SEMPARIS : Le serveur des séminaires parisiens

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 25 February 2021, 11:00 at IHP, Zoom
( https://zoom.us/j/97507124810 pwd 1234 ) RENC-THEO (Rencontres Théoriciennes) hep-th

Yu-Tin Huang ( National Taiwan University ) An EFT/CFT ``Duality": from the modular-hedron to the EFT-hedron

Abstract: In this talk we will show that the space of consistent EFTs and 2D CFTs are governed by the same geometry. For the former, the theory space stems from a four-point S-matrix that is consistent with having a crossing symmetric unitary and Lorentz invariant UV completion, while the latter is deduced from modular invariant torus partition functions. We will show that in both cases, the space is given by a product geometry of convex hull of points on positive moment curves, intersecting with the subplane reflecting crossing/modular symmetry. We will provide evidence that a particular vertex of the intersecting geometry gives the extremal spectrum of the discretize (derivative expansion) bootstrap problem.

Tuesday 2 March 2021, 14:00 at LPTHE, https://zoom.us/j/97404769748 LPTHE-PPH (Particle Physics at LPTHE) hep-ph

Oscar Macias ( U. Amsterdam & IPMU Tokyo ) Searching for evidence of TeV-scale electron/positron acceleration by Millisecond Pulsars

Abstract: Pulsars have long been predicted to be sources of electron/positron (e-e+) pairs. Highly energetic e-e+ in the wind regions, or inner magnetospheres of pulsars, and also when released into the interstellar medium, can inverse-Compton (IC) scatter ambient photons to very high energies. Recent HAWC observations of extended TeV-scale gamma-ray emission around Geminga and Monogem have provided indirect evidence for multi-TeV e-e+ acceleration in young pulsar nebulae. However, predicting and observing high energy gamma-ray emission from rotation-powered millisecond pulsars (MSPs) presents a number of challenges compared to that of the non-recycled pulsar population. During this talk, I will summarize these challenges, and present our recent exciting results where we find evidence for very high energy gamma ray emission from populations of MSPs residing in globular clusters of the Milky Way. I will further highlight the unique capabilities of the Cherenkov Telescope Array to detect the expected IC signal from a putative population of 10 to 50 thousand MSPs in the center of our Galaxy.

Tuesday 13 April 2021, 16:00 at IHP, Seminar via zoom https://ijclab.zoom.us/j/94900481972 P^3 (Particle Physics in Paris) astro-ph|hep-ph|hep-th

Géraldine Servant ( DESY and University of Hamburg ) TBA

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Thursday 25 February 2021, 11:00 at IHP, Zoom ( https://zoom.us/j/97507124810 pwd 1234 )	RENC-THEO (Rencontres Théoriciennes)	hep-th
Yu-Tin Huang ( National Taiwan University )	An EFT/CFT ``Duality": from the modular-hedron to the EFT-hedron
Abstract:	In this talk we will show that the space of consistent EFTs and 2D CFTs are governed by the same geometry. For the former, the theory space stems from a four-point S-matrix that is consistent with having a crossing symmetric unitary and Lorentz invariant UV completion, while the latter is deduced from modular invariant torus partition functions. We will show that in both cases, the space is given by a product geometry of convex hull of points on positive moment curves, intersecting with the subplane reflecting crossing/modular symmetry. We will provide evidence that a particular vertex of the intersecting geometry gives the extremal spectrum of the discretize (derivative expansion) bootstrap problem.

Tuesday 2 March 2021, 14:00 at LPTHE, https://zoom.us/j/97404769748	LPTHE-PPH (Particle Physics at LPTHE)	hep-ph
Oscar Macias ( U. Amsterdam & IPMU Tokyo )	Searching for evidence of TeV-scale electron/positron acceleration by Millisecond Pulsars
Abstract:	Pulsars have long been predicted to be sources of electron/positron (e-e+) pairs. Highly energetic e-e+ in the wind regions, or inner magnetospheres of pulsars, and also when released into the interstellar medium, can inverse-Compton (IC) scatter ambient photons to very high energies. Recent HAWC observations of extended TeV-scale gamma-ray emission around Geminga and Monogem have provided indirect evidence for multi-TeV e-e+ acceleration in young pulsar nebulae. However, predicting and observing high energy gamma-ray emission from rotation-powered millisecond pulsars (MSPs) presents a number of challenges compared to that of the non-recycled pulsar population. During this talk, I will summarize these challenges, and present our recent exciting results where we find evidence for very high energy gamma ray emission from populations of MSPs residing in globular clusters of the Milky Way. I will further highlight the unique capabilities of the Cherenkov Telescope Array to detect the expected IC signal from a putative population of 10 to 50 thousand MSPs in the center of our Galaxy.

Tuesday 13 April 2021, 16:00 at IHP, Seminar via zoom https://ijclab.zoom.us/j/94900481972	P^3 (Particle Physics in Paris)	astro-ph\|hep-ph\|hep-th
Géraldine Servant ( DESY and University of Hamburg )	TBA