154 citations
- Institute for Research in Fundamental SciencesIR12 papers
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13 papers · 1 filter
Cosmological constant influence on cosmic string spacetime
Amir H. Abbassi, Amir M. Abbassi
We investigate the line element of spacetime around a linear cosmic string in the presence of a cosmological constant. We obtain the metric and argue that it should be discarded be…
Geodesic Congruences in the Palatini f(R) Theory
Fatimah Shojai, Ali Shojai
We shall investigate the properties of a congruence of geodesics in the framework of Palatini f(R) theories. We shall evaluate the modified geodesic deviation equation and the Rayc…
Cross-Layer Link Adaptation Design for Relay Channels with Cooperative ARQ Protocol
Morteza Mardani, Jalil S. Harsini, Farshad Lahouti
The cooperative automatic repeat request (C-ARQ) is a link layer relaying protocol which exploits the spatial diversity and allows the relay node to retransmit the source data pack…
Towards a three dimensional solution for 3N bound states with 3NFs
M. R. Hadizadeh, S. Bayegan
After a brief discussion about the necessity of using the 3D approach, we present the non PW formalism for 3N bound state with the inclusion of 3N force (3NF). As an example the ev…
Cylindrical solutions in metric f(R) gravity
A. Azadi, D. Momeni, M. Nouri-Zonoz
We study static cylindrically symmetric vacuum solutions in Weyl coordinates in the context of the metric f(R) theories of gravity. The set of the modified Einstein equations is re…
Betti numbers of transversal monomial ideals
Rahim Zaare-Nahandi
In this paper, by a modification of a previously constructed minimal free resolution for a transversal monomial ideal, the Betti numbers of this ideal is explicitly computed. For c…