Sebastian von Hausegger

Sebastian von Hausegger

Associate Research Scientist
Physics

Research Interests

I am a cosmologist working at the interface of theory, data analysis and methodology, with expertise in cosmic microwave background physics and Galactic foregrounds, clustering and dynamics of large-scale structure, testing the foundations of the standard cosmological model, and the development of computational tools — notably from optimal transport theory — for cosmological problems. Two current highlights: the cosmic dipole anomaly, where the dipole in the distribution of distant sources exceeds the kinematic expectation from the CMB dipole and challenges the Cosmological Principle; and optimal transport reconstruction of the linear density field using the distribution of matter at low redshift, benefiting a.o. the precision of baryon acoustic oscillation measurements.

Research Areas

Astrophysics and cosmology — observational and theoretical cosmology, covering large-scale structure, the cosmic microwave background, and fundamental tests of the ΛCDM standard model of cosmology, with a strong statistical and computational component. I am joining as an Associate Research Scientist, working with Prof. Nikhil Padmanabhan.

Biography

I completed my PhD at the Niels Bohr Institute, University of Copenhagen, Denmark. I undertook my postdoctoral research at INRIA Nancy and Institut d’Astrophysique de Paris, France, and subsequently at the University of Oxford, where I was as a Fellow of the Carlsberg Foundation, where I worked alongside Prof Subir Sarkar, and later Beecroft Fellow in Cosmology, where I worked in the group of Prof Pedro Ferreira. At the University of Oxford I also was Lecturer in Physics for Balliol College. I just joined Yale Physics as Associate Research Scientist in the group of Prof Nikhil Padmanabhan.

Education

Ph.D. 2019 - Niels Bohr Institute / University of Copenhagen

Select Publications

S. von Hausegger, The expected kinematic matter dipole is robust against source evolution, Mon. Not. Roy. Astron. Soc. 535, L49 (2024)

N. J. Secrest, S. von Hausegger, M. Rameez, R. Mohayaee, S. Sarkar, Colloquium: The Cosmic Dipole Anomaly, Rev. Mod. Phys. 97, 041001 (2025)

S. von Hausegger, C. Dalang, Redshift tomography of the kinematic matter dipole, Phys. Rev. D 111, 123547 (2025)

B. Lévy, R. Mohayaee, S. von Hausegger, A fast semidiscrete optimal transport algorithm for a unique reconstruction of the early Universe, Mon. Not. Roy. Astron. Soc. 506, 1165 (2021)

S. von Hausegger, B. Lévy, R. Mohayaee, Accurate Baryon Acoustic Oscillations Reconstruction via Semidiscrete Optimal Transport, Phys. Rev. Lett. 128, 201302 (2022)

Contact Info

sebastian.vonhausegger@yale.edu

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