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Holographic Dark Energy Characterized by the Total Comoving Horizon and Insights to Cosmological Constant and Coincidence Problem
Holographic Dark Energy the Total Comoving Horizon Insights Cosmological Constant Coincidence Problem
2012/2/21
The observed acceleration of the present universe is shown to be well explained by the holographic dark energy characterized by the total comoving horizon of the universe ($\eta$HDE). It is of interes...
The Cosmological Constant in the Quantum Multiverse
Cosmological Constant Quantum Multiverse
2011/10/17
Recently, a new framework for describing the multiverse has been proposed which is based on the principles of quantum mechanics. The framework allows for well-defined predictions, both regarding globa...
Inflation and the cosmological constant
general relativity infl ationary universe cosmological constant
2011/10/14
A particular compensation-type solution of the main cosmological constant problem has been proposed recently, with two massless vector fields dynamically canceling an arbitrary cosmological constant \...
The Poincare Conjecture and the Cosmological Constant
Manifold Deformations Poincar Conjecture Cos- mological Constant
2011/10/17
The concept of deformation of Riemannian geometry is reviewed, with applications to gravitation and cosmology. Starting with an analysis of the cosmological constant problem, it is shown that space-ti...
The cosmological constant and the relaxed universe
The cosmological constant the relaxed universe
2011/1/13
We study the role of the cosmological constant (CC) as a component of dark energy (DE). It is argued that the cosmological term is in general unavoidable and it should not be ignored even when dynami...
We address the issue why a cosmological constant (dark energy) possesses a small positive value instead of being zero. Motivated by the cosmic landscape picture, we mimic the dark energy by a scalar f...
Solar System Motions and the Cosmological Constant：jA New Approach
Solar System Motions jA New Approach Cosmological Constant
2009/9/4
We use the corrections to the Newton-Einstein secular precessions of the longitudes of perihelia ϖ˙ of some planets (Mercury, Earth, Mars, Jupiter, Saturn) of the Solar System, phenomenologically...
Notes on the Quantization of FRW Model in the Presence of a Cosmological Constant and Radiation
FRW Model a Cosmological Constant
2010/10/18
In the present work, we use the formalism of quantum general relativity in order to quantize a Friedmann-Robertson-Walker model in the presence of a negative cosmological constant and radiation. The m...
Neutrino Mixing as a Source for Cosmological Constant
Neutrino Mixing Cosmological Constant
2010/10/14
We report on recent results showing that neutrino mixing may lead to a non-zero contribution to the cosmological constant. This contribution is of a completely different nature with respect to the usu...