47 citations · 257 across the 17 of their papers we have counts for
4 papers · 1 filter
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…
Dissipative Emergence of Inflation from Quasi-Cyclic Universe
Hiroki Matsui, Alexandros Papageorgiou, Fuminobu Takahashi +1
Inflationary models, especially those with plateau-type potentials, are consistent with the cosmological data, but inflation itself does not resolve the initial singularity. This s…
Dissipative Genesis of the Inflationary Universe
Hiroki Matsui, Alexandros Papageorgiou, Fuminobu Takahashi +1
We study an inflation model with a flat scalar potential supported by observations and find that slow-roll inflation can emerge after a quasi-cyclic phase of the Universe, where it…
A flashing beacon in axion inflation: recurring bursts of gravitational waves in the strong backreaction regime
Juan Garcia-Bellido, Alexandros Papageorgiou, Marco Peloso +1
The coupling between a pseudo-scalar inflaton and a gauge field leads to an amount of additional density perturbations and gravitational waves (GWs) that is strongly sensitive to t…