12 papers
The cosmology of long range Yukawa interactions in general backgrounds
Guillem Dom`enech, Panagiotis Giannadakis
Long-range forces in the early universe may lead to early structure formation and, perhaps, to primordial black holes. We generalise previous studies of fermions coupled to a light…
Observable Gravitational Wave Strain at Second Order
Guillem Domènech, Shi Pi, Ao Wang
There is currently no rigorous definition of gravitational wave strain at second order in cosmological perturbation theory. The usual association of gravitational waves with transv…
Gravitational wave constraints on the Paneitz operator
Robin Valtin, Alexander Ganz, Guillem Domènech
The Paneitz operator is a dimension-4 conformally invariant fourth-order differential operator that has recently attracted attention for possible cancellations of the vacuum energy…
Unique gravitational wave signatures of GLPV scalar-tensor theories
Guillem Domènech, Alexander Ganz, Mohammad Ali Gorji +1
We study gravitational waves induced by scalar primordial fluctuations in Gleyzes-Langlois-Piazza-Vernizzi (GLPV), beyond Horndeski, scalar-tensor theories. We uncover, at the leve…
Gravitational waves induced by matter isocurvature in general cosmologies
Guillem Domènech, Jan Tränkle
The expansion history and content of the Universe between the end of inflation and the onset of Big Bang Nucleosynthesis is mostly unknown. In this paper, we study gravitational wa…
On the adiabatic initial conditions for a particle gas in cosmology
Guillem Domènech
In view of recent interest in the role of "dark" radiation in cosmology, such as cosmic gravitational waves, sterile neutrinos, and dark photons, we clarify the definition of adiab…