Cosmological Models With Negative Constant Deceleration Parameter In Lyra Geometry

Rahaman, Farook; Begum, Naheed; Bag, G.; Bhui, B.

doi:10.1007/s10509-005-5943-4

Cited by 55 publications

(35 citation statements)

References 12 publications

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“…In literature Berman (1983), Berman and Gomide (1988), Maharaj and Naidoo (1993), Johri and Desikan (1994), Singh and Desikan (1997), Pradhan and Vishwakarma (2002), Rahaman et al (2005) and others have considered cosmological models with constant DP. Recently Reddy et al (2006Reddy et al ( , 2007 have presented LRS Bianchi type-I models with constant DP in scalar tensor and scale covariant theories of gravitation.…”

Section: Law Of Variation For Hubble's Parametermentioning

confidence: 99%

Anisotropic Bianchi type-I models with constant deceleration parameter in general relativity

Kumar

Singh

2007

Astrophys Space Sci

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A special law of variation for Hubble's parameter is presented in a spatially homogeneous and anisotropic Bianchi type-I space-time that yields a constant value of deceleration parameter. Using the law of variation for Hubble's parameter, exact solutions of Einstein's field equations are obtained for Bianchi-I space-time filled with perfect fluid in two different cases where the universe exhibits powerlaw and exponential expansion. It is found that the solutions are consistent with the recent observations of type Ia supernovae. A detailed study of physical and kinematical properties of the models is carried out.

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Section: Law Of Variation For Hubble's Parametermentioning

confidence: 99%

Anisotropic Bianchi type-I models with constant deceleration parameter in general relativity

Kumar

Singh

2007

Astrophys Space Sci

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“…It is interesting to mention here that this equation of state comes naturally in our case where as Reddy (2003aReddy ( , 2003b and Reddy andRao (2006a, 2006b) imposed it to obtain cosmological models in four-dimensional case.…”

Section: Discussionmentioning

confidence: 91%

“…Moreover they revealed that the model for geometric string does not exist under polynomial relationship between the metric coefficients. Bhamra (1974), Karade and Borikar (1978), Kalyanshetti and Waghmode (1982), Beesham (1986Beesham ( , 1988, Singh (1991, 1993), Singh et al (2004), Rahaman and Bera (2001), Rahaman et al (2002Rahaman et al ( , 2003bRahaman et al ( , 2003cRahaman et al ( , 2005, Casana et al (2005), Reddy andRao (2006a, 2006b) and Mohanty et al (2006Mohanty et al ( , 2007 are some of the authors who constructed various cosmological models in Lyra manifold.…”

Section: Introductionmentioning

confidence: 99%

Five-dimensional axially symmetric string cosmological model in Lyra manifold

Mohanty

Mahanta

2007

Astrophys Space Sci

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In this paper we constructed five dimensional axially symmetric cosmological model generated by a cloud of strings with particles attached to them in Lyra manifold. Out of the two different cases obtained one case leads to the five dimensional vacuum universe in general theory of relativity while the other case yields a string cosmological model in Lyra manifold. In the cosmic string model we observed that the sum of tension density and rest energy density of strings vanishes and this model is also inflationary.

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“…Old measurements point to the current value of q as being 1 which means an approximately non-expanding Universe [37]. However new data aims to a negative value of q, this is taken as an indication of the existence of dark energy [40][41][42]. Let's see the predictions of Eq.…”

Section: The Flat Universe Casementioning

confidence: 99%

On dark energy and accelerated reference frames

Ulhoa

2012

Annalen der Physik

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The paper is devoted to an explanation of the accelerated rate of expansion of the Universe. Usually the acceleration of the Universe, which is described by FRW metric, is due to dark energy. It is shown that this effect may be considered as a manifestation of torsion tensor for a flat Universe in the realm of Teleparallel gravity. An observer with radial field velocity obey Hubble's Law. As a consequence it is established that this is radial acceleration in a flat Universe. In Eq. (35) the acceleration is written in terms of the deceleration parameter, the Hubble’s constant and the proper distance. This may be interpreted as an acceleration of the Universe.

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Cosmological Models With Negative Constant Deceleration Parameter In Lyra Geometry

Cited by 55 publications

References 12 publications

Anisotropic Bianchi type-I models with constant deceleration parameter in general relativity

Anisotropic Bianchi type-I models with constant deceleration parameter in general relativity

Five-dimensional axially symmetric string cosmological model in Lyra manifold

On dark energy and accelerated reference frames

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