Baryon acoustic oscillations and dynamical dark energy
TLDR
In this article, the impact of dark energy at last scattering on measurements of baryon acoustic oscillations (BAOs) was investigated and it was shown that an early dark energy component can contribute a systematic uncertainty to BAO measurements of up to 2.5%.Abstract:
We compute the impact of dark energy at last scattering on measurements of baryon acoustic oscillations (BAOs). We show that an early dark energy component can contribute a systematic uncertainty to BAO measurements of up to 2.5%. Whilst this effect turns out to only slightly affect current BAO surveys, the results of future BAO surveys might become biased. We find that BAO surveys alone appear unable to resolve this systematic uncertainty, so supplementary measurements are necessary.read more
Citations
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Journal ArticleDOI
Mapping the cosmological expansion
TL;DR: A wide range of tools, challenges and physical interpretations have been proposed to map the cosmological expansion as discussed by the authors, including direct measures of cosmic scales through Type Ia supernova luminosity distances, and angular distance scales of baryon acoustic oscillation and cosmic microwave background density perturbations, as well as indirect probes such as the effect of cosmic expansion on the growth of matter density fluctuations.
Journal ArticleDOI
The Beginning and Evolution of the Universe
Bharat Ratra,Michael S. Vogeley +1 more
TL;DR: The current standard model for the evolution of the universe from an early inflationary epoch to the complex hierarchy of structure seen today has been reviewed in this article, where the authors summarize and provide key references for the following topics.
Journal ArticleDOI
The Beginning and Evolution of the Universe
Bharat Ratra,Michael S. Vogeley +1 more
TL;DR: The current standard model for the evolution of the universe from an early inflationary epoch to the complex hierarchy of structure seen today has been reviewed in this article, with a discussion of some open questions in cosmology.
Journal ArticleDOI
Observational constraints on late-time Lambda(t) cosmology
TL;DR: In this article, the authors study cosmological consequences of a scenario driven by a varying cosmology term, in which the vacuum energy density decays linearly with the Hubble parameter, {proportional_to}H.
Journal ArticleDOI
Cosmic dissonance: new physics or systematics behind a short sound horizon?
Nikki Arendse,Radosław Wojtak,Adriano Agnello,Geoff C. F. Chen,Christopher D. Fassnacht,Dominique Sluse,Stefan Hilbert,M. Millon,Vivien Bonvin,Kenneth C. Wong,Frederic Courbin,Sherry H. Suyu,Simon Birrer,Tommaso Treu,Léon V. E. Koopmans +14 more
TL;DR: In this article, the Baryon Acoustic Oscillations (BAO) and Type Ia supernovae with combinations of the distance indicators were used to obtain a joint and self-consistent measurement of the Hubble constant and sound horizon at low redshift, independent of cosmological models and CMB inference.
References
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Journal ArticleDOI
Detection of the baryon acoustic peak in the large-scale correlation function of SDSS luminous red galaxies
Daniel J. Eisenstein,Daniel J. Eisenstein,Idit Zehavi,David W. Hogg,Roman Scoccimarro,Michael R. Blanton,Robert C. Nichol,Ryan Scranton,Hee-Jong Seo,Max Tegmark,Max Tegmark,Zheng Zheng,Scott F. Anderson,James Annis,Neta A. Bahcall,Jon Brinkmann,Scott Burles,Francisco J. Castander,Andrew J. Connolly,István Csabai,Mamoru Doi,Masataka Fukugita,Joshua A. Frieman,Joshua A. Frieman,Karl Glazebrook,James E. Gunn,John S. Hendry,Greg Hennessy,Zeljko Ivezic,Stephen M. Kent,Gillian R. Knapp,Huan Lin,Yeong Shang Loh,Robert H. Lupton,Bruce Margon,Timothy A. McKay,Avery Meiksin,Jeffrey A. Munn,Adrian Pope,Michael W. Richmond,David J. Schlegel,Donald P. Schneider,Kazuhiro Shimasaku,Chris Stoughton,Michael A. Strauss,Mark SubbaRao,Mark SubbaRao,Alexander S. Szalay,István Szapudi,Douglas L. Tucker,Brian Yanny,Donald G. York +51 more
TL;DR: In this paper, a large-scale correlation function measured from a spectroscopic sample of 46,748 luminous red galaxies from the Sloan Digital Sky Survey is presented, which demonstrates the linear growth of structure by gravitational instability between z ≈ 1000 and the present and confirms a firm prediction of the standard cosmological theory.
Journal ArticleDOI
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.
Journal ArticleDOI
Cosmological Consequences of a Rolling Homogeneous Scalar Field
Bharat Ratra,P. J. E. Peebles +1 more
TL;DR: It is argued that a number of models in which the energy density of the scalar field red-shifts in a specific manner are studied could reconcile the low dynamical estimates of the mean mass density with the negligibly small spatial curvature preferred by inflation.
Journal ArticleDOI
Cosmological parameters from SDSS and WMAP
Max Tegmark,Max Tegmark,Michael A. Strauss,Michael R. Blanton,Kevork N. Abazajian,Scott Dodelson,Scott Dodelson,Håvard B. Sandvik,Xiaomin Wang,David H. Weinberg,Idit Zehavi,Neta A. Bahcall,Fiona Hoyle,David J. Schlegel,Roman Scoccimarro,Michael S. Vogeley,Andreas A. Berlind,Tamás Budavári,Andrew J. Connolly,Daniel J. Eisenstein,Douglas P. Finkbeiner,Joshua A. Frieman,Joshua A. Frieman,James E. Gunn,Lam Hui,Bhuvnesh Jain,David Johnston,David Johnston,Stephen M. Kent,Huan Lin,Reiko Nakajima,Robert C. Nichol,Jeremiah P. Ostriker,Adrian Pope,Ryan Scranton,Uroš Seljak,Ravi K. Sheth,Albert Stebbins,Alexander S. Szalay,István Szapudi,Yongzhong Xu,James Annis,Jon Brinkmann,Scott Burles,Francisco J. Castander,István Csabai,Jon Loveday,Mamoru Doi,Masataka Fukugita,Bruce Gillespie,Greg Hennessy,David W. Hogg,Željko Ivezić,Gillian R. Knapp,D. Q. Lamb,Brian C. Lee,Robert H. Lupton,Timothy A. McKay,Peter Z. Kunszt,Jeffrey A. Munn,Liam O'Connell,John Peoples,Jeffrey R. Pier,Michael Richmond,Constance M. Rockosi,Donald P. Schneider,Christopher Stoughton,Douglas L. Tucker,Daniel E. Vanden Berk,Brian Yanny,Donald G. York +70 more
TL;DR: In this paper, the authors measured cosmological parameters using the three-dimensional power spectrum P(k) from over 200,000 galaxies in the Sloan Digital Sky Survey (SDSS) in combination with WMAP and other data.
Journal ArticleDOI
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,Narciso Benítez,Zlatan Tsvetanov +18 more
TL;DR: In this article, the first conclusive evidence for cosmic deceleration that preceded the current epoch of cosmic acceleration was provided by the discovery of 16 Type Ia supernovae with the Hubble Space Telescope (HST).
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