3 papers
astro-ph.HE2020
On Spin Dependence of the Fundamental Plane of Black Hole Activity
Caner Unal, Abraham Loeb
The Fundamental Plane (FP) of Black Hole (BH) Activity in galactic nuclei relates X-ray and radio luminosities to BH mass and accretion rate. However, there is a large scatter exhi…
astro-ph.CO2019
Nonlinear perturbations from axion-gauge fields dynamics during inflation
Alexandros Papageorgiou, Marco Peloso, Caner Unal
We study a variant of the Chromo-Natural Inflation (CNI) mechanism in which the inflaton interacts only gravitationally with the CNI fields. Integrating out all the non-dynamical s…
astro-ph.CO2019
The Ineludible non-Gaussianity of the Primordial Black Hole Abundance
V. De Luca, G. Franciolini, A. Kehagias +3
We study the formation of primordial black holes when they are generated by the collapse of large overdensities in the early universe. Since the density contrast is related to the…