Nonsingular FRW cosmology and nonlinear electrodynamics

Details Nonsingular FRW cosmology and nonlinear electrodynamics Nonsingular FRW cosmology and nonlinear electrodynamics

2004-02-12

arxiv.org/abs/astro-ph/0402311v1

Phys.Rev. D69 (2004) 123504

Astronomy and Astrophysics

Astrophysics

20 pages, 7 figures

Scientific paper

10.1103/PhysRevD.69.123504

The possibility to avoid the cosmic initial singularity as a consequence of nonlinear effects on the Maxwell eletromagnetic theory is discussed. For a flat FRW geometry we derive the general nonsingular solution supported by a magnetic field plus a cosmic fluid and a nonvanishing vacuum energy density. The nonsingular behavior of solutions with a time-dependent $\Lambda(t)$-term are also examined. As a general result, it is found that the functional dependence of $\Lambda(t)$ can uniquely be determined only if the magnetic field remains constant. All these 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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