109 citations · 768 across the 21 of their papers we have counts for
19 papers · 1 filter
-Boson stars in anti-de Sitter spacetime
Miguel Megevand
In previous work, we introduced the -boson stars, a generalization of standard boson stars, which are parameterized by an angular momentum number , while still preservi…
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…
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…
Boson stars and their relatives in semiclassical gravity
Miguel Alcubierre, Juan Barranco, Argelia Bernal +5
We construct boson star configurations in quantum field theory using the semiclassical gravity approximation. Restricting our attention to the static case, we show that the semicla…
Head-on collisions of -boson stars
Víctor Jaramillo, Nicolas Sanchis-Gual, Juan Barranco +5
Fully non-linear numerical evolutions of the Einstein-(multi)--Klein-Gordon equations are performed to study head-on collisions of -boson stars. Despite being spherically sym…
Extreme -boson stars
Miguel Alcubierre, Juan Barranco, Argelia Bernal +6
A new class of complex scalar field objects, which generalize the well known boson stars, was recently found as solutions to the Einstein-Klein-Gordon system. The generalization co…
On the linear stability of -boson stars with respect to radial perturbations
Miguel Alcubierre, Juan Barranco, Argelia Bernal +5
In previous work we constructed new boson star solutions consisting of a family of massive complex scalar fields minimally coupled to gravity in which the individual fields have an…
Stability study of a model for the Klein-Gordon equation in Kerr space-time II
Horst Reinhard Beyer, Miguel Alcubierre, Miguel Megevand
The present paper is a follow-up of our previous paper that derives a slightly simplified model equation for the Klein-Gordon equation, describing the propagation of a scalar field…
Dynamical evolutions of -boson stars in spherical symmetry
Miguel Alcubierre, Juan Barranco, Argelia Bernal +5
In previous work, we have found new static, spherically symmetric boson star solutions which generalize the standard boson stars by allowing a particular superposition of scalar fi…
-Boson stars
Miguel Alcubierre, Juan Barranco, Argelia Bernal +5
We present new, fully nonlinear numerical solutions to the static, spherically symmetric Einstein-Klein-Gordon system for a collection of an arbitrary odd number of complex sca…
Self-gravitating black hole scalar wigs
Juan Barranco, Argelia Bernal, Juan Carlos Degollado +4
It has long been known that no static, spherically symmetric, asymptotically flat Klein-Gordon scalar field configuration surrounding a nonrotating black hole can exist in general…
Numerical simulations of loop quantum Bianchi-I spacetimes
Peter Diener, Anton Joe, Miguel Megevand +1
Due to the numerical complexities of studying evolution in an anisotropic quantum spacetime, in comparison to the isotropic models, the physics of loop quantized anisotropic models…
Numerical evolution of squeezed and non-Gaussian states in loop quantum cosmology
Peter Diener, Brajesh Gupt, Miguel Megevand +1
In recent years, numerical simulations with Gaussian initial states have demonstrated the existence of a quantum bounce in loop quantum cosmology in various models. A key issue per…
Schwarzschild scalar wigs: spectral analysis and late time behavior
Juan Barranco, Argelia Bernal, Juan Carlos Degollado +5
Using the Green's function representation technique, the late time behavior of localized scalar field distributions on Schwarzschild spacetimes is studied. Assuming arbitrary initi…
Schwarzschild black holes can wear scalar wigs
Juan Barranco, Argelia Bernal, Juan Carlos Degollado +5
We study the evolution of a massive scalar field surrounding a Schwarzschild black hole and find configurations that can survive for arbitrarily long times, provided the black hole…
Stability study of a model for the Klein-Gordon equation in Kerr spacetime
Horst Reinhard Beyer, Miguel Alcubierre, Miguel Megevand +1
The current early stage in the investigation of the stability of the Kerr metric is characterized by the study of appropriate model problems. Particularly interesting is the proble…
Are black holes a serious threat to scalar field dark matter models?
Juan Barranco, Argelia Bernal, Juan Carlos Degollado +5
Classical scalar fields have been proposed as possible candidates for the dark matter component of the universe. Given the fact that super-massive black holes seem to exist at the…
Method to estimate ISCO and ring-down frequencies in binary systems and consequences for gravitational wave data analysis
Chad Hanna, Miguel Megevand, Evan Ochsner +1
Recent advances in the description of compact binary systems have produced gravitational waveforms that include inspiral, merger and ring-down phases. Comparing results from numeri…
Scalar field confinement as a model for accreting systems
Miguel Megevand, Ignacio Olabarrieta, Luis Lehner
We investigate the possibility to localize scalar field configurations as a model for black hole accretion. We analyze and resolve difficulties encountered when localizing scalar f…