Math Phys seminar

### Speaker: Kevin John Torres Grosvenor, Niels Bohr Institute

### Title: Nonrelativistic Naturalness and the quest for Emergent Lorentz Symmetry

Location: V-147 (VR-II)

Time: Tuesday 22 May at 10:30

### Abstract:

I will discuss our proposal for a nonrelativistic solution to the Higgs mass hierarchy problem, its dependence on the emergence of various shift symmetries, and the role it might play in the search for a nonrelativistic theory of particle physics in which Lorentz symmetry emerges at “low” energies.

Math Phys seminar

### Speaker: Matteo Baggioli, Autonomous University of Barcelona

### Title: Holographic quantum phase transitions: time to get dirty!

Location: HB-5 (Háskólabíó)

Time: Monday 9 April at 10:50

### Abstract:

We study the effects of quenched one-dimensional disorder on the holographic Weyl semimetal quantum phase transition (QPT). We observe the smearing of the sharp QPT linked to the appearance of rare regions at the horizon where the local order parameter is non-zero. We discuss the role of the disorder correlation and we compare our results to the weakly coupled expectations from condensed matter theory and simulations. We analyze also the interplay of finite temperature and disorder and we find preliminary indications for the presence of log-oscillatory structures in the order parameter.