Spinning particles on 2-sphere in accord with the Bianchi classification

Ponzano-Regge模型再论I：规范固定、可观测量和相互作用的自旋粒子

Ponzano-Regge model revisited I: Gauge fixing, observables and interacting spinning particles

我们展示了如何正确的规范修复的所有对称性的Ponzano-Regge模型的三维量子引力。这相当于对跃迁振幅进行显式有限计算。给出了存在相互作用量子自旋粒子时跃迁振幅的构造。我们引入了一个概念的运营商的期望值引起要么规范固定，引入时间，或插入粒子，根据选择。给出了自旋泡沫量子化与哈密顿量子化之间的联系。最后，我们指出了Ponzano-Regge模型与基于SU（2）的双量子群的Chern-Simons量子化理论之间的联系

AdS/CFT对偶中的Zig Zag对称

Zig Zag symmetry in AdS/CFT duality

的Bianchi身份，这是密切相关的之字形对称性，建立的有效性，分段连续的轮廓，在上下文中的Polakov的规范场弦连接在大的'tHooft耦合限制，根据该色电“弦”传播在五个维度上，其端部附加在一个威尔逊圈在四个维度。波浪线近似的显式检查。

Quantum corrections for spinning particles in de Sitter

We compute the one-loop quantum corrections to the gravitational potentials of a spinning point particle in a de Sitter background, due to the vacuum polarisation induced by conformal fields in an effective field theory approach. We consider arbitrary conformal field theories, assuming only that the theory contains a large number $N$ of fields in order to separate their contribution from the one induced by virtual gravitons. The corrections are described in a gauge-invariant way, classifying the induced metric perturbations around the de Sitter background according to their behaviour under tra…

Tunneling of Massive Vector Particles from Dilaton Black Holes in $(2+1)$ Dimensions

In this paper, we have studied the Hawking radiation of massive spin-$1$ particles from the black holes in $(2+1)$ dimensions with non- trivial dilaton fields. We consider two special varities of these black holes one is static charged and other is spinning electrically neutral. By applying the standard method of $WKB$ approximation and Hamilton- Jacobi ansatz we have shown the tunneling probability and Hawking temperature of massive bosons accordingly. In the certain limit of the dilaton coupling for spinning neutral case we have recovered the Hawking temperature of the $BTZ$ black holes as w…

Next-to-next-to-leading order gravitational spin-orbit coupling via the effective field theory for spinning objects in the post-Newtonian scheme

We implement the effective field theory for gravitating spinning objects in the post-Newtonian scheme at the next-to-next-to-leading order level to derive the gravitational spin-orbit interaction potential at the third and a half post-Newtonian order for rapidly rotating compact objects. From the next-to-next-to-leading order interaction potential, which we obtain here in a Lagrangian form for the first time, we derive straightforwardly the corresponding Hamiltonian. The spin-orbit sector constitutes the most elaborate spin dependent sector at each order, and accordingly we encounter a prolife…

光锥上的无质量自旋场：四次顶点和幅值

Massless spinning fields on the Light-Front: quartic vertices and amplitudes

本文研究了光锥框架下无质量高自旋场的四次顶点和幅值，揭示了四次约束对高自旋相互作用的影响，并提出了新的局部高自旋理论。

Through the Big Bang

All measurements are comparisons. The only physically accessible degrees of freedom (DOFs) are dimensionless ratios. The objective description of the universe as a whole thus predicts only how these ratios change collectively as one of them is changed. Here we develop a description for classical Bianchi IX cosmology implementing these relational principles. The objective evolution decouples from the volume and its expansion degree of freedom. We use the relational description to investigate both vacuum dominated and quiescent Bianchi IX cosmologies. In the vacuum dominated case the relational …

Can Mathisson-Papapetrou equations give clue to some problems in astrophysics?

First, we stress that for correct description of highly relativistic fermions in a gravitational field it is necessary to have an equation which in the limiting transition to the classical (non-quantum) case corresponds to the exact Mathisson-Papapetrou equations. According to these equations the spin in general relativity is Fermi-transported, and the parallel transport of spin is realized only in some approximation. The traditional general-relativistic Dirac equation (1929) is based on the parallel transported spinors and does not ensure the correspondent transition. Second, because in the r…