skip to primary navigationskip to content
 

Dr Will Handley

Dr Will Handley

Research Fellow at Gonville & Caius College

Cosmology

Cosmic Microwave Background

Bayesian Statistics

Nested Sampling

Will Handley is available for consultancy.


Office Phone: (01223) 766660

Biography:


2016 Oct-Present: Junior Research Fellow at Gonville & Caius College

2016 July-Sep: Postdoctoral position at UCL

2012-2016: PhD in Physics (University of Cambridge)

2008-2012: MSci in Experimental and Theoretical Physics (University of Cambridge)

CV

Research Interests

Will Handley is a Theoretical Cosmologist, studying the very earliest moments of the universe. He completed his PhD in 2016 under his supervisors Anthony Lasenby and Mike Hobson.

His main interest is in "Initial Conditions for Inflation", examining the effect that high energy physics has on the universe a split second after the Big Bang. In 2014, he proved that that the pre-inflationary universe takes an extremely generic form, independent of the type of particle which drives the early accelerated expansion of the universe.

In addition to theoretical investigation, he also examines the observational consequences of these new ideas; testing theories against the latest data from microwave telescopes using the University supercomputers.

Recently, his work has focussed on developing novel Bayesian algorithms for high-dimensional parameter estimation and model comparison using nested sampling. Possible applications currently under investigation include protein folding and compressed sensing, in addition to cosmological parameter estimation and model comparison.

Will Handley is a member of the Planck Core HFI team 2.

Research Supervision

PhD Students: Lukas Hergt, Fruzsina Agocs, Will Barker

Postdoctoral researchers: Kamran Javid

Teaching

  • Supervisions: Part IA Mathematics for Natural Sciences (Michaelmas 2012-present)
  • Supervisions: Part IA Physics for Natural Sciences (Michaelmas 2015 - Easter 2016)
  • Supervisions: Part II General Relativity (Michaelmas 2013-present)
  • Demonstrating: Part II Theoretical Physics 1 (Michaelmas 2012)
  • Demonstrating: Part II Theoretical Physics 2 (Lent 2013)
  • Tripos Examples Classes: Part IA Mathematics for Natural Sciences (Easter 2014 -Present)

Part III Projects

Galileo

Other Professional Activities

Awards and Prizes

  • December 2013: Best Presentation (Cavendish Graduate Students Conference)
  • 2011-2012: Best Theoretical final year project (University of Cambridge)
  • 2018: Gruber Prize (co-shared with Planck)

Talks

  • Bayesian Statistics, Third Asterics-Obelics workshop, Cambridge, UK (Oct 2018)
  • Planck, inflation and the future of inflationary constraints, Consistency of Cosmological Datasets, Cambridge, UK (May 2018)
  • MaxEnt priors with derived parameters in a specified distribution, Cambridge (May 2018)
  • Nested Sampling: an efficient and robust Bayesian inference tool for astrophysics and cosmology ICIC, London (May 2018)
  • Introduction to statistics, CosmoTools 18, RWTH Aachen, Germany (April 2018)
  • Advances in Nested Sampling and astrophysical application, Cambridge, UK (Jan 2018)
  • PolyChord 2.0: Fast cosmological inference with Nested Sampling, Cosmo 17 Paris (Aug 2017)
  • Modern Bayesian Inference: Theory and Practice, RWTH Aachen (Jun 2017)
  • Parameter estimation and Model comparison, IFT Summer School, Madrid (Mar 2017)
  • PolyChord 2.0: Advances in Nested Sampling with astrophysical applications, CCA, Flatiron institute, New York (Feb 2017)
  • PolyChord 2.0 & the future of nested sampling, University College London, UK. (Sep 2016)
  • PolyChord 2.0 & the future of nested sampling, University of Sussex, UK. (May 2016)
  • PolyChord & the future of nested sampling, Edinburgh, UK. (Mar 2016)
  • PolyChord: next generation nested sampling, Max Planck Institute, Germany. (Dec 2015)
  • PolyChord: next generation nested sampling, University of Sussex, UK. (Feb 2015)
  • Kinetic dominance in the pre-inflationary universe, Cavendish grad. conference (Dec 2013)

