Some impacts of Lorentz violation on cosmology

Arianto,; Zen, Freddy P.; Gunara, Bobby Eka; Triyanta,; Supardi, .

doi:10.1088/1126-6708/2007/09/048

Cited by 31 publications

(51 citation statements)

References 49 publications

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“…Using observational data and by a suitable fine tuning it is possible to construct a reliable Lorentz violating cosmological model. A similar strategy has been applied for inflation in reference [2]. Another aspect of our model is the fact that it contains several crossing of phantom divided barrier, a phenomena which has been seen in other scenarios [30,31,32].…”

Section: Discussionmentioning

confidence: 98%

“…One of the interesting feature of this scenario is that the exact Lorentz violating inflationary solutions are related to the absence of the inflaton potential. In this case, the inflation is completely associated with the Lorentz violation and depends on the value of the coupling parameter [2]. Standard cosmology with a pressureless fluid as matter content of the universe, predicts a universe either expanding forever or re-collapsing eventually depending on the spatial geometry.…”

Section: Motivationmentioning

confidence: 99%

“…One can see that β 4 does not contribute to the background dynamics [1,2]. The energy equations for the vector field u and scalar field, φ are as follows…”

Section: (φ)mentioning

confidence: 99%

“…With these preliminaries, dynamics of the model is described by the following Friedmann equations [1,2] 1 + 1 8πGβ…”

Section: (φ)mentioning

confidence: 99%

“…Thus, the value of m may be chosen to fit with the present observable constraint on the equation of state parameter. If we use the values of m obtained in [2], we can calculate ω φ versus m. This is shown in figure 1. This figure shows that for crossing of phantom divided line, ω φ = −1, the lower value of m should be negative.…”

Section: Casementioning

confidence: 99%

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Crossing of the phantom divided barrier with Lorentz invariance violating fields

Sadatian

Nozari

2008

Europhys. Lett.

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We study possible crossing of the phantom divided barrier in a Lorentz invariance violating dark energy model. Lorentz invariance violation which is achieved by introducing a vector field in the action, incorporates directly in the dynamics of the scalar field and equation of state. This interesting feature allows us to study phantom divided barrier crossing in the context of Lorentz invariance violation. We show that for suitable choice of parameter space, equation of state can cross phantom divided barrier just by one scalar field and Lorentz violating vector field controls this crossing. : 95.36.+x; 98.80.Cq; PACS

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Section: Discussionmentioning

confidence: 98%

Section: Motivationmentioning

confidence: 99%

“…One can see that β 4 does not contribute to the background dynamics [1,2]. The energy equations for the vector field u and scalar field, φ are as follows…”

Section: (φ)mentioning

confidence: 99%

“…With these preliminaries, dynamics of the model is described by the following Friedmann equations [1,2] 1 + 1 8πGβ…”

Section: (φ)mentioning

confidence: 99%

Section: Casementioning

confidence: 99%

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Crossing of the phantom divided barrier with Lorentz invariance violating fields

Sadatian

Nozari

2008

Europhys. Lett.

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Modified gravitational equations on braneworld with Lorentz invariant violation

2009

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The modified gravitational equations to describe a four-dimensional braneworld in the case with the Lorentz invariant violation in a bulk spacetime is presented. It contains a trace part of the brane energy-momentum tensor and the coefficients of all terms describe the Lorentz violation effects from the bulk spacetime. As an application, we apply this formalism to study cosmology. In respect to standard effective Friedmann equations on the brane, Lorentz invariance violation in the bulk causes a modification of this equations that can lead to significant physical consequences. In particular, the effective Friedmann equation on the brane explicitly depends on the equation of state of the brane matter and the Lorentz violating parameters. We show that the components of five-dimensional Weyl curvature are related to the matter on brane even at low energies. We also find that the constraints on the theory parameters are depend on the equation of state of the energy components of 123 910 Arianto et al. the brane matter. Finally, the stability of the model depend on the specific choices of initial conditions and the parameters β i .

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Cosmological model with nonminimal derivative coupling of scalar fields in five dimensions

Suroso

Zen

2013

Gen Relativ Gravit

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We study a nonminimal derivative coupling (NMDC) of scalar field, where the scalar field is coupled to curvature tensor in the five dimensional universal extra dimension model. We apply the Einstein equation and find its solution. First, we consider a special case of pure free scalar field without NMDC and we find that for static extradimension, the solution is equivalent to the standard cosmology with stiff matter. For a general case of pure free scalar field with NMDC, we find that the de Sitter solution is the solution of our model. For this solution, the scalar field evolves linearly in time. In the limit of small Hubble parameter, the general case give us the same solution as in the pure free scalar field. Finally, we perform a dynamical analysis to determine the stability of our model. We find that the extradimension, if it exist, can not be static and always shrinks with the expansion of four dimensional spacetime.

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Some impacts of Lorentz violation on cosmology

Cited by 31 publications

References 49 publications

Crossing of the phantom divided barrier with Lorentz invariance violating fields

Crossing of the phantom divided barrier with Lorentz invariance violating fields

Modified gravitational equations on braneworld with Lorentz invariant violation

Cosmological model with nonminimal derivative coupling of scalar fields in five dimensions

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