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

Deser, S. and Waldron, A. (2001) (Dis)continuities of massless limits in spin-3/2-mediated interactions and cosmological supergravity. Physics Letters B, 501 (1-2). pp. 134-139. ISSN 0370-2693. doi:10.1016/S0370-2693(01)00109-5.

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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 → √-Λ / 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 → √-Λ/3; only the latter corresponds to cosmological supergravity.

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Deser, S.0000-0001-9285-9434
Additional Information:© 2001 Elsevier B.V. Received 6 December 2000, Accepted 26 December 2000, Available online 1 March 2001. Editor: H. Georgi. This work was supported by the National Science Foundation under grant PHY99-73935.
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Issue or Number:1-2
Record Number:CaltechAUTHORS:20170123-144147003
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Official Citation:S. Deser, A. Waldron, (Dis)continuities of massless limits in spin-3/2-mediated interactions and cosmological supergravity, Physics Letters B, Volume 501, Issues 1–2, 1 March 2001, Pages 134-139, ISSN 0370-2693, (//
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:73630
Deposited By: Ruth Sustaita
Deposited On:26 Jan 2017 20:41
Last Modified:11 Nov 2021 05:19

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