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
TLDR
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.Abstract:
We have discovered 16 Type Ia supernovae (SNe Ia) with the Hubble Space Telescope (HST) and have used them to provide the first conclusive evidence for cosmic deceleration that preceded the current epoch of cosmic acceleration. These objects, discovered during the course of the GOODS ACS Treasury program, include 6 of the 7 highest redshift SNe Ia known, all at z > 1.25, and populate the Hubble diagram in unexplored territory. The luminosity distances to these objects and to 170 previously reported SNe Ia have been determined using empirical relations between light-curve shape and luminosity. A purely kinematic interpretation of the SN Ia sample provides evidence at the greater than 99% confidence level for a transition from deceleration to acceleration or, similarly, strong evidence for a cosmic jerk. Using a simple model of the expansion history, the transition between the two epochs is constrained to be at z = 0.46 ± 0.13. The data are consistent with the cosmic concordance model of ΩM ≈ 0.3, ΩΛ ≈ 0.7 (χ = 1.06) and are inconsistent with a simple model of evolution or dust as an alternative to dark energy. For a flat universe with a cosmological constant, we measure ΩM = 0.29 ± (equivalently, ΩΛ = 0.71). When combined with external flat-universe constraints, including the cosmic microwave background and large-scale structure, we find w = -1.02 ± (and w < -0.76 at the 95% confidence level) for an assumed static equation of state of dark energy, P = wρc2. Joint constraints on both the recent equation of state of dark energy, w0, and its time evolution, dw/dz, are a factor of ~8 more precise than the first estimates and twice as precise as those without the SNe Ia discovered with HST. Our constraints are consistent with the static nature of and value of w expected for a cosmological constant (i.e., w0 = -1.0, dw/dz = 0) and are inconsistent with very rapid evolution of dark energy. We address consequences of evolving dark energy for the fate of the universe.read more
Citations
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Extended theories of gravity and their cosmological and astrophysical applications
TL;DR: In this paper, the authors discuss some cosmological and astrophysical applications where the issues related to the dark components are addressed by enlarging the Einstein theory to more general f (R) Lagrangians, where f(R) is a generic function of Ricci scalar R, not assumed simply linear.
Journal ArticleDOI
The WiggleZ Dark Energy Survey: mapping the distance-redshift relation with baryon acoustic oscillations
Chris Blake,Eyal A. Kazin,Florian Beutler,Tamara M. Davis,Tamara M. Davis,David Parkinson,Sarah Brough,Matthew Colless,Carlos Contreras,Warrick J. Couch,Scott M. Croom,Darren J. Croton,Michael J. Drinkwater,Karl Forster,David Gilbank,Michael D. Gladders,Karl Glazebrook,Ben Jelliffe,Russell J. Jurek,I-hui Li,Barry F. Madore,D. Christopher Martin,Kevin A. Pimbblet,Gregory B. Poole,Michael Pracy,Michael Pracy,Rob Sharp,Rob Sharp,Emily Wisnioski,David Woods,Ted K. Wyder,Howard K. C. Yee +31 more
TL;DR: In this paper, the authors present measurements of the baryon acoustic peak at redshifts z = 0.44, 0.6 and 0.73 in the galaxy correlation function of the final dataset of the WiggleZ Dark Energy Survey.
Journal ArticleDOI
Supernova constraints and systematic uncertainties from the first three years of the supernova legacy survey
Alex Conley,Alex Conley,Julien Guy,Mark Sullivan,Nicolas Regnault,Pierre Astier,Christophe Balland,Christophe Balland,Stéphane Basa,Raymond G. Carlberg,Dominique Fouchez,D. Hardin,I. M. Hook,I. M. Hook,D. A. Howell,D. A. Howell,Reynald Pain,Nathalie Palanque-Delabrouille,Kathy Perrett,Kathy Perrett,C. J. Pritchet,Jeffrey A. Rich,V. Ruhlmann-Kleider,David D. Balam,S. Baumont,Richard S. Ellis,Richard S. Ellis,Sebastien Fabbro,Sebastien Fabbro,H. K. Fakhouri,N. Fourmanoit,Santiago González-Gaitán,Melissa L. Graham,Michael J. Hudson,Eric Hsiao,T. Kronborg,C. Lidman,A. Mourao,James D. Neill,Saul Perlmutter,Saul Perlmutter,P. Ripoche,P. Ripoche,Nao Suzuki,E. S. Walker +44 more
TL;DR: In this article, the authors combine high redshift Type Ia supernovae from the first 3 years of the Supernova Legacy Survey (SNLS) with other supernova (SN) samples, primarily at lower redshifts, to form a high-quality joint sample of 472 SNe (123 low-$z, 93 SDSS, 242 SNLS, and 14 {\it Hubble Space Telescope}).
Journal ArticleDOI
Tracing cosmic evolution with clusters of galaxies
TL;DR: The most successful cosmological models to date envision structure formation as a hierarchical process in which gravity is constantly drawing lumps of matter together to form increasingly larger structures as discussed by the authors, and clusters of galaxies currently sit atop this hierarchy as the largest objects that have had time to collapse under the influence of their own gravity.
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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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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
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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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Observational Evidence from Supernovae for an Accelerating Universe and a Cosmological Constant
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