Dynamical stability in scalar-tensor cosmology
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TL;DR: In this article, the authors study FRW cosmology for a double scalar -the tensor theory of gravity where two scalar fields are nonminimally coupled to the geometry.
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Abstract: We study FRW cosmology for a double scalar - tensor theory of gravity where two scalar fields are nonminimally coupled to the geometry. In a framework to study stability and attractor solutions of the model in the phase space, we constraint the model parameters with the observational data. For an accelerating universe, the model behaves like quintom dark energy models and predicts a transition from quintessence era to phantom era.
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Selected topics in scalar-tensor theories and beyond
TL;DR: In this paper, a review of the asymptotic dynamics of cosmological models based on the Brans-Dicke, scalar-tensor and Horndeski theories is presented.
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Brans-dicke chameleonic cosmology and cosmic evolution
Muhammad Sharif,Saira Waheed +1 more
TL;DR: In this paper, the authors studied the cosmic evolution in radiation and matter dominated epochs of the universe in chameleon Brans-Dicke (BD) as well as generalized Chameleon BD cosmology.
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Brans-Dicke cosmology does not have theCDM phase as an universal attractor
TL;DR: In this paper, it was shown that the de Sitter solution is an attractor of the Jordan frame (dilatonic) Brans-Dicke theory of gravity for self-interaction potentials.
Varying alpha and cosmic acceleration in Brans-Dicke-BSBM theory: stability analysis and observational tests
TL;DR: By integrating generalized BSBM and Brans-Dicke cosmological models, the theoretical framework of fine structure constant variation and current cosmic acceleration was investigated in this article, where the authors developed a mathematical formalism to analyse the stability of the model and examined the model against observational data such as observational Hubble parameter dataset and quasar absorption spectra.
Chameleon effect in the Jordan frame of the Brans-Dicke theory
TL;DR: In this paper, the authors investigated the chameleon effect in the different conformal frames of the Brans-Dicke (BD) theory and showed that, provided that the effective Chameleon potential has a minimum within a region of constant density of matter, the BD theory transmutes into general relativity with a cosmological constant, in that region.
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TL;DR: In this article, the authors used spectral and photometric observations of 10 Type Ia supernovae (SNe Ia) in the redshift range 0.16 " z " 0.62.
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
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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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First year Wilkinson Microwave Anisotropy Probe (WMAP) observations: Determination of cosmological parameters
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TL;DR: In this article, the authors find that the emerging standard model of cosmology, a flat -dominated universe seeded by a nearly scale-invariant adiabatic Gaussian fluctuations, fits the WMAP data.
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.
Type Ia supernova discoveries at z > 1 from the Hubble Space Telescope: Evidence for past deceleration and constraints on dark energy evolution
Adam G. Riess,Louis-Gregory Strolger,John L. Tonry,Stefano Casertano,Henry C. Ferguson,Bahram Mobasher,Peter Challis,Alexei V. Filippenko,Saurabh Jha,Weidong Li,Ryan Chornock,Robert P. Kirshner,Bruno Leibundgut,Mark Dickinson,Mario Livio,Mauro Giavalisco,Charles C. Steidel,Txitxo Benítez,Zlatan Tsvetanov +18 more
TL;DR: For a flat universe with a cosmological constant, the transition between the two epochs is constrained to be at z = 0.46 ± 0.13 as mentioned in this paper, and w = -1.02 ± (and w < -0.76 at the 95% confidence level) for an assumed static equation of state of dark energy.