Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
Eiichiro Komatsu,Jo Dunkley,M. R. Nolta,Charles L. Bennett,B. Gold,Gary Hinshaw,Norman Jarosik,David L. Larson,Michele Limon,L. Page,David N. Spergel,Mark Halpern,Robert S. Hill,A. Kogut,S. S. Meyer,G. S. Tucker,Janet Weiland,Edward J. Wollack,Edward L. Wright +18 more
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In this paper, the authors show that the tensor-to-scalar ratio r 1 is disfavored regardless of r. They provide a set of "WMAP distance priors, to test a variety of dark energy models.Abstract:
(Abridged) The WMAP 5-year data strongly limit deviations from the minimal LCDM model. We constrain the physics of inflation via Gaussianity, adiabaticity, the power spectrum shape, gravitational waves, and spatial curvature. We also constrain the properties of dark energy, parity-violation, and neutrinos. We detect no convincing deviations from the minimal model. The parameters of the LCDM model, derived from WMAP combined with the distance measurements from the Type Ia supernovae (SN) and the Baryon Acoustic Oscillations (BAO), are: Omega_b=0.0456+-0.0015, Omega_c=0.228+-0.013, Omega_Lambda=0.726+-0.015, H_0=70.5+-1.3 km/s/Mpc, n_s=0.960+-0.013, tau=0.084+-0.016, and sigma_8=0.812+-0.026. With WMAP+BAO+SN, we find the tensor-to-scalar ratio r 1 is disfavored regardless of r. We obtain tight, simultaneous limits on the (constant) equation of state of dark energy and curvature. We provide a set of "WMAP distance priors," to test a variety of dark energy models. We test a time-dependent w with a present value constrained as -0.33<1+w_0<0.21 (95% CL). Temperature and matter fluctuations obey the adiabatic relation to within 8.9% and 2.1% for the axion and curvaton-type dark matter, respectively. The TE and EB spectra constrain cosmic parity-violation. We find the limit on the total mass of neutrinos, sum(m_nu)<0.67 eV (95% CL), which is free from the uncertainty in the normalization of the large-scale structure data. The effective number of neutrino species is constrained as N_{eff} = 4.4+-1.5 (68%), consistent with the standard value of 3.04. Finally, limits on primordial non-Gaussianity are -9<f_{NL}^{local}<111 and -151<f_{NL}^{equil}<253 (95% CL) for the local and equilateral models, respectively.read more
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Primordial non-gaussianity, scale-dependent bias, and the bispectrum of galaxies
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TL;DR: In this paper, the authors used the Matarrese-Lucchin-Bonometto formula and the locality of galaxy bias to calculate the bispectrum of the three-point correlation function of cosmological fluctuations.
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Probing interaction and spatial curvature in the holographic dark energy model
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Kiyoshi Masui,Eric R. Switzer,Eric R. Switzer,N. Banavar,Kevin Bandura,Chris Blake,L.-M. Calin,Tzu-Ching Chang,Xuelei Chen,Xuelei Chen,Yi-Chao Li,Yu-Wei Liao,Aravind Natarajan,Ue-Li Pen,Jeffrey B. Peterson,J. R. Shaw,T. C. Voytek +16 more
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Asymptotically Safe Inflation
TL;DR: In this article, the authors studied inflation in the context of asymptotically safe theories of gravitation and explored conditions under which it is possible to have a long period of nearly exponential expansion that eventually comes to an end.
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Non-Gaussianity as a Probe of the Physics of the Primordial Universe and the Astrophysics of the Low Redshift Universe
Eiichiro Komatsu,Niayesh Afshordi,Nicola Bartolo,Daniel Baumann,J. R. Bond,Evgeny I. Buchbinder,Christian T. Byrnes,Xingang Chen,Daniel J. H. Chung,Asantha Cooray,Paolo Creminelli,Neal Dalal,O. Doré,Richard Easther,Andrei V. Frolov,K. M. Górski,Mark G. Jackson,Justin Khoury,William H. Kinney,Lev Kofman,Kazuya Koyama,Louis Leblond,Jean Luc Lehners,James E. Lidsey,Michele Liguori,Eugene A. Lim,Andrei D. Linde,David H. Lyth,Juan Maldacena,Sabino Matarrese,Liam McAllister,Patrick McDonald,Shinji Mukohyama,Burt A. Ovrut,H. V. Peiris,Christoph W. Raeth,A. Riotto,Yeinzon Rodriguez,Misao Sasaki,Roman Scoccimarro,David Seery,Emiliano Sefusatti,U. Seljak,Leonardo Senatore,Sarah Shandera,E. P. S. Shellard,Eva Silverstein,Anze Slosar,K. M. Smith,Alexei A. Starobinsky,Paul J. Steinhardt,F. Takahashi,Max Tegmark,Andrew J. Tolley,Licia Verde,B. D. Wandelt,David Wands,S. Weinberg,Mark Wyman,Amit Yadav,Matias Zaldarriaga +60 more
TL;DR: Non-Gaussianity, i.e., the study of nonGaussian contributions to the correlations of cosmological fluctuations, will become an important probe of both the early and the late Universe as discussed by the authors.
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Improved Constraints on the Gravitational Lens Q0957+561. II. Strong Lensing
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Journal ArticleDOI
The Atacama Cosmology Telescope (ACT): Beam Profiles and First SZ Cluster Maps
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Journal ArticleDOI
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Journal ArticleDOI
Axions, Inflation and the Anthropic Principle
TL;DR: In this article, it was shown that for axions produced before inflation, symmetry-breaking scales of $f_a \gtrsim 10^{12}$ GeV (which are favored in string-theoretic axion models) are ruled out by cosmological constraints unless both the axion misalignment angle and the inflationary Hubble scale $H_I$ are extremely fine-tuned.
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