## 19-29 June 2018 – DIAS Summer School in High-Energy Astrophysics 2018

The **DIAS Summer School on High-Energy Astrophysics 2018** is the second summer school organised by the Centre for Astroparticle Physics and Astrophysics (CAPPA), part of the Dublin Institute for Advanced Studies (DIAS), and is hosted by Dublin City University (DCU). The school is aimed at motivated young researchers beginning their careers (in particular PhD students and young postdocs), with the a focus on “filling in the gap” between University education and University-level research. The first announcement can be found here.

More details can be found here : https://www.dias.ie/cappa/SummerSchool2018/

## Tuesday 20th March: STP Seminar – “From Hilbert’s 16th Problem to Physics”

**Title: **From Hilbert’s 16th Problem to Physics

**Speaker: **Charles Nash (NUI Maynooth)

**Abstract: **We shall describe a link between Hilbert’s sixteenth problem (part (i)) concerning real algebraic curves and condensed matter physics. The central result is some work of Kenyon and Okounkov (2006). The physics involves so called dimer problems for periodic bipartite and non-bipartite graphs. A differential geometric approach will be introduced to help clarify matters. It transpires that real K-theory underlies the systems studied.

**Time:** Tuesday 20th March 2018, 2.30pm.

**Place: **Lecture Room, School of Theoretical Physics, DIAS, 10 Burlington Road, Dublin 4.

## 8th March : International Women’s Day 2018

To celebrate International Women’s Day, we spoke to some of our female researchers here at DIAS about their careers. See what they had to say below! #IWD2018 ~~#~~internationalwomensday2018

## Tuesday 6th March: STP Seminar – “Quantum Correlations in Space & Time”

**Title: **Quantum Correlations in Space & Time

**Speaker: **Joe Fitzsimons (Singapore University of Technology and Design)

**Abstract: **In ordinary, non-relativistic, quantum physics, time enters only as a parameter and not as an observable: a state of a physical system is specified at a given time and then evolved according to the prescribed dynamics. While the state can, and usually does, extend across all space, it is only defined at one instant of time, in conflict with special relativity where space and time are treated on an equal footing. In this talk, I will examine the consequences of extending the notion of the quantum density matrix to multiple spatial and temporal measurements. To this end, I will introduce the concept of a pseudo-density matrix which treats space and time indiscriminately. This matrix in general fails to be positive for timelike separated measurements, motivating the definition of a measure of causality that discriminates between spacelike and timelike correlations. I will present the results of recent NMR experiments to measure causal correlations and their decay under the effects of noise. In the second half of the talk, I will present an application on the pseudo-density framework to bounding the capacity of quantum channels, and show how it can be used to obtain new bounds for the capacity of shifted depolarizing channels.

**Time:** Tuesday 6th March 2018, 2.30pm.

**Place: **Lecture Room, School of Theoretical Physics, DIAS, 10 Burlington Road, Dublin 4.

## 2018-02-25, M7.5 Papua New Giunea

On 25th February, 2018, an earthquake measuring magnitude 7.5 occurred at 4a.m local time, in a rural, jungle area of the Southern Highlands in New Guinea, Papaua New Guinea. It wasn’t immediately clear if there was damage. No tsunami watches or warnings were issued because of the quake.

At the location of this earthquake, the Australia plate is converging with the Pacific plate and it occurred as the result of thrust faulting at shallow a depth. Thrust-faulting events of the size of the February 25th, 2018 earthquake are typically about 85×30 km (length x width).

The earthquake was recorded at seismic stations worldwide, including stations of the Irish National Seismic Network (INSN), see seismic waveforms below (select figure to enlarge).

## Tuesday 27th February: STP Seminar – “Anomalous Transport”

**Title: **Anomalous Transport

**Speaker: **Karl Landsteiner (Universidad Autónoma de Madrid)

**Abstract: **The concept of symmetry is one cornerstone of modern theoretical physics, quantum mechanics is another. Sometimes they are incompatible with each other. These incompatibilities are called anomalies. They constrain possible fermion spectra of gauge theories and explain otherwise forbidden processes such as the decay of the neutral pion into two photons. In the recent years it has turned that anomalies have also profound impact on transport theory of relativistic matter. Anomalies induce exotic new transport phenomena such as the chiral magnetic and the chiral vortical effects. I will review anomaly induced transport phenomena and some of its applications in the quark gluon plasma and a in new exciting class of materials: the Weyl semimetals.

**Time:** Tuesday 27th March 2018, 2.30pm.

**Place: **Lecture Room, School of Theoretical Physics, DIAS, 10 Burlington Road, Dublin 4.

## M4.4 South Wales earthquake, 17th February 2018

An earthquake with magnitude 4.4 occurred in South Wales on the 17th February 2018 at 14:31:07.6 UTC. For more details please see this post on the INSN homepage.

## M7.2 Mexico earthquake, 16th February 2018

An earthquake with magnitude 7.2 occurred in southern Mexico on the 16th February 2018 at 23:39:39 UTC. For more details please see this post on the INSN homepage.

## Thursday 15th March: STP Seminar – “Einstein Gravity From Conformal Field Theory”

**Title: **Einstein Gravity From Conformal Field Theory

**Speaker: **Andrei Parnachev (TCD)

**Abstract: **We will analyse the Regge limit of certain four point functions in CFTs and will argue that holographic CFTs must be described by the Einstein gravity.

**Time:** Thursday 15th March 2018, 2.30pm.

**Place: **Lecture Room, School of Theoretical Physics, DIAS, 10 Burlington Road, Dublin 4.

## 2018-2-13 – Seminar by Ben Mather (DIAS)

**13 February 2018** – **Seminar
**

**When:** 16:00 on Tuesday, 13th February 2018

**Where:** DIAS, Geophysics Section, 5 Merrion Square, Dublin 2, (library)

**Speaker:** Ben Mather (DIAS, Dublin, Ireland)

**Title: **Estimating the depth to the Curie isotherm: a synthesis of the methodology and its application to Ireland.

**Abstract:**

Magnetic data is one of the most common geophysics datasets available on the surface of the Earth. At long wavelengths it pertains information on the depth at which rocks lose their magnetism. This is called the Curie depth – often interpreted as the 580C isotherm, which is the Curie point of magnetite. In this talk I will outline the methodologies to compute Curie depth and the resolution of thermal structures it can detect. The ongoing acquisition of the magnetic anomaly by Tellus presents a unique opportunity to glean precise estimates of the 580C isotherm, which can be assimilated into large scale thermo-chemical models of the lithosphere.