Imperial College London
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ProfessorAlanHeavens

Faculty of Natural Sciences, Department of Physics

Chair in Astrostatistics
 
 
 
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Contact

 

+44 (0)20 7594 2930a.heavens Website

 
 
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Location

 

1018EBlackett LaboratorySouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Prideaux-Ghee:2023:mnras/stac3346,
author = {Prideaux-Ghee, J and Leclercq, F and Lavaux, G and Heavens, A and Jasche, J},
doi = {mnras/stac3346},
journal = {Monthly Notices of the Royal Astronomical Society},
pages = {4191--4213},
title = {Field-based physical inference from peculiar velocity tracers},
url = {http://dx.doi.org/10.1093/mnras/stac3346},
volume = {518},
year = {2023}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - We present a Bayesian hierarchical modelling approach to reconstruct theinitial cosmic matter density field constrained by peculiar velocityobservations. As our approach features a model for the gravitational evolutionof dark matter to connect the initial conditions to late-time observations, itreconstructs the final density and velocity fields as natural byproducts. Weimplement this field-based physical inference approach by adapting the BayesianOrigin Reconstruction from Galaxies (BORG) algorithm, which explores thehigh-dimensional posterior through the use of Hamiltonian Monte Carlo sampling.We test the self-consistency of the method using random sets of mock tracers,and assess its accuracy in a more complex scenario where peculiar velocitytracers are non-linearly evolved mock haloes. We find that our frameworkself-consistently infers the initial conditions, density and velocity fields,and shows some robustness to model mis-specification. As compared to thestate-of-the-art approach of constrained Gaussian random fields/Wienerfiltering, our method produces more accurate final density and velocity fieldreconstructions. It also allows us to constrain the initial conditions bypeculiar velocity observations, complementing in this aspect previousfield-based approaches based on other cosmological observables.
AU  - Prideaux-Ghee,J
AU  - Leclercq,F
AU  - Lavaux,G
AU  - Heavens,A
AU  - Jasche,J
DO  - mnras/stac3346
EP  - 4213
PY  - 2023///
SN  - 0035-8711
SP  - 4191
TI  - Field-based physical inference from peculiar velocity tracers
T2  - Monthly Notices of the Royal Astronomical Society
UR  - http://dx.doi.org/10.1093/mnras/stac3346
UR  - http://arxiv.org/abs/2204.00023v3
UR  - http://hdl.handle.net/10044/1/101714
VL  - 518
ER  -
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