249 citations · 1.3k across the 28 of their papers we have counts for
5 papers · 1 filter
Velocity-dependent interacting dark energy and dark matter with a Lagrangian description of perfect fluids
Jose Beltrán Jiménez, Dario Bettoni, David Figueruelo +2
We consider a cosmological scenario where the dark sector is described by two perfect fluids that interact through a velocity-dependent coupling. This coupling gives rise to an int…
Screening away the tension
Jose Beltran Jimenez, Dario Bettoni, Philippe Brax
This Essay explores consequences of a dark non-linear electromagnetic sector in a Universe with a net dark charge for matter. The cosmological dynamics can be described by a Lemaît…
Chiral gravitational waves and primordial black holes in UV-protected Natural Inflation
Juan P. Beltrán Almeida, Nicolás Bernal, Dario Bettoni +1
We consider an UV-protected Natural Inflation scenario involving Chern-Simons-like interactions between the inflaton and some beyond the Standard Model gauge fields. The accelerate…
On cosmological signatures of baryons-dark energy elastic couplings
Jose Beltrán Jiménez, Dario Bettoni, David Figueruelo +1
We consider a scenario where dark energy and baryons are dynamically coupled without any energy transfer. In this scenario, the background cosmology is unaffected and, at the pertu…
Charged Dark Matter and the tension
Jose Beltrán Jiménez, Dario Bettoni, Philippe Brax
We consider cosmological models where dark matter is charged under a dark Abelian gauge field. This new interaction is repulsive and competes with gravity on large scales and in th…