Beyond Lorentzian Geometry

Contribution List

1. Oddities in non-relativistic strong gravity

Dieter Van den Bleeken

28/10/2019, 10:00

I will review the nonrelativisic, or large c, expansion of general relativity and will argue why dynamic matter that sources strong gravitational fields requires the presence of odd powers in this expansion. I will report on ongoing work constructing the effective non-relativistic theory including these odd terms. A number of other peculiarities of the strong field, nonrelativistic corner of...

2. Non-relativistic String Theory and Branes

Eric Bergshoeff

28/10/2019, 11:15

The aim of this talk is to describe what we can learn about basic non-relativistic brane solutions in non-relativistic string theory from non-relativistic T-duality in the same way that relativistic T-duality has been applied in the past to relate different relativistic brane solutions. The first part of the talk will be a review of non-relativistic string theory, the equations of motion of...

3. Maximally symmetric spacetimes reconsidered

Stefan Prohazka

28/10/2019, 12:10

Spacetimes, like Minkowski space, are omnipresent in physics. I will
introduce a recent classification of spacetimes that generalizes the
classification of maximally symmetric lorentzian geometries and
includes further physically interesting ones. Among them are galilean,
carrollian and aristotelian geometries for which there is renewed
interest due to applications in holography. These...

4. Soft degrees of freedom, Gibbons-Hawking contribution and Casimir effect

Glenn Barnich

28/10/2019, 14:30

The semiclassical contribution to the partition function is obtained by evaluating the Euclidean action improved through suitable boundary terms. We address the question of which degrees of freedom are responsible for this contribution. A physical toy model for the gravitational problem is a charged vacuum capacitor. For a planar charged vacuum capacitor with perfectly conducting plates, we...

5. Renormalization Group Flows of Scalar Galilean Electrodynamics in 2 + 1 Dimensions

Shira Chapman

28/10/2019, 15:45

I will discuss the theory of Galilean electrodynamics coupled to a single Schrödinger scalar in 2+1 dimensions. This theory, originally obtained from a null-reduction of relativistic Maxwell's theory coupled to a complex scalar field in 3+1 dimensions, suffers an infinite series of quantum corrections. I will explain how these corrections can be handled systematically using the background...

6. Quantum Critical and Supersymmetric Lifshitz Field Theories

Igal Arav

29/10/2019, 10:00

I will discuss non-boost-invariant field theories with "time domain" supersymmetry, in which the supersymmetric algebra closes on the Hamiltonian alone. I will briefly review the N=1 (two real supercharges) construction, and then introduce an N=2 family of field theories with four real supercharges and a holomorphic structure. I will show how this relatively simple construction exhibits some...

7. Non-relativistic gravity and strings

Niels Obers

29/10/2019, 11:15

I will start by motivating the recent interest in non-relativistic gravity and strings, and introduce the basics of Newton-Cartan geometry.
Newton-Cartan (NC) geometry was introduced more than 90 years ago in order to find a geometric formulation of Newtonian gravity. This geometry (including recent novel generalisation
and extensions) has gained renewed interest as it appears in a variety...

8. Non-relativistic Strings from Quantum Mechanics

Troels Harmark

29/10/2019, 12:10

This talk is about a new type of string theory with a non-relativistic conformal field theory on the world-sheet, as well as a non-relativistic target space geometry. Starting with the relativistic Polyakov action with a fixed momentum along a non-compact null-isometry, we can take a scaling limit that gives the non-relativistic string, including an interesting intermediate step. This can in...

9. Entanglement measures in generalised quantum Lifshitz models

Valentina Giangreco Puletti

29/10/2019, 14:30

The talk focusses on the computation and analysis of entanglement measures in generalised quantum Lifshitz models. These are free field theories with Lifshitz scaling symmetry which extend the (2+1)-dimensional quantum Lifshitz model to higher dimension, and provide us with simple models for non-relativistic critical theories. I will introduce various entanglement measures, such as...

10. Non-relativistic supersymmetry on curved backgrounds

Jan Rosseel

29/10/2019, 15:45

In this talk, I will briefly review how curved Riemannian manifolds, on which relativistic supersymmetric field theories can be defined, are found by studying a suitable set of differential Killing spinor equations. These Killing spinor equations are determined by the supersymmetry transformation rules of the fermionic fields of off-shell relativistic supergravity. I will then argue that one...

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