7 papers
Hawking emission of massive vector fields by Kerr black holes
Marco CalzÃ, Miguel Faria, Yuber F. Perez-Gonzalez +1
We compute, for the first time, the Hawking emission spectrum of massive vector (Proca) fields by spinning Kerr black holes, determining the associated greybody factors and the res…
String Axiverse Enhancement of Superradiant Dark Matter Production
Diogo S. Gorgulho, Jacob A. Litterer, João G. Rosa
We study the effects of string axion emission on dark matter production by light primordial black holes (PBHs), through both evaporation and superradiance. We show, in particular,…
From scalar clouds around evaporating black holes to boson star
Daniel Neves, João G. Rosa
We study, for the first time, the evolution of a scalar cloud bound to an evaporating black hole. Our simulations of the associated Schrödinger-Poisson system for non-relativistic…
Dark neutron stars from a heavy dark sector
Jacob A. Litterer, João G. Rosa
We study the formation and properties of dark neutron stars in a scenario where dark matter is made up of (heavy) dark baryons in a sequestered copy of the MSSM. This scenario natu…
Constraints on Dark Matter Structures around Gaia Black Holes
Nuno P. Branco, Ricardo Z. Ferreira, João G. Rosa +1
We demonstrate that Gaia's detection of stars on wide orbits around black holes opens a new observational window on dark matter structures -- such as scalar clouds and dark matter…
Preheated inflation
Diogo S. Gorgulho, João G. Rosa
We propose a new mechanism of non-thermal particle production during inflation based on a narrow parametric resonance, akin to the dynamics of post-inflationary preheating. The mec…