Causality constraints in quadratic gravity

Show simple item record Edelstein, Jose D. Ghosh, Rajes Laddha, Alok Sarkar, Sudipta
dc.coverage.spatial Germany 2021-10-08T05:30:46Z 2021-10-08T05:30:46Z 2021-09
dc.identifier.citation Edelstein, Jose D.; Ghosh, Rajes; Laddha, Alok and Sarkar, Sudipta, "Causality constraints in quadratic gravity", Journal of High Energy Physics, DOI: 10.1007/JHEP09(2021)150, vol. 2021, no. 9, Sep. 2021. en_US
dc.identifier.issn 1126-6708
dc.identifier.issn 1029-8479
dc.description.abstract Classifying consistent effective field theories for the gravitational interaction has recently been the subject of intense research. Demanding the absence of causality violation in high energy graviton scattering processes has led to a hierarchy of constraints on higher derivative terms in the Lagrangian. Most of these constraints have relied on analysis that is performed in general relativistic backgrounds, as opposed to a generic solution to the equations of motion which are perturbed by higher curvature operators. Hence, these constraints are necessary but may not be sufficient to ensure that the theory is consistent. In this context, we explore the so-called CEMZ causality constraints on Quadratic Gravity in a space of shock wave solutions beyond GR. We show that the Shapiro time delay experienced by a graviton is polarization-independent and positive, regardless of the strength of the gravitational couplings. Our analysis shows that as far as the causality constraints are concerned, albeit inequivalent to General Relativity due to additional propagating modes, Quadratic Gravity is causal as per as the diagnostic proposed by CEMZ.
dc.description.statementofresponsibility by Jose D. Edelstein, Rajes Ghosh, Alok Laddha and Sudipta Sarkar
dc.format.extent vol. 2021, no. 9
dc.language.iso en_US en_US
dc.publisher Springer Verlag en_US
dc.subject Gravitational interaction en_US
dc.subject CEMZ en_US
dc.subject Lagrangian en_US
dc.subject Quadratic Gravity en_US
dc.subject Gravitational couplings en_US
dc.title Causality constraints in quadratic gravity en_US
dc.type Article en_US
dc.relation.journal Journal of High Energy Physics

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