in2p3.fr/event/34412/

Positivity Constraints for condensed matter and cosmology
2024-11-28 10:00 - 11:00 UTC | Auditorium Vivargent (CNRS Annecy)
Speakers: Paolo Creminelli (ICTP, Trieste)
The coefficients of the operators of an effective field theory (EFT) are constrained to satisfy certain inequalities, under the (mild) assumption that the UV completion satisfies general requirements of causality and unitarity. I discuss the extension of these ideas to theories where the Lorentz symmetry is spontaneously broken, as it happens in cosmology and condensed matter physics. I explain why the use of the S-Matrix run into immediate problems. Constraints can be derived using dispersive arguments for the 2-point function of conserved currents. As a concrete application I will discuss general bounds on the electromagnetic properties of media.
https://indico.in2p3.fr/event/34182/
