CV

Research Interests

Cosmology; statistical and machine learning methodology in astrophysics and cosmology; Bayesian large-scale structure inference; field-level inference; symbolic regression; dark matter; dark energy; galaxy formation; astrophysical tests of fundamental physics; modified gravity; cosmological hydrodynamical simulations.

Employment

Postdoctoral Fellow, CNRS & Sorbonne Université, Institut d’Astrophysique de Paris, 2022-Present
Covid Response Officer, Oriel College, University of Oxford, 2021-2022
Graduate Teaching and Research Scholar, Oriel College, University of Oxford, 2020-2022

Education

DPhil in Astrophysics, Oriel College, University of Oxford 2019-2022
- Thesis: Fundamental Physics from Galaxies
- Supervisors: Prof. Pedro Ferreira and Dr. Harry Desmond
MA, MSci in Natural Sciences, Trinity College, University of Cambridge, 2015-2019
- Results: Class 1, 86.2%, Rank 3/92
- Thesis: The conformal boundary at the end of the universe
- Supervisor: Dr. Will Handley

Awards and Scholarships

Graduate Teaching and Research Scholar, Oriel College, Oxford 2020–2022
Senior Scholar, Trinity College, Cambridge 2016–19
Bronze Medal, 46th International Physics Olympiad, Mumbai 2015
Exceptional mathematical performance, British Physics Olympiad 2015

Publications

Spatially offset black holes in the Horizon-AGN simulation and comparison to observations

D.J. Bartlett, H. Desmond, J. Devriendt, P.G. Ferreira and A. Slyz. "Spatially offset black holes in the Horizon-AGN simulation and comparison to observations." MNRAS, 500(4):4639–4657.

Constraints on Galileons from the positions of supermassive black holes

D.J. Bartlett, H. Desmond and P.G. Ferreira (2021). "Constraints on Galileons from the positions of supermassive black holes" Phys. Rev. D, 103(2):023523.

Calibrating galaxy formation effects in galactic tests of fundamental physics

D.J. Bartlett, H. Desmond and P.G. Ferreira (2021). "Calibrating galaxy formation effects in galactic tests of fundamental physics." Phys. Rev. D, 103(12):123502.

Constraints on equivalence principle violation from gamma ray bursts

D.J. Bartlett, D. Bergsdal, H. Desmond, P.G. Ferreira and J. Jasche (2021). "Constraints on equivalence principle violation from gamma ray bursts." Phys. Rev. D, 104(8):084025.

Constraints on quantum gravity and the photon mass from gamma ray bursts

D.J. Bartlett, H. Desmond, P.G. Ferreira and J. Jasche (2021). "Constraints on quantum gravity and the photon mass from gamma ray bursts." Phys. Rev. D, 104(10):10351.

Perturbations and the future conformal boundary

A.N. Lasenby, W.J. Handley, D.J. Bartlett, and C.S. Negreanu (2022). "Perturbations and the future conformal boundary." Phys. Rev. D, 105(8):083514.

Improved cosmological fits with quantized primordial power spectra

D.J. Bartlett, W.J. Handley and A.N. Lasenby (2022). "Improved cosmological fits with quantized primordial power spectra." Phys. Rev. D, 105(8):083515.

The scatter in the galaxy–halo connection: a machine learning analysis

R. Stiskalek, D.J. Bartlett, H. Desmond, and D. Anbajagane (2022). "The scatter in the galaxy–halo connection: a machine learning analysis." MNRAS, 514(3):4026–4045.

Constraints on dark matter annihilation and decay from the large-scale structure of the nearby Universe

D.J. Bartlett, A. Kostic, H. Desmond, J. Jasche and G. Lavaux (2022). "Constraints on dark matter annihilation and decay from the large-scale structure of the nearby Universe." Phys. Rev. D, 106(10)110352.

On the functional form of the radial acceleration relation

H. Desmond, D.J. Bartlett and P.G. Ferreira (2023). "On the functional form of the radial acceleration relation." MNRAS 521(2):1817-1831.

No evidence for p- or d-wave dark matter annihilation from local large-scale structure

A. Kostic, D.J. Bartlett and H. Desmond (2023). "No evidence for p- or d-wave dark matter annihilation from local large-scale structure." arXiv:2304.10301.

Exhaustive Symbolic Regression

D.J. Bartlett, H. Desmond and P.G. Ferreira (2023). "Exhaustive Symbolic Regression." In IEEE Transactions on Evolutionary Computation 28, 950.

Modeling and testing screening mechanisms in the laboratory and in space

V. Vardanyan and D. J. Bartlett (2023). "Modeling and testing screening mechanisms in the laboratory and in space." Universe 2023, 9, 340.

Priors for symbolic regression

D.J. Bartlett, H. Desmond and P.G. Ferreira (2023). "Priors for symbolic regression." In Proceedings of the Companion Conference on Genetic and Evolutionary Computation, Association for Computing Machinery, New York, NY, USA, 2402–2411.

