Limiting temperature, limiting curvature and the cyclic universe
TLDR
In this article, the authors proposed a cosmological model in which not only the temperature but also the curvature is limited by the mass scale of the Hagedorn temperature.Abstract:
We propose a new type of cosmological model in which it is postulated that not only the temperature but also the curvature is limited by the mass scale of the Hagedorn temperature. We find that the big bang of this universe is smoothly connected to the big crunch of the previous universe through a Hagedorn universe, in which the temperature and curvature remain very close to their limiting values. In this way, we obtain the picture of a cyclic universe. By estimating the entropy gained in each big crunch and big bang, we reach the conclusion that our universe has repeated this process about forty times after it was created at the Planck scale. We also show that the model gives a scale-invariant spectrum of curvature perturbations.read more
Citations
More filters
Journal ArticleDOI
Effects of space-time noncommutativity on the angular power spectrum of the CMB
TL;DR: In this paper, the effects of space-time noncommutativity on the quantum fluctuations of an inflaton field and their contributions to the cosmic microwave background (CMB) were investigated.
Journal ArticleDOI
Unification of cosmology and the second law of thermodynamics : Proposal for solving the cosmological constant and inflation problems
TL;DR: In this paper, it was shown that there is no strong maximum for the entropy of a cyclic time model world and that an S 1 cyclic model world could have entropy that varies by at most a factor of two and would not be phenomenologically realistic.
Journal ArticleDOI
A mechanism of the large-scale damping in the CMB anisotropy
TL;DR: In this paper, a mechanism through which a certain class of short-distance cutoff affects the CMB anisotropies at large angular scales is presented, and a condition for a cutoff to yield a damping on large scales.
Journal ArticleDOI
Banks-Zaks cosmology, inflation, and the Big Bang singularity
TL;DR: In this article, the authors consider the thermodynamic behavior of the Bank-Zaks theory close to the conformal point in a cosmological setting and provide a full "phase diagram" of possible Universe evolution for the given parameters.
Journal ArticleDOI
Banks-Zaks Cosmology, Inflation, and the Big Bang Singularity
TL;DR: In this paper, the authors consider the thermodynamical behavior of the Bank-Zaks theory close to the conformal point in a cosmological setting and provide a full "phase diagram" of possible Universe evolution for the given parameters.
References
More filters
Journal ArticleDOI
First year Wilkinson Microwave Anisotropy Probe (WMAP) observations: Determination of cosmological parameters
David N. Spergel,Licia Verde,Hiranya V. Peiris,Eiichiro Komatsu,M. R. Nolta,Charles L. Bennett,Mark Halpern,Gary Hinshaw,N. Jarosik,Alan J. Kogut,Michele Limon,Michele Limon,S. S. Meyer,Lyman A. Page,Gregory S. Tucker,Gregory S. Tucker,Gregory S. Tucker,Janet L. Weiland,Edward J. Wollack,Edward L. Wright +19 more
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.
Journal ArticleDOI
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.
Journal ArticleDOI
Cosmological Event Horizons, Thermodynamics, and Particle Creation
TL;DR: In this article, it was shown that the relationship between event horizons and thermodynamics can be extended to cosmological models with a repulsive cosmology constant, and that the spacetime metric itself appears to be observer-dependent.
Book
Theory of Cosmological Perturbations
TL;DR: In this paper, the authors present in a manifestly gauge-invariant form the theory of classical linear gravitational perturbations in part I, and a quantum theory of cosmological perturbation in part II.
Book
Cosmological Inflation and Large-Scale Structure
Andrew R. Liddle,David H. Lyth +1 more
TL;DR: This textbook is the first to provide a modern and unified overview of inflationary cosmology and carefully compares predictions with the latest observations, including those of the cosmic microwave background, the clustering and velocities of galaxies and the epoch of structure formation.