# Shell EFT, Everywhere, All Orders at Once

- Institution: CERN
- Speaker: Dimitri Kosmopoulos
- Year: 2026
- Language: English
- Source: [CERN](https://videos.cern.ch/record/3023662)
- Licence: [CERN](https://copyright.web.cern)
- Who can watch: Teens profiles and older (sources give no ratings; placed by Invisible Network from the source's own words)

A key property that shapes the gravitational waveform of binary systems is the tidal deformability of their constituents, quantified by the Love numbers. In modern treatments of the gravitational two-body problem, the binary dynamics are described within an effective field theory (EFT), where Love numbers enter as Wilson coefficients encoding the finite-size response of each object. In this talk, I will introduce Shell Effective Field Theory, a new framework for computing the classical gravitational dynamics of compact objects, with particular emphasis on extracting Love numbers. By combining techniques from quantum field theory with solutions to black-hole perturbation theory, Shell EFT circumvents the loop integrations that constitute the main bottleneck in conventional approaches. I will present new results for dynamical Love numbers of generic compact objects through order G^9, corresponding to an eight-loop calculation, and conjecture their all-orders structure in the case of a Schwarzschild black hole.

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## Lectures

1. [Shell EFT, Everywhere, All Orders at Once](https://invisiblenetwork.ai/learn/cern/3023662/b8bf8d03b913), 1 h 4 min (CERN's player)