Cosmology In Terms Of The Deceleration Parameter. Part II
arXiv:1506.08918
Abstract
In the early seventies, Alan Sandage defined cosmology as the search for two numbers: Hubble parameter and deceleration parameter . The first of the two basic cosmological parameters (the Hubble parameter) describes the linear part of the time dependence of the scale factor. Treating the Universe as a dynamical system it is natural to assume that it is non-linear: indeed, linearity is nothing more than approximation, while non-linearity represents the generic case. It is evident that future models of the Universe must take into account different aspects of its evolution. As soon as the scale factor is the only dynamical variable, the quantities which determine its time dependence must be essentially present in all aspects of the Universe' evolution. Basic characteristics of the cosmological evolution, both static and dynamical, can be expressed in terms of the parameters and . The very parameters (and higher time derivatives of the scale factor) enable us to construct model-independent kinematics of the cosmological expansion. Time dependence of the scale factor reflects main events in history of the Universe. Moreover it is the deceleration parameter who dictates the expansion rate of the Hubble sphere and determines the dynamics of the observable galaxy number variation: depending on the sign of the deceleration parameter this number either grows (in the case of decelerated expansion), or we are going to stay absolutely alone in the cosmos (if the expansion is accelerated). The intended purpose of the report is reflected in its title --- "Cosmology in terms of the deceleration parameter". We would like to show that practically any aspect of the cosmological evolution is tightly bound to the deceleration parameter. It is the second part of the report. The first part see here http://arxiv.org/abs/1502.00811
76 pages, 21 figures. arXiv admin note: text overlap with arXiv:1503.06280, arXiv:1310.7167, arXiv:hep-th/0204008, arXiv:1305.5190, arXiv:1307.4911, arXiv:1010.0672, arXiv:0704.3121, arXiv:1010.6268, arXiv:1409.0901 by other authors
References in corpus (26)
- Dark energy cosmology: the equivalent description via different theoretical models and cosmography tests
- SNLS3: Constraints on Dark Energy Combining the Supernova Legacy Survey Three Year Data with Other Probes
- Approaches to Understanding Cosmic Acceleration
- Dark Energy-Dark Matter Interaction and putative violation of the Equivalence Principle from the Abell Cluster A586
- Dynamics of dark energy with a coupling to dark matter
- Warm Inflation and its Microphysical Basis
- Cosmography of f(R) gravity
- Kinetic k-essence and Quintessence
- Challenges for scaling cosmologies
- Signature of the interaction between dark energy and dark matter in galaxy clusters
- Cosmological coincidence problem in interacting dark energy models
- Cosmological Evolution of Interacting Phantom Energy with Dark Matter
- Dark energy models with variable equation of state parameter
- Cosmological Evolution of Quintessence and Phantom with a New Type of Interaction in Dark Sector
- Constraints on cosmological parameters in power-law cosmology
- Energy conditions and current acceleration of the universe
- Observational constraints on late-time Lambda(t) cosmology
- Dark Energy-Dark Matter Interaction from the Abell Cluster A586 and violation of the Equivalence Principle
- Power-law cosmology, SN Ia, and BAO
- Cosmography: Extracting the Hubble series from the supernova data
- A divergence-free parametrization for dynamical dark energy
- Age of the Universe, Average Deceleration Parameter and Possible Implications for the End of Cosmology
- Another coincidence problem for CDM?
- Observational constraints on Modified Chaplygin Gas from Large Scale Structure
- Cosmic acceleration a new review
- The coincidence problem in the scenario of dark energy interacting with two fluids