Constraints on dark matter and astrophysics from tomographic gamma-ray cross-correlations

A. Paopiamsap, D. Alonso, D.J. Bartlett and M. Bilicki (2023). "Constraints on dark matter and astrophysics from tomographic $\gamma$-ray cross-correlations." Phys. Rev. D 109, 103517.

Optimal inflationary potentials

Tomas Sousa, D.J. Bartlett, H. Desmond and P.G. Ferreira (2024). "Optimal inflationary potentials." Phys. Rev. D 109, 083524.

Marginalised Normal Regression: Unbiased curve fitting in the presence of x-errors

D.J. Bartlett and H. Desmond (2023). "Marginalised Normal Regression: Unbiased curve fitting in the presence of x-errors." The Open Journal of Astrophysics, 6, 11 2023..

ltu-ili: An All-in-One Framework for Implicit Inference in Astrophysics and Cosmology

M. Ho, D.J. Bartlett et al. (2024). "ltu-ili: An All-in-One Framework for Implicit Inference in Astrophysics and Cosmology." The Open Journal of Astrophysics, 7, 7 2024.

The Inefficiency of Genetic Programming for Symbolic Regression

G. Kronberger, Fabricio Olivetti de Franca, H. Desmond, D. J. Bartlett, and L. Kammerer (2024). "The Inefficiency of Genetic Programming for Symbolic Regression." arXiv:2404.17292.

Bye bye, local bias: the statistics of the halo field are not determined by the local mass density

D.J. Bartlett, M. Ho and B.D. Wandelt (2024). "Bye bye, local bias: the statistics of the halo field are not determined by the local mass density." arXiv:2405.00635.

syren-halofit: A fast, interpretable, high-precision formula for the LCDM nonlinear matter power spectrum

D.J. Bartlett, B.D. Wandelt, M. Zennaro, P.G. Ferreira and H. Desmond (2024). "syren-halofit: A fast, interpretable, high-precision formula for the $\Lambda$CDM nonlinear matter power spectrum." A&A 686:A150.

A precise symbolic emulator of the linear matter power spectrum

D.J. Bartlett, L. Kammerer, G. Kronberger, H. Desmond, P.G. Ferreira, B.D. Wandelt, B. Burlacu, D. Alonso and M. Zennaro (2023). "A precise symbolic emulator of the linear matter power spectrum." A&A 686:A209.

Statistical Patterns in the Equations of Physics and the Emergence of a Meta-Law of Nature

A. Constantin, D.J. Bartlett, H. Desmond and P.G. Ferreira (2024). "Statistical Patterns in the Equations of Physics and the Emergence of a Meta-Law of Nature." arXiv:2408.11065.

Scant evidence for thawing quintessence

W.J. Wolf, C. García-García, D.J. Bartlett and P.G. Ferreira (2024). "Scant evidence for thawing quintessence." Phys. Rev. D, 110(8):083528.

COmoving Computer Acceleration (COCA): N-body simulations in an emulated frame of reference

D.J. Bartlett, M. Chiarenza, L. Doeser and F. Leclercq (2024). "COmoving Computer Acceleration (COCA): N-body simulations in an emulated frame of reference." arXiv:2409.02154.

CHARM: Creating Halos with Auto-Regressive Multi-stage networks

S. Pandey, C. Modi, B.D. Wandelt, D.J. Bartlett, A.E. Bayer, G.L. Bryan, M. Ho, G. Lavaux, T.L. Makinen and F. Villaescusa-Navarro (2024). "CHARM: Creating Halos with Auto-Regressive Multi-stage networks." arXiv:2409.09124.

syren-new: Precise formulae for the linear and nonlinear matter power spectra with massive neutrinos and dynamical dark energy

C. Sui, D.J. Bartlett, S. Pandey, H. Desmond, P.G. Ferreira, P.G. Ferreira and B.D. Wandelt (2024). "syren-new: Precise formulae for the linear and nonlinear matter power spectra with massive neutrinos and dynamical dark energy." arXiv:2410.14623.

Teaching

Graduate Teaching and Research Scholar - Oriel College, University of Oxford (2020-2022)

Courses tutored:
- A3 Quantum Physics (2nd year Physics).
- B4 Nuclear and Particle Physics (3rd year Physics).
Ran tutorials, marked problem sheets, set and marked mock examinations.
Jointly ran mathematical interview for selection of undergraduate students in Physics and Physics and Philosophy. Wrote and delivered questions for these interviews and assessed candidates’ performance.

British Team Coach - British Physics Olympiad (2017-present)

Led sessions on a variety of topics. Planning content, writing questions and creating resources.
No student has failed to achieve a medal during the years I have been involved with the team.

Service

Collaborations

Referee for ApJ, IEEE, JCAP, PRL, Phys. Rev. D, The Open Journal of Astrophysics
Learning the Universe 2022-Present
Aquila Consortium 2021-Present

Deaglan Bartlett

CV