23 citations · 26 across the 3 of their papers we have counts for
6 papers
Rectifying No-Hair Theorems in Gauss-Bonnet theory
Alexandros Papageorgiou, Chan Park, Miok Park
We revisit the no-hair theorems in Einstein-Scalar-Gauss-Bonnet theory with a general coupling function between the scalar and the Gauss-Bonnet term in four dimensional spacetime.…
Gravitational Wave Signatures from Warm Dark Energy
Alexandros Papageorgiou
Motivated by some of the recent swampland conjectures, we study a model of dark energy, in which a quintessence axion slowly rolls in a steep potential due to its interactions with…
Warm dark energy
Gianguido Dall'Agata, Sergio Gonzalez-Martin, Alexandros Papageorgiou +1
Motivated by some of the recent swampland conjectures, we study the implementation for the late time acceleration of the Universe of a mechanism developed by Anber and Sorbo in the…
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…
Nonlinear perturbations from the coupling of the inflaton to a non-Abelian gauge field, with a focus on Chromo-Natural Inflation
Alexandros Papageorgiou, Marco Peloso, Caner Unal
Several models of inflation employing a triplet of SU(2) vectors with spatially orthogonal vacuum expectation values (VEVs) have been recently proposed. One (tensor) combination $t…
Gravitational leptogenesis in Natural Inflation
Alexandros Papageorgiou, Marco Peloso
We compute the gravitational leptogenesis generated from the parity-violating gravitational waves sourced by an abelian gauge field coupled to a pseudo-scalar inflation. We show th…