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Braneworld effective field theories — holography, consistency and conformal effects

Fichet, Sylvain (2020) Braneworld effective field theories — holography, consistency and conformal effects. Journal of High Energy Physics, 2020 (4). Art. No. 016. ISSN 1126-6708. doi:10.1007/JHEP04(2020)016.

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Braneworld theories are often described as low-energy effective field theories (EFTs) featuring an infinitely thin 3-brane and 4D fields exactly localized on it. We investigate whether an exactly localized braneworld can arise as a limit of a theory of 5D fields. Using a holographic formalism we argue that such limit does not exist in the presence of gravity, therefore implying a discontinuity in the space of EFTs. We then present specific models involving exactly localized fields in which inconsistencies appear, which are solved when fields are taken as quasilocalized. Part of our arguments rely on conjectures from the “swampland” program. Our investigation motivates braneworld EFTs built from 5D fields, i.e. quasilocalized braneworlds. Observable effects from quasilocalization are significant for warped braneworlds such as Randall-Sundrum II (RSII), and are reminiscent of a conformal hidden sector. Focusing on the gauge-gravity sector we show that manifestations of the quasilocalized warped braneworld include i) an anomalous running of SM gauge couplings ii) a conformal contribution to SM gauge boson scattering induced by 5D gravity. Constraining these effects puts an upper bound on the 5D EFT cutoff, implying that the warped braneworld hypothesis could — at least in principle — be tested completely.

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Additional Information:© 2020 The Authors. This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited. Article funded by SCOAP3. Received: January 18, 2020; Revised: March 11, 2020; Accepted: March 17, 2020; Published: April 3, 2020. I thank P. Saraswat, P. Brax, S. Melville, M. Quiros, G. von Gersdorff and T. Gherghetta for useful discussions. The author is supported by the São Paulo Research Foundation (FAPESP) under grants #2011/11973, #2014/21477-2 and #2018/11721-4, and funded in part by the Gordon and Betty Moore Foundation through a Fundamental Physics Innovation Visitor Award (Grant GBMF6210).
Group:Walter Burke Institute for Theoretical Physics
Funding AgencyGrant Number
Fundação de Amparo à Pesquisa do Estado de Sao Paulo (FAPESP)2011/11973
Fundação de Amparo à Pesquisa do Estado de Sao Paulo (FAPESP)2014/21477-2
Fundação de Amparo à Pesquisa do Estado de Sao Paulo (FAPESP)2018/11721-4
Gordon and Betty Moore FoundationGBMF6210
Subject Keywords:Field Theories in Higher Dimensions; Beyond Standard Model; Effective Field Theories
Issue or Number:4
Record Number:CaltechAUTHORS:20200403-154046735
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Official Citation:Fichet, S. Braneworld effective field theories — holography, consistency and conformal effects. J. High Energ. Phys. 2020, 16 (2020).
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:102337
Deposited By: Tony Diaz
Deposited On:03 Apr 2020 22:50
Last Modified:16 Nov 2021 18:11

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