搜索结果: 1-15 共查到“宇宙线物理学 Gravity”相关记录23条 . 查询时间(0.187 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...
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...
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...
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...
Energy conditions in modified Gauss-Bonnet gravity
Energy conditions modified Gauss-Bonnet gravity
2010/12/27
In considering alternative higher-order gravity theories, one is liable to be motivated in pursuing models consistent and inspired by several candidates of a fundamental theory of quantum gravity. In...
Stellar Structure and Tests of Modified Gravity
Stellar Structure Tests of Modified Gravity
2010/12/27
Theories that attempt to explain cosmic acceleration by modifying gravity typically introduces a long-range scalar force that needs to be screened on small scales. One common screening mechanism is t...
Quantum Back-Reaction in Scale Invariant Induced Gravity
Quantum Back-Reaction Invariant Induced Gravity
2010/12/27
A quartic, self-interacting potential in the induced gravity framework is known to have a pure de Sitter attractor for the homogeneous mode. In order to obtain non-zero slow roll parameters we theref...
Traversable wormhole in the deformed Hořava-Lifshitz gravity
Traversable wormhole deformed Hoř ava-Lifshitz gravity
2010/12/27
Asymptotically flat wormhole solutions are found in the deformed Ho\v{r}ava-Lifshitz gravity. It turns out that higher curvature terms can not play the role of exotic matters which are crucial to form...
More on the dilatonic Einstein-Gauss-Bonnet gravity
dilatonic Einstein-Gauss-Bonnet gravity
2010/12/23
Einstein-Gauss-Bonnet gravity coupled to a dynamical dilaton is examined from the viewpoint of Einstein's equivalence principle. We point out that the usual frame change that applies to the action wit...
Dark Matter as a Relativistic Inertial Effect in Einstein Canonical Gravity?
Dark Matter Relativistic Inertial Effect Einstein Canonical Gravity
2010/12/27
After the study of non-inertial frames in special relativity with emphasis on the problem of clock synchronization (i.e. of how to define 3-space), an overview is given of Einstein canonical gravity ...
We construct four-dimensional covariant non-linear theories of massive gravity which are ghost-free in the decoupling limit to all orders. These theories resum explicitly all the nonlinear terms of a...
An old Einstein - Eddington generalized gravity and modern ideas on branes and cosmology
Einstein - Eddington generalized gravity branes cosmology
2010/12/27
We briefly discuss new models of an `affine' theory of gravity in multidimensional space-times with symmetric connections. We use and generalize Einstein's proposal to specify the space-time geometry...