Weakly coupled gravity beyond general relativity

We explore four-dimensional (4D) weakly coupled gravity beyond general relativity in an on-shell language, focusing on the graviton three-point vertex. This admits a novel structure which can be attributed to a term cubic in the Riemann tensor. We consider a generalization of the Shapiro time delay...

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Detalles Bibliográficos
Publicado: 2015
Materias:
Beyond general relativity
causality, gravity and string theory
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_02182718_v24_n12_p_Camanho
http://hdl.handle.net/20.500.12110/paper_02182718_v24_n12_p_Camanho
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_02182718_v24_n12_p_Camanho
record_format dspace
spelling paper:paper_02182718_v24_n12_p_Camanho2023-06-08T15:21:31Z Weakly coupled gravity beyond general relativity Beyond general relativity causality, gravity and string theory We explore four-dimensional (4D) weakly coupled gravity beyond general relativity in an on-shell language, focusing on the graviton three-point vertex. This admits a novel structure which can be attributed to a term cubic in the Riemann tensor. We consider a generalization of the Shapiro time delay experiment that involves polarized gravitons and show that the new vertex leads to causality violation. Fixing the problem demands the inclusion of an infinite tower of massive higher spin states. Perturbative string theory provides an example of this phenomenon, the only known so far. Interestingly enough, the same argument being applied to inflation suggests that stringy signatures may be hidden in the non-Gaussianities of the primordial gravity wave spectrum. © 2015 World Scientific Publishing Company. 2015 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_02182718_v24_n12_p_Camanho http://hdl.handle.net/20.500.12110/paper_02182718_v24_n12_p_Camanho
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Beyond general relativity
causality, gravity and string theory
spellingShingle Beyond general relativity
causality, gravity and string theory
Weakly coupled gravity beyond general relativity
topic_facet Beyond general relativity
causality, gravity and string theory
description We explore four-dimensional (4D) weakly coupled gravity beyond general relativity in an on-shell language, focusing on the graviton three-point vertex. This admits a novel structure which can be attributed to a term cubic in the Riemann tensor. We consider a generalization of the Shapiro time delay experiment that involves polarized gravitons and show that the new vertex leads to causality violation. Fixing the problem demands the inclusion of an infinite tower of massive higher spin states. Perturbative string theory provides an example of this phenomenon, the only known so far. Interestingly enough, the same argument being applied to inflation suggests that stringy signatures may be hidden in the non-Gaussianities of the primordial gravity wave spectrum. © 2015 World Scientific Publishing Company.
title Weakly coupled gravity beyond general relativity
title_short Weakly coupled gravity beyond general relativity
title_full Weakly coupled gravity beyond general relativity
title_fullStr Weakly coupled gravity beyond general relativity
title_full_unstemmed Weakly coupled gravity beyond general relativity
title_sort weakly coupled gravity beyond general relativity
publishDate 2015
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_02182718_v24_n12_p_Camanho
http://hdl.handle.net/20.500.12110/paper_02182718_v24_n12_p_Camanho
_version_ 1768543081109389312

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