Outreach

Keywords

Machine Learning ; Bayesian Statistics ; Inflation ; Cosmology

Topics

  • Relativity and Gravitation

Other Publications

W.J. Handley's articles on arXiv

[1]  http://arxiv.org/abs/1704.03459v4 [htmlpdf]
Dynamic nested sampling: an improved algorithm for parameter estimation and evidence calculation
Edward Higson, Will Handley, Mike Hobson, Anthony Lasenby
Comments: 14 pages + appendix, 16 figures. Added signal reconstruction numerical example using dyPolyChord. Moderate updates to text and appendices
Subjects: Computation (stat.CO); Computation (stat.CO),Instrumentation and Methods for Astrophysics (astro-ph.IM),Data Analysis, Statistics and Probability (physics.data-an),Methodology (stat.ME)
[2]  http://arxiv.org/abs/1804.06406v3 [htmlpdf]
nestcheck: diagnostic tests for nested sampling calculations
Edward Higson, Will Handley, Mike Hobson, Anthony Lasenby
Comments: Minor updates and improvements to text. Added extra figure. 12 pages + appendix, 15 figures
Subjects: Computation (stat.CO); Computation (stat.CO),Cosmology and Nongalactic Astrophysics (astro-ph.CO),Instrumentation and Methods for Astrophysics (astro-ph.IM),Data Analysis, Statistics and Probability (physics.data-an)
[3]  http://arxiv.org/abs/1809.11095v1 [htmlpdf]
Rapid numerical solutions for the Mukhanov-Sazaki equation
W. I. J. Haddadin, W. J. Handley
Comments: 7 pages, 6 figures, Submitted to Physical Review D
Subjects: Cosmology and Nongalactic Astrophysics (astro-ph.CO); Cosmology and Nongalactic Astrophysics (astro-ph.CO),General Relativity and Quantum Cosmology (gr-qc),Computational Physics (physics.comp-ph)
[4]  http://arxiv.org/abs/1809.07737v1 [htmlpdf]
Constraining the kinetically dominated Universe
L. T. Hergt, W. J. Handley, M. P. Hobson, A. N. Lasenby
Comments: Submitted to Physical Review D, 15 pages, 12 figures, 1 table
Subjects: Cosmology and Nongalactic Astrophysics (astro-ph.CO); Cosmology and Nongalactic Astrophysics (astro-ph.CO),General Relativity and Quantum Cosmology (gr-qc)
[5]  http://arxiv.org/abs/1809.07185v1 [htmlpdf]
A case for kinetically dominated initial conditions for inflation
L. T. Hergt, W. J. Handley, M. P. Hobson, A. N. Lasenby
Comments: Submitted to PRL, 6 pages, 4 figures
Subjects: Cosmology and Nongalactic Astrophysics (astro-ph.CO); Cosmology and Nongalactic Astrophysics (astro-ph.CO),General Relativity and Quantum Cosmology (gr-qc)
[6]  http://arxiv.org/abs/1401.2253v3 [htmlpdf]
Kinetic Initial Conditions for Inflation
W. J. Handley, S. D. Brechet, A. N. Lasenby, M. P. Hobson
Comments: Accepted by Physical Review D, 20 pages, 14 figures. v3 contains a significant correction to the proof, submitted as an errata to PRD
Subjects: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
Journal ref: Phys. Rev. D 89 (2014) 063505
[7]  http://arxiv.org/abs/1809.04598v1 [htmlpdf]
Bayesian sparse reconstruction: a brute-force approach to astronomical imaging and machine learning
Edward Higson, Will Handley, Michael Hobson, Anthony Lasenby
Comments: 16 pages + appendix, 19 figures
Subjects: Instrumentation and Methods for Astrophysics (astro-ph.IM); Instrumentation and Methods for Astrophysics (astro-ph.IM),Methodology (stat.ME),Machine Learning (stat.ML)
[8]  http://arxiv.org/abs/1802.08649v2 [htmlpdf]
Planck intermediate results. LIV. The Planck Multi-frequency Catalogue of Non-thermal Sources
Planck Collaboration, 
Comments: 24 pages, 15 figures. Accepted for publication in Astronomy & Astrophysics
Subjects: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
[9]  http://arxiv.org/abs/1807.06206v2 [htmlpdf]
Planck 2018 results. II. Low Frequency Instrument data processing
Planck Collaboration,
Subjects: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
[10]  http://arxiv.org/abs/1707.00132v3 [htmlpdf]
Planck intermediate results. LIII. Detection of velocity dispersion from the kinetic Sunyaev-Zeldovich effect
Planck Collaboration,
Comments: 20 pages, 12 figures and 8 tables, A&A in press
Subjects: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
