Irish Theoretical Physics Meeting 2023

Contribution List

47. Masud Haque - Approaching the classical limit of Lindblad dynamics --- emergence of limit cycles, fixed points and algebraic decay

06/09/2023, 11:20

Seminar

Iconic features of classical dissipative dynamics include persistent limit-cycle oscillations and critical slowing down at the onset of such oscillations, whereby the system relaxes purely algebraically in time. On the other hand, quantum systems subject to generic Markovian dissipation decohere exponentially in time, approaching a unique steady state. Here we show how coherent limit-cycle...

49. Phillip Cussen Burke - Temperature in finite isolated quantum systems

06/09/2023, 12:00

Seminar

The concept of connecting quantum mechanical systems to statistical mechanics often arises in the study of "thermalization" in isolated many-body systems. One fundamental challenge in establishing this connection is the definition of temperature. In this talk, we explore two approaches to defining temperature in such systems.

First, we will introduce a definition of temperature inspired by...

13. Lars Fritz - New insights into the physics of ultraclean two-dimensional metals

06/09/2023, 14:20

Seminar

In this talk I will first review some of the properties of two-dimensional hydrodynamic electrons. An aspect of these systems which has not received a lot of attention is the role of interactions and associated collective excitations. I will show that they can make sizeable contributions, especially to transport properties

14. R. Moessner. (O'Raifeartaigh lecture) -Dynamical fractal in a clean topological magnet

06/09/2023, 15:00

Fractals -- objects with non-integer dimensions -- occur in manifold settings and length scales in nature, ranging from snowflakes and lightning strikes to natural coastlines. Much effort has been expended to generate fractals for use in many-body physics. Here, we identify an emergent dynamical fractal in a disorder-free, stoichiometric three-dimensional magnetic crystal in thermodynamic...

29. Weird Matter at MU

06/09/2023, 18:35

Seminar

https://www.eventbrite.ie/e/weird-matter-at-mu-tickets-698896978677

Maynooth University and the Dublin Institute for Advanced Studies invite you to a night of science celebrating the weird and wonderful ways matter can manifest in our universe.

In the first of two back-to-back general audience talks, Prof. Roderich Moessner (MPI-PKS and this year’s O’Raifeartaigh speaker at ITP2023)...

55. Dale Lawlor - On the speed of sound in dense QC$_2$D

07/09/2023, 09:30

Seminar

A quick update

3. Aradhita Chattopadhyaya - Instanton partition functions in Vafa Witten theory

07/09/2023, 10:10

Seminar

We analyze the coefficients of partition functions of Vafa-Witten theory
for the complex projective plane $\mathbb{CP}^2$. We first introduce the topologically twisted super Yang Mills theory also called Vafa Witten theory on $\mathbb{CP}^2$ whose instanton partition functions can be obtained using algebraic geometry methods. We experimentally study the growth of the
coefficients for gauge...

20. L. Borsten - Homotopy algebras, colour–kinematics duality, the double copy.

07/09/2023, 11:10

Seminar

The string of possibly cryptic words in the title will be discussed. Neither prior knowledge nor interest in all of the terms is assumed. We hope there is something for everyone! Essentially, two ideas that we find interesting will be brought together:

Scattering amplitudes are the most direct bridge between quantum field theory and particle collider experiments. They are also incredibly...

6. Marc Casals - Effects of quantum fields inside black holes

07/09/2023, 11:50

Seminar

All black holes in the Universe are believed to be rotating. This poses interesting questions, since rotating black hole solutions of Einstein’s equations of General Relativity possess a so-called Cauchy horizon in their interior, which threatens the predictability of Einstein’s theory. This then begs the question of whether such inner Cauchy horizons are still present after taking into...

23. J. Caetano - Large Charge 't Hooft Limit of N = 4 Super Yang-Mills

07/09/2023, 14:20

Seminar

In this talk, I will show that the large charge sector of the SU(2) N=4 SYM provides a solvable corner of the theory which exhibits striking similarities with the standard planar limit. In particular, I will describe how to compute the spectrum of local operators and higher point correlation functions involving two large charge operators and several light operators.

24. M. Walters - A New Framework for Strongly-Coupling Physics

07/09/2023, 15:00

Seminar

While quantum field theory has given us a successful description of physical phenomena at many different length scales, almost all computations are currently limited to systems which are weakly-coupled. I will present a new theoretical framework for solving general strongly-interacting physical systems, which uses universal short-distance data to numerically compute long-distance observables....

4. Swapnamay Mondal - Supersymmetric black holes and $T\bar{T}$ deformation

07/09/2023, 16:00

Seminar

The entropy of supersymmetric black holes in string theory compactifications can be related to that of a D- or M-brane system, which in many cases can be further reduced to a two-dimensional conformal field theory (2d CFT). For black holes in M-theory, this relation involves a decoupling limit where the black hole mass diverges. We suggest that moving away from this limit corresponds to a...

