The tension of cosmological magnetic fields as a contribution to dark energy

Abstract

We propose that cosmological magnetic fields generated in regions of finite spatial dimensions may manifest themselves in the global dynamics of the Universe as `dark energy'. We test our model in the context of spatially flat cosmological models by assuming that the Universe contains non-relativistic matter ${\rho }_m\propto {\alpha }^{-3}$, dark energy ${\rho }_Q\propto {\alpha }^{-3(1+w)}$, and an extra fluid with ${\rho }_B\propto {\alpha }^{n-3}$ that corresponds to the magnetic field. We place constraints on the main cosmological parameters of our model by combining the recent supernovae type Ia data and the differential ages of passively evolving galaxies. In particular, we find that the model which best reproduces the observational data when ${\Omega }_m=0.26$ is one with ${\Omega }_B\simeq 0.03$, $n\simeq 7.68$, ${\Omega }_Q\simeq 0.71$ and $w\simeq -0.8$.

6 pages, 2 figures, A&A in press

References in corpus (5)

• Wilkinson Microwave Anisotropy Probe (WMAP) Three Year Results: Implications for Cosmology
• New Hubble Space Telescope Discoveries of Type Ia Supernovae at z > 1: Narrowing Constraints on the Early Behavior of Dark Energy
• Robust Dark Energy Constraints from Supernovae, Galaxy Clustering, and Three-Year Wilkinson Microwave Anisotropy Probe Observations
• The Cosmic Battery Revisited
• The Growth of Baryonic Structure in the Presence of Cosmological Magnetic Pressure

Cited by in corpus (3)

• Confronting Dark Energy Models using Galaxy Cluster Number Counts
• The spherical collapse model and cluster formation beyond the $\Lambda$ cosmology: Indications for a clustered dark energy?
• A Null Test of the Metric Nature of the Cosmic Acceleration