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Cosmic alignment of the aether · Around

2010

Cosmic alignment of the aether

Carruthers, Isaac, Jacobson, Ted

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In Einstein-aether theory and Horava gravity, a timelike unit vector is coupled to the spacetime metric.

It has previously been shown that in an exponentially expanding homogeneous, isotropic background, small perturbations of the vector relax back to the isotropic frame.
Here we investigate large deviations from isotropy, maintaining homogeneity.
We find that, for generic values of the coupling constants, the aether and metric relax to the isotropic configuration if the initial aether hyperbolic boost angle and its time derivative in units of the cosmological constant are less than something of order unity.

Built on

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D. Mattingly and T. Jacobson, “Relativistic gravity with a dynamical preferred frame,” in Proceedings of the Second Meeting on CPT and Lorentz Symmetry · 2002
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S. M. Carroll and E. A. Lim, “Lorentz-violating vector fields slow the universe down,” Phys. Rev
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E. A. Lim, “Can we see Lorentz-violating vector fields in the CMB?,” Phys. Rev
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D. Blas, O. Pujolas, and S. Sibiryakov, “Models of non-relativistic quantum gravity: the good, the bad and the healthy,” arXiv:1007.3503 [hep-th]

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