Mark Hindmarsh
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View article: High frequency gravitational wave plotter: Stochastic signals
High frequency gravitational wave plotter: Stochastic signals Open
HFGWplotter_Omega: Gravitational Waves Plotter for stochastic signals and power-law-integrated sensitivities Created by Francesco Muia, Andreas Ringwald and Carlos Tamarit. Code maintained by Carlos Tamarit Credit for the data of the plots…
View article: Acoustic gravitational waves beyond leading order in bubble over Hubble radius
Acoustic gravitational waves beyond leading order in bubble over Hubble radius Open
We calculate the gravitational wave power spectrum from sound waves in a cosmological first order phase transition in the unexplored regime of large bubbles, by which we mean that the mean bubble spacing $R_*$ is a non-negligible fraction …
View article: Recovering a phase transition signal in simulated LISA data with a modulated galactic foreground
Recovering a phase transition signal in simulated LISA data with a modulated galactic foreground Open
Stochastic backgrounds of gravitational waves from primordial first-order phase transitions are a key probe of physics beyond the Standard Model. They represent one of the best prospects for observing or constraining new physics with the L…
View article: Scaling density of axion strings in terasite simulations
Scaling density of axion strings in terasite simulations Open
We report on a study of axion string networks using fixed-grid simulations of up to 16384 points per side. The length of string can be characterized in terms of standard dimensionless parameters ζw and ζr, the length density measured in th…
View article: Signatures of the speed of sound on the gravitational wave power spectrum from sound waves
Signatures of the speed of sound on the gravitational wave power spectrum from sound waves Open
Future space-based interferometers offer an unprecedented opportunity to detect signals from the stochastic gravitational wave background originating from a first-order phase transition at the electroweak scale. The phase transition is acc…
View article: Revised bounds on local cosmic strings from NANOGrav observations
Revised bounds on local cosmic strings from NANOGrav observations Open
In a recent paper, the NANOGrav collaboration studied new physics explanations of the observed pulsar timing residuals consistent with a stochastic gravitational wave background (SGWB) [1], including cosmic strings in the Nambu-Goto (NG) a…
View article: Animations from "Scaling density of axion strings in terasite simulations"
Animations from "Scaling density of axion strings in terasite simulations" Open
We report on a study of axion string networks using fixed-grid simulations of up to $16384$ points per side. The length of string can be characterised in terms of standard dimensionless parameters $ζ_\text{w}$ and $ζ_\text{r}$, the length …
View article: Primordial acoustic turbulence: Three-dimensional simulations and gravitational wave predictions
Primordial acoustic turbulence: Three-dimensional simulations and gravitational wave predictions Open
Gravitational waves (GWs) generated by a first-order phase transition at the electroweak scale are detectable by future space-based detectors like LISA. The lifetime of the resulting shock waves plays an important role in determining the i…
View article: Signatures of the speed of sound on the gravitational wave power spectrum from sound waves
Signatures of the speed of sound on the gravitational wave power spectrum from sound waves Open
Future space-based interferometers offer an unprecedented opportunity to detect signals from the stochastic gravitational wave background originating from a first-order phase transition at the electroweak scale. The phase transition is acc…
View article: Codes to reproduce results in "Recovering a phase transition signal in simulated LISA data with a modulated galactic foreground"
Codes to reproduce results in "Recovering a phase transition signal in simulated LISA data with a modulated galactic foreground" Open
This repository contains the codes needed to reproduce the data simulation, analysis, and plots from the paper Recovering a phase transition signal in simulated LISA data with a modulated galactic foreground by M. Hindmarsh, D. C. Hooper, …
View article: A-B Transition in Superfluid $$^3$$He and Cosmological Phase Transitions
A-B Transition in Superfluid $$^3$$He and Cosmological Phase Transitions Open
First-order phase transitions in the very early universe are a prediction of many extensions of the Standard Model of particle physics and could provide the departure from equilibrium needed for a dynamical explanation of the baryon asymme…
View article: Nanofluidic Platform for Studying the First-Order Phase Transitions in Superfluid Helium-3
Nanofluidic Platform for Studying the First-Order Phase Transitions in Superfluid Helium-3 Open
The symmetry-breaking first-order phase transition between superfluid phases $$^3$$ He-A and $$^3$$ He-B can be triggered extrinsically by ionising radiation or heterogeneous nucleation arising from the details of the sample cell con…
View article: Revised bounds on local cosmic strings from NANOGrav observations
Revised bounds on local cosmic strings from NANOGrav observations Open
In a recent paper, the NANOGrav collaboration studied new physics explanations of the observed pulsar timing residuals consistent with a stochastic gravitational wave background (SGWB), including cosmic strings in the Nambu-Goto (NG) appro…
View article: General relativistic bubble growth in cosmological phase transitions
General relativistic bubble growth in cosmological phase transitions Open
We use a full general relativistic framework to study the self-similar expansion of bubbles of the stable phase into a flat Friedmann-Lemaître-Robertson-Walker Universe in a first order phase transition in the early Universe. With a simple…
View article: A-B transition in superfluid 3He and cosmological phase transitions
A-B transition in superfluid 3He and cosmological phase transitions Open
