Journal ArticleDOI
Dynamics of dark energy
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TLDR
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.Abstract:
We review in detail a number of approaches that have been adopted to try and explain the remarkable observation of our accelerating universe. In particular we discuss the arguments for and recent progress made towards understanding the nature of dark energy. We 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, tachyon, phantom and dilatonic models. The importance of cosmological scaling solutions is emphasized when studying the dynamical system of scalar fields including coupled dark energy. We study the evolution of cosmological perturbations allowing us to confront them with the observation of the Cosmic Microwave Background and Large Scale Structure and demonstrate how it is possible in principle to reconstruct the equation of state of dark energy by also using Supernovae Ia observational data. We also discuss in detail the nature of tracking solutions in cosmology, particle physics and braneworld models of dark energy, the nature of possible future singularities, the effect of higher order curvature terms to avoid a Big Rip singularity, and approaches to modifying gravity which leads to a late-time accelerated expansion without recourse to a new form of dark energy.read more
Citations
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Journal ArticleDOI
Constraining dark energy anisotropic stress
TL;DR: In this paper, a general parametrization of the dark energy component accounting for an equation of state, speed of sound and viscosity was proposed to investigate the possibility of using cosmological observations to probe and constrain an imperfect dark energy fluid.
Journal ArticleDOI
Modelling Redshift Space Distortions in Hierarchical Cosmologies
TL;DR: Galaxy redshift surveys allow us to study the 3D spatial distribution of galaxies and clusters and provide accurate radial distances for galaxies in a homogeneous universe as discussed by the authors, however, peculiar velocities are gravitationally induced by inhomogeneous structure and distort the measured distances.
Journal ArticleDOI
Effective field theory of dark energy: A review
TL;DR: The effective field theory of dark energy as mentioned in this paper is based on a Lagrangian description of cosmological perturbations which depends on a number of functions of time, some of which are non-minimal couplings representing genuine deviations from General Relativity.
Journal ArticleDOI
Dark energy from a quintessence (phantom) field rolling near a potential minimum (maximum)
TL;DR: In this paper, the authors examined dark-energy models in which a quintessence or a phantom field rolls near the vicinity of a local minimum or maximum, respectively, of its potential.
Journal ArticleDOI
First-year Sloan Digital Sky Survey-II supernova results: consistency and constraints with other intermediate-redshift data sets
Hubert Lampeitl,Robert C. Nichol,Hee-Jong Seo,Tommaso Giannantonio,Tommaso Giannantonio,C. Shapiro,Bruce A. Bassett,Will J. Percival,Tamara M. Davis,Tamara M. Davis,B. Dilday,Joshua A. Frieman,Joshua A. Frieman,Peter M. Garnavich,M. Sako,Mathew Smith,Mathew Smith,Jesper Sollerman,Jesper Sollerman,A. C. Becker,D. Cinabro,Alexei V. Filippenko,Ryan J. Foley,Ryan J. Foley,Craig J. Hogan,Jon A. Holtzman,Saurabh Jha,Kohki Konishi,John Marriner,Michael Richmond,Adam G. Riess,Adam G. Riess,Donald P. Schneider,Maximilian Stritzinger,Maximilian Stritzinger,K. J. van der Heyden,Jacob T VanderPlas,John C Wheeler,Chen Zheng +38 more
TL;DR: In this paper, the luminosity distances of Type Ia supernovae from the Sloan Digital Sky Survey-II (SDSS-II) SN Survey in conjunction with other intermediate-redshift (z 97 per cent level from this single data set) were analyzed.
References
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A new look at the statistical model identification
TL;DR: In this article, a new estimate minimum information theoretical criterion estimate (MAICE) is introduced for the purpose of statistical identification, which is free from the ambiguities inherent in the application of conventional hypothesis testing procedure.
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Estimating the Dimension of a Model
TL;DR: In this paper, the problem of selecting one of a number of models of different dimensions is treated by finding its Bayes solution, and evaluating the leading terms of its asymptotic expansion.
Estimating the dimension of a model
TL;DR: In this paper, the problem of selecting one of a number of models of different dimensions is treated by finding its Bayes solution, and evaluating the leading terms of its asymptotic expansion.
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.
Journal ArticleDOI
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
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.
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