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DTSTART:20230101T000000
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BEGIN:VEVENT
DTSTART;TZID=UTC:20241121T100000
DTEND;TZID=UTC:20241121T110000
DTSTAMP:20260404T084435
CREATED:20241125T075900Z
LAST-MODIFIED:20241125T075900Z
UID:8428-1732183200-1732186800@www.lapth.cnrs.fr
SUMMARY:Scattering Transforms in astrophysics\, application to components separation
DESCRIPTION:Speakers: Erwan Allys (LPENS Paris)\nNew 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.\nhttps://indico.in2p3.fr/event/34021/
URL:https://www.lapth.cnrs.fr/event/scattering-transforms-in-astrophysics-application-to-components-separation/
LOCATION:Salle des Sommets (LAPTh)
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BEGIN:VEVENT
DTSTART;TZID=UTC:20241121T120000
DTEND;TZID=UTC:20241126T143000
DTSTAMP:20260404T084435
CREATED:20241125T075955Z
LAST-MODIFIED:20241126T114951Z
UID:8435-1732190400-1732631400@www.lapth.cnrs.fr
SUMMARY:Analyticity\, Unitarity\, Crossing: An Introduction
DESCRIPTION:Speakers: Diego Guadagnoli (LAPTh Annecy)\, Ludovico Vittorio (LAPTh\, Université Savoie Mont-Blanc and CNRS\, Annecy\, France)\nTeacher: Balasubramanian Ananthanarayan (Anant)\, Bangalore\, Indian Inst. Sci.\nLanguage: English\nSummary\nThe 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.\nContent\nThe 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.\nThe 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.\nExtensive literature beyond the course notes will be provided during the course.\nStructure\n8 lectures (16 hours in total)\n·    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.\n·    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.\n·    Course foreseen to be in-presence only (no remote participation) to maximize teacher-students interaction.\nKeywords\nPion scattering\, Roy equations\, form factors\, dispersion relations\nPrerequisites\nBasic field theory\, particle physics\, calculus\nhttps://indico.in2p3.fr/event/33894/
URL:https://www.lapth.cnrs.fr/event/analyticity-unitarity-crossing-an-introduction/
LOCATION:Grande Galérie (LAPTh)
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=UTC:20241127T150000
DTEND;TZID=UTC:20241127T160000
DTSTAMP:20260404T084435
CREATED:20241125T075955Z
LAST-MODIFIED:20241127T144510Z
UID:8436-1732719600-1732723200@www.lapth.cnrs.fr
SUMMARY:Jakob Moritz - De Sitter candidates in string theory
DESCRIPTION:Speakers: Jakob Moritz (CERN)\n.\nAbstract: 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.\nLink: Zoom\nAnLy: https://sites.google.com/view/anlystringsandfields\n \n \nhttps://indico.in2p3.fr/event/34412/
URL:https://www.lapth.cnrs.fr/event/jakob-moritz/
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=UTC:20241128T100000
DTEND;TZID=UTC:20241128T110000
DTSTAMP:20260404T084435
CREATED:20241125T075901Z
LAST-MODIFIED:20241128T102228Z
UID:8430-1732788000-1732791600@www.lapth.cnrs.fr
SUMMARY:Positivity Constraints for condensed matter and cosmology
DESCRIPTION:Speakers: Paolo Creminelli (ICTP\, Trieste)\nThe 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. \nhttps://indico.in2p3.fr/event/34182/
URL:https://www.lapth.cnrs.fr/event/paolo-creminelli/
LOCATION:Auditorium Vivargent (CNRS Annecy)
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