Search Results for author:
Found 27 papers, 19 papers with code
A comparison of optimisation algorithms for high-dimensional particle and astrophysics applications
Optimisation problems are ubiquitous in particle and astrophysics, and involve locating the optimum of a complicated function of many parameters that may be computationally expensive to evaluate.
Bayesian Optimisation
High Energy Physics - Phenomenology
Computational Physics
Redshift-Space Distortions in Lagrangian Perturbation Theory
We present the one-loop 2-point function of biased tracers in redshift space computed with Lagrangian perturbation theory, including a full resummation of both long-wavelength (infrared) displacements and velocities.
Cosmology and Nongalactic Astrophysics
Cross-Correlation of Planck CMB Lensing with DESI-Like LRGs
Cross-correlations between the lensing of the cosmic microwave background (CMB) and other tracers of large-scale structure provide a unique way to reconstruct the growth of dark matter, break degeneracies between cosmology and galaxy physics, and test theories of modified gravity.
Cosmology and Nongalactic Astrophysics
CosmoBit: A GAMBIT module for computing cosmological observables and likelihoods
We introduce $\sf{CosmoBit}$, a module within the open-source $\sf{GAMBIT}$ software framework for exploring connections between cosmology and particle physics with joint global fits.
Cosmology and Nongalactic Astrophysics High Energy Physics - Phenomenology
Strengthening the bound on the mass of the lightest neutrino with terrestrial and cosmological experiments
We determine the upper limit on the mass of the lightest neutrino from the most robust recent cosmological and terrestrial data.
Cosmology and Nongalactic Astrophysics High Energy Physics - Phenomenology
Searching for dark energy in the matter-dominated era
Many theoretical models involving dynamical dark energy exhibit a 'freezing' equation of state however, where $w \to -1$ at late times, with a transition to a 'tracking' behaviour at earlier times (with $w \gg -1$ at sufficiently high redshift).
Cosmology and Nongalactic Astrophysics
Consistent Modeling of Velocity Statistics and Redshift-Space Distortions in One-Loop Perturbation Theory
The peculiar velocities of biased tracers of the cosmic density field contain important information about the growth of large scale structure and generate anisotropy in the observed clustering of galaxies.
Cosmology and Nongalactic Astrophysics
Reconstructing large-scale structure with neutral hydrogen surveys
For redshifts $z=2$ and 4, we are able to reconstruct 21cm field with cross correlation, $r_c > 0. 8$ on all scales for both our optimistic and pessimistic assumptions about foreground contamination and for different levels of thermal noise.
Cosmology and Nongalactic Astrophysics
Intensity mapping with neutral hydrogen and the Hidden Valley simulations
This paper introduces the Hidden Valley simulations, a set of trillion-particle N-body simulations in gigaparsec volumes aimed at intensity mapping science.
Cosmology and Nongalactic Astrophysics
Learning How to Mutate Source Code from Bug-Fixes
Starting from code fixed by developers in the context of a bug-fix, our empirical evaluation showed that our models are able to predict mutants that resemble original fixed bugs in between 9% and 45% of the cases (depending on the model).
Software Engineering
Inflation and Early Dark Energy with a Stage II Hydrogen Intensity Mapping Experiment
This white paper envisions a revolutionary post-DESI, post-LSST dark energy program based on intensity mapping of the redshifted 21cm emission line from neutral hydrogen at radio frequencies.
Cosmology and Nongalactic Astrophysics Instrumentation and Methods for Astrophysics High Energy Physics - Experiment
Global analyses of Higgs portal singlet dark matter models using GAMBIT
In all Higgs portal models, we find parameter regions that can explain all of dark matter and give a good fit to all data.
High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics
Sorting and Transforming Program Repair Ingredients via Deep Learning Code Similarities
We aim to reason about the repair ingredients by using code similarities to prioritize and transform statements in a codebase for patch generation.
