Lorentz violating inflation

Kanno, Sugumi; Soda, Jiro

doi:10.1103/physrevd.74.063505

Cited by 114 publications

(217 citation statements)

References 49 publications

(44 reference statements)

Supporting

Mentioning

208

Contrasting

Order By: Relevance

“…Quite distinctly, it has been suggested that the recent acceleration of the universe could be accounted for by allowing for non-canonical kinetic terms in the action of the electromagnetic field [15]. Recently the possibility of a scalar field coupled to the Aether as a cause of inflation has been examined [16].…”

Section: Introductionmentioning

confidence: 99%

Modifying gravity with the aether: An alternative to dark matter

2007

View full text Add to dashboard Cite

There is evidence that Newton and Einstein's theories of gravity cannot explain the dynamics of a universe made up solely of baryons and radiation. To be able to understand the properties of galaxies, clusters of galaxies and the universe on the whole it has become commonplace to invoke the presence of dark matter. An alternative approach is to modify the gravitational field equations to accommodate observations. We propose a new class of gravitational theories in which we add a new degree of freedom, the Aether, in the form of a vector field that is coupled covariantly, but non-minimally, with the space-time metric. We explore the Newtonian and non-Newtonian limits, discuss the conditions for these theories to be consistent and explore their effect on cosmology.

show abstract

Section: Introductionmentioning

confidence: 99%

Modifying gravity with the aether: An alternative to dark matter

2007

View full text Add to dashboard Cite

show abstract

“…It is this equation which has motivated our choice of the action (10) and (11). Indeed, in general one would have obtained a non-local equation, whereas here, the effective equation of motion of Φ p is simply…”

Section: A the Modelmentioning

confidence: 99%

“…Since the background is homogeneous, the fields decompose into Fourier modes labeled by the comoving wave vector p. Moreover, when the cosmological and preferred frames coincide (see [11]), the action splits into disconnected sectors,…”

Section: A the Modelmentioning

confidence: 99%

Inflationary spectra from Lorentz violating dissipative models

et al. 2008

View full text Add to dashboard Cite

The sensitivity of inflationary spectra to initial conditions is addressed in the context of a phenomenological model that breaks Lorentz invariance by dissipative effects above some threshold energy Λ. These effects are obtained dynamically by coupling the fluctuation modes to extra degrees of freedom which are unobservable below Λ. Because of the strong dissipative effects in the early propagation, only the state of the extra degrees of freedom is relevant for the power spectrum. If this state is the ground state, and if Λ is much larger than the Hubble scale H, the standard spectrum is recovered. Using analytical and numerical methods, we calculate the modifications for a large class of dissipative models. For all of these, we show that the leading modification (in an expansion in H/Λ) is linear in the decay rate evaluated at horizon exit, and that high frequency superimposed oscillations are not generated. The modification is negative when the decay rate decreases slower than the cube of H, which means that there is a loss of power on the largest scales.

show abstract

“…Examples include [80,81,82,83,84,85,86]. In general, these models, which incorporate vector or tensor fields that spontaneously break Lorentz symmetry, are studied as possible alternative theories of dark energy.…”

Section: Spontaneous Lorentz Violationmentioning

confidence: 99%

Observational Constraints on Local Lorentz Invariance

Bluhm

2014

Springer Handbook of Spacetime

View full text Add to dashboard Cite

The idea that local Lorentz invariance might be violated due to new physics that goes beyond the Standard Model of particle physics and Einstein's General Relativity has received a great deal of interest in recent years. At the same time, new experiments have been designed and conducted that are able to test Lorentz symmetry at unprecedented levels. Much of this theoretical and experimental progress has been driven by the development of the framework for investigating Lorentz violation known as the Standard Model Extension (SME). The SME is the lagrangian-based effective field theory that by definition contains all Lorentz-violating interaction terms that can be written as observer scalars involving particle fields in the Standard Model and gravitational fields in a generalized theory of gravity. This includes all terms that could arise from a process of spontaneous Lorentz violation as well as terms that explicitly break Lorentz symmetry. In this article, an overview of the SME is presented, including its motivations and construction. A very useful minimal version of the SME in Minkowski spacetime that maintains gauge invariance and power-counting renormalizability is constructed as well. Data tables summarizing tests of local Lorentz invariance for the different particle sectors in the Standard Model and with gravity are maintained by Kostelecký's group at Indiana University. A partial survey of these tests, including some of the high-precision sensitivities they attain, is presented here.

show abstract

Lorentz violating inflation

Cited by 114 publications

References 49 publications

Modifying gravity with the aether: An alternative to dark matter

Modifying gravity with the aether: An alternative to dark matter

Inflationary spectra from Lorentz violating dissipative models

Observational Constraints on Local Lorentz Invariance

Contact Info

Product

Resources

About