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
[ scheduler view ]

Thursday 3 December 2020, 15:00 at IHP, Zoom
( The zoom link will be posted here one hour before the talk. )
RENC-THEO (Rencontres Théoriciennes) hep-th
Justin Kaidi ( Simons Center for Geometry snd Physics ) Adventures in Non-Supersymmetric String Theory
Abstract: It has long been known that there exist strings with supersymmetry on the world sheet, but not in spacetime. These include the well-known Type 0 strings, as well as a series of seven heterotic strings, all of which are obtained by imposing unconventional GSO projections. Besides these classic examples though, relatively little is known about the full space of non-SUSY theories. One of the reasons why non-SUSY strings have remained understudied is the fact that nearly all of them have closed string tachyons, and hence do not admit ten-dimensional flat space as a stable vacuum. The goal of this talk is two-fold. First, using recent advances in condensed matter theory, we will reinterpret GSO projections in terms of topological phases of matter, thereby providing a framework for the classification of non-SUSY strings. Having done so, we will show that for all non-SUSY theories in which a tachyon exists, it can be condensed to give a stable lower-dimensional vacuum. In many cases, these stable vacua will be two-dimensional string theories already known in the literature.

Tuesday 8 December 2020, 16:00 at IHP, Seminar via zoom P^3 (Particle Physics in Paris) astro-ph|hep-ph|hep-th
Kaustubh Agashe ( University of Maryland ) Is the Higgs boson composite?
Abstract: In the Standard Model of particle physics, a condensate of the Higgs boson determines the range of the weak nuclear force. However, one finds that quantum corrections generically shift this range to a much smaller value than what is observed. This "hierarchy problem'' can be solved by postulating that the Higgs boson is a composite particle, made up of constituents which are tightly bound by a new force. Such a framework necessitates that the closely related top quark is also composite. After briefly discussing the modeling of such a mechanism, I will describe in more detail how we can test this idea in a wide variety of experiments. These signals of Higgs/top compositeness include direct production of the associated new, heavy composite particles at the LHC, as well as modifications of the properties of the Higgs boson and the top quark themselves due to their composite nature. In this model, the idea of grand unification of the fundamental forces works very well and also naturally leads to an exotic particle that may be the dark matter of the universe. Such ambient dark matter can be detected and also produced at colliders in distinctive ways. I will highlight how some of this phenomenological work has triggered the development of novel experimental strategies, which have subsequently found applicability even beyond testing this framework. Time permitting, I will also briefly discuss the cosmological transition from the phase where the relevant degrees of freedom are the constituents of the Higgs boson to the one with bound states.

Tuesday 12 January 2021, 17:00 at IHP, Seminar via zoom P^3 (Particle Physics in Paris) hep-th
John Terning ( UC Davis ) TBA

Thursday 21 January 2021, 11:00 at IHP, (video) RENC-THEO (Rencontres Théoriciennes) hep-th
Rajesh Gopakumar ( ICTS Bangalore ) TBA

Tuesday 26 January 2021, 16:00 at IHP, Seminar via zoom P^3 (Particle Physics in Paris) astro-ph|hep-ph
Pedro Machado ( Fermilab ) New ideas and opportunities at future liquid argon neutrino experiment
Abstract: In this talk I will highlight some special experimental capabilities of future liquid argon time projection chamber (LArTPCs) neutrino experiments like the Fermilab’s Short Baseline Neutrino Program and DUNE. I will give a broad overview of what could be gained with these capabilities. Then, I will provide concrete physics opportunities that are enabled by LArTPCs, including measuring the CP violation phase with atmospheric neutrinos, searching for light dark matter, and performing precision electroweak physics measurements.

Thursday 28 January 2021, 11:00 at IHP, (video) RENC-THEO (Rencontres Théoriciennes) hep-th
Eric Perlmutter ( Caltech & IPhT ) TBA

Thursday 4 February 2021, 11:00 at APC, bibliothèque du LPTHE, tour 13-14, 4eme étage SEM-DARBOUX (Séminaire Darboux - physique théorique et mathématiques) hep-th
Johannes Kellendonk ( Institut Camille Jordan, Université Claude Bernard Lyon 1 ) TBA

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