Zobrazeno 1 - 10
of 68
pro vyhledávání: '"S. E. Perez"'
The electric potential and the electromagnetic field for a linearly accelerated Born-Infeld charged particle are obtained in an inertial frame by a method that can, in principle, be applied to any electromagnetic theory. The method is based on (i) th
Externí odkaz:
http://arxiv.org/abs/2405.09435
In the context of the de Broglie-Bohm pilot wave theory, numerical simulations for simple systems have shown that states that are initially out of quantum equilibrium - thus violating the Born rule - usually relax over time to the expected $|\psi|^2$
Externí odkaz:
http://arxiv.org/abs/2007.02939
Publikováno v:
Phys. Rev. D 101, 103503 (2020)
We investigate primordial magnetogenesis and the evolution of the electromagnetic field through a quantum bounce, in a model that starts in the far past from a contracting phase where only dust is present and the electromagnetic field is in the adiab
Externí odkaz:
http://arxiv.org/abs/2004.07269
Publikováno v:
Eur. Phys. J. C (2019) 79: 267
We present an application to cosmological models in $f({\cal R})$ theories within the Palatini formalism of a method that combines cosmography and the explicit form of the field equations in the calculation of the redshift drift. The method yields a
Externí odkaz:
http://arxiv.org/abs/1811.08176
We analyse configurations of compact stars in the so-called R-squared gravity in the Palatini formalism. Using a realistic equation of state we show that the mass-radius configurations are lighter than their counterparts in General Relativity. We als
Externí odkaz:
http://arxiv.org/abs/1607.03508
We study the propagation of bubbles of new vacuum in a radially inhomogeneous background filled with dust or radiation, and including a cosmological constant, as a first step in the analysis of the influence of inhomogeneities in the evolution of an
Externí odkaz:
http://arxiv.org/abs/1606.07500
Publikováno v:
Phys. Rev. D 86, 103525 (2012)
Several features of an $f(R)$ theory in which there is a maximum value for the curvature are analyzed. The theory admits the vaccuum solutions of GR, and also the radiation evolution for the scale factor of the standard cosmological model. Working in
Externí odkaz:
http://arxiv.org/abs/1205.3458
Autor:
Novello, M., Bergliaffa, S. E. Perez
Publikováno v:
Phys.Rept.463:127-213,2008
We review the general features of nonsingular universes ({\em i.e.} those that go from an era of accelerated collapse to an expanding era without displaying a singularity) as well as cyclic universes. We discuss the mechanisms behind the bounce, and
Externí odkaz:
http://arxiv.org/abs/0802.1634
Publikováno v:
JCAP 0704:011,2007
We show (in a completely analytical and exact manner) that an efficient magnetic field amplification method is operative during the bounce in a time-dependent gauge coupling model. The cosmological magnetic fields so generated have particular spectra
Externí odkaz:
http://arxiv.org/abs/astro-ph/0612281
Publikováno v:
Class.Quant.Grav.24:3021-3036,2007
It will be shown that a given realization of nonlinear electrodynamics, used as source of Einstein's equations, generates a cosmological model with interesting features, namely a phase of current cosmic acceleration, and the absence of an initial sin
Externí odkaz:
http://arxiv.org/abs/gr-qc/0610043