Can a nonlinear electrodynamics avoid the initial singularity?

Details Can a nonlinear electrodynamics avoid the initial singularity? Can a nonlinear electrodynamics avoid the initial singularity?

Aug 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003basbr..23...63d&link_type=abstract

Boletim da Sociedade Astronômica Brasileira (ISSN 0101-3440), vol.23, no.1, p. 63-64

Astronomy and Astrophysics

Astronomy

Scientific paper

A fundamental difficulty underlying standard FRW cosmologies is the prediction of an initial singularity. Several mechanisms have been proposed in an attempt to solve this problem. Some examples are: a creation-field cosmology, a huge vacuum energy density at very early times, quadratic Lagrangians for the gravitational field, nonminimal couplings, nonequilibrium thermodynamic effects and quantum-gravitational phenomena. In this work we investigate the possibility of avoiding the cosmic initial singularity as a consequence of nonlinear effects on the Maxwell electromagnetic theory. For a FRW geometry we derive the general nonsingular solution in the absence of a vacuum energy density. The form of this analytic extension of the FRW model is not significantly altered by the presence of a nonvanishing vacuum energy density and nonsingular behavior of solutions with a time-dependent L(t)-term are also examined. All models, are examples of bouncing universes which may exhibit an inflationary dynamics driven by the nonlinear corrections of the magnetic field.

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