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13 papers · 1 filter
Generalized second law in phantom dominated universe
H. Mohseni Sadjadi
We study the conditions of validity of generalized second law in phantom dominated era.
On the associated primes of generalized local cohomology modules
Amir Mafi
Let $\fa$ be an ideal of a commutative Noetherian ring with identity and let and be two finitely generated -modules. Let be a positive integer. It is shown that…
Topology, Mass and Casimir energy
N. Ahmadi, M. Nouri-Zonoz
The vacuum expectation value of the stress energy tensor for a massive scalar field with arbitrary coupling in flat spaces with non-trivial topology is discussed. We calculate the…
Finiteness of extension functors of local cohomology modules
Mohammad T. Dibaei, Siamak Yassemi
Let be a commutative Noetherian ring, $\fa$ an ideal of and a finitely generated --module. Let be a non-negative integer such that $\H^i_\fa(M)$ is $\fa$--cofini…
Large-N behavior of the Wilson loops of generalized two-dimensional Yang-Mills theories
M. Khorrami, M. Alimohammadi
The large-N limit of the expectation values of the Wilson loops corresponding to two-dimensional U(N) Yang-Mills and generalized Yang-Mills theories on a sphere are studied. The be…
Morgan-Morgan-NUT disk space via the Ehlers transformation
D. Momeni, M. Nouri-Zonoz, R. Ramazani-Arani
Using the Ehlers transformation along with the gravitoelectromagnetic approach to stationary spacetimes we start from the Morgan-Morgan disk spacetime (without radial pressure) as…