Speaker: Shunsuke Neda (ICRR, Univ. of Tokyo) Venue & Time: Red Room / 15:00 Title: Primordial black holes from Q-balls Abstract:  We discuss primordial black holes (PBHs) originating from Q-balls, which are non-topological solitons arising in complex scalar field theories with a global U(1) symmetry. Depending on the cosmic expansion history, Q-balls can source PBH formation in […]

Gravity, Supergravity and Superstrings (GRASS) Seminar Speaker: David Pereñiguez (Johns Hopkins U.) Title: 'Gravitational Duality at the Lightring, QNM isospectrality, and Ringdown Nonlinearities from Penrose Limits' Abstract: At high frequencies, the physics near a black hole’s lightring can be captured by Penrose-limit plane waves adapted to the photon sphere. In this talk, I will solve […]

Title: 'Sub-PeV gamma-ray astronomy and its physics' Venue&Time: Red Room / 15:00 Abstract: This talk will focus on the physics that can be explored with sub-PeV gamma-ray astronomy (E > 10^14 eV), particularly on the Galactic diffuse gamma rays and the dark matter. Also, our project called ALPACA, which aims systematic sub-PeV gamma-ray observations in […]

Title: 'The tensions of LCDM: An update of observations and theoretical implications' Speaker: Leandros Perivolaropoulos (Ioannina) Venue&Time: Red Room / 15:00 Abstract: The standard LCDM cosmological model, despite its success in describing the large-scale structure of the Universe, is currently challenged by statistically significant discrepancies between early and late-universe observations. In this talk, I provide […]