Dr Sebastian Von Hausegger: Publications

A challenge to the standard cosmological model

Astrophysical Journal Letters (2022)

Authors:

Nathan Secrest, Sebastian VON HAUSEGGER, Mohamed Rameez, Roya Mohayaee, Subir Sarkar

Accurate Baryon Acoustic Oscillations Reconstruction via Semidiscrete Optimal Transport

Physical Review Letters American Physical Society (APS) 128:20 (2022) 201302

Authors:

Sebastian von Hausegger, Bruno Lévy, Roya Mohayaee

Accurate Baryon Acoustic Oscillations reconstruction via semi-discrete optimal transport

(2021)

Authors:

Sebastian VON HAUSEGGER, Bruno Lévy, Roya Mohayaee

A fast semidiscrete optimal transport algorithm for a unique reconstruction of the early Universe

Monthly Notices of the Royal Astronomical Society 91̽�� University Press (OUP) 506:1 (2021) 1165-1185

Authors:

Bruno Levy, Roya Mohayaee, Sebastian von Hausegger

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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