27. Ronan McNulty - Understanding QCD: searching for the glueball and the odderon.

07/09/2023, 16:40

Seminar

The strong force is the least precisely tested constituent of the Standard Model due to our inability to make precise predictions at low energies. Colour-charged objects can not be isolated and while the quark model describes most observed hadrons, the expected binding of gluons to form real or virtual states is less clearly understood. Recent and prospective results from the LHC that...

56. Ronan McNulty - Ireland and CERN

07/09/2023, 17:05

Seminar

In November 2022, Minister Harris announced that his department would prepare a submission for Government to consider joining CERN. The current status, roadmap, and opportunities of this announcement will be reviewed from the perspective of the Irish CERN users community.

7. Aoibhinn Gallagher - The Evolution of Cosmic Voids in the Schrodinger Poisson Formalism

08/09/2023, 09:50

Seminar

We investigate the evolution of cosmic voids in the Schr\"{o}dinger-Poisson formalism, finding wave-mechanical solutions for the dynamics in a standard cosmological background with appropriate boundary conditions. We compare the results in this model to those obtained using the Zel'dovich approximation. We discuss the advantages of studying voids in general and the advantages of...

54. Hannah O'Brennan - Predicting the number density of heavy-seed massive black holes due to an intense Lyman-Werner field

08/09/2023, 10:10

Seminar

A plausible origin of supermassive black holes (M ≥ 1e6 solar masses) which fuel bright active galactic nuclei (L > 1e47 erg /s) at galactic centres are so-called heavy-seed black holes that have formed in the early Universe (z>15). These heavy seeds are theorised to have masses of 1e3 to 1e5 solar masses.
Gravitational waves (GWs) from their mergers would have a frequency range of 1e-4 to...

48. John Brennan - Accelerating Astrophysics Simulations with Neural Networks

08/09/2023, 10:30

Seminar

33. Cora Uhlemann - Large-deviation statistics for the cosmic large-scale structure

08/09/2023, 11:10

Seminar

8. Eoin O Colgain - In search of signatures of Lambda-CDM model breakdown

08/09/2023, 11:50

Seminar

Lambda-CDM (LCDM) cosmology suffers from a longstanding cosmological constant problem. Recently, tensions have appeared in cosmological data sets. Tensions (if not due to systematics) point to LCDM model breakdown. A tell-tale signature of model breakdown is evolution of LCDM parameters with redshift. Starting from purely mathematical arguments, moving through observations, I motivate the case...

37. Kay Lehnert - Artificial Insights into String Theory - What ChatGPT (doesn't) know about the Swampland and why it's useful anyway.

08/09/2023, 14:20

Seminar

34. Des Johnston - (Wealth) Condensation

08/09/2023, 15:00

Seminar

We discuss a simple statistical mechanical model - the "zeta-urn" model, which displays a real space condensation transition. In the model L (indistinguishable) balls are distributed amongst N boxes and L, N are sent to infinity at some fixed ratio. The weight $p(n)$ for having n balls in a box is $1/n^{\beta}$.
Since the simplicity of the model allows for explicit evaluation of the...

39. C Nash - Entropy de Sitter space and von Neumann algebras

09/09/2023, 09:30

Seminar

I will discuss recent work connected with the title.

40. A Hunter-McCabe - The Unruh Effect and Shaking Photons From the Vacuum

09/09/2023, 10:30

Seminar

Acceleration radiation—or Unruh radiation—the thermal radiation observed by an ever-accelerating observer or detector, although having similarities to Hawking radiation, so far has proved extremely challenging to observe experimentally. One recent suggestion is that, in the presence of a mirror, constant acceleration of an atom in its ground state can excite the atom while at the same time...

46. T Tchrakian - Skyrme--Chern-Simons densities in all dimensions

09/09/2023, 11:25

Seminar

I present the prescription for constructing Skyrme--Chern-Simons densities in all dimensions. These are related to Witten's Anomalies in 3+1 dimensions. One example in 2+1 dimensions is presented.

43. D Johnston - Renormalization/Renormalisation

09/09/2023, 12:00

Seminar

Brian has remained studiously neutral in the great transatlantic debate on how to spell renormalisation/renormalization, with 4 papers on each.

I'll discuss one of his earlier works on renormalization.

45. R Szabo - Double Copy of Noncommutative Gauge Theory

09/09/2023, 14:00

Seminar

This talk will summarise recent work attempting to understand how standard noncommutative gauge theories, such as those which arise naturally from string theory, fit into the paradigm of colour-kinematics duality and the double copy of gauge theory to gravity. Along the way we shall encounter some novel noncommutative scalar field theories with rigid colour symmetry that have no commutative...

42. D O'Connor - The confining/de-confining phase transition, lessons from matrix models.

09/09/2023, 14:45

Seminar

9. Enhanced shortcut to adiabaticity in internal Josephson Junction

Poster

We investigate the preparation of spin-squeezed states in internal Bosonic Josephson Junction, where the interaction strength of the states can be controlled.
This problem has already been treated using the technique called Shortcut to Adiabaticity (STA), albeit in an approximate version.
In this work we devise and implement a novel, enhanced STA type protocol called eSTA.
This purely...