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22 papers · 1 filter
Cylindrically Symmetric-Static Brans-Dicke-Maxwell Solutions
Ahmet Baykal, Ozgur Delice
We present static cylindrically symmetric electrovac solutions in the framework of the Brans-Dicke theory and show that our solution yields some of the well-known solutions for spe…
Brieskorn manifolds as contact branched covers of spheres
Ferit Ozturk, Klaus Niederkrüger
We show that Brieskorn manifolds with their standard contact structures are contact branched coverings of spheres. This covering maps a contact open book decomposition of the Bries…
Constraints on cosmological parameters through clusters XLF and XTF
A. Del Popolo, N. Ercan
In this paper, I revisit the constraints obtained by several authors (Reichart et al. 1999; Eke et al. 1998; Henry 2000) on the estimated values of , and in th…
Orbital migration and the period distribution of exoplanets
A. Del Popolo
We use the model for the migration of planets introduced in Del Popolo, Yesilyurt & Ercan (2003) to calculate the observed mass and semimajor axis distribution of extra-solar plane…
A theoretical study of the luminosity temperature relation for clusters of galaxies
A. Del Popolo, N. Hiotelis, J. Penarrubia
A luminosity-temperature relation for clusters of galaxies is derived. The two models used, take into account the angular momentum acquisition by the proto-structures during their…
Cosmological constraints from clustering properties of galaxy clusters
A. Del Popolo, N. Ercan, S. Yesilyurt
In this paper, we discuss improvements of the Suto et al. (2000) model, in the light of recent theoretical developments (new theoretical mass functions, a more accurate mass-temper…
On the reliability of merger-trees and the mass growth histories of dark matter haloes
N. Hiotelis, A. Del Popolo
We have used merger trees realizations to study the formation of dark matter haloes. The construction of merger-trees is based on three different pictures about the formation of st…
The Noether numbers for cyclic groups of prime order
P. Fleischmann, M. Sezer, R. J. Shank +1
The Noether number of a representation is the largest degree of an element in a minimal homogeneous generating set for the corresponding ring of invariants. We compute the Noether…
The Conformal Penrose Limit and the Resolution of the pp-curvature Singularities
R. Gueven
We consider the exact solutions of the supergravity theories in various dimensions in which the space-time has the form M_{d} x S^{D-d} where M_{d} is an Einstein space admitting a…
Comments on the possible discovery of the Higgs boson with mass ~ 160 GeV at the Tevatron
E. Arik, S. Sultansoy
The consequences of the possible discovery of the Higgs boson with a mass around 160 - 180 GeV at the Tevatron are discussed.
Dyonic Kerr-Newman black holes, complex scalar field and Cosmic Censorship
Ibrahim Semiz
We construct a gedanken experiment, in which a weak wave packet of the complex massive scalar field interacts with a four-parameter (mass, angular momentum, electric and magnetic c…
Schwarzschild-De Sitter black holes in 4+1 dimensional bulk
M. Arik, D. Ciftci
We construct a static solution for 4+1 dimensional bulk such that the 3+1 dimensional world has a linear warp factor and describes the Schwarzschild-dS_{4} black hole. For m=0 this…
Brane World Cosmology In Jordan-Brans-Dicke Theory
M. Arik, D. Ciftci
We consider the embedding of 3+1 dimensional cosmology in 4+1 dimensional Jordan-Brans-Dicke theory. We show that exponentially growing and power law scale factors are implied. Whe…
Multi-Hamiltonian structure of Plebanski's second heavenly equation
F. Neyzi, Y. Nutku, M. B. Sheftel
We show that Plebanski's second heavenly equation, when written as a first-order nonlinear evolutionary system, admits multi-Hamiltonian structure. Therefore by Magri's theorem it…
Can Brans-Dicke scalar field account for dark energy and dark matter?
M. Arik M. C. Calik
By using a linearized non-vacuum late time solution in Brans-Dicke cosmology we account for the seventy five percent dark energy contribution but not for approximately twenty-three…
Brane Gases and Stabilization of Shape Moduli with Momentum and Winding Stress
Ali Kaya
In a toy model with gases of membranes and strings wrapping over a two-dimensional internal torus, we study the stabilization problem for the shape modulus. It is observed that win…
Stabilization of Extra Dimensions and The Dimensionality of the Observed Space
Tonguç Rador
We present a simple model for the late time stabilization of extra dimensions. The basic idea is that brane solutions wrapped around extra dimensions, which is allowed by string th…
Linear Cosmological Perturbations in D-brane Gases
Ali Kaya
We consider linear cosmological perturbations on the background of a D-brane gas in which the compact dimensions and the dilaton are stabilized. We focus on long wavelength fluctua…
Intersection Democracy for Winding Branes and Stabilization of Extra Dimensions
Tonguç Rador
We show that, in the context of pure Einstein gravity, a democratic principle for intersection possibilities of branes winding around extra dimensions in a given partitioning yield…
Vibrating Winding Branes, Wrapping Democracy and Stabilization of Extra Dimensions in Dilaton Gravity
Tonguç Rador
We show that, in the context of dilaton gravity, a recently proposed democratic principle for intersection possibilities of branes winding around extra dimensions yield stabilizati…
Observability of the Higgs Boson in the Presence of Extra Standard Model Families at the Tevatron
E. Arik, O. Cakir, S. A. Cetin +1
The observability of the Higgs boson via the WW^* decay channel at the Tevatron is discussed taking into account the enhancements due to the possible existence of the extra standar…
Radiating Levi-Civita Spacetime
Ozgur Delice
This paper has been withdrawn by the author, See J.Krishna Rao, J. Phys. A: Gen. Phys., 4, 17 (1971) for radiating Levi-Civita metric.