Constraining the New Aether: gravitational Cherenkov radiation

Elliott, Joshua; Moore, Guy D.; Stoica, Horace

doi:10.1088/1126-6708/2005/08/066

Cited by 208 publications

(275 citation statements)

References 26 publications

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“…Theoretical and observational constraints on the coupling parameters c i have been determined from parameterized postNewtonian analysis [26,27,28], stability and linearized energy positivity [29,30,31,32], primordial nucleosynthesis [25], and vacuum Cerenkov radiation [31]. The combined constraints from all of these are reviewed in Ref.…”

Section: Observational Constraints On the Parameters C Imentioning

confidence: 99%

Erratum: Neutron stars in Einstein-Aether theory [Phys. Rev. D76, 042003 (2007)]

Eling¹,

Jacobson²,

Miller³

2009

Phys. Rev. D

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As current and future experiments probe strong gravitational regimes around neutron stars and black holes, it is desirable to have theoretically sound alternatives to General Relativity against which to test observations. Here we study the consequences of one such generalization, Einstein-aether theory, for the properties of non-rotating neutron stars. This theory has a parameter range that satisfies all current weak-field tests. We find that within this range it leads to lower maximum neutron star masses, as well as larger surface redshifts at a particular mass, for a given nuclear equation of state. For non-rotating black holes and neutron stars, the innermost stable circular orbit is only slightly modified in this theory.

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Section: Observational Constraints On the Parameters C Imentioning

confidence: 99%

Erratum: Neutron stars in Einstein-Aether theory [Phys. Rev. D76, 042003 (2007)]

Eling¹,

Jacobson²,

Miller³

2009

Phys. Rev. D

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“…It defines a "preferred" frame, while its status as a dynamical field preserves diffeomorphism invariance. The condition on the vector norm (which can always be scaled to unity) ensures that the aether just picks out a preferred direction and removes instabilities in the unconstrained theory (see [5]). A review of properties of this theory and references to earlier work, can be found in [6].…”

Section: Introductionmentioning

confidence: 99%

“…Another constraint arises from imposing superluminal speeds, which is required to a first approximation by the absence of vacuumČerenkov radiation of gravity-aether shock waves [5]. Yet another constraint can be derived from primordial nucleosynthesis [14].…”

Section: Introductionmentioning

confidence: 99%

Erratum: Radiation damping in Einstein-aether theory [Phys. Rev. D73, 104012 (2006)]

Foster¹

2007

Phys. Rev. D

139

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This work concerns the loss of energy of a material system due to gravitational radiation in Einstein-aether theory-an alternative theory of gravity in which the metric couples to a dynamical, timelike, unit-norm vector field. Derived to lowest post-Newtonian order are waveforms for the metric and vector fields far from a nearly Newtonian system and the rate of energy radiated by the system. The expressions depend on the quadrupole moment of the source, as in standard general relativity, but also contain monopolar and dipolar terms. There exists a one-parameter family of Einstein-aether theories for which only the quadrupolar contribution is present, and for which the expression for the damping rate is identical to that of general relativity to the order worked to here. This family cannot yet be declared observationally viable, since effects due to the strong internal fields of bodies in the actual systems used to test the damping rate are not included.

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“…To properly understand its behaviour in these regimes, we would need to at least consider higher order corrections, and ultimately some ultra-violet completion of the theory would be necessary. Such a completion might conceivably simply involve extra fields [11], or, more likely, more complicated dynamics.…”

Section: Discussionmentioning

confidence: 99%

Cosmology of a universe with spontaneously broken Lorentz symmetry

et al. 2007

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A self consistent effective field theory of modified gravity has recently been proposed with spontaneous breaking of local Lorentz invariance. The symmetry is broken by a vector field with the wrong-sign mass term and it has been shown to have additional graviton modes and modified dispersion relations. In this paper we study the evolution of a homogeneous and isotropic universe in the presence of such a vector field with a minimum lying along the time-like direction. A plethora of different regimes is identified, such as accelerated expansion, loitering, collapse and tracking.

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Constraining the New Aether: gravitational Cherenkov radiation

Cited by 208 publications

References 26 publications

Erratum: Neutron stars in Einstein-Aether theory [Phys. Rev. D76, 042003 (2007)]

Erratum: Neutron stars in Einstein-Aether theory [Phys. Rev. D76, 042003 (2007)]

Erratum: Radiation damping in Einstein-aether theory [Phys. Rev. D73, 104012 (2006)]

Cosmology of a universe with spontaneously broken Lorentz symmetry

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