Journal ref: A&A 617, A48 (2018)
[11]  http://arxiv.org/abs/1801.04945v2 [htmlpdf]
Planck 2018 results. XI. Polarized dust foregrounds
Planck Collaboration, 
Comments: Revised version presented as part of the Planck 2018 Legacy series. Submitted to A&A
Subjects: Astrophysics of Galaxies (astro-ph.GA); Astrophysics of Galaxies (astro-ph.GA),Cosmology and Nongalactic Astrophysics (astro-ph.CO),Instrumentation and Methods for Astrophysics (astro-ph.IM)
[12]  http://arxiv.org/abs/1807.06212v1 [htmlpdf]
Planck 2018 results. XII. Galactic astrophysics using polarized dust emission
Planck Collaboration, 
Subjects: Astrophysics of Galaxies (astro-ph.GA)
[13]  http://arxiv.org/abs/1807.06211v1 [htmlpdf]
Planck 2018 results. X. Constraints on inflation
Planck Collaboration, 
Subjects: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
[14]  http://arxiv.org/abs/1807.06210v1 [htmlpdf]
Planck 2018 results. VIII. Gravitational lensing
Planck Collaboration,
Comments: Submitted to A&A. Abstract abridged for arxiv submission. Lensing data products available at https://wiki.cosmos.esa.int/planck-legacy-archive/index.php/Lensing
Subjects: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
[15]  http://arxiv.org/abs/1807.06209v1 [htmlpdf]
Planck 2018 results. VI. Cosmological parameters
Planck Collaboration, 
Comments: 71 pages. Parameter tables and chains available at https://wiki.cosmos.esa.int/planck-legacy-archive/index.php/Cosmological_Parameters
Subjects: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
[16]  http://arxiv.org/abs/1807.06208v1 [htmlpdf]
Planck 2018 results. IV. Diffuse component separation
Planck Collaboration,
Comments: 74 pages, submitted to A&A
Subjects: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
[17]  http://arxiv.org/abs/1807.06207v1 [htmlpdf]
Planck 2018 results. III. High Frequency Instrument data processing and frequency maps
Planck Collaboration,
Comments: Accepted for publication on A&A (AA/2018/32909)
Subjects: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
[18]  http://arxiv.org/abs/1807.06205v1 [htmlpdf]
Planck 2018 results. I. Overview and the cosmological legacy of Planck
Planck Collaboration,
Comments: 61 pages, 40 figures
Subjects: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
[19]  http://arxiv.org/abs/1806.00518v2 [htmlpdf]
On the Feasibility of Intense Radial Velocity Surveys for Earth-twin Discoveries
Richard D. Hall, Samantha J. Thompson, Will Handley, Didier Queloz
Comments: 22 pages, 13 figures
Subjects: Earth and Planetary Astrophysics (astro-ph.EP)
[20]  http://arxiv.org/abs/1803.10210v2 [htmlpdf]
Towards a framework for testing general relativity with extreme-mass-ratio-inspiral observations
Alvin J. K. Chua, Sonke Hee, Will J. Handley, Edward Higson, Christopher J. Moore, Jonathan R. Gair, Michael P. Hobson, Anthony N. Lasenby
Comments: Published version
Subjects: General Relativity and Quantum Cosmology (gr-qc); General Relativity and Quantum Cosmology (gr-qc),High Energy Astrophysical Phenomena (astro-ph.HE),Instrumentation and Methods for Astrophysics (astro-ph.IM)
Journal ref: Mon. Notices Royal Astron. Soc. 478, 28 (2018)
[21]  http://arxiv.org/abs/1804.08143v2 [htmlpdf]
Maximum entropy priors with derived parameters in a specified distribution
Will Handley, Marius Millea
Comments: 7 pages, 2 figures, Submitted to Bayesian Analysis
Subjects: Statistics Theory (math.ST); Statistics Theory (math.ST),Cosmology and Nongalactic Astrophysics (astro-ph.CO),Instrumentation and Methods for Astrophysics (astro-ph.IM),High Energy Physics - Phenomenology (hep-ph),Statistics Theory (math.ST)
[22]  http://arxiv.org/abs/1703.09701v2 [htmlpdf]
Sampling Errors in Nested Sampling Parameter Estimation
Edward Higson, Will Handley, Mike Hobson, Anthony Lasenby
Comments: Very minor changes. 22 pages + appendix, 10 figures. Accepted by Bayesian Analysis
Subjects: Methodology (stat.ME); Methodology (stat.ME),Instrumentation and Methods for Astrophysics (astro-ph.IM),Applications (stat.AP)
