June 5, 2023 Monday 2:00 PM
+
726
Broadway, 940, CCPP Seminar
Other Center for Cosmology and Particle Physics Events
(
ccpp)
Informal HEP Talk
Swapnamay Mondal
DIAS, Dublin
Supersymmetric black holes and Tar{T} deformation
The entropy of supersymmetric black holes in string theory
compactifications can be related to that of a D- or M-brane system, which
in many cases can be further reduced to a two-dimensional conformal field
theory (2d CFT). For black holes in M-theory, this relation involves a
decoupling limit where the black hole mass diverges. We suggest that
moving away from this limit corresponds to a specific irrelevant
perturbation of the 2d CFT, namely the supersymmetric completion of the
Tar{T} deformation. We demonstrate that the black hole mass matches
precisely with the Tar{T} deformed energy levels, upon identifying the
Tar{T} deformation parameter with the inverse of the leading term of the
black hole mass. We discuss various implications of this novel realization
of the Tar{T} deformation, including a Hagedorn temperature for wrapped
M5-branes, and potential change of degeneracies in the deformed theory.
June 9, 2023 Friday 11:00 AM
+
726
Broadway, 940, CCPP Seminar
Other Center for Cosmology and Particle Physics Events
(
ccpp)
Informal Astro Talk
Chris Nagele
Haverford
Supermassive black holes: where do they come from and how do they grow?
Supermassive black holes are thought to be one of the fundamental ingredients in galaxy evolution, yet due to the difficulty of direct observation, basic questions such as the origin and growth of these black holes remain unanswered. A promising explanation for the origin of supermassive black holes is the direct collapse hypothesis, where massive gas clouds in the early universe contract to form supermassive stars which then collapse to black holes and become the seeds for observed supermassive black holes. This scenario is difficult to probe observationally because of the extreme distances involved, but one possibility is the general relativistic supernova of a supermassive star, an event which is luminous enough to be observed at high redshift. I will present numerical models of the evolution, instability and explosion of supermassive stars and discuss prospects for direct and indirect observation with current and future telescopes. I will then describe another recent paper where we attempt to elucidate correlations between active galactic nuclei and the morphology of the host galaxy using a variational autoencoder, a technique from generative modeling. We identify a correlation between host galaxy morphology and AGN activity and thus demonstrate the potential for similar techniques to be applied to larger datasets from future telescopes.
June 14, 2023 Wednesday 2:00 PM
+
726
Broadway, 940, CCPP Seminar
Other Center for Cosmology and Particle Physics Events
(
ccpp)
Special Seminar
Or Graur
University of Portsmouth
Tidal disruption event light echoes in SDSS and DESI spectra
August 15, 2023 Tuesday 11:00 AM
+
726
Broadway, 902, Lg Conf
Other Center for Cosmology and Particle Physics Events
(
ccpp)
Oral Defense
Marc Williamson
TBA
TBA
September 5, 2023 Tuesday 2:00 PM
+
726
Broadway, 940, CCPP Seminar
Astrophysics and Relativity Seminars
(
astro)
Raffaella Margutti
UC Berkeley
To be determined
Fall date to be determined
November 14, 2023 Tuesday 2:00 PM
+
726
Broadway, 1067, CQP Seminar
Center for Quantum Phenomena Seminars
(
cqp)
Roopali Kukreja
UC Davis
TBA
December 12, 2023 Tuesday 12:00 PM
+
726
Broadway, 940, CCPP Seminar
Astrophysics and Relativity Seminars
(
astro)
Foteini Oikonomou
NTNU Norwegian Univ. of Science & Technology (Trondheim)
Multimessenger astronomy with high-energy neutrinos and ultra-high energy cosmic rays
Multi-messenger astrophysics has emerged as a rapidly growing field of research in the last decade, providing unique new insights into the properties of high-energy astrophysical sources. Such insights have been made possible by the complementary information carried by photons, cosmic rays, neutrinos, and gravitational waves about the astrophysical environments and processes in which they are produced. In this talk, I will review recent results in the search for the origin of high-energy neutrinos and ultra-high-energy cosmic rays and the possible role of active galactic nuclei, gamma-ray bursts, and tidal-disruption events as cosmic-ray accelerators based on the latest observations.