130 citations · 934 across the 27 of their papers we have counts for
4 papers · 1 filter
Oscillations and parity violation in gravitational wave background from extra tensor modes
Jaume Garriga, Mohammad Ali Gorji, Fazlollah Hajkarim +1
Spectator fields which provide additional tensor degrees of freedom, on top of the standard metric tensor perturbations, can produce significant amounts of gravitational waves (GWs…
Primordial Gravitational Waves from Phase Transitions during Reheating
Amitayus Banik, Nicolás Bernal, Fazlollah Hajkarim
We study primordial gravitational waves (GWs) generated from first-order phase transitions (PTs) during cosmic reheating. Using a minimal particle physics model, and a general para…
Cosmological Bound on the QCD Axion Mass, Redux
Francesco D'Eramo, Eleonora Di Valentino, William Giarè +5
We revisit the joint constraints in the mixed hot dark matter scenario in which both thermally produced QCD axions and relic neutrinos are present. Upon recomputing the cosmologica…
Primordial Gravitational Waves in Nonstandard Cosmologies
Nicolás Bernal, Fazlollah Hajkarim
Assuming that inflation is followed by a phase where the energy density of the Universe is dominated by a component with a general equation of state, we evaluate the spectrum of pr…