Pantheon SEMPARIS Le serveur des séminaires parisiens Paris

The SEMPARIS seminar webserver hosts annoucements of all seminars taking place in Paris area, in all topics of physics, mathematics and computer science. It allows registered users to receive a selection of announcements by email on a daily or weekly basis, and offers the possibility to archive PDF or Powerpoint files, making it available to the scientific community.   [ More information ]


Upcoming Seminars at LPTHE
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Thursday 28 March 2024, 10:00 at IHP, 314 RENC-THEO (Rencontres Théoriciennes) hep-th
Enrico Olivucci Multi-point multi-loop Null Polygons from Fishnet theory to N=4 SYM
Abstract: ``Null polygons" in N=4 SYM theory capture the UV behaviour of a planar multi- point correlator of local operators inserted at the vertices of a light-like polygon. The leading UV divergences of null polygons satisfy a hierarchy of coupled Toda field theory equations according to a recent conjecture [E.O., Vieira ’22]. I will present some progress towards the prediction of Null Polygons beyond leading logarithm via the hexagons technique, appropriately truncated in the light-cone regime. The method, still conjectural, relies on a series of weak- coupling derivations performed in the Fishnet limit of the theory, where the hexagon representation is achieved in the basis of the excitations of a conformal Heisenberg magnet in the principal series. I will present a series of worked-out examples of this method for 6-point correlators at a few loop orders.

Thursday 28 March 2024, 11:45 at IHP, Grisvard RENC-THEO (Rencontres Théoriciennes) hep-th
Evgeny Skvortsov ( Mons University ) Higher spin physics
Abstract: I will review two aspects in which higher spin fields play an important role. Firstly, higher spin states seem to be inevitable in models of quantum gravity, e.g. within AdS/CFT correspondence and in string theory. One of the simplest examples relates theories with massless higher-spin fields, known as higher spin gravities, to (Chern-Simons) vector models that describe many second order phase transitions in the real world and were conjectured to exhibit a number of dualities, including the 3d bosonization duality. I will review the progress towards constructing exact models of AdS/CFT along these lines and how higher spin symmetry is manifested on the CFT side and can be used to prove the 3d bosonization duality. Secondly, any massive and rotating compact object, e.g. a black hole, can be modelled by a higher spin particle. I will review the recent progress in constructing theories with massive higher spin fields with applications to the description of gravitational wave radiation from compact binaries.

Friday 29 March 2024, 14:00 at LPTHE, Library and Zoom (link in the comments)
( https://cern.zoom.us/j/63031219326?pwd=STlDY2l0UTZOTWd3Ty8zaWVQSzNTdz09 )
LPTHE-PPH (Particle Physics at LPTHE) hep-ph
Vo Hong Minh Phan ( LERMA, Observatoire de Paris and Sorbonne U ) Phenomenology of Galactic cosmic-ray transport
Abstract: Despite the important role of cosmic rays in the Galactic interstellar medium, the origin of these particles is still not unambiguously identified. Supernova remnants have long been considered as the most potential class of sources for Galactic cosmic rays. This hypothesis is commonly known as the supernova remnant paradigm. There exist many arguments supporting this paradigm. Some limitations however still persists especially in the MeV and PeV energy ranges, the two energy frontiers of Galactic cosmic rays. Understading the transport of these particles on Galactic scales is, in fact, the key in verifying or falsifying the supernova remnant paradigm. In this talk, I will provide a brief summary of our current understanding on Galactic cosmic-ray transport and its potential implications for the supernova remnant paradigm.

Tuesday 2 April 2024, 14:00 at LPTHE, Library and Zoom (link in the comments)
( https://cern.zoom.us/j/63031219326?pwd=STlDY2l0UTZOTWd3Ty8zaWVQSzNTdz09 )
LPTHE-PPH (Particle Physics at LPTHE) hep-ph
Lucien Heurtier ( King’s College London ) Unveiling Cosmic History with Mini Primordial Black Hole Archeology
Abstract: Light primordial black holes - formed shortly after the end of cosmic inflation - contain crucial information regarding the evolution of the early Universe. Depending on their masses and spins, these black holes can evaporate via Hawking radiation at different times throughout cosmic history, leaving all sorts of traces in cosmological data that may become measurable soon. In this talk, I will introduce general aspects of primordial black hole phenomenology and discuss how one can search for imprints of their early evaporation using cosmic microwave background measurements, large-scale structure surveys, dark-matter direct detection, or gravitational wave observatories.

Friday 5 April 2024, 14:00 at LPTHE, Library and Zoom (link in the comments)
( https://cern.zoom.us/j/63031219326?pwd=STlDY2l0UTZOTWd3Ty8zaWVQSzNTdz09 )
LPTHE-PPH (Particle Physics at LPTHE) hep-ph
Sebastian Hoof ( Padova University ) Finding Axions in a Universe of Data and Envisioning Their Use as Multi-Messenger Probes
Abstract: An ever-growing number of experiments is exploring the remaining axion parameter space, with the exciting prospect of discovering theoretically preferred QCD axion models. This talk discusses how the resulting wealth of data can be leveraged to study axion models and parameters, focussing on my contributions to both the model landscape and phenomenology. Using modern statistical analysis techniques, we can extract the maximal amount of information from the data and learn about axion parameters and their UV structure. I will also entertain the prospects of an axion discovery, which would open up the possibility of using axions as multi-messenger probes. At the example of solar axions, I will demonstrate the points above: how the next generation of helioscopes could potentially discover axions, determine all related model parameters and UV structure, as well as study solar properties such as solar metallicity, macroscopic B-field or temperature profiles. I will conclude by commenting on complementary approaches and related ideas.

Thursday 23 May 2024, 11:00 at LPTHE, bibliothèque du LPTHE, tour 13-14, 4eme étage SEM-DARBOUX (Séminaire Darboux - physique théorique et mathématiques) hep-th|math.DG
Eleanora Di Nezza ( IMJ ) TBA

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