搜索结果: 121-135 共查到“宇宙线物理学”相关记录346条 . 查询时间(0.448 秒)
The path-integral formulation of quantum cosmology with a massless scalar field as a sum-over-histories of volume transitions is discussed, with particular but non-exclusive reference to loop quantum ...
We describe a way to construct supergravity models with an arbitrary inflaton potential V ({\phi}) and show that all other scalar fields in this class of models can be stabilized at the inflationary t...
On KLT and SYM-supergravity relations from 5-point 1-loop amplitudes
KLT SYM-supergravity relations 5-point 1-loop amplitudes
2010/12/23
We derive a new non-singular tree-level KLT relation for the $n=5$-point amplitudes, with manifest $2(n-2)!$ symmetry, using information from one-loop amplitudes and IR divergences, and speculate how...
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...
Can accretion disk properties observationally distinguish black holes from naked singularities?
black holes naked singularities
2010/12/27
Naked singularities are hypothetical astrophysical objects, characterized by a gravitational singularity without an event horizon. Penrose has proposed a conjecture, according to which there exists a ...
Quantum Field Theory, Black Holes and Holography
Quantum Field Theory Black Holes Holography
2010/12/24
These notes are an expanded version of lectures given at the Croatian School on Black Holes at Trpanj, June 21-25, 2010. The aim is to provide a practical introduction to quantum field theory in curv...
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...
Two-Center Black Holes Duality-Invariants for stu Model and its lower-rank Descendants
Two-Center Black Holes Duality-Invariants stu Model
2010/12/24
We classify 2-center extremal black hole charge configurations through duality-invariant homogeneous polynomials, which are the generalization of the unique invariant quartic polynomial for single-cen...
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...
Maximally Supersymmetric Yang-Mills in five dimensions in light-cone superspace
Maximally Supersymmetric Yang-Mills light-cone superspace
2010/12/24
We formulate maximally supersymmetric Yang-Mills theory in five dimensions in light-cone superspace. The light-cone Hamiltonian is of the quadratic form and the theory can be understood as an oxidati...
N=4 Multi-Particle Mechanics, WDVV Equation and Roots
N=4 Multi-Particle Mechanics WDVV Equation and Roots
2010/12/23
We review the relation of N=4 superconformal multi-particle models on the real line to the WDVV equation and an associated linear equation for two prepotentials, F and U. The superspace treatment give...
Single-charge rotating black holes in four-dimensional gauged supergravity
Single-charge rotating black holes four-dimensional gauged supergravity
2010/12/23
We consider four-dimensional U(1)^4 gauged supergravity, and obtain asymptotically AdS_4, non-extremal, charged, rotating black holes with one non-zero U(1) charge. The thermodynamic quantities are co...
In this paper we characterize barotropic index singularities of homogeneous isotropic cosmological models. They are shown to appear in cosmologies for which the scale factor is analytical with a Tayl...
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...
Dark Radiation Emerging After Big Bang Nucleosynthesis?
Dark Radiation Emerging Big Bang Nucleosynthesis
2010/12/27
We show how recent data from observations of the cosmic microwave background may suggest the presence of additional radiation density which appeared after big bang nucleosynthesis. We propose a gener...