69 citations · 341 across the 14 of their papers we have counts for
14 papers
Boson Star Factory: Past, Present, and Future
Romain Gervalle, Jorge Filipe Mónico Delgado, Etevaldo dos Santos Costa Filho +4
Boson stars are self-gravitating solitons of the Einstein-Klein-Gordon equations for a massive complex scalar field, and arguably the simplest horizonless compact objects arising i…
Slowly Rotating Boson Stars
Jorge F. M. Delgado, Juan Carlos Degollado, Luis E. Martínez +1
We present solutions to the Einstein-Klein Gordon system representing boson stars in the slow rotation approximation. By considering slow rotation we are able to reduce the number…
EMRIs around black holes with synchronised hair
Jorge F. M. Delgado, Carlos A. R. Herdeiro, Eugen Radu
We study extreme mass ratio inspirals (EMRIs) due to an infalling Light Compact Object (LCO) onto a generic class of stationary and axi-symmetric massive compact objects (MCO - wit…
Exploring the Small Mass Limit of Stationary Black Holes in Theories with Gauss-Bonnet Terms
Pedro G. S. Fernandes, David J. Mulryne, Jorge F. M. Delgado
In this work we examine the small mass limit of black holes, with and without spin, in theories where a scalar field is non-minimally coupled to a Gauss-Bonnet term. First, we prov…
Epicyclic Frequencies for a Generic Ultracompact Object
Jorge F. M. Delgado
Recently, it has been shown that the radial stability of a light-ring (LR) in a spacetime generated by a stationary, axisymmetric, asymptotically flat object with a …
Spinning Black Holes with Scalar Hair and Horizonless Compact Objects within and beyond General Relativity
Jorge F. M. Delgado
The last years have brought upon us a golden age of observational gravitational physics. The several observations by the LIGO/Virgo/KAGRA collaboration about gravitational waves an…
Equatorial timelike circular orbits around generic ultracompact objects
Jorge F. M. Delgado, Carlos A. R. Herdeiro, Eugen Radu
For a stationary, axisymmetric, asymptotically flat, ultra-compact [ containing light-rings (LRs)] object, with a north-south symmetry fixing an equatorial pla…
Kerr black holes with synchronised axionic hair
Jorge F. M. Delgado, Carlos A. R. Herdeiro, Eugen Radu
We construct and analyse Kerr black holes (BHs) with synchronised axionic hair. These are the BH generalisations of the recently constructed rotating axion boson stars arXiv:2005.0…
Rotating Axion Boson Stars
Jorge F. M. Delgado, Carlos A. R. Herdeiro, Eugen Radu
We construct and study rotating axion boson stars (RABSs). These are the spinning generalisations of the spherical gravitating solitons recently introduced in arXiv:1909.05515. RAB…
Spinning black holes in shift-symmetric Horndeski theory
Jorge F. M. Delgado, Carlos A. R. Herdeiro, Eugen Radu
We construct spinning black holes (BHs) in shift-symmetric Horndeski theory. This is an Einstein-scalar-Gauss-Bonnet model wherein the (real) scalar field couples linearly to the G…
Kerr black holes with synchronised scalar hair and higher azimuthal harmonic index
Jorge F. M. Delgado, Carlos A. R. Herdeiro, Eugen Radu
Kerr black holes with synchronised scalar hair and azimuthal harmonic index are constructed and studied. The corresponding domain of existence has a broader frequency range t…
Horizon geometry for Kerr black holes with synchronised hair
Jorge F. M. Delgado, Carlos A. R. Herdeiro, Eugen Radu
We study the horizon geometry of Kerr black holes (BHs) with scalar synchronised hair, a family of solutions of the Einstein-Klein-Gordon system that continuously connects to vacuu…
Kerr-Newman black holes with scalar hair
Jorge F. M. Delgado, Carlos A. R. Herdeiro, Eugen Radu +1
We construct electrically charged Kerr black holes (BHs) with scalar hair. Firstly, we take an uncharged scalar field, interacting with the electromagnetic field only indirectly, v…
Violations of the Kerr and Reissner-Nordstrom bounds: horizon versus asymptotic quantities
Jorge F. M. Delgado, Carlos A. R. Herdeiro, Eugen Radu
A central feature of the most elementary rotating black hole (BH) solution in General Relativity is the Kerr bound, which, for vacuum Kerr BHs, can be expressed either in terms of…