I am a Kavli Postdoctoral Fellow at the Stanford University in the Kavli Institute for Particle Astrophysics and Cosmology (KIPAC). Before joining Stanford, I was a Postdoctoral Scholar at University of California, Los Angeles (UCLA) in the Department of Physics and Astronomy and I did my PhD at ETH Zurich in the cosmology research group. My current research focus on dark matter and dark energy. I am using strong gravitational lensing to probe the imprint of dark matter on the structure in our Universe and measuring the expansion rate of our Universe with time-delay cosmography to probe dark energy. My scientific expertise is the interface between the exquisite data sets available on one side and the fundamental theory predictions on the other side. I am actively developing advanced computational and statistical tools - publicly available - to contribute the community in pushing the boundaries of our knowledge sphere.
In the pressHere is an incomplete list that features news articles of research I am involved in:
- Gravitational lenses could hold the key to better estimates of the expansion of the universe: Stanford/SLAC press release, Nov 2020.
- New measurement may resolve cosmological crisis: LiveScience, July 2021.
- Cosmic magnifying glasses yield independent measurement of Universe's expansion: NASA press release, Jan 2020.
- Hubble detects smallest known dark matter clumps: NASA press release, Jan 2020.
- Fast radio bursts could help solve the mystery of the universe’s expansion: ScienceNews, Apr 2021.
- Eight New Quadruple Lenses Aren't Just Gorgeous, They Reveal Dark Matter's Temperature: Forbes, Jan 2020.
- Astronomically Rare 'Double Lens' Yields Best Single System Measurement Of Cosmic Expansion: Forbes, Oct 2019.
- Something is seriously wrong with our understanding of the cosmos: NewScientist, Jul 2019.
- Seeing double could help resolve dispute about how fast the universe is expanding: ScienceDaily, Jan 2019.
- Split images of quasars allow scientists to calculate Hubble constant : UPI, Jan 2019.
- Seeing double could help resolve dispute about how fast the universe is expanding: EurekAlert (American Association for the Advancement of Science), Jan 2019.
- New estimate of Hubble constant derived using a doubly imaged quasar: Computing, Jan 2019.
- Doubly Imaged Quasar Used To Measure Universe Expansion : SpaceRef, Jan 2019.
- New Measurement Of The Expansion Rate Of The Universe Continues To Show Major Discrepancy : IFL Science, Jan 2019.
- Female authors get fewer citations in astronomy: ScienceMagazine.org, May 2017.
- Gender bias in astronomy quantified: ETH Zurich press release, May 2017.
- Treffpunkt Bern: Austausch mit Bundesrätin Doris Leuthard: Report on a meeting I co-organized with the Swiss Federal Minister of Energy about transforming the energy system (German), Nov 2014.
- Gesucht: Die Geschichte unseres Universums: Interview with the association of Swiss Scientific Olympiads, Aug 2017.
Recorded talksHere are some talks I have given that were recorded (for either public or scientific audiences):
- Cosmology Talk: youtube recorded talk about my latest work on the Hubble constant, July 2020
- Stanford Astrophysics Colloquium: Probing fundamental physics with strong gravitational lensing, July 2020.
- BSM PANDEMIC Seminars: Measuring the Hubble constant and constraining the nature of Dark Matter with strong gravitational lensing, July 2020.
Working in collaborationsI am an active member of the following collaborations:
- TDCOSMO: Collaboration to measure the expansion rate of the universe with strong lensing time-delay cosmography (merged from H0LiCOW, STRIDES, SHARP, COSMOGRAIL). I am the lead author of the latest analysis adn co-supervise several students heavily involved in this project.
- H0LiCOW: Collaboration to measure the expansion rate of the universe with strong lensing time-delay cosmography. Since 2017 I am a member of the H0LiCOW collaboration. I took the lead in modelling a quasar lens to measure the Hubble constant.
- Dark Energy Survey: A wide field photometric survey to map hundreds of millions of galaxies, detect thousands of supernovae, and find patterns of cosmic structure to probe dark energy. I am the co-convener of the Strong Lensing working group and a science committee member. I got data rights access for an equivalent year of infrastructure work.
- STRIDES: Is an external collaboration of the Dark Energy Survey, primarily aimed at finding ~100 gravitationally lensed quasars in the Dark Energy Survey. I am a co-PI and actively contribute to the modelling of candidate systems and co-lead the analysis to measure the Hubble constant from one of the discovered lenses.
- LSST-DESC: LSST Dark Energy Science Collaboration. I am a member and involved in a project to apply machine learning techniques and hierarchical inference methods to be applied to the large sample of quasar lenses expected to be discovered by LSST.
- Deep Skies Lab: A community that fosters knowledge transfer for the accelerated application of artificial intelligence to astronomical challenges. I am a member and provide simulation tools and pipelines to provide to the broader AI community to explore the potential for AI applications in the field of cosmology and strong lensing in particular.
- Keck All-Sky Precision Adaptive Optics (KAPA): A next generation adaptive optics setup for the 8-m W. M. Keck telescope on Maunakea, Hawaii. I am a science team member.
- Hyper Suprime-Cam Survey: Large survey program with the 10-m Subaru telescope on Manakea. I am an external collaborator participating in the galaxy morphology and quasar-host galaxy projects.
- SkyPy project: Open source software development project to forward model the sky. I am a development team member.
- LensWatch: A loose collaboration of groups searching for lensed SNe with targeted surveys of known strong-lensing systems.
- LSST Strong Lensing Science Collaboration: LSST collaboration coordinating different efforts within strong lensing science cases.