Software Engineering
Modeling CMB Lensing Cross Correlations with {\sc CLEFT}
A new generation of surveys will soon map large fractions of sky to ever greater depths and their science goals can be enhanced by exploiting cross correlations between them.
Cosmology and Nongalactic Astrophysics
Effect of electromagnetic dipole dark matter on energy transport in the solar interior
We show that dark matter with an anapole moment of $\sim1\mathrm{GeV}^{-2}$ or magnetic dipole moment of $\sim10^{-3}\mu_p$ can improve the sound-speed profile, small frequency separations and convective zone radius with respect to the Standard Solar Model.
High Energy Physics - Phenomenology Solar and Stellar Astrophysics
The Gaussian streaming model and Lagrangian effective field theory
We compare the ingredients of the GSM to a suite of large N-body simulations, and show the performance of the theory on the low order multipoles of the redshift-space correlation function and power spectrum.
Cosmology and Nongalactic Astrophysics
The clustering of galaxies in the completed SDSS-III Baryon Oscillation Spectroscopic Survey: cosmological analysis of the DR12 galaxy sample
When combined with supernova Ia data, we find H0 = 67. 3+/-1. 0 km/s/Mpc even for our most general dark energy model, in tension with some direct measurements.
Cosmology and Nongalactic Astrophysics
SDSS-III Baryon Oscillation Spectroscopic Survey Data Release 12: galaxy target selection and large scale structure catalogues
We also present the algorithms used to create large scale structure catalogues for the final Data Release (DR12) samples and the associated random catalogues that quantify the survey mask.
Cosmology and Nongalactic Astrophysics Astrophysics of Galaxies
A Lagrangian effective field theory
We find that all of our models fare well on scales larger than about two to three times the non-linear scale, but fail as the non-linear scale is approached.
Cosmology and Nongalactic Astrophysics
Reconstruction within the Zeldovich approximation
The Zeldovich approximation, 1st order Lagrangian perturbation theory, provides a good description of the clustering of matter and galaxies on large scales.
Cosmology and Nongalactic Astrophysics
Mock galaxy catalogs using the quick particle mesh method
Sophisticated analysis of modern large-scale structure surveys requires mock catalogs.
Cosmology and Nongalactic Astrophysics
An analytic model for redshift-space distortions
We combine the CLPT predictions of real-space clustering and velocity statistics in the Gaussian streaming model of Reid & White (2011) to obtain predictions for the monopole and quadrupole correlation functions accurate to 2 and 4 per cent respectively down to <25Mpc/h for halos hosting the massive galaxies observed by SDSS-III BOSS.
Cosmology and Nongalactic Astrophysics
Convolution Lagrangian perturbation theory for biased tracers
Our formalism naturally includes non-linear bias and explains the strong bias-dependence of the multipole moments of the redshift-space correlation function seen in N-body simulations.
Cosmology and Nongalactic Astrophysics
Towards an accurate model of the redshift space clustering of halos in the quasilinear regime
We model the first non-perturbatively using the scale-dependent Gaussian streaming model, which we show is accurate at the <0. 5 (2) per cent level in transforming real space clustering and velocity statistics into redshift space on scales s>10 (s>25) Mpc/h for the monopole (quadrupole) halo correlation functions.
Cosmology and Nongalactic Astrophysics
Embedding realistic surveys in simulations through volume remapping
Connecting cosmological simulations to real-world observational programs is often complicated by a mismatch in geometry: while surveys often cover highly irregular cosmological volumes, simulations are customarily performed in a periodic cube.
Cosmology and Nongalactic Astrophysics
On the Robustness of the Acoustic Scale in the Low-Redshift Clustering of Matter
We discuss the effects of non-linear structure formation on the signature of acoustic oscillations in the late-time galaxy distribution.
A Complete Treatment of CMB Anisotropies in a FRW Universe
We generalize the total angular momentum method for computing Cosmic Microwave Background anisotropies to Friedman-Robertson-Walker (FRW) spaces with arbitrary geometries.
astro-ph
