The Scale-invariant Power Spectrum of Primordial Curvature Perturbation in CSTB Cosmos
arXiv:1401.0094 · doi:10.1088/1475-7516/2014/07/008
Abstract
We investigate the spectrum of cosmological perturbations in a bounce cosmos modeled by a scalar field coupled to the string tachyon field (CSTB cosmos). By explicit computation of its primordial spectral index we show the power spectrum of curvature perturbations, generated during the tachyon matter dominated contraction phase, to be nearly scale invariant. We propose a unified space of parameters for a systematic study of inflationary/bouncing cosmologies. We find that CSTB cosmos is dual--in Wands's sense--to the slow-roll inflation model as can be easily seen from this unified parameter space. Guaranteed by the dynamical attractor behavior of CSTB Cosmos, this scale invariance is free of the fine-tuning problem, in contrast to the slow-roll inflation model.
19 pages, 2 figures
References in corpus (15)
- Starting the Universe: Stable Violation of the Null Energy Condition and Non-standard Cosmologies
- Towards a Nonsingular Bouncing Cosmology
- Bouncing Universe with Quintom Matter
- Primordial perturbations and non-Gaussianities in DBI and general multi-field inflation
- Non-singular cosmology in a model of non-relativistic gravity
- Cosmology without inflation
- A Matter Bounce By Means of Ghost Condensation
- Thermodynamics and classification of cosmological models in the Horava-Lifshitz theory of gravity
- The Matter Bounce Alternative to Inflationary Cosmology
- Towards a Cosmological Dual to Inflation
- K-Bounce
- Scale Invariance via a Phase of Slow Expansion
- Comments on "Growth of Covariant Perturbations in the Contracting Phase of a Bouncing Universe" by A. Kumar
- Dualities between Scale Invariant and Magnitude Invariant Perturbation Spectra in Inflationary/Bouncing Cosmos
- Bouncing Cosmologies
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- Bouncing Cosmologies: Progress and Problems
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- Dark matter constraints from dwarf galaxies: a data-driven analysis
- Indirect dark matter searches in the dwarf satellite galaxy Ursa Major II with the MAGIC Telescopes
- Local Group dSph radio survey with ATCA (III): Constraints on Particle Dark Matter
- Dark matter in a bouncing universe
- Direct dark matter searches - Test of the Big Bounce Cosmology
- Effective Action for Cosmological Scalar Fields at Finite Temperature
- Big Bounce Genesis and Possible Experimental Tests -- A Brief Review
- The CST Bounce Universe model -- a parametric study
- Thermal Fluctuations of Dark Matter in Bouncing Cosmology
- Primordial Gravitational Waves Spectrum in the Coupled-Scalar-Tachyon Bounce Universe
- Thermally Producing and Weakly Freezing-out Dark Matter in Bouncing Universe
- Warm and Cold Dark Matter in Bouncing Universe
- Inert scalar dark matter in an extra dimension inspired model
- Following the density perturbations through a bounce with AdS/CFT Correspondence
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