Black hole tidal Love numbers and dissipation numbers in worldline effective field theory
MM Ivanov, Z Zhou - arXiv preprint arXiv:2208.08459, 2022 - arxiv.org
MM Ivanov, Z Zhou
arXiv preprint arXiv:2208.08459, 2022•arxiv.orgThe worldline effective field theory (EFT) gives a gauge-invariant definition of black hole
conservative tidal responses (Love numbers), dissipation numbers, and their spin-0 and
spin-1 analogs. In the first part of this paper we show how the EFT allows us to circumvent
the source/response ambiguity without having to use the analytic continuation prescription.
The source/response ambiguity appears if Post-Newtonian (PN) corrections to external
sources overlap with the response. However, these PN corrections can be clearly identified …
conservative tidal responses (Love numbers), dissipation numbers, and their spin-0 and
spin-1 analogs. In the first part of this paper we show how the EFT allows us to circumvent
the source/response ambiguity without having to use the analytic continuation prescription.
The source/response ambiguity appears if Post-Newtonian (PN) corrections to external
sources overlap with the response. However, these PN corrections can be clearly identified …
The worldline effective field theory (EFT) gives a gauge-invariant definition of black hole conservative tidal responses (Love numbers), dissipation numbers, and their spin-0 and spin-1 analogs. In the first part of this paper we show how the EFT allows us to circumvent the source/response ambiguity without having to use the analytic continuation prescription. The source/response ambiguity appears if Post-Newtonian (PN)corrections to external sources overlap with the response. However, these PN corrections can be clearly identified and isolated using the EFT. We illustrate that by computing static one-point functions of various external fields perturbing the four-dimensional Schwarzschild geometry. Upon resumming all relevant Feynman diagrams, we find that the PN terms that may mimic the response actually vanish for static black holes. Thus, the extraction of Love numbers from matching the EFT and general relativity (GR) calculations is completely unambiguous, and it implies that the Love numbers vanish identically for all types of perturbations. We also study in detail another type of fine tuning in the EFT, the absence of Love numbers' running. We show that logarithmic corrections to Love numbers do stem from individual loop diagrams in generic gauges, but cancel after all diagrams are summed over. In the particular cases of spin-0 and spin-2 fields the logarithms are completely absent if one uses the Kaluza-Klein metric decomposition. In the second part of the paper we compute frequency-dependent dissipative response contributions to the one-point functions using the Schwinger-Keldysh formalism. We extract black hole dissipation numbers by comparing the one-point functions in the EFT and GR. Our results are in perfect agreement with those obtained from a manifestly gauge-invariant matching of absorption cross-sections.
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