16 citations · 17 across the 15 of their papers we have counts for
13 papers · 1 filter
micrOMEGAs 7: Beyond standard cosmology
G. Belanger, A. Belyaev, N. Bernal +4
We present micrOMEGAs7, a major upgrade of the micrOMEGAs package for the computation of dark matter observables in generic models. This release introduces a generalized treatment…
From Rags to Jeans: Axion Miniclusters from Early matter domination
Ariel Angulo, Paola Arias, Nicolás Bernal +1
In an early matter-dominated era, density and temperature inhomogeneities of the radiation bath grow more efficiently than in the standard radiation-dominated history. If the axion…
Next-to-Minimal Freeze-in Dark Matter
Nicolás Bernal, Sagnik Mukherjee, James Unwin
If the dark matter mass exceeds the highest temperature of the thermal bath, then dark matter production is Boltzmann suppressed. This opens new possibilities for dark matter model…
Strongly interacting singlet scalar dark matter during reheating
Geneviève Bélanger, Nicolás Bernal, Alexander Pukhov
We revisit the singlet scalar dark matter model in the presence of a non-standard cosmological history prior to radiation domination. We focus on the regime in which the relic abun…
Probing Bose-enhanced Inflaton Decay with Gravitational Waves
Nicolás Bernal, Quan-feng Wu, Xun-Jie Xu +1
We investigate cosmic reheating dynamics in the presence of a transient condensate formed by bosonic decay products of the inflaton. We show that the emergence of such a condensate…
Two or three things particle physicists (mis)understand about (pre)heating
Basabendu Barman, Nicolás Bernal, Javier Rubio
The transition from the end of inflation to a hot, thermal Universe, commonly referred to as (re)heating, is a critical yet often misunderstood phase in early Universe cosmology. T…
Pre-thermalized Gravitational Waves
Nicolás Bernal, Quan-feng Wu, Xun-Jie Xu +1
We investigate a novel gravitational wave (GW) production mechanism from gravitons generated during the pre-thermal phase of cosmic reheating, where the energy density is dominated…
Thermal Gravitational Waves During Reheating
Nicolás Bernal, Yong Xu
In this work, we revisit the generation of stochastic gravitational waves (GWs) from interactions in the thermal plasma. We extend the existing literature by incorporating the rehe…
Graviton- and Inflaton-mediated Dark Matter Production after Large Field Polynomial Inflation
Nicolás Bernal, Julia Harz, Martin A. Mojahed +1
Polynomial inflation is a simple cosmological scenario, which fits the cosmic microwave background data well. It provides testable predictions for the tensor-to-scalar ratio and th…
Resonant Reheating
Basabendu Barman, Nicolás Bernal, Yong Xu
We investigate a novel reheating scenario proceeding through -channel inflaton annihilation, mediated by a massive scalar. If the inflaton oscillates around the minimum of a…
Probing Reheating with Graviton Bremsstrahlung
Nicolás Bernal, Simon Cléry, Yann Mambrini +1
We investigate the stochastic gravitational wave (GW) spectrum resulting from graviton bremsstrahlung during inflationary reheating. We focus on an inflaton oscillating around…
Unitarity Bound on Dark Matter in Low-temperature Reheating Scenarios
Nicolás Bernal, Partha Konar, Sudipta Show
Model-independent theoretical upper bound on the thermal dark matter (DM) mass can be derived from the maximum inelastic DM cross-section featuring the whole observed DM abundance.…
Rescuing Gravitational-Reheating in Chaotic Inflation
Basabendu Barman, Nicolás Bernal, Javier Rubio
We show, within the single-field inflationary paradigm, that a linear non-minimal interaction between the inflaton field and the Ricci scalar can result in s…