L'energie sombre: Un mirage cosmique? Luminosity distance {ne} proper distance: A cosmological dissimilitude induced by nonlinear electrodynamics

Journal Article · Wed Jun 23 00:00:00 EDT 2010 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3462603· OSTI ID:21410180

Mosquera Cuesta, Herman J ^[1]

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1. Instituto de Cosmologia, Relatividade e Astrofisica (ICRA-BR), Centro Brasileiro de Pesquisas Fisicas, Rua Dr. Xavier Sigaud 150, CEP 22290-180 Urca, Rio de Janeiro, RJ (Brazil) and Instituto de Fisica, Universidade Federal do Ceara(UFC), Fortaleza, Ceara (Brazil)

The current understanding of our universe is built upon the information that we extract from light coming from cosmological sources like far-away galaxies, quasars, supernovae, gamma-ray bursts, etc, including the emission in radio wavelengths of those sources. The particular analysis of supernovae type Ia (SNIa) observations has led to the idea that the universe is undergoing a late-time accelerate phase which started when it was at redshift z{approx}1. The redshift z is a cosmological parameter inferred from observations of emission (or absorption) lines from the expanding SNIa debris or from the supernova host galaxy, presuming the light properties and interactions, as described by Maxwell's theory, do not change while it travels through the intervening intergalactic magnetic fields. In this paper we demonstrate that the nonlinear electrodynamics (NLED) description of photon propagation through the weak background intergalactic magnetic fields introduces a fundamental modification of the cosmological redshift, as compared to the one that a direct computation within a specific cosmological model ascribes to a distant source. It is shown that independently of the class of NLED Lagrangian, the effective redshift turns out to be (1+z)|{sub eff} = (1+z){Delta}, where {Delta} {identical_to} (1+{Phi}{sub e})/(1+{Phi}{sub o}), with {Phi} {identical_to} 8/3(L{sub FF}/L{sub F})B{sup 2} being L{sub F} = dL/dF, L{sub FF} = d{sup 2}L/dF{sup 2}, the field F {identical_to} F{sub {alpha}{beta}F}{sup {alpha}{beta},} and B the magnetic field strength. It comes out that for field strengths as those estimated over the intergalactic space the effective redshift is always much lower than the standard redshift, and it recovers such limit when the NLED correction {Delta}({Phi}{sub e},{Phi}{sub o}){yields}1. Since we do not actually ever observe proper distances, then one can argue that for a particular redshift the observed luminosity distance of the light-emitting far-away source is different. The implications of this result for cosmography studies using SNIa (and gamma-ray bursts) are discussed.

• OSTI ID: 21410180
• Journal Information: AIP Conference Proceedings, Vol. 1241, Issue 1; Conference: Conference on invisible universe, Paris (France), 29 Jun - 3 Jul 2009; Other Information: DOI: 10.1063/1.3462603; (c) 2010 American Institute of Physics; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
ABSORPTION
COSMIC GAMMA BURSTS
COSMOLOGICAL MODELS
ELECTRODYNAMICS
EMISSION
GALAXIES
GAMMA SOURCES
INTERACTIONS
INTERGALACTIC SPACE
LAGRANGIAN FUNCTION
LUMINOSITY
MAGNETIC FIELDS
MODIFICATIONS
NONLINEAR PROBLEMS
PHOTONS
QUASARS
RED SHIFT
SUPERNOVAE
UNIVERSE
WAVELENGTHS
BINARY STARS
BOSONS
COSMIC RADIATION
COSMIC RADIO SOURCES
ELEMENTARY PARTICLES
ERUPTIVE VARIABLE STARS
FUNCTIONS
IONIZING RADIATIONS
MASSLESS PARTICLES
MATHEMATICAL MODELS
OPTICAL PROPERTIES
PHYSICAL PROPERTIES
PRIMARY COSMIC RADIATION
RADIATION SOURCES
RADIATIONS
SORPTION
SPACE
STARS
VARIABLE STARS