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27 papers · 1 filter
Role of Chaplygin gas as geometrical dark energy in anisotropic brane gravity
Malihe Heydari-Fard, Hamid R. Sepangi
We consider an anisotropic brane-world model with Bianchi type I and V geometry, without mirror symmetry or any form of junction conditions. The generalized Chaplygin gas, which in…
Signature change from Schutz's canonical quantum cosmology and its classical analogue
P. Pedram, S. Jalalzadeh
We study the signature change in a perfect fluid Friedmann-Robertson-Walker quantum cosmological model. In this work the Schutz's variational formalism is applied to recover the no…
Variation of mass in primordial nucleosynthesis as a test of Induced Matter Brane Gravity
S. Jalalzadeh, A. M. Yazdani
The variation of mass in induced matter theory using Ceroch-Stewart-Walter perturbations of submanifolds [1] is redefined. It is shown that the deviation of primordial Helium produ…
Noether symmetry in cosmology
Babak Vakili
The Noether symmetry of a generic cosmological model is investigated by utilizing the behavior of the corresponding Lagrangian under the infinitesimal generators of the desi…
Dilaton Cosmology, Noncommutativity and Generalized Uncertainty Principle
Babak Vakili
The effects of noncommutativity and of the existence of a minimal length on the phase space of a dilatonic cosmological model are investigated. The existence of a minimum length, r…
Accelerating universe in brane gravity
K. Atazadeh, M. Farhoudi, H. R. Sepangi
We study a 5-dimensional brane gravity within the framework of scalar-tensor type theories. We show that such a model predicts, for a certain choice of …