13 papers
Thermal Sunyaev-Zel'dovich cross-correlations with unWISE galaxies: disentangling radio contamination, dust properties, and electron pressure
Guandi Zhao, Alex Krolewski, Niayesh Afshordi
Cross-correlations between the thermal Sunyaev-Zel'dovich (tSZ) effect and galaxy surveys provide a sensitive probe of hot gas in low-mass halos, but on the angular scales of great…
Self-regularized entropy: What does black hole entropy predict for tests of Kerr no-hair theorem?
Shokoufe Faraji, Niayesh Afshordi
We compute the canonical, or brick-wall, entropy of a massless scalar field in a quantum black hole model whose strong field exterior is described phenomenologically by the static…
Big Mysteries Survey: Physicists' Views on Cosmology, Black Holes, Quantum Mechanics, and Quantum Gravity
Niayesh Afshordi, Phil Halper, Matteo Rini +1
We present results from the Big Mysteries Survey, a large-scale survey conducted through the American Physical Society's Physics Magazine on foundational and controversial topics i…
Exploring Born-Infeld f(T) teleparallel gravity through accretion disk dynamics
Ruijing Tang, Shokoufe Faraji, Niayesh Afshordi
Teleparallel Born-Infeld gravity (TBI) is a modified theory of gravity that aims to maintain second order field equations, leading to alternative scenarios for strong gravity and c…
Ultraviolet Completion of the Big Bang in Quadratic Gravity
Ruolin Liu, Jerome Quintin, Niayesh Afshordi
We present a quantum quadratic gravity inflationary scenario that can accommodate the new cosmological constraints, which have disfavored Starobinsky inflation. The theory is asymp…
Black hole spectroscopy: from theory to experiment
Emanuele Berti, Vitor Cardoso, Gregorio Carullo +70
The "ringdown" radiation emitted by oscillating black holes has great scientific potential. By carefully predicting the frequencies and amplitudes of black hole quasinormal modes a…