Martin Sahlén
Researcher at Department of Physics and Astronomy; Astronomy and Space Physics
- Telephone:
- +46 18 471 59 70
- E-mail:
- martin.sahlen@physics.uu.se
- Visiting address:
- Ångströmlaboratoriet, Lägerhyddsvägen 1
- Postal address:
- Box 516
751 20 UPPSALA
- ORCID:
- 0000-0003-0973-4804
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Short presentation
Docent in astronomy with specialization in astrophysics.
RESEARCH
2021-2026: PI, "The Galaxy – Dark Matter Connection with HST, JWST and EUCLID" (8 MSEK)
2022-2024: PI, "Searching for New Physics in the Early Universe" (1 MSEK)
2023-2027: PI, "Astronomical object classification and anomaly detection with complex spectroscopic 4MOST data sets" (4 MSEK)
TEACHING
Responsible for and teacher on the transdisciplinary course "Three Views on Cosmology" (10 hp).
Keywords
- astronomy
- astrophysics
- bayesian inference
- cosmology
- docent
Biography
Hemsida: http://www.astro.uu.se/~msahlen/
Martin Sahlén is docent and researcher in astronomy with specialization in astrophysics at Uppsala University. He studied at the Royal Institute of Technology (KTH) and Cambridge, earned his PhD from the University of Sussex in 2009, and was a postdoctoral fellow at Cambridge, Stockholm and Oxford. He was a Fulbright fellow at Johns Hopkins, and a Natural Sciences fellow at the Swedish Collegium for Advanced Study. He joined Uppsala University in 2016.
Sahlén's research focuses on the large-scale structure of the Universe, and its connection to astrophysics and fundamental physics. In particular, he is investigating the very first generations of galaxies, and late-Universe galaxy distributions. Recent work includes the demonstration of the power of galaxy clusters and cosmic voids as probes of deviations from General Relativity and to measure the mass of neutrinos, the first cosmological parameter estimation based on cosmic voids, and discovery of a powerful new test of modified gravity theories. He is member of the 4-metre Multi-Object Spectroscopic Telescope (4MOST), the BUFFALO survey, the Euclid Consortium, the SKA Observatory, and an external collaborator in the Dark Energy Survey. Sahlén also works on the philosophy of astrophysics and cosmology. His research was highlighted in “The Best Writing on Mathematics 2018”.
Research
Theoretical and observational studies of the large-scale structure of the Universe through clusters of galaxies, voids, and the first galaxies in the Universe - to understand galaxy astrophysics/star formation, dark energy, dark matter, cosmic inflation, and the reionization process in the early Universe.
Participant in the scientific projects 4MOST, BUFFALO, Euclid, and SKA Observatory. External Collaborator in the Dark Energy Survey. Also participating in the scientific exploitation of data from the Hubble Space Telescope and the coming James Webb Space Telescope.
Theoretical studies of the philosophy of cosmology, such as model inference, fine-tuning of the constants of nature, and multiverse explanations.
Publications
Recent publications
- Euclid preparation XLI. Galaxy power spectrum modelling in real space (2024)
- Euclid preparation (2024)
- The XMM cluster survey (2023)
- Euclid (2022)
- Euclid (2022)
All publications
Articles
- Euclid preparation XLI. Galaxy power spectrum modelling in real space (2024)
- Euclid preparation (2024)
- The XMM cluster survey (2023)
- Euclid (2022)
- Euclid (2022)
- The XMM Cluster Survey (2022)
- Conditions for detecting lensed Population III galaxies in blind surveys with the James Webb Space Telescope, the Roman Space Telescope, and Euclid (2022)
- Velocity dispersions of clusters in the Dark Energy Survey Y3 redMaPPer catalogue (2022)
- Environmental dependence of X-ray and optical properties of galaxy clusters (2021)
- Galaxy population constraints on cosmology and star formation in the early Universe (2021)
- Cosmology with Phase 1 of the Square Kilometre Array Red Book 2018 (2020)
- Stellar mass as a galaxy cluster mass proxy (2020)
- Fundamental physics with the Square Kilometre Array (2020)
- Bubble mapping with the Square Kilometre Array (2020)
- 4MOST (2019)
- Mass variance from archival X-ray properties of Dark Energy Survey Year-1 galaxy clusters (2019)
- 4MOST Consortium Survey 5 (2019)
- 4MOST Consortium Survey 8 (2019)
- Cluster-void degeneracy breaking: Neutrino properties and dark energy (2019)
- Dark Energy Surveyed Year 1 results (2019)
- Galaxies in X-ray selected clusters and groups in Dark Energy Survey data - II. Hierarchical Bayesian modelling of the red-sequence galaxy luminosity function (2019)
- Cluster-void degeneracy breaking (2018)
- The XXL survey (2017)
- The XMM Cluster Survey (2016)
- The XMM Cluster Survey (2016)