Physics

Abstract: Is there a geometric object underlying the cosmological wavefunction for Tr $\phi^3$ theory, just as associahedra underlie scattering amplitudes? In this talk, I will describe a new class of polytopes that answer this question. I will...

Abstract: I will discuss progress in the programme of establishing a holographic duality for regular tilings of hyperbolic space. As candidate boundary theories, we consider spin chains with aperiodic couplings whose ground state may be represented...

Abstract: In this talk, I will present recent advances in the understanding of mesonic bound states in 2d QCD, obtained by employing synergy integrability techniques and the S-Matrix bootstrap. This talk will be based on 2406.11078, 2312.15598 (with...

Abstract: Event Horizon Telescope studies prefer Magnetically Arrested Disk (MAD) accretion flows over their more weakly magnetized Standard and Normal Evolution (SANE) counterparts.  These models produce efficient jets via the Blandford-Znajek (BZ)...

Abstract: I will discuss dilaton gravity with a sine potential, where periodic shifts of the dilaton (that leave the potential invariant) are treated as a redundancy. Most things I will say hold true for generic periodic potentials, but the sine...

Abstract: Radio pulses from rotating neutron stars provide us with spectacularly accurate measurements of their spin frequencies. Surprisingly, young and middle-aged pulsars frequently exhibit irregular evolution of their spin frequencies, with long...

Abstract: I will discuss a geometric approach to the factorization puzzle that involves coadjoint orbits and Berry phases. The mathematical formalism introduced is applied both to quantum mechanics examples and to AdS/CFT.  It is shown how the...

Abstract: Consider the interaction of one-dimensional surface gravity waves on top of an ideal fluid of infinite depth. Notably, for certain orientations of the wave vectors, the interaction matrix element vanishes, while for other orientations, the...