搜索结果: 1-7 共查到“理学 cosmic strings”相关记录7条 . 查询时间(0.129 秒)
It is shown that topologically stable cosmic strings can, in fact, appear to end or to break, even in theories without monopoles. This can occur whenever the spatial topology of the universe is nontri...
We study the quantum stabilization of a cosmic string by a heavy fermion doublet in a reduced version of the standard model. We show that charged strings, obtained by populating fermionic bound state ...
Level Crossing Analysis of Cosmic Microwave Background Radiation: A method for detecting cosmic strings
Cosmic Microwave Background Radiation detecting cosmic strings
2010/12/27
In this paper we study the footprint of cosmic string as the topological defects in the very early universe on the cosmic microwave background radiation. We develop the method of level crossing analy...
Quasar variability limits on cosmological density of cosmic strings
Quasar variability limits cosmological density cosmic strings
2010/3/19
We put robust upper limits on the average cosmological density \Omega_s of cosmic strings based on the variability properties of a large homogeneous sample of SDSS quasars. We search for an excess of ...
On Current-Carrying Cosmic Strings and the Generalized Rainich Algebra in Scalar-Tensor Gravities
Current-Carrying Cosmic Strings the Generalized Rainich Algebra Scalar-Tensor Gravities
2010/10/15
We obtain exact solutions for a static and charged cosmic string in a Einstein-Maxwell-Dilaton theory of a scalar-tensor type in (3+1)-Dimensions. This theory is specified by the dilaton field f, the ...
The Motion of Cosmic Strings in the Schwarzschild Black Hole Spacetime
string perturbation theory Schwarzschild black hole
2010/4/13
We study the classical dynamics of a bosonic string in the Schwarzschild spacetime using a perturbative scheme which is based on the assumption of a small value of a rescaled string tension parameter....
Nonabelian Cosmic Strings from SO(3) Gauge Symmetry
SO(3) Gauge Symmetry nonabelian cosmic strings
2010/4/15
The nature of SO(3) breaking into its closed subgroups and the emergence of nonabelian cosmic strings are discussed. Relevance to GUT breaking and thereby to cosmology is pointed out. Classification o...