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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| Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_02182718_v24_n12_p_Camanho |
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todo:paper_02182718_v24_n12_p_Camanho2023-10-03T15:10:59Z Weakly coupled gravity beyond general relativity Camanho, X.O. Edelstein, J.D. Zhiboedov, A. 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. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar 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 |
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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 Camanho, X.O. Edelstein, J.D. Zhiboedov, A. 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. |
| format |
JOUR |
| author |
Camanho, X.O. Edelstein, J.D. Zhiboedov, A. |
| author_facet |
Camanho, X.O. Edelstein, J.D. Zhiboedov, A. |
| author_sort |
Camanho, X.O. |
| 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 |
| url |
http://hdl.handle.net/20.500.12110/paper_02182718_v24_n12_p_Camanho |
| work_keys_str_mv |
AT camanhoxo weaklycoupledgravitybeyondgeneralrelativity AT edelsteinjd weaklycoupledgravitybeyondgeneralrelativity AT zhiboedova weaklycoupledgravitybeyondgeneralrelativity |
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1807322223833251840 |