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16 papers · 1 filter
S-duality in String Gas Cosmology
S. Arapoglu, A. Karakci, A. Kaya
We consider a toy cosmological model in string theory involving the winding and momentum modes of (m,n) strings, i.e. bound states of m fundamental and n D-strings. The model is in…
Community Detection in Complex Networks Using Agents
Ismail Gunes, Haluk Bingol
Community structure identification has been one of the most popular research areas in recent years due to its applicability to the wide scale of disciplines. To detect communities…
Cylindrically symmetric, static strings with a cosmological constant in Brans-Dicke theory
Ozgur Delice
The static, cylindrically symmetric vacuum solutions with a cosmological constant in the framework of the Brans-Dicke theory are investigated. Some of these solutions admitting Lor…
Local cosmic strings in Brans-Dicke theory with a cosmological constant
Ozgur Delice
It is known that Vilenkin's phenomenological equation of state for static straight cosmic strings is inconsistent with Brans-Dicke theory. We will prove that, in the presence of a…
Gravitational collapse and non-self similarity in the L-T relation
A. Del Popolo
We derive the luminosity-temperature relation for clusters of galaxies by means of a modification of the self-similar model to take account of angular momentum acquisition by proto…
On the cosmological mass function theory
A. Del Popolo
This paper provides, from one side, a review of the theory of the cosmological mass function from a theoretical point of view, starting from the seminal paper of Press & Shechter (…