FRW Bulk Viscous Cosmology with Modified Chaplygin Gas in Flat Space
Hassan Saadat,Behnam Pourhassan +1 more
Reads0
Chats0
TLDR
In this article, the authors study FRW bulk viscous cosmology in the presence of modified Chaplygin gas and obtain time-dependent energy density for the special case of flat space.Abstract:
In this paper we study FRW bulk viscous cosmology in presence of modified Chaplygin gas. We write modified Friedmann equations due to bulk viscosity and Chaplygin gas and obtain time-dependent energy density for the special case of flat space.read more
Citations
More filters
Journal ArticleDOI
Viscous modified cosmic chaplygin gas cosmology
TL;DR: In this paper, a viscous modified cosmic Chaplygin gas as a model of dark energy was constructed using exponential function method to solve nonlinear equation and obtain time-dependent dark energy density.
Journal ArticleDOI
FRW bulk viscous cosmology with modified cosmic Chaplygin gas
Hassan Saadat,Behnam Pourhassan +1 more
TL;DR: In this paper, the generalized Friedmann equations due to bulk viscosity and modified cosmic Chaplygin gas were obtained, and the time-dependent energy density and the Hubble expansion parameter were discussed.
Journal ArticleDOI
Viscous Generalized Chaplygin Gas with Arbitrary α
Ali R. Amani,Behnam Pourhassan +1 more
TL;DR: In this paper, the generalized Chaplygin gas has viscosity for the case of arbitrary α and the authors obtained modified time-dependent energy density due to bulk visco-bregman viscosities and generalized Chapleygin gas, and plotted it with respect to time by different α.
Journal ArticleDOI
Higher order corrections of the extended Chaplygin gas cosmology with varying G and \Lambda
TL;DR: In this paper, two different models of dark energy based on the Chaplygin gas equation of state were studied, one of which is the variable modified version of the model and the other one is the extended version.
Journal ArticleDOI
Effect of Varying Bulk Viscosity on Generalized Chaplygin Gas
Hassan Saadat,Behnam Pourhassan +1 more
TL;DR: In this paper, the authors considered viscous generalized Chaplygin gas as a model of dark energy and found that the viscous generalization of the generalization corresponds to modified Chaplykin gas.
References
More filters
Journal ArticleDOI
Measurements of Omega and Lambda from 42 High-Redshift Supernovae
Saul Perlmutter,Saul Perlmutter,Greg Aldering,Gerson Goldhaber,Gerson Goldhaber,R. A. Knop,Peter Nugent,P. G. Castro,P. G. Castro,Susana E. Deustua,Sebastien Fabbro,Sebastien Fabbro,A. Goobar,A. Goobar,Donald E. Groom,I. M. Hook,I. M. Hook,A. G. Kim,A. G. Kim,A. G. Kim,M. Y. Kim,Julia C. Lee,Julia C. Lee,Nelson J. Nunes,Nelson J. Nunes,Reynald Pain,Reynald Pain,C. R. Pennypacker,C. R. Pennypacker,Robert Quimby,Christopher Lidman,Richard S. Ellis,Mike Irwin,Richard G. McMahon,Pilar Ruiz-Lapuente,Nicholas A. Walton,Bradley E. Schaefer,B. J. Boyle,Alexei V. Filippenko,Thomas Matheson,A. S. Fruchter,Nino Panagia,Nino Panagia,Heidi Jo Newberg,Warrick J. Couch +44 more
TL;DR: In this paper, the mass density, Omega_M, and cosmological-constant energy density of the universe were measured using the analysis of 42 Type Ia supernovae discovered by the Supernova Cosmology project.
Observational Evidence from Supernovae for an Accelerating Universe and a Cosmological Constant To Appear in the Astronomical Journal
Adam G. Riess,Alexei V. Filippenko,Peter Challis,A. Clocchiatti,Alan H. Diercks,R. L. Gilliland,Craig J. Hogan,Saurabh Jha,Robert P. Kirshner,Bruno Leibundgut,David J Reiss,Brian P. Schmidt,Robert A. Schommer,R. Chris Smith,Jason Spyromilio,Christopher W. Stubbs,Nicholas B. Suntzeff,John L. Tonry +17 more
TL;DR: The spectral and photometric observations of 10 type Ia supernovae (SNe Ia) in the redshift range 0.16 � z � 0.62 were presented in this paper.
Journal ArticleDOI
The Cosmological Constant Problem
TL;DR: In this article, five different approaches to the cosmological constant problem are described, and a brief review of the history of this problem is given. But none of the approaches are considered in this paper.
Journal ArticleDOI
First year Wilkinson Microwave Anisotropy Probe (WMAP) observations: Preliminary maps and basic results
Charles L. Bennett,Mark Halpern,Gary Hinshaw,N. Jarosik,Alan J. Kogut,Michele Limon,Michele Limon,S. S. Meyer,Lyman A. Page,David N. Spergel,Gregory S. Tucker,Gregory S. Tucker,Gregory S. Tucker,Edward J. Wollack,Edward L. Wright,Cris W. Barnes,M. R. Greason,Robert S. Hill,Eiichiro Komatsu,M. R. Nolta,N. Odegard,Hiranya V. Peiris,Licia Verde,Janet Weiland +23 more
TL;DR: In this paper, the authors present full sky microwave maps in five frequency bands (23 to 94 GHz) from the WMAP first year sky survey, which are consistent with the 7 in. full-width at half-maximum (FWHM) Cosmic Background Explorer (COBE) maps.
Journal ArticleDOI
The Cosmological Constant and Dark Energy
P. J. E. Peebles,Bharat Ratra +1 more
TL;DR: A review of dark energy can be found in this paper, where the authors present the basic physics and astronomy of the subject, reviews the history of ideas, assesses the state of the observational evidence, and comments on recent developments in the search for a fundamental theory.