Journal ref: Bayesian Analysis (2017)
[23]  http://arxiv.org/abs/1502.02114v2 [htmlpdf]
Planck 2015 results. XX. Constraints on inflation
Planck Collaboration, 
Comments: 68 pages, 59 figures, 18 tables; updates to match the published version
Subjects: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
[24]  http://arxiv.org/abs/1704.05764v3 [htmlpdf]
Exploring cosmic origins with CORE: effects of observer peculiar motion
CORE Collaboration
Comments: 61+5 pages, 17 figures, 25 tables, 8 sections, 5 appendices. In press on JCAP - Version 3 - Minor changes, affiliations fixed, references updated - version in line with corrected proofs
Subjects: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
[25]  http://arxiv.org/abs/1707.04224v1 [htmlpdf]
Exploring cosmic origins with CORE: mitigation of systematic effects
CORE collaboration
Comments: 54 pages, 26 figures, 3 tables
Subjects: Cosmology and Nongalactic Astrophysics (astro-ph.CO); Cosmology and Nongalactic Astrophysics (astro-ph.CO),Instrumentation and Methods for Astrophysics (astro-ph.IM)
[26]  http://arxiv.org/abs/1701.08165v2 [htmlpdf]
Dynamical dark energy in light of the latest observations
Gong-Bo Zhao, Marco Raveri, Levon Pogosian, Yuting Wang, Robert G. Crittenden, Will J. Handley, Will J. Percival, Florian Beutler, Jonathan Brinkmann, Chia-Hsun Chuang, Antonio J. Cuesta, Daniel J. Eisenstein, Francisco-Shu Kitaura, Kazuya Koyama, Benjamin L'Huillier, Robert C. Nichol, Matthew M. Pieri, Sergio Rodriguez-Torres, Ashley J. Ross, Graziano Rossi, Ariel G. Sánchez, Arman Shafieloo, Jeremy L. Tinker, Rita Tojeiro, Jose A. Vazquez, Hanyu Zhang
Comments: 27 pages, 3 figures and one table. A supplementary document is included. The BOSS DR12 BAO data used in the work can be downloaded from the SDSS website https://sdss3.org//science/boss_publications.php (check https://data.sdss.org/sas/dr12/boss/papers/clustering/Zhao_etal_2016_DR12COMBINED_tomoBAO_powspec.tar.gz for the tomographic BAO measurement presented in https://arxiv.org/abs/1607.03153)
Subjects: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
Journal ref: Nature Astronomy, 1, 627-632, (2017)
[27]  http://arxiv.org/abs/1707.02259v1 [htmlpdf]
Exploring cosmic origins with CORE: gravitational lensing of the CMB
CORE Collaboration
Comments: 44 pages, 12 figures
Subjects: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
[28]  http://arxiv.org/abs/1704.04501v2 [htmlpdf]
Exploring Cosmic Origins with CORE: B-mode Component Separation
CORE collaboration
Comments: 87 pages, 32 figures, 4 tables, expanded abstract. Updated to match version accepted by JCAP
Subjects: Cosmology and Nongalactic Astrophysics (astro-ph.CO); Cosmology and Nongalactic Astrophysics (astro-ph.CO),Astrophysics of Galaxies (astro-ph.GA),Instrumentation and Methods for Astrophysics (astro-ph.IM)
[29]  http://arxiv.org/abs/1706.04516v1 [htmlpdf]
Exploring Cosmic Origins with CORE: Survey requirements and mission design
CORE collaboration
Comments: 79 pages, 14 figures
Subjects: Instrumentation and Methods for Astrophysics (astro-ph.IM); Instrumentation and Methods for Astrophysics (astro-ph.IM),Cosmology and Nongalactic Astrophysics (astro-ph.CO)
[30]  http://arxiv.org/abs/1705.02170v2 [htmlpdf]
Exploring Cosmic Origins with CORE: The Instrument
CORE collaboration
Comments: 43 pages
Subjects: Instrumentation and Methods for Astrophysics (astro-ph.IM); Instrumentation and Methods for Astrophysics (astro-ph.IM),Cosmology and Nongalactic Astrophysics (astro-ph.CO),Instrumentation and Detectors (physics.ins-det)
[31]  http://arxiv.org/abs/1609.07263v4 [htmlpdf]
Exploring Cosmic Origins with CORE: Extragalactic sources in Cosmic Microwave Background maps
CORE collaboration
Comments: 40 pages, 9 figures, text expanded, co-authors added, to be submitted to JCAP
Subjects: Astrophysics of Galaxies (astro-ph.GA); Astrophysics of Galaxies (astro-ph.GA),Cosmology and Nongalactic Astrophysics (astro-ph.CO)
[32]  http://arxiv.org/abs/1612.00021v2 [htmlpdf]
