Zobrazeno 1 - 10
of 152
pro vyhledávání: '"Rubio, Marcelo"'
Numerical simulations of the Cauchy problem for self-interacting massive vector fields often face instabilities and apparent pathologies. We explicitly demonstrate that these issues, previously reported in the literature, are actually due to the brea
Externí odkaz:
http://arxiv.org/abs/2407.08774
Publikováno v:
JCAP11(2023)001
Partial differential equations exhibiting an anisotropic scaling between space and time -- such as those of Horava-Lifshitz gravity -- have a dispersive nature. They contain higher-order spatial derivatives, but remain second order in time. This is i
Externí odkaz:
http://arxiv.org/abs/2307.13041
Publikováno v:
Phys. Rev. D 107, 103041 (2023)
We present the first numerical simulations of the symmetric--hyperbolic theory for conformal dissipative relativistic fluids developed in [1]. In this theory, the information of the fluid dynamics is encoded in a scalar generating function which depe
Externí odkaz:
http://arxiv.org/abs/2304.08584
Publikováno v:
Entropy 2022, 24(11), 1612
We present numerical simulations for the evolution of an expanding system of massless scalar fields with quartic coupling. By setting a rotating, non-isotropic initial configuration, we compute the energy density, the transverse and longitudinal pres
Externí odkaz:
http://arxiv.org/abs/2210.05504
Autor:
Magaña, Juan, Martín, Marco San, Sureda, Joaquín, Rubio, Marcelo E., Araya, Ignacio J., Padilla, Nelson D.
We introduce a modification of the Press-Schechter formalism aimed to derive general mass functions for primordial black holes (PBHs). In this case, we start from primordial power spectra (PPS) which include a monochromatic spike, typical of ultra sl
Externí odkaz:
http://arxiv.org/abs/2207.13689
Autor:
Araya, Ignacio J., Padilla, Nelson D., Rubio, Marcelo E., Sureda, Joaquín, Magaña, Juan, Osorio, Loreto
Publikováno v:
JCAP02(2023)030
We explore the possibility that primordial black holes (PBHs) contain electric charge down to the present day. We find that PBHs should hold a non-zero net charge at their formation, due to either Poisson fluctuations at horizon crossing or high-ener
Externí odkaz:
http://arxiv.org/abs/2207.05829
Autor:
Araya, Ignacio J., Rubio, Marcelo E., Martin, Marco San, Stasyszyn, Federico A., Padilla, Nelson D., Magana, Juan, Sureda, Joaquin
We introduce a statistical method for estimating magnetic field fluctuations generated from primordial black hole (PBH) populations. To that end, we consider monochromatic and extended Press-Schechter PBH mass functions, such that each constituent is
Externí odkaz:
http://arxiv.org/abs/2012.09585
We show that the initial-value problem for the non-relativistic magnetic dynamo equation turns out to be ill-posed when the electromotive force depends linearly on the magnetic field. This result implies that the increasing of magnetic energy does no
Externí odkaz:
http://arxiv.org/abs/2004.06624
Publikováno v:
JSP (2020)
We address the well-posedness of the Cauchy problem corresponding to the relativistic fluid equations, when coupled with the heat-flux constitutive relation arising within the relativistic Chapman-Enskog procedure. The resulting system of equations i
Externí odkaz:
http://arxiv.org/abs/1908.04445