Dr. Athanasios Bakopoulos, "Compact objects with primary hair in shift and parity symmetric beyond Horndeski gravities"

Thursday 28 Mar 2024, 17:00 → 19:00 Asia/Seoul

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We present explicit black holes endowed with primary scalar hair within the shift-symmetric subclass of beyond Horndeski theories. These solutions depend, in addition to the conventional mass parameter, on a second free parameter encoding primary scalar hair. We also present an explicit algorithm to extract static and spherically symmetric black holes with primary scalar charge adhering to the conservation of the Noether current emanating from the shift symmetry. We show that when the functionals $G_2$​ and $G_4$​ of the theory are linearly dependent, analytic homogeneous black-hole solutions exist, which can become regular by virtue of the primary charge contribution. Such geometries can easily enjoy the preservation of the Weak Energy Conditions, elevating them into healthier compact objects than most hairy black holes in modified theories of gravity. Finally, we revisit the concept of disformal transformations as a solution-generating mechanism and discuss the case of generic $G_2$​ and $G_4$​ ​ functionals.The talk will be based on arXiv 2310.11919 [gr-qc] and 2312.17198 [gr-qc].

 

ZOOM Link :

https://us06web.zoom.us/j/4768822533?pwd=HH2TUTGzTfBdVVFiOTLY1HQbrFnqjz.1