Emergent Symmetries in Particle Physics, Cosmology and Condensed Matter Systems

Session

Morning session

20 Jun 2018, 10:00

Auditorium D (Niels Bohr Institute)

2. Igor Herbut: "Fixed point collisions and tensor order parameters in Luttinger semimetals and some popular field theories"

20/06/2018, 10:00

Luttinger semimetals are ubiquitous electronic systems that have their chemical potential right at the point where two bands touch quadratically. They can be understood as higher-spin cousins of the better-known Weyl semimetals, and turn out to be more susceptible to effects of electron-electron interaction. I will discuss the possibility of a non-trivial scale-invariant infrared fixed point...

3. Carlos Hoyos: "Impurities and holography"

20/06/2018, 11:15

The Sachdev-Ye-Kitave model (SYK) and generalizations consist of quantum mechanical theories with an emergent conformal symmetry in the IR. It has been proposed that these theories serve as toy models of black holes in an emergent holographic dual description. I review the main features of this proposal and discuss similarities between SYK models and other systems such as magnetic impurities...

4. Jelle Hartong: "Fluid Dynamics for Systems without Boost Invariance"

20/06/2018, 12:00

There are many systems in physics whose hydrodynamic limit requires a formulation of fluid dynamics in the absence of boost symmetries. Such a theory of hydrodynamics has so far not been considered in generality. In this talk I will present this theory for perfect fluids, and then generalize it to include first order transport coefficients such as viscosities and conductivities. It will be...

7. Roderich Moessner: "An Ising model with emergent U(1) gauge field and SU(2) symmetry"

21/06/2018, 10:00

15. Ajit Balram: "Particle-hole symmetry for composite fermions: An emergent symmetry in the fractional quantum Hall effect"

21/06/2018, 11:15

The particle-hole (PH) symmetry of electrons is an exact symmetry of the Coulomb Hamiltonian confined to a specific Landau level, and its interplay with the formation of composite fermions (CFs) has attracted much attention of late. In this talk, I will describe an emergent symmetry in the fractional quantum Hall effect, namely, the PH symmetry of composite fermions, which relates states of...

9. Sung-Sik Lee: "Emergent gravity from relatively local Hamiltonians"

21/06/2018, 11:45

Keywords : gravity from quantum matter, emergent locality

13. Raúl Carballo-Rubio: "Emergence of gauge symmetries: a working example"

22/06/2018, 10:00

In this talk I will present an emergent theory of electromagnetism as
a working example of how gauge symmetries can emerge from systems with a priori no such symmetries. The theory is inspired by the physics of the superfluid phases of Helium 3. I will discuss the main ingredients of this concrete emergence mechanism and show how one can describe it from two slightly different...

14. Kevin Grosvenor: "Nonrelativistic Naturalness and the question of Emergent Lorentz Symmetry"

22/06/2018, 11:15

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.

8. Michele Burrello: "Topological Semimetals in Artificial Gauge Potentials"

22/06/2018, 11:45

In the last years, several research groups worldwide managed to reproduce the
physics of Weyl fermions and to obtain the exotic features of topological
semimetals in different condensed matter setups, including not only solid state compounds,
but also photonic crystals. In this talk I will introduce the main features
of these gapless 3D topological states of matter and I will focus...