Math Phys/Phys seminar

### Speaker: Jens H. Bárðarson, KTH Stockholm

### Title: On the chiral anomaly in Weyl semimetals

Location: VR-II 158

Time: Tuesday December 4, at 13.30

### Abstract:

I will give an introduction to the physics of Weyl semimetals focussing on Fermi arcs and chiral anomaly. I will then discuss some transport properties of Weyl semimetals including strongly angular-dependent magnetotransport in the presence of long range disorder, and the difference between the longitudinal conductance in the presence of magnetic field and chiral pseudo-magnetic field. The latter points in opposite direction for opposite chiralities and can be induced, for example, by strain. This leads to a discussion of pseudo-landau levels and their connection with Fermi arcs and covariant and consistent chiral anomaly. I will also mention a new axial torsional contribution to the axial anomaly.

Math Phys seminar

### Speaker: Aruna Rajagopal, University of Iceland

### Title: Shock and Rarefaction Waves in Out of Equilibrium Lifshitz Fluids

Location: VR-II 155

Time: Thursday November 22 at 13.30

### Abstract:

Motivated by the recent developments and interest in the emergence of a non equilibrium steady state or NESS, for a relativistic fluid, and its possible holographic dual, we follow a similar framework to study the properties of such a state for a non-relativistic Lifshitz fluid with a general scaling exponent. This is carried out by solving the Riemann problem for the NESS which develops between two semi-infinite heat reservoirs that are brought into contact, and studying the shock and rarefaction waves which emerge as solutions to this problem.

Math Phys seminar

### Speaker: Daniel Areán, IFT Madrid

### Title: Breaking translations in AdS/CMT: Holographic Bad Metals

Location: Naustið (Endurmenntun)

Time: Wednesday October 24, 13.30 – 14.30

### Abstract:

We present holographic models realizing the pseudo-spontaneous breaking of translations. We study the electrical transport of these solutions finding that they reproduce features characteristic of the bad metallic transport observed in the cuprates.

Math Phys seminar

### Speaker: Tobias Zingg, Nordita

### Title: plasmons and physical density-density response from holography

Place: Aðalbygging A-069

Time: Thursday October 4, at 1.20 – 2.20 pm

### Abstract:

The holographic correspondence can be extended to identify plasmonic excitations in strongly correlated systems. These modes have relevance in the growing field of plasmonics, and play also a crucial role in relating properties of holographic ‘screened’ density-density response response functions to ‘physical’ density-density response functions, with the latter being the quantity actually related to experimental observation.

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.

Lecture

### Speaker: Andreas Ulovec, University of Vienna

Title: MSc4All – Motivating Methods and Materials in Maths and Science

Location: H203, Stakkahlíð — Menntavísindasviði HÍ.

Time: Friday 16. May, at 14:00.

### Abstract:

The Comenius projects “PROMOTE MSc” and “MOTIVATE ME in Maths and Science” developed both materials (PROMOTE) and teaching methods (MOTIVATE) for one common goal: To increase students’ motivation in learning Mathematics and Science. Both projects produced very positively evaluated materials in book format:

- unit descriptors (short summaries) of teaching materials
- sample units of full teaching materials
- compendium with a list and concise description of 24 teaching methods
- case studies demonstrating the teaching methods using the PROMOTE teaching materials

All the materials are also available online for free. The materials have been used in teacher training and in schools now for several years, resulting in a lot of feedback, which has been used to improve the materials.

In this talk we will give an overview of the previous and current projects, and present improved versions of the project materials, i.e. teaching units that have been developed to motivate students to learn mathematics and science. Print versions (in English) of the materials will be given out at the presentation free of charge.