Bio


I am a KIPAC Postdoctoral Fellow at Stanford University since Fall 2019. Before joining Stanford I was a Postdoctoral Researcher at the University of California, Los Angeles (UCLA) in the department of Physics and Astronomy and did my PhD at ETH Zurich in the cosmology research group.

Professional Education


  • Doctor of Science, Eidgenossische Technische Hochschule (ETH Zurich) (2017)
  • Master of Science, Eidgenossische Technische Hochschule (ETH Zurich) (2013)
  • Bachelor of Science, Eidgenossische Technische Hochschule (ETH Zurich) (2011)

Stanford Advisors


Current Research and Scholarly Interests


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.

All Publications


  • The Sizes of Quasar Host Galaxies in the Hyper Suprime-Cam Subaru Strategic Program ASTROPHYSICAL JOURNAL Li, J., Silverman, J. D., Ding, X., Strauss, M. A., Goulding, A., Birrer, S., Yesuf, H. M., Xue, Y., Kawinwanichakij, L., Matsuoka, Y., Toba, Y., Nagao, T., Schramm, M., Inayoshi, K. 2021; 918 (1)
  • Snowmass2021-Letter of interest cosmology intertwined IV: The age of the universe and its curvature ASTROPARTICLE PHYSICS Di Valentino, E., Anchordoqui, L. A., Akarsu, O., Ali-Haimoud, Y., Amendola, L., Arendse, N., Asgari, M., Ballardini, M., Basilakos, S., Battistelli, E., Benetti, M., Birrer, S., Bouchet, F. R., Bruni, M., Calabrese, E., Camarena, D., Capozziello, S., Chen, A., Chluba, J., Chudaykin, A., Colgain, E. O., Cyr-Racine, F., de Bernardis, P., de Cruz Perez, J., Delabrouille, J., Escamilla-Rivera, C., Ferte, A., Finelli, F., Freedman, W., Frusciante, N., Giusarma, E., Gomez-Valent, A., Handley, W., Harrison, I., Hart, L., Heavens, A., Hildebrandt, H., Holz, D., Huterer, D., Ivanov, M. M., Joudaki, S., Kamionkowski, M., Karwal, T., Knox, L., Kumar, S., Lamagna, L., Lesgourgues, J., Lucca, M., Marra, V., Masi, S., Matarrese, S., Mazumdar, A., Melchiorri, A., Mena, O., Mersini-Houghton, L., Miranda, V., Moreno-Pulido, C., Mota, D. F., Muir, J., Mukherjee, A., Niedermann, F., Notari, A., Nunes, R. C., Pace, F., Paliathanasis, A., Palmese, A., Pan, S., Paoletti, D., Pettorino, V., Piacentini, F., Poulin, V., Raveri, M., Riess, A. G., Salzano, V., Saridakis, E. N., Sen, A. A., Shafieloo, A., Shajib, A. J., Silk, J., Silvestri, A., Sloth, M. S., Smith, T. L., Sola Peracaula, J., van de Bruck, C., Verde, L., Visinelli, L., Wandelt, B. D., Wang, D., Wang, J., Yadav, A. K., Yang, W. 2021; 131
  • Snowmass2021-Letter of interest cosmology intertwined I: Perspectives for the next decade ASTROPARTICLE PHYSICS Di Valentino, E., Anchordoqui, L. A., Akarsu, O., Ali-Haimoud, Y., Amendola, L., Arendse, N., Asgari, M., Ballardini, M., Basilakos, S., Battistelli, E., Benetti, M., Birrer, S., Bouchet, F. R., Bruni, M., Calabrese, E., Camarena, D., Capozziello, S., Chen, A., Chluba, J., Chudaykin, A., Colgain, E. O., Cyr-Racine, F., de Bernardis, P., Perez, J., Delabrouille, J., Dunkley, J., Escamilla-Rivera, C., Ferte, A., Finelli, F., Freedman, W., Frusciante, N., Giusarma, E., Gomez-Valent, A., Handley, W., Harrison, I., Hart, L., Heavens, A., Hildebrandt, H., Holz, D., Huterer, D., Ivanov, M. M., Joudaki, S., Kamionkowski, M., Karwal, T., Knox, L., Kumar, S., Lamagna, L., Lesgourgues, J., Lucca, M., Marra, V., Masi, S., Matarrese, S., Mazumdar, A., Melchiorri, A., Mena, O., Mersini-Houghton, L., Miranda, V., Moreno-Pulido, C., Mota, D. F., Muir, J., Mukherjee, A., Niedermann, F., Notari, A., Nunes, R. C., Pace, F., Paliathanasisa, A., Palmese, A., Pan, S., Paoletti, D., Pettorino, V., Piacentini, F., Poulin, V., Raveri, M., Riess, A. