S. M. M. Rasouli

Publications (5)2.91 Total impact

• Article: A class of cosmological solutions in induced matter theory with conformally flat bulk space

  N. Doroud, S. M. M. Rasouli, S. Jalalzadeh
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  ABSTRACT: Some solutions of 5D conformally flat extension of induced-matter theory are derived. The corresponding induced matter solutions on the 4D hypersurfaces and their properties are presented.
  General Relativity and Gravitation 04/2012; 41(11):2637-2656. · 2.07 Impact Factor
• Source

  Available from: ArXiv

  Article: Anisotropic Cosmological Model in Modified Brans--Dicke Theory

  S. M. M. Rasouli, Mehrdad Farhoudi, Hamid R. Sepangi
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  ABSTRACT: It has been shown that four dimensional Brans-Dicke theory with effective matter field and self interacting potential can be achieved from vacuum 5D BD field equations, where we refer to as modified Brans-Dicke theory (MBDT). We investigate a generalized Bianchi type I anisotropic cosmology in 5D BD theory, and by employing obtained formalism, we derive induced-matter on any 4D hypersurface in context of the MBDT. We illustrate that if the usual spatial scale factors are functions of time while scale factor of extra dimension is constant, and scalar field depends on time and fifth coordinate, then in general, one will encounter inconsistencies in field equations. Then, we assume the scale factors and scalar field depend on time and extra coordinate as separated variables in power law forms. Hence, we find a few classes of solutions in 5D spacetime through which, we probe the one which leads to a generalized Kasner relations among Kasner parameters. The induced scalar potential is found to be in power law or in logarithmic form, however, for constant scaler field and even when scalar field only depends on fifth coordinate, it vanishes. The conservation law is indeed valid in this MBDT approach for derived induced energy momentum tensor (EMT). We proceed our investigations for a few cosmological quantities, where for simplicity we assume metric and scalar field are functions of time. Hence, the EMT satisfies barotropic equation of state, and the model indicates that constant mean Hubble parameter is not allowed. Thus, by appealing to variation of Hubble parameter, we assume a fixed deceleration parameter, and set evolution of quantities with respect to the fixed deceleration, BD coupling and state parameters. The WEC allows a shrinking extra dimension for decelerating expanding universe that, in the constant scalar field, evolves same as flat FRW spacetime in GR.
  05/2011;
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  Available from: ArXiv

  Article: Horizon Problem Remediation via Deformed Phase Space

  S. M. M. Rasouli, Mehrdad Farhoudi, Nima Khosravi
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  ABSTRACT: We investigate the effects of a special kind of dynamical deformation between the momenta of the scalar field of the Brans-Dicke theory and the scale factor of the FRW metric. This special choice of deformation includes linearly a deformation parameter. We trace the deformation footprints in the cosmological equations of motion when the BD coupling parameter goes to infinity. One class of the solutions gives a constant scale factor in the late time that confirms the previous result obtained via another approach in the literature. This effect can be interpreted as a quantum gravity footprint in the coarse grained explanation. The another class of the solutions removes the big bang singularity, and the accelerating expansion region has an infinite temporal range which overcomes the horizon problem. After this epoch, there is a graceful exiting by which the universe enters in the radiation dominated era.
  06/2010;
• Article: On the energy conditions in non‐compact Kaluza‐Klein gravity

  S.M.M. Rasouli, S. Jalalzadeh
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  ABSTRACT: We investigate a few cosmological solutions in non-compact five-dimensional space-time which is both Ricci-flat and conformally flat. We then study the reduced solutions on the brane in detail by applying the four energy conditions, which categorize our model in some classes. These classes of solutions can describe the universe including accelerating expansion with either abnormal matter (when matter specifically violates the strong energy condition, it is called abnormal) or a phantom model of dark energy and a Stephani universe which is dominated by abnormal matter describing vacuum energy.
  Annalen der Physik 03/2010; 19(3‐5):276 - 280. · 0.84 Impact Factor
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  Available from: ArXiv

  Article: Quantum mechanics and geodesic deviation in the brane world

  S. M. M. Rasouli, A. F. Bahrehbakhsh, S. Jalalzadeh, M. Farhoudi
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  ABSTRACT: We investigate the induced geodesic deviation equations in the brane world models, in which all the matter forces except gravity are confined on the 3-brane. Also, the Newtonian limit of induced geodesic deviation equation is studied. We show that in the first Randall-Sundrum model the Bohr-Sommerfeld quantization rule is as a result of consistency between the geodesic and geodesic deviation equations. This indicates that the path of test particle is made up of integral multiples of a fundamental Compton-type unit of length $h/mc$. Comment: 5 pages, no figures
  11/2009;