(Dis)continuities of massless limits in spin-3/2-mediated interactions and cosmological supergravity

被引：34

作者：

Deser, S ^{[1
]}

Waldron, A ^{[1
]}

机构：

[1] Brandeis Univ, Dept Phys, Waltham, MA 02254 USA

来源：

PHYSICS LETTERS B | 2001年 / 501卷 / 1-2期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1016/S0370-2693(01)00109-5

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We extend to its spin-3/2 supersymmetric partner the very recent demonstration that the massless limit of massive spin-2 exchange amplitudes can be made continuous in background AdS spaces, in contrast to the known flat space discontinuities for both systems. In an AdS background, unlike spin-2 where the limit m --> 0 is the massless one, spin-3/2 "masslessness" requires m --> root-Lambda /3. the supergravity value tuning the mass and cosmological constant that uniquely provides gauge invariance and two helicities. We find that continuity of the spin-3/2-mediated exchange amplitude can be regained in two "massless" limits m --> 0 and m --> root-Lambda /3; only the latter corresponds to cosmological supergravity. (C) 2001 Published by Elsevier Science B.V.

引用

页码：134 / 139

页数：6