Zobrazeno 1 - 10
of 116
pro vyhledávání: '"Degollado, Juan Carlos"'
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 of equations yielding a system of ordinary differential equations that
Externí odkaz:
http://arxiv.org/abs/2408.05262
Publikováno v:
Phys. Rev. D 110, 084011. Published 2 October 2024
We analyze numerically the dynamical transition to spontaneous scalarization in neutron stars in the framework of a scalar-tensor theory of gravity where the scalar field is free but massive, and it is coupled nonminimally to gravity in the Jordan fr
Externí odkaz:
http://arxiv.org/abs/2407.08124
Autor:
Nunez, Daniel, Degollado, Juan Carlos
We describe the dynamical formation of the shadow of a collapsing star in a Hayward spacetime in terms of an observer far away from the center and a free falling observer. By solving the time-like and light-like radial geodesics we determine the angu
Externí odkaz:
http://arxiv.org/abs/2312.17559
We study the Einstein-Klein-Gordon system coupled to the Born-Infeld electrodynamics. We explore the solution space of a static spherically symmetric, complex scalar field minimally coupled to both gravitational and electromagnetic fields. The result
Externí odkaz:
http://arxiv.org/abs/2303.13666
Autor:
Alcubierre, Miguel, Barranco, Juan, Bernal, Argelia, Degollado, Juan Carlos, Diez-Tejedor, Alberto, Megevand, Miguel, Núñez, Darío, Sarbach, Olivier
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 quantum} sc
Externí odkaz:
http://arxiv.org/abs/2212.02530
Autor:
Villegas, Laura O., Ramirez-Codiz, Eduardo, Jaramillo, Víctor, Degollado, Juan Carlos, Moreno, Claudia, Núñez, Darío, Romero-Cruz, Fernando J.
We present a method to determine the angular momentum of a black hole, based on observations of the trajectories of the bodies in the Kerr space-time. We use the Hamilton equations to describe the dynamics of a particle and present results for equato
Externí odkaz:
http://arxiv.org/abs/2211.10464
Autor:
Aguilar-Nieto, Alejandro, Jaramillo, Víctor, Barranco, Juan, Bernal, Argelia, Degollado, Juan Carlos, Núñez, Darío
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 distributi
Externí odkaz:
http://arxiv.org/abs/2211.10456
Autor:
Jaramillo, Víctor, Sanchis-Gual, Nicolas, Barranco, Juan, Bernal, Argelia, Degollado, Juan Carlos, Herdeiro, Carlos, Megevand, Miguel, Núñez, Darío
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 reference, used in
Externí odkaz:
http://arxiv.org/abs/2202.00696
Modelling as a dipole the magnetic interaction of a binary system of neutron stars, we are able to include the magnetic effects in the Newtonian and in the inspiral dynamics of the system using an equivalent one-body description. Furthermore, in the
Externí odkaz:
http://arxiv.org/abs/2201.02287
Autor:
Alcubierre, Miguel, Barranco, Juan, Bernal, Argelia, Degollado, Juan Carlos, Diez-Tejedor, Alberto, Jaramillo, Víctor, Megevand, Miguel, Núñez, Darío, Sarbach, Olivier
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 momentum, while
Externí odkaz:
http://arxiv.org/abs/2112.04529