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Theoretical physicists working at a blackboard collaboration pod in the Beecroft building.
Credit: Jack Hobhouse

Dr Sebastian Von Hausegger

Postdoctoral Research Assistant

Research theme

  • Astronomy and astrophysics
  • Biological physics
  • Particle astrophysics & cosmology

Sub department

  • Rudolf Peierls Centre for Theoretical Physics

Research groups

  • Beecroft Institute for Particle Astrophysics and Cosmology
  • Oxford Molecular Motors
  • Cosmology
  • Rubin-LSST
  • The Square Kilometre Array (SKA)
sebastian.vonhausegger@physics.ox.ac.uk
Telephone: 01865210826
Rudolf Peierls Centre for Theoretical Physics, room 50.25
  • About
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  • Publications

Accurate Baryon Acoustic Oscillations Reconstruction via Semidiscrete Optimal Transport.

Physical review letters 128:20 (2022) 201302

Authors:

Sebastian von Hausegger, Bruno Lévy, Roya Mohayaee

Abstract:

Optimal transport theory has recently re-emerged as a vastly resourceful field of mathematics with elegant applications across physics and computer science. Harnessing methods from geometry processing, we report on the efficient implementation for a specific problem in cosmology-the reconstruction of the linear density field from low redshifts, in particular the recovery of the baryonic acoustic oscillation (BAO) scale. We demonstrate our algorithm's accuracy by retrieving the BAO scale in noiseless cosmological simulations that are dedicated to cancel cosmic variance; we find uncertainties to be reduced by a factor of 4.3 compared with performing no reconstruction, and a factor of 3.1 compared with standard reconstruction.
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A fast semidiscrete optimal transport algorithm for a unique reconstruction of the early Universe

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 506:1 (2021) 1165-1185

Authors:

Bruno Levy, Roya Mohayaee, Sebastian von Hausegger
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A test of the cosmological principle with quasars

Astrophysical Journal Letters IOP Publishing 908:2 (2021) L51

Authors:

Nathan Secrest, Sebastian Von Hausegger, Mohamed Rameez, Roya Mohayaee, Subir Sarkar, Jacques Colin

Abstract:

We study the large-scale anisotropy of the universe by measuring the dipole in the angular distribution of a flux-limited, all-sky sample of 1.36 million quasars observed by the Wide-field Infrared Survey Explorer (WISE). This sample is derived from the new CatWISE2020 catalog, which contains deep photometric measurements at 3.4 and 4.6 μm from the cryogenic, post-cryogenic, and reactivation phases of the WISE mission. While the direction of the dipole in the quasar sky is similar to that of the cosmic microwave background (CMB), its amplitude is over twice as large as expected, rejecting the canonical, exclusively kinematic interpretation of the CMB dipole with a p-value of 5 × 10−7 (4.9σ for a normal distribution, one-sided), the highest significance achieved to date in such studies. Our results are in conflict with the cosmological principle, a foundational assumption of the concordance ΛCDM model.
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The kinematic contribution to the cosmic number count dipole

Astronomy & Astrophysics EDP Sciences 697 (2025) a112

Authors:

JD Wagenveld, S von Hausegger, H-R Klöckner, DJ Schwarz
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The kinematic contribution to the cosmic number count dipole

ArXiv 2503.0247 (2025)

Authors:

JD Wagenveld, S von Hausegger, H-R Klöckner, DJ Schwarz
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