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Causal structure of higher curvature gravity

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dc.contributor.author MOHD, ALI en_US
dc.contributor.author VARDARAJAN, SUNEETA en_US
dc.date.accessioned 2025-07-31T03:59:30Z
dc.date.available 2025-07-31T03:59:30Z
dc.date.issued 2025-07 en_US
dc.identifier.citation Physical Review D, 112, 024063. en_US
dc.identifier.issn 2470-0010 en_US
dc.identifier.issn 2470-0029 en_US
dc.identifier.uri https://doi.org/10.1103/pzdl-crjb en_US
dc.identifier.uri http://dr.iiserpune.ac.in:8080/xmlui/handle/123456789/10338
dc.description.abstract In this paper, we analyze the causal structure of generalized quadratic gravity (GQG) and Einsteinian cubic gravity (ECG). It is well known that gravitons in higher-curvature theories can exhibit superluminal propagation, rendering the conventional definition of causal structures based on null curves inadequate. Instead, the causal structure must be defined using the fastest propagating modes, which travel along characteristic surfaces. The superluminal propagation in higher-curvature theories has significant implications for black holes. Specifically, if the Killing horizon of a black hole is not a characteristic surface corresponding to the fastest propagating mode, the horizon can no longer function as a causal barrier. Our analysis demonstrates that GQG with a genuine fourth-order equation of motion possesses only null characteristics, implying that the horizon is a characteristic surface. Furthermore, we perform a detailed characteristic analysis of ECG. We show that while all null surfaces are characteristic surfaces in ECG, the converse is not true—there exist non-null characteristic surfaces. In particular, we identify a non-null characteristic surface in a Type N spacetime in the algebraic classification of spacetimes. Despite the existence of multiple characteristic surfaces in ECG, we establish that the black hole horizon remains a characteristic surface. en_US
dc.language.iso en en_US
dc.publisher American Physical Society en_US
dc.subject Alternative gravity theories en_US
dc.subject Gravity in dimensions other than four en_US
dc.subject 2025-JUL-WEEK5 en_US
dc.subject TOC-JUL-2025 en_US
dc.subject 2025 en_US
dc.title Causal structure of higher curvature gravity en_US
dc.type Article en_US
dc.contributor.department Dept. of Physics en_US
dc.identifier.sourcetitle Physical Review D en_US
dc.publication.originofpublisher Foreign en_US


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