arXiv subjects

Guohong Yang

Publications and source records attributed to Guohong Yang.

4 recordsLinked to original sources

arXiv2007

Quasinormal modes and phase Transition of black holes

We have studied the scalar field as well as the fermonic field perturbations in the background of the massless BTZ black holes. Comparing with the perturbation results in the generic nonrotating BTZ black hole background, we found that the massless BTZ hole contains only normal modes in the perturbations. We argued that this special property reflects that the massless BTZ black hole is a different phase from that of the generic nonrotating BTZ hole.

gr-qc↗

arXiv2007

The energy absorption problem of a brane-world black hole

We have studied the wave dynamics and the energy absorption problem for the scalar field as well as the brane-localized gravitational field in the background of a braneworld black hole. Comparing our results with the four-dimensional Schwarzschild black hole, we have observed the signature of the extra dimension in the energy absorption spectrum.

hep-th↗

arXiv1998

The topological quantization and the branch process of the (k-1)-dimensional topological defects

In the light of $ϕ$-mapping method and topological current theory, the topological structure and the topological quantization of arbitrary dimensional topological defects are obtained under the condition that the Jacobian $J(ϕ/v) \neq 0$. When $J(ϕ/v)=0$, it is shown that there exist the crucial case of branch process. Based on the implicit function theorem and the Taylor expansion, we detail the bifurcation of generalized topological current and find different directions of the bifurcation. The arbitrary dimensional topological defects are found splitting or merging at the degenerate point of field function $\vec ϕ$ but the total charge of the topological defects is still unchanged.

hep-th↗

arXiv1998

The topological quantization and bifurcation of the topological linear defects

In the light of $ϕ$-mapping method and topological current theory, the topological structure and the topological quantization of topological linear defects are obtained under the condition that the Jacobian $J(ϕ/v) \neq 0$. When $J(ϕ/v) = 0$, it is shown that there exist the crucial case of branch process. Based on the implicit function theorem and the Taylor expansion, the origin and bifurcation of the linear defects are detailed in the neighborhoods of the limit points and bifurcation points of $ϕ$-mapping, respectively.

hep-th↗