The Role of Dark Matter and Dark Energy in Cosmological Models: Theoretical Overview

Capozziello, Salvatore; Paolis, F. De; Ingrosso, G.; Nucita, A. A.

doi:10.1007/978-1-4419-1362-3_22

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Journal Of Astrophysics1

Weak Energy Limit1

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2013

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Cited by 1 publication

(2 citation statements)

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“…We therefore need two more assumptions to extract exact solution for the system. One of these may be set by separating the condition (74), so that cosmic evolution, that is, the solution of , becomes field independent and depends only on the form of ( ) chosen by hand, as before. Thus, we separate the condition (74) for the existence of the conserved current as…”

Section: Journal Of Astrophysicsmentioning

confidence: 99%

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Field Independent Cosmic Evolution

Sanyal

2013

Journal of Astrophysics

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It has been shown earlier that Noether symmetry does not admit a form of ( ) corresponding to an action in which ( ) is coupled to scalar-tensor theory of gravity or even for pure ( ) theory of gravity taking anisotropic model into account. Here, we prove that ( ) theory of gravity does not admit Noether symmetry even if it is coupled to tachyonic field and considering a gauge in addition. To handle such a theory, a general conserved current has been constructed under a condition which decouples higherorder curvature part from the field part. This condition, in principle, solves for the scale-factor independently. Thus, cosmological evolution remains independent of the form of the chosen field, whether it is a scalar or a tachyon.

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Section: Journal Of Astrophysicsmentioning

confidence: 99%

“…Indeed, it is true that solar system puts up severe constraints on alternative theories of gravity [73,74]. For an action…”

Section: Weak Energy Limitmentioning

confidence: 99%