A study of quantum Lyapunov exponents and their numerical analytic continuation in low-dimensional quantum systems using exact diagonalization
The Banks-Fischler-Shenker-Susskind (BFSS) model is one of the popular microscopic models of black hole dynamics, capable of explaining how black holes scramble information. Studies of the BFSS model suggest that a microscopic mechanism of information scrambling by black holes is related to their intrinsically chaotic dynamics. In particular, BFSS model at high temperatures becomes very […]
Structure formation in fuzzy dark matter
PI: Anastasia Fialkov The fuzzy dark matter (FDM) scenario has received increased attention in recent years due to the small-scale challenges of the LCDM cosmological model and the lack of any experimental evidence for any candidate particle. In this DiRAC project, we use cosmological N-body simulations to investigate large-scale structure in FDM cosmologies. In Dome […]
Spontaneous Symmetry Breaking in the 3d Thirring Model ’22
PI: Simon Hands Institution: University of Liverpool The Thirring Model describes relativistic fermions moving in a two-dimensional plane and interacting via a contact term between conserved currents. The physical system it most resembles is low-energy electronic excitations in graphene. For free electrons at half-filling on a honeycomb lattice, conduction and valance bands form cones just […]
The impact of dynamical friction in gas on structure formation in the Universe
Project: dp134Author: Ben Morton (morton@roe.ac.uk)Team members: Prof. Sadegh Khochfar, Dr. Jose Onorbe Dynamical friction is the process by which a massive perturber, moving through some background medium, gravitationally interacts with that medium, producing a net retarding force to its motion. When the background medium is gaseous, the pressure forces present in the gas must be […]
3D high resolution (10243) hydrodynamics simulation of a type-II supernova explosion
This is a 3D high resolution (10243) hydrodynamics simulation of a type-II supernova explosion using the code AREPO. The outer boundary seen is the forward shock which results from the supernova explosion and which is expanding into a uniform interstellar medium. A number of instabilities develop at the supernova shock front creating the structure seen […]
The Gravitational Afterglow of Boson Stars
The theoretical framework of our current understanding of the Universe rests on two main pillars, the Standard Model (SM) of particle physics and Einstein’s theory of General Relativity (GR). This SM+GR framework provides us with an incredible power to explain and predict a plethora of phenomena in observations and experiment, ranging from the quantum behaviour […]
A method to reconstruct magnetic fields from multi-spacecraft measurements
Project title: Heating and Acceleration through Magnetic Reconnection in Space Plasma TurbulencePI: Daniel Verscharen (MSSL, University College London)DiRAC Resource: Data Intensive at Leicester (DIaL) Jeffersson A. Agudelo Rueda, Daniel Verscharen Advances in space technology have led to the dawn of a new era for multi-spacecraft science missions to explore our solar system. Missions such as […]
Impact crater scaling and inner solar system bombardment
DiRAC resource used: DiAL 2.5 PI: G.S. Collins The relationship between impact crater size and impactor properties, such as size and speed, is key to comparing impactor and crater populations on different planets and dating planetary surfaces. Most of our understanding of this relationship, however, comes from numerical simulations of vertical-incidence impacts, and laboratory impact […]
The Impact of Galaxy Formation on Dark Matter Halos
The dominant component of matter in the Universe is believed to be dark matter, an unknown subatomic particle that only interacts with ordinary matter via gravity. Through gravitational growth, dark matter forms into so-called halos, within these halos that the visible galaxies we see in the Universe form and grow. How galaxies form is a […]
Effect of stellar fly-bys on young planetary system architectures
The architectures of planetary systems discovered by Kepler are poorly understood. There are far more single-transiting planets than expected from the analysis of the number of multi-transiting systems, assuming that all planetary systems are co-planar. However, stars are not born in isolation, and interactions between stars can perturb their planetary systems. This project uses N-body […]