Exploring Cosmic Origins with CORE: Cosmological Parameters
CORE collaboration
Comments: 90 pages, 25 Figures. Revised version with new authors list and references
Subjects: Cosmology and Nongalactic Astrophysics (astro-ph.CO); Cosmology and Nongalactic Astrophysics (astro-ph.CO),General Relativity and Quantum Cosmology (gr-qc),High Energy Physics - Phenomenology (hep-ph),High Energy Physics - Theory (hep-th)
[33]  http://arxiv.org/abs/1612.08270v2 [htmlpdf]
Exploring Cosmic Origins with CORE: Inflation
CORE Collaboration,
Comments: Latex 107 pages, revised with updated author list and minor modifications
Subjects: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
[34]  http://arxiv.org/abs/1703.10456v1 [htmlpdf]
Exploring Cosmic Origins with CORE: Cluster Science
CORE collaboration
Comments: 35 pages, 15 figures, to be submitted to JCAP
Subjects: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
[35]  http://arxiv.org/abs/1607.00270v2 [htmlpdf]
Constraining the dark energy equation of state using Bayes theorem and the Kullback-Leibler divergence
S. Hee, J. A. Vázquez, W. J. Handley, M. P. Hobson, A. N. Lasenby
Comments: 9 pages, 3 tables, 5 figures; published in MNRAS
Subjects: Cosmology and Nongalactic Astrophysics (astro-ph.CO); Cosmology and Nongalactic Astrophysics (astro-ph.CO),Instrumentation and Methods for Astrophysics (astro-ph.IM)
Journal ref: MNRAS (2016) 466 (1): 369-377
[36]  http://arxiv.org/abs/1506.09024v2 [htmlpdf]
Bayesian model selection without evidences: application to the dark energy equation-of-state
Sonke Hee, Will Handley, Mike P. Hobson, Anthony N. Lasenby
Comments: Published in MNRAS. Article is 13 pages long including 12 figures, 3 tables and 2 appendices
Subjects: Cosmology and Nongalactic Astrophysics (astro-ph.CO); Cosmology and Nongalactic Astrophysics (astro-ph.CO),Instrumentation and Methods for Astrophysics (astro-ph.IM)
Journal ref: MNRAS (2015) 455 (3): 2461-2473
[37]  http://arxiv.org/abs/1612.02288v2 [htmlpdf]
The Runge-Kutta-Wentzel-Kramers-Brillouin Method
W. J. Handley, A. N. Lasenby, M. P. Hobson
Comments: 8 pages, 5 figures, submitted to the Journal of Computational Physics
Subjects: Computational Physics (physics.comp-ph); Computational Physics (physics.comp-ph),Instrumentation and Methods for Astrophysics (astro-ph.IM)
[38]  http://arxiv.org/abs/1607.04148v2 [htmlpdf]
Novel quantum initial conditions for inflation
W. J. Handley, A. N. Lasenby, M. P. Hobson
Comments: 6 pages, 1 figure, Accepted by Physical Review D
Subjects: General Relativity and Quantum Cosmology (gr-qc); General Relativity and Quantum Cosmology (gr-qc),Cosmology and Nongalactic Astrophysics (astro-ph.CO)
[39]  http://arxiv.org/abs/1604.06120v1 [htmlpdf]
AMI observations of ten CLASH galaxy clusters: SZ and X-ray data used together to determine cluster dynamical states
Clare Rumsey, Malak Olamaie, Yvette C. Perrott, Helen R. Russell, Farhan Feroz, Keith J. B. Grainge, Will J. Handley, Michael P. Hobson, Richard D. E. Saunders, Michel P. Schammel
Comments: 22 pages, 15 figures, 7 tables
Subjects: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
[40]  http://arxiv.org/abs/1502.01582v2 [htmlpdf]
Planck 2015 results. I. Overview of products and scientific results
Planck Collaboration
Comments: 40 pages, 24 figures
Subjects: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
[41]  http://arxiv.org/abs/1506.00171v1 [htmlpdf]
PolyChord: next-generation nested sampling
W. J. Handley, M. P. Hobson, A. N. Lasenby
Comments: Submitted to MNRAS, 15 pages, 14 figures
Subjects: Instrumentation and Methods for Astrophysics (astro-ph.IM)
[42]  http://arxiv.org/abs/1502.01856v3 [htmlpdf]
PolyChord: nested sampling for cosmology
W. J. Handley, M. P. Hobson, A. N. Lasenby
Comments: Accepted by MNRAS 2015 March 20. Received 2015 March 20; in original form 2015 February 6, 5 pages, 5 figures
Subjects: Cosmology and Nongalactic Astrophysics (astro-ph.CO); Cosmology and Nongalactic Astrophysics (astro-ph.CO),Instrumentation and Methods for Astrophysics (astro-ph.IM)