搜索结果: 1-15 共查到“高能物理学 Gravity”相关记录47条 . 查询时间(0.046 秒)
One-loop quantum gravity repulsion in the early Universe
One-loop quantum gravity the early Universe
2010/12/27
Perturbative quantum gravity is used to compute the lowest order corrections to the classical spatially flat cosmological FLRW solution (for the radiation). The presented approach is analogous to the...
A central theme in cosmology is the perplexing fact that the Universe is undergoing an accelerating expansion. The latter, one of the most important and challenging current problems in cosmology, rep...
N-body Simulations for f(R) Gravity using a Self-adaptive Particle-Mesh Code
N-body Simulations Gravity Self-adaptive Particle-Mesh Code
2010/12/24
We perform high resolution N-body simulations for f(R) gravity based on a self-adaptive particle- mesh code MLAPM. The Chameleon mechanism that recovers General Relativity on small scales is fully ta...
Mutated hybrid inflation in $f(R,{\Box}R)$-gravity
Mutated hybrid inflation High Energy Physics
2010/12/23
A new hybrid inflationary scenario in the context of $f(R,{\Box}R)$-gravity is proposed. Demanding the waterfall field to 'support the potential from below' [unlike the original proposal by Stewart i...
Inhomogeneous fluid flows which become supersonic are known to produce acoustic analogs of ergoregions and horizons. This leads to Hawking-like radiation of phonons with a temperature essentially give...
Cosmic acceleration and the challenge of modifying gravity
Cosmic acceleration modifying gravity
2010/12/24
briefly discuss the challenges presented by attempting to modify general relativity to obtain an explanation for the observed accelerated expansion of the universe. Foremost among these are the quest...
Observational signatures of pre-inflationary and lower-dimensional effective gravity
Observational signatures pre-inflationary lower-dimensional effective gravity
2010/12/24
Several alternative ways to quantize gravitational interactions seem to indicate that gravity at short distances is effectively two-dimensional. If this were true, and the energy scale at which the d...
Background independent condensed matter models for quantum gravity
Background independent condensed matter models quantum gravity
2010/12/27
A number of recent proposals for a quantum theory of gravity are based on the idea that spacetime geometry and gravity are derivative concepts and only apply at an approximate level. There are two fu...
Unified cosmic history in modified gravity: from F(R) theory to Lorentz non-invariant models
Unified cosmic history modified gravity
2010/12/24
Classical generalization of general relativity is considered as gravitational alternative for unified description of the early-time inflation with late-time cosmic acceleration. The structure and cosm...
The regular cosmic string in Born-Infeld gravity
The regular cosmic string Born-Infeld gravity
2010/12/27
It is shown that Born-Infeld gravity --a high energy deformation of Einstein gravity-- removes the singularities of a cosmic string. The respective vacuum solution results to be free of conical singul...
Three of the four forces of Nature are described by quantum Yang-Mills theories with remarkable precision. The fourth force, gravity, is described classically by the Einstein-Hilbert theory. There app...
The Conformal Constraint in Canonical Quantum Gravity
The Conformal Constraint Canonical Quantum Gravity
2010/12/24
Perturbative canonical quantum gravity is considered, when coupled to a renormalizable model for matter fields. It is proposed that the functional integral over the dilaton field should be disentangle...
We study the classical second law of black hole thermodynamics, for Lovelock theories (other than General Relativity), in arbitrary dimensions. Using the standard formula for black hole entropy, we c...
De Sitter brane-world, localization of gravity, and the cosmological constant
De Sitter brane-world localization of gravity the cosmological constant
2010/12/24
Cosmological models with a de Sitter 3-brane embedded in a five-dimensional de Sitter spacetime (dS5) give rise to a finite 4D Planck mass similar to that in Randall-Sundrum (RS) brane-world models in...
Non-universal shear viscosity from Einstein gravity
Non-universal shear viscosity Einstein gravity
2010/12/24
A very famous result of gauge/gravity duality is the universality of the ratio of shear viscosity to entropy density in every field theory holographically dual to classical, two-derivative (Einstein)...