Theory at sea 2026

Session

15 minute talks - Day 2

5 Jun 2026, 15:00

Vayamundo Oostende

161. Feynman variational principle and other analytic approaches to polarons in tight-binding conduction bands

Serghei Klimin (U Antwerpen)

05/06/2026, 15:00

We develop and compare analytical approaches for the polaron problem in finite-width, non-parabolic conduction bands [1, 2]. We revisit analytical methods originally formulated for continuum polarons, including canonical transformations and improved self-consistent Wigner–Brillouin approximations, and generalize them to lattice systems. In a finite-bandwidth lattice, these approaches exhibit...

162. Bremsstrahlung function in superconformal gauge theories

Paolo Vallarino (VUB)

05/06/2026, 15:15

The radiation emitted by an accelerated charged particle is one of the most basic observables in gauge theories and is governed by the Bremsstrahlung function. While this quantity can be computed exactly in Maxwell theory, its generalization to non-Abelian gauge theories is far more intricate. In superconformal field theories, however, the enhanced symmetry structure provides powerful tools to...