370 citations · 823 across the 12 of their papers we have counts for
7 papers · 1 filter
Primordial black holes and their gravitational-wave signatures
Eleni Bagui, Sebastien Clesse, Valerio De Luca +17
In the recent years, primordial black holes (PBHs) have emerged as one of the most interesting and hotly debated topics in cosmology. Among other possibilities, PBHs could explain…
Axion-Gauge Dynamics During Inflation as the Origin of Pulsar Timing Array Signals and Primordial Black Holes
Caner Unal, Alexandros Papageorgiou, Ippei Obata
We demonstrate that the recently announced signal for a stochastic gravitational wave background (SGWB) from pulsar timing array (PTA) observations, if attributed to new physics, i…
Probing ultralight scalar, vector and tensor dark matter with pulsar timing arrays
Caner Unal, Federico R. Urban, Ely D. Kovetz
Pulsar timing arrays (PTAs) are sensitive to oscillations in the gravitational potential along the line-of-sight due to ultralight particle pressure. We calculate the probing power…
Unveiling cosmological information on small scales with line intensity mapping
Sarah Libanore, Caner Unal, Debanjan Sarkar +1
One of the toughest challenges in modern cosmology is to probe the small scales Mpc in the matter power spectrum and clustering. We show that such small scales…
Multi-messenger Probes of Inflationary Fluctuations and Primordial Black Holes
Caner Unal, Ely D. Kovetz, Subodh P. Patil
Next generation cosmic microwave background spectral distortion and pulsar timing array experiments have the potential to probe primordial fluctuations at small scales with remarka…
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…
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…