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Dark Atoms of the Universe: towards OHe nuclear physics
Dark Atoms Universe OHe nuclear physics
2011/1/10
The nonbaryonic dark matter of the Universe is assumed to consist of new stable particles. A specific case is possible, when new stable particles bear ordinary electric charge and bind in heavy ”atoms...
Kerr-de Sitter Universe
2010/12/20
It is now widely accepted that the universe as we understand it is accelerating in expansion and fits the de Sitter model rather well. As such, a realistic assumption of black holes must place them on...
Propagation of the burst of radiation in expanding and recombining Universe: Thomson scattering
radiation expanding recombining Universe
2011/1/10
Within the framework of a flat cosmological model a propagation of an instantaneous burst of nonpolarized isotropic radiation is considered from the moment of its beginning at some initial redshift z0...
Constraints on the Dark Side of the Universe and Observational Hubble Parameter Data
Cosmology and Extragalactic Astrophysics (astro-ph.CO)
2010/12/27
This paper is a review on the observational Hubble parameter data that have gained increasing attention in recent years for their illuminating power on the dark side of the universe --- the dark matte...
The Accelerating Universe
Cosmology and Extragalactic Astrophysics (astro-ph.CO) Popular Physics (physics.pop-ph)
2010/12/24
In this article we review the discovery of the accelerating universe using type Ia supernovae. We then outline ways in which dark energy - component that causes the acceleration - is phenomenologicall...
Constraining the expansion rate of the Universe using low-redshift ellipticals as cosmic chronometers
Cosmology and Extragalactic Astrophysics (astro-ph.CO)
2010/12/24
We present a new methodology to determine the expansion history of the Universe analyzing the spectral properties of early type galaxies (ETG). We found that for these galaxies the 4000\AA break is a ...
It is first pointed out that there is a common mathematical model for the universe and the quantum computer. The former is called the histories approach to quantum mechanics and the latter is called m...
Our starting point is a particular `canvas' aimed to `draw' theories of physics,which has symmetric monoidal categories as its mathematical backbone. In this paper we consider the conceptual foundatio...
Our starting point is a particular `canvas' aimed to `draw' theories of physics,which has symmetric monoidal categories as its mathematical backbone. In this paper we consider the conceptual foundatio...
Energy in an Expanding Universe in the Teleparallel Geometry
Gravitation teleparallelism gravitational energy- momentum tensor
2010/6/30
The main purpose of this paper is to explicitly verify the consistency of the energy-momentum and angular momentum tensor of the gravitational field established in the Hamiltonian structure of the Tel...
Gravitational Charged Perfect Fluid Collapse in Friedmann Universe Models
Electric field Gravitational collapse Cosmological constant Friedmann models
2010/3/18
This paper is devoted to study the gravitational charged perfect fluid collapse in the Friedmann universe models with cosmological constant. For this purpose, we assume that the electromagnetic field ...
A universe much like the (Euclidean) de Sitter space-time appears as background geometry in the causal dynamical triangulation (CDT) regularization of quantum gravity. We study the geometry of such un...
Mixmaster universe in the z=3 deformed Hořava-Lifshitz gravity
Hoˇrava-Lifshitz gravity quantum gravity mixmaster universe
2010/3/18
The z=3 deformed Horava-Lifshitz gravity with coupling constants \omega and \epsilon leads to a nonrelativistic "mixmaster" cosmological model. The potential of theory is given by the sum of IR and UV...
Expanding Universe and its manifestations beyond the General Relativity
Expanding Universe General Relativity
2010/3/18
It has been demonstrated that a modern stage of the Universe expansion may be described in accordance with the observations within the scope of the space-time conformal geometry. The clock synchroniza...
Varying couplings in the early universe: correlated variations of $\alpha$ and $G$
early universe Planck satellite mission
2010/3/19
The Cosmic Microwave Background anisotropies provide a unique opportunity to constrain simultaneous variations of the fine-structure constant $\alpha$ and Newton's gravitational constant $G$. Those co...