First order phase transitions in the very early universe are a prediction of many extensions of the Standard Model of particle physics and could provide the departure from equilibrium needed for a dynamical explanation of the baryon asymme…
View article: Nanofluidic platform for studying the first-order phase transitions in superfluid helium-3
Nanofluidic platform for studying the first-order phase transitions in superfluid helium-3 Open
The symmetry-breaking first-order phase transition between superfluid phases 3 He-A and 3 He-B can be triggered extrinsically by ionising radiation or heterogeneous nucleation arising from the details of the sample cell construction. Howev…
View article: A-B transition in superfluid $^3$He and cosmological phase transitions
A-B transition in superfluid $^3$He and cosmological phase transitions Open
First order phase transitions in the very early universe are a prediction of many extensions of the Standard Model of particle physics and could provide the departure from equilibrium needed for a dynamical explanation of the baryon asymme…
View article: Nanofluidic platform for studying the first-order phase transitions in superfluid helium-3
Nanofluidic platform for studying the first-order phase transitions in superfluid helium-3 Open
The symmetry-breaking first-order phase transition between superfluid phases $^3$He-A and $^3$He-B can be triggered extrinsically by ionising radiation or heterogeneous nucleation arising from the details of the sample cell construction. H…
View article: Shallow relic gravitational wave spectrum with acoustic peak
Shallow relic gravitational wave spectrum with acoustic peak Open
We study the gravitational wave (GW) spectrum produced by acoustic waves in the early universe, such as would be produced by a first order phase transition, focusing on the low-frequency side of the peak. We confirm with numerical simulati…
View article: Shallow relic gravitational wave spectrum with acoustic peak
Shallow relic gravitational wave spectrum with acoustic peak Open
We study the gravitational wave (GW) spectrum produced by acoustic waves in the early universe, such as would be produced by a first order phase transition, focusing on the low-frequency side of the peak. We confirm with numerical simulati…
View article: General relativistic bubble growth in cosmological phase transitions
General relativistic bubble growth in cosmological phase transitions Open
We use a full general relativistic framework to study the self-similar expansion of bubbles of the stable phase into a flat Friedmann-Lemaître-Robertson-Walker Universe in a first order phase transition in the early Universe. With a simple…
View article: Reconstructing physical parameters from template gravitational wave spectra at LISA: first order phase transitions
Reconstructing physical parameters from template gravitational wave spectra at LISA: first order phase transitions Open
A gravitational wave background from a first order phase transition in the early universe may be observable at millihertz gravitational wave (GW) detectors such as the Laser Interferometer Space Antenna (LISA). In this paper we introduce a…
View article: Multi-messenger constraints on Abelian-Higgs cosmic string networks
Multi-messenger constraints on Abelian-Higgs cosmic string networks Open
Nielsen-Olesen vortices in the Abelian-Higgs (AH) model are the simplest realisations of cosmic strings in a gauge field theory. Large-scale numerical solutions show that the dominant decay channel of a network of AH strings produced from …
View article: Reconstructing physical parameters from template gravitational wave spectra at LISA: first order phase transitions
Reconstructing physical parameters from template gravitational wave spectra at LISA: first order phase transitions Open
A gravitational wave background from a first order phase transition in the early universe may be observable at millihertz gravitational wave (GW) detectors such as the Laser Interferometer Space Antenna (LISA). In this paper we introduce a…
View article: Prospects for LISA to detect a gravitational-wave background from first order phase transitions
Prospects for LISA to detect a gravitational-wave background from first order phase transitions Open
First order phase transitions in the early universe could produce a gravitational-wave background that might be detectable by the Laser Interferometer Space Antenna (LISA). Such an observation would provide evidence for physics beyond the …
View article: Decay of acoustic turbulence in two dimensions and implications for cosmological gravitational waves
Decay of acoustic turbulence in two dimensions and implications for cosmological gravitational waves Open
Gravitational waves from a phase transition associated with the generation of the masses of elementary particles are within the reach of future space-based detectors such as LISA. A key determinant of the resulting power spectrum, not prev…
View article: Generation of gravitational waves from freely decaying turbulence
Generation of gravitational waves from freely decaying turbulence Open
We study the stochastic gravitational wave background (SGWB) produced by freely decaying vortical turbulence in the early Universe. We thoroughly investigate the time correlation of the velocity field, and hence of the anisotropic stresses…
View article: Supercooling of the A phase of 3He}
Supercooling of the A phase of 3He} Open
Because of the extreme purity, lack of disorder, and complex order parameter, the first-order superfluid 3He A-B transition is the leading model system for first order transitions in the early universe. Here we report on the path dependenc…
View article: Thermal suppression of bubble nucleation at first-order phase transitions in the early Universe
Thermal suppression of bubble nucleation at first-order phase transitions in the early Universe Open
One of the key observables in a gravitational wave power spectrum from a first order phase transition in the early Universe is the mean bubble spacing, which depends on the rate of nucleation of bubbles of the stable phase, as well as the …