搜索结果: 136-150 共查到“知识库 宇宙线物理学”相关记录259条 . 查询时间(0.843 秒)
Casting Loop Quantum Cosmology in the Spin Foam Paradigm
loop quantum cosmology Spin Foam Paradigm
2010/3/18
The goal of spin foam models is to provide a viable path integral formulation of quantum gravity. Because of background independence, their underlying framework has certain novel features that are not...
Axion Search with Q;A Experiment
Dark matter pseudoscalar-photon interaction axion vacuum dichroism vac-uum birefringence Q & A experiment
2010/3/15
Dark matter is a focused issue in galactic evolution and cosmology. Axion is a viable particle candidate for dark matter. Its interaction with photon is an effective way to detect it, e.g., pseudoscal...
Observational Constraints on the Completeness of Space near Astrophysical Objects
Space near Astrophysical Objects double pulsar
2010/3/18
We consider the observational effects of a deficit angle, w, in the topology of the solar system and in the 'double pulsar' system PSR J0737-3039A/B. Using observations of the perihelion precession of...
We construct examples of static, spherically symmetric wormhole solutions in general relativity with a minimally coupled scalar field $\phi$ whose kinetic energy is negative in a restricted region of ...
Second-order Gauge-invariant Cosmological Perturbation Theory: Current Status
Gauge-invariant Current Status
2010/3/17
The current status of the recent developments of the second-order gauge-invariant cosmological perturbation theory is reviewed. To show the essence of this perturbation theory, we concentrate only on ...
Existence of horizons in Robinson-Trautman spacetimes of arbitrary dimension
arbitrary dimension Robinson-Trautman spacetimes
2010/3/17
We derive the higher dimensional generalization of Penrose-Tod equation describing past horizon in Robinson-Trautman spacetimes with a cosmological constant and pure radiation. Results for D=4 dimensi...
Using the Brans-Dicke theory of gravitation we put under investigation a hypothetical universe filled with a fermionic field (with a self interaction potential) and a matter constituent ruled by a bar...
Recessional velocities and Hubble's law in Schwarzschild-de Sitter space
Fermi coordinates Schwarzschild-de Sitter space Fermi velocity astrometric velocity spectroscopic velocity kinematic velocity superluminal velocity galaxy supercluste Hubble’s law far future Local Group expansion of space
2010/3/17
We consider a spacetime with empty Schwarzschild-de Sitter exterior and Schwarzschild-de Sitter interior metric for a spherical fluid with constant density. The fluid interior may be taken to represen...
Expanding universes in the conformal frame of $f(R) $ gravity
Expanding universes conformal frame $f(R) $ gravity
2010/3/17
The late time evolution of Friedmann-Robertson-Walker (FRW) models with a perfect fluid matter source is studied in the conformal frame of $f(R) $ gravity. We assume that the corresponding scalar fiel...
Generalized Brans-Dicke cosmology in the presence of matter and dark energy
Brans-Dicke cosmology time-dependent expansion inflation dark energy
2010/3/17
We study the Generalized Brans-Dicke cosmology in the presence of matter and dark energy. Of particular interest for a constant Brans-Dicke parameter, the de Sitter space has also been investigated.
On the Dynamics of Bianchi IX cosmological models
General Relativity Quantum Cosmology Time Bianchi IX FRW
2010/3/17
A cosmological description of the universe is proposed in the context of Hamiltonian formulation of a Bianchi IX cosmology minimally coupled to a massless scalar field. The classical and quantum resul...
Fock quantization of a scalar field with time dependent mass on the three-sphere: unitarity and uniqueness
Fock quantization scalar field unitarity
2010/3/17
We study the Fock description of a quantum free field on the three-sphere with a mass that depends explicitly on time, also interpretable as an explicitly time dependent quadratic potential. We show t...
On the initial conditions and solutions of the semiclassical Einstein equations in a cosmological scenario
Einstein equations cosmological scenario
2010/3/17
In this paper we shall discuss the backreaction of a massive quantum scalar field on the curvature, the latter treated as a classical field. Furthermore, we shall deal with this problem in the realm o...
A Faraway Quasar in the Direction of the Highest Energy Auger Event
cosmic rays acceleration of particles radio galaxies particle physics
2010/3/15
The highest energy cosmic ray event reported by the Auger Observatory has an energy of 148 EeV. It does not correlate with any nearby (z$<$0.024) object capable of originating such a high energy event...
Evolutions of Magnetized and Rotating Neutron Stars
Rotating Neutron Stars Evolutions of Magnetized
2010/3/17
We study the evolution of magnetized and rigidly rotating neutron stars within a fully general relativistic implementation of ideal magnetohydrodynamics with no assumed symmetries in three spatial dim...