Journal ArticleDOI
Generalized Chaplygin gas and cosmic microwave background radiation constraints
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In this paper, the dependence of the location of the cosmic microwave background radiation peaks on the parameters of the generalized Chaplygin gas model was studied, and it was shown that observational data arising from Archeops, BOOMERANG, supernova and high-redshift observations allow constraining significantly the parameter space of the model.Abstract:
We study the dependence of the location of the cosmic microwave background radiation peaks on the parameters of the generalized Chaplygin gas model, whose equation of state is given by $p=\ensuremath{-}A/{\ensuremath{\rho}}^{\ensuremath{\alpha}},$ where A is a positive constant and $0l\ensuremath{\alpha}l~1.$ We find, in particular, that observational data arising from Archeops, BOOMERANG, supernova and high-redshift observations allow constraining significantly the parameter space of the model. Our analysis indicates that the emerging model is clearly distinguishable from the $\ensuremath{\alpha}=1$ Chaplygin case and the $\ensuremath{\Lambda}\mathrm{CDM}$ model.read more
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Dynamics of dark energy
TL;DR: In this article, the authors review the observational evidence for the current accelerated expansion of the universe and present a number of dark energy models in addition to the conventional cosmological constant, paying particular attention to scalar field models such as quintessence, K-essence and tachyon.
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Dark Energy
TL;DR: A survey of theoretical models and some aspects of numerical studies for dark energy can be found in this paper, where the authors review the problem of dark energy, including a survey of the theoretical models.
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Quintom Cosmology: theoretical implications and observations
TL;DR: In this paper, a no-go theorem existing in quintom cosmology is introduced, and based on it, conditions for the equation of state of dark energy realizing the quintom scenario are discussed.
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Reconciling dark energy models with f(R) theories
TL;DR: In this article, a third order linear differential equation for the Ricci scalar curvature entering the gravity Lagrangian and determining the dynamics of the universe was derived from the cosmological data.
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Observational constraints on dark energy with generalized equations of state
TL;DR: In this article, the effects of viscosity terms depending on the Hubble parameter and its derivatives in the dark energy equation of state were investigated for two classes of models whose singularities in the early and late time universe have been studied by testing the models against the dimensionless coordinate distance to Type Ia Supernovae and radio galaxies also including priors on the shift and acoustic peak parameters.
References
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Observational Evidence from Supernovae for an Accelerating Universe and a Cosmological Constant
Adam G. Riess,Alexei V. Filippenko,Peter Challis,Alejandro Clocchiatti,Alan H. Diercks,Peter M. Garnavich,R. L. Gilliland,Craig J. Hogan,Saurabh Jha,Robert P. Kirshner,Bruno Leibundgut,Mark M. Phillips,David J Reiss,Brian P. Schmidt,R. A. Schommer,R. Chris Smith,R. Chris Smith,Jason Spyromilio,Christopher W. Stubbs,Nicholas B. Suntzeff,John L. Tonry +20 more
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Journal ArticleDOI
Observational Evidence from Supernovae for an Accelerating Universe and a Cosmological Constant
Adam G. Riess,Alexei V. Filippenko,Peter Challis,Alejandro Clocchiattia,Alan H. Diercks,Peter M. Garnavich,R. L. Gilliland,Craig J. Hogan,Saurabh Jha,Robert P. Kirshner,Bruno Leibundgut,Mark M. Phillips,David J Reiss,Brian P. Schmidt,Robert A. Schommer,R. Chris Smith,Jason Spyromilio,Christopher W. Stubbs,Nicholas B. Suntzeff,John L. Tonry +19 more
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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.
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Cosmological Consequences of a Rolling Homogeneous Scalar Field
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Cosmological imprint of an energy component with general equation of state
TL;DR: In this article, the authors examine the possibility that a significant component of the energy density of the universe has an equation of state different from that of matter, radiation, or cosmological constant.
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