Violation of angular momentum selection rules in quantum gravity

被引：4

作者：

Datta, A

Gabrielli, E

Mele, B

机构：

[1] Univ Helsinki, Helsinki Inst Phys, FIN-00014 Helsinki, Finland

[2] Univ Roma La Sapienza, Dipartimento Fis, I-00185 Rome, Italy

[3] Ist Nazl Fis Nucl, Sezione Roma, I-00185 Rome, Italy

来源：

PHYSICS LETTERS B | 2004年 / 579卷 / 1-2期

基金：

芬兰科学院;

关键词：

D O I：

10.1016/j.physletb.2003.11.003

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

A simple consequence of the angular momentum conservation in quantum field theories is that the interference of s-channel amplitudes exchanging particles with different spin J vanishes after complete angular integration. We show that, while this rule holds in scattering processes mediated by a massive graviton in quantum gravity, a massless graviton s-channel exchange breaks orthogonality when considering its interference with a scalar-particle s-channel exchange, whenever all the external states are massive. As a consequence, we find that, in the Einstein theory, unitarity implies that angular momentum is not conserved at quantum level in the graviton coupling to massive matter fields. This result can be interpreted as a new anomaly, revealing unknown aspects of the well-known van Dam-Veltman-Zakharov discontinuity. (C) 2003 Elsevier B.V. All rights reserved.

引用

页码：189 / 199

页数：11

共 17 条

[11] MASSIVE SYMMETRIC TENSOR FIELD IN SPACETIMES WITH A POSITIVE COSMOLOGICAL CONSTANT [J].