PIRSA:24030124

Love and Naturalness

Ivanov, M. (2024). Love and Naturalness. Perimeter Institute. https://pirsa.org/24030124

Ivanov, Mikhail. Love and Naturalness. Perimeter Institute, Mar. 28, 2024, https://pirsa.org/24030124 

          @misc{ pirsa_PIRSA:24030124,
            doi = {10.48660/24030124},
            url = {https://pirsa.org/24030124},
            author = {Ivanov, Mikhail},
            keywords = {Strong Gravity},
            language = {en},
            title = {Love and Naturalness},
            publisher = {Perimeter Institute},
            year = {2024},
            month = {mar},
            note = {PIRSA:24030124 see, \url{https://pirsa.org}}
          }

Mikhail Ivanov

Massachusetts Institute of Technology (MIT)

Talk number
PIRSA:24030124
Collection
Talk Type
Subject
Abstract

Recent progress in gravitational wave astronomy has spurred the development of efficient tools to describe gravitational binary dynamics. One such tool is classical worldline effective field theory (EFT). In the first part of my talk, I will show how to use this EFT for systematic studies of tidal heating and deformations (Love numbers) of compact objects. I will present a gauge-invariant definition of Love numbers and show how to extract them in a coordinate-independent way from scattering amplitudes of the gravitational Raman process. I will show that the worldline EFT exhibits strong fine-tuning when applied to black holes. This gives rise to a naturalness paradox associated with the vanishing of black hole static Love numbers. In the second part of my talk, I will present a new symmetry of black holes (Love symmetry) that elegantly resolves this paradox. The Love symmetry is tightly connected to isometries of extremal black holes that appear in many holographic constructions. It also provides a curious example of IR/UV mixing, which may give insights for other hierarchy problems.

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