99 citations
- Institute for Research in Fundamental SciencesIR12 papers
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- Centre National de la Recherche ScientifiqueFR2 papers
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16 papers · 1 filter
Energy conditions in f(R) gravity and Brans-Dicke theories
K. Atazadeh, A. Khaleghi, H. R. Sepangi +1
The equivalence between f(R) gravity and scalar-tensor theories is invoked to study the null, strong, weak and dominant energy conditions in Brans-Dicke theory. We consider the val…
On the notion of Cohen-Macaulayness for non Noetherian rings
Mohsen Asgharzadeh, Massoud Tousi
There exist many characterizations of Noetherian Cohen-Macaulay rings in the literature. These characterizations do not remain equivalent if we drop the Noetherian assumption. The…
Duality for a Cohen-Macaulay local ring
Mohammad Ali Esmkhani, Massoud Tousi
Let $(R,\fm)$ be a Cohen-Macaulay local ring. If has a canonical module, then there are some interesting results about duality for this situation. In this paper, we show that o…
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…
Graph Powers and Graph Homomorphisms
Hossein Hajiabolhassan, Ali Taherkhani
In this paper we investigate some basic properties of fractional powers. In this regard, we show that for any rational number , $G^{2r+1\over 2s+1}\l…
A Renormalized perturbation theory for problems with nontrivial boundary conditions or backgrounds in two space-time dimensions
Reza Moazzemi, Abdollah Mohammadi, Siamak S. Gousheh
In this paper we discuss the effects of nontrivial boundary conditions or backgrounds, including non-perturbative ones, on the renormalization program for systems in two dimensions…