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Emergent Symmetries in Particle Physics, Cosmology and Condensed Matter Systems

20–22 Jun 2018
Niels Bohr Institute
Europe/Copenhagen timezone

Contribution List

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16. Welcome and Introduction to the NBIA: Andrew Jackson
20/06/2018, 09:50
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...
5. Jan de Boer: "Emergent symmetries in AdS/CFT"
20/06/2018, 14:15

It is possible to derive effective actions for fluids using the AdS/CFT correspondence. Recent work
on effective actions for fluids has suggested that these actions should be governed by new, somewhat
mysterious symmetries. In this talk I will try to explain a possible gravitational origin of these symmetries.
6. Netta Engelhardt: "Emergent Causality in Holography"
20/06/2018, 15:30

I will discuss an approach to indeed the emergence of causality from a new construct, the causal density matrix. This framework provides a sufficient and necessary condition for a quantum field theory to have a holographic dual with semi classical causal structure. I will discuss several applications of the causal density matrix.
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
10. Marika Taylor: "Holography beyond conformality"
21/06/2018, 14:00

The original examples of dualities between gravity and quantum field theories involved conformal field theories, both in conformal phases and in spontaneously/explicitly broken symmetry phases. In this talk we will discuss geometric duals of irrelevant deformations of conformal field theories. While generically irrelevant deformations are viewed as being uncontrolled, holography picks out...
12. John Toner: "Fish Gotta swim, birds gotta fly, I gotta do Feynmann graphs 'til I die: A continuum theory of flocking"
21/06/2018, 15:15

Flocking - i.e., the collective motion of large numbers of self-propelled entities - provides a classic illustration of the differences between equilibrium and non-equilibrium systems. Like an equilibrium ferromagnet, a non-equilibrium flock breaks rotation invariance by spontaneously choosing a direction of motion. Unlike a ferromagnet, it can even do so in two dimensions, in apparent...
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...
1. Carlos Hoyos
11. Coffee
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