6 papers
Noble gravitational atoms: Self-gravitating black hole scalar wigs with angular momentum number
Miguel Alcubierre, Juan Barranco, Argelia Bernal +5
We present new spherically symmetric solutions of the Einstein-Klein-Gordon equations in a quasi-stationary approximation that describe self-gravitating scalar field configurations…
Probing a minimal dark gauge sector via microlensing of compact dark objects
Juan Barranco, Argelia Bernal, VÃctor Jaramillo +2
We introduce a minimal Dark Standard Model (DSM) consisting of a single spin-0 particle with dark gauge symmetry, and completely decoupled from the visible sector. Character…
Dark-to-black super accretion as a mechanism for early supermassive black hole growth
Nicolas Sanchis-Gual, Juan Barranco, Juan Carlos Degollado +1
The discovery of supermassive black holes with masses at redshifts challenges conventional formation scenarios based on baryonic accretion and…
Gravitational atoms beyond the test field limit: The case of Sgr A* and ultralight dark matter
Miguel Alcubierre, Juan Barranco, Argelia Bernal +5
We construct gravitational atoms including self-gravity, obtaining solutions of the Einstein-Klein-Gordon equations for a scalar field surrounding a non-rotating black hole in a qu…
Thermodynamics sheds light on the nature of dark matter galactic halos
Andrés Aceña, Juan Barranco, Argelia Bernal +1
In spherical symmetry, the gravitational potential is uniquely determined by the rotational velocity profile. Numerous galaxies exhibit a universal velocity profile from which a un…
Constrains on dark matter cross section with standard model particles from the orbital period decay of binary pulsars
Gonzalo Agustin Lucero, Argelia Bernal, Juan Barranco +1
It is shown that the data from the orbital period decay of binary pulsars give strong constraints on the dark matter-nucleons cross section. The limits are robust and competitive b…