Argelia Bernal
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View article: Science Prospects for the Southern Wide-field Gamma-ray Observatory: SWGO
Science Prospects for the Southern Wide-field Gamma-ray Observatory: SWGO Open
Ground-based gamma-ray astronomy is now well established as a key observational approach to address critical topics at the frontiers of astroparticle physics and high-energy astrophysics. Whilst the field of TeV astronomy was once dominate…
View article: Absence of TeV halos around millisecond pulsars
Absence of TeV halos around millisecond pulsars Open
TeV halos are extended very-high-energy (VHE; 0.1-100 TeV) gamma-ray emission around middle-aged pulsars. So far they have only been found around isolated pulsars, but it has been suggested that they may also be powered by millisecond puls…
View article: Study of the IC 443 region with the HAWC observatory
Study of the IC 443 region with the HAWC observatory Open
Supernova remnants are one potential source class considered a PeVatron (i.e. capable of accelerating cosmic rays above PeV energies). The shock fronts produced after the explosion of the supernova are ideal regions for particle accelerati…
Gravitational atoms beyond the test field limit: The case of Sgr A* and ultralight dark matter Open
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 quasi-stationary approximation. We resolve the region near th…
View article: Spectral Study of Very-high-energy Gamma Rays from SS 433 with HAWC
Spectral Study of Very-high-energy Gamma Rays from SS 433 with HAWC Open
Very-high-energy (0.1–100 TeV) gamma-ray emissions were observed in High-Altitude Water Cherenkov (HAWC) data from the lobes of the microquasar SS 433, making them the first set of astrophysical jets that were resolved at TeV energies. In …
Constrains on dark matter cross section with standard model particles from the orbital period decay of binary pulsars Open
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 because this new method for testing dark matter interactions…
Preliminary Study of Dark-matter-dominated Systems: Further Analysis for Galactic Dark Matter Halos with Pressure Open
Low-surface-brightness galaxies are excellent laboratories, where stars and baryonic matter act as tracers of the gravitational potential of the dark matter halo. If dark matter is modeled as a perfect fluid, then spherically symmetric and…
Thermodynamics sheds light on the nature of dark matter galactic halos Open
In spherical symmetry, the gravitational potential is uniquely determined by the rotational velocity profile. Numerous galaxies exhibit a universal velocity profile from which a universal gravitational profile is inferred. When treating da…
Bayesian analysis for rotational curves with ℓ-boson stars as a dark matter component Open
Using Low Brightness Surface Galaxies (LBSG) rotational curves we inferred the free parameters of ℓ -boson stars as a dark matter component. The ℓ -boson stars are numerical solutions to the non-relativistic limit of the Einstein-Klein-Gor…
Bayesian analysis for rotational curves with $\ell$-boson stars as a dark matter component Open
Using Low Brightness Surface Galaxies (LBSG) rotational curves we inferred the free parameters of $\ell$-boson stars as a dark matter component. The $\ell$-boson stars are numerical solutions to the non-relativistic limit of the Einstein-K…
Dark energy from a geometrical gauge scalar-tensor theory of gravity Open
In this paper we obtain some cosmological solutions that describe the present period of accelerating expansion of the Universe in the framework of a geometrical gauge scalar-tensor theory of gravity. The background geometry in the model is…
Boson stars and their relatives in semiclassical gravity Open
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 semiclassical Einstein-Klein-Gordon system for a {\it single real …
Self-interacting scalar field distributions around Schwarzschild black holes Open
Long-lived configurations of massive scalar fields around black holes may form if the coupling between the mass of the scalar field and the mass of the black hole is very small. In this work we analyze the effect of self-interaction in the…
Extreme <i>ℓ</i>-boson stars Open
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 consists in incorporating some of the effects of angular mome…
Head-on collisions of $\ell$-boson stars Open
Fully non-linear numerical evolutions of the Einstein-(multi)--Klein-Gordon equations are performed to study head-on collisions of $\ell$-boson stars. Despite being spherically symmetric, $\ell$-boson stars have a (hidden) frame of referen…
Preliminary Study on Dark Matter-Dominated Systems: Further Analysis for galactic dark matter halos with Pressure Open
Low surface brightness galaxies are an excellent laboratory where stars and baryonic matter act as tracers of the gravitational potential of the dark matter halo. If dark matter is modeled as a perfect fluid, then spherically symmetric and…
Extreme $\ell$-boson stars Open
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 consists in incorporating some of the effects of angular mome…
Dynamical -boson stars: Generic stability and evidence for nonspherical solutions Open
l-boson stars are static, spherical, multifield self-gravitating solitons. They are asymptotically flat, finite energy solutions of Einstein's gravity minimally coupled to an odd number of massive, complex scalar fields. A previous study a…
Dynamical evolutions of ℓ-boson stars in spherical symmetry Open
In previous work, we have found new static, spherically symmetric boson star solutions which generalize the standard boson stars (BSs) by allowing a particular superposition of scalar fields in which each of the fields is characterized by …
View article: Constraining ultra light fermionic dark matter with Milky-Way observations
Constraining ultra light fermionic dark matter with Milky-Way observations Open
The equation of state for a degenerate gas of fermions at zero temperature in the non-relativistic case is a polytrope, i.e. $p \simρ^{5/3}/m_F^{8/3}$. If dark matter is modeled by such a non-interacting fermion, this dependence in the mas…
View article: Constraining ultra light fermionic dark matter with galactic observations
Constraining ultra light fermionic dark matter with galactic observations Open
The equation of state for a free gas of fermions at zero temperature in the non relativistic case is a polytrope, i.e. $p=\gamma \rho^{5/3}/m_F^{8/3}$. If dark matter is modelled by such non interacting fermion, this dependence in the mass…
View article: Kinematics and dynamics of the luminous infrared galaxy pair NGC 5257/58 (Arp 240)
Kinematics and dynamics of the luminous infrared galaxy pair NGC 5257/58 (Arp 240) Open
Context. Encounters between galaxies modify their morphology, kinematics, and star formation history. The relation between these changes and external perturbations is not straightforward. The great number of parameters involved requires bo…
$ \newcommand{\e}{{\rm e}} \boldsymbol {\ell}$ -boson stars Open
We present new, fully nonlinear numerical solutions to the static,\nspherically symmetric Einstein-Klein-Gordon system for a collection of an\narbitrary odd number $N$ of complex scalar fields with an internal $U(N)$\nsymmetry and no self-…
Search for Dark Matter Gamma-ray Emission from the Andromeda Galaxy with the High-Altitude Water Cherenkov Observatory Open
The Andromeda Galaxy (M31) is a nearby ($\\sim$780 kpc) galaxy similar to our own Milky Way. Observational evidence suggests that it resides in a large halo of dark matter (DM), making it a good target for DM searches. We present a search …
Self-gravitating black hole scalar wigs Open
It has long been known that no static, spherically symmetric, asymptotically\nflat Klein-Gordon scalar field configuration surrounding a nonrotating black\nhole can exist in general relativity. In a series of previous papers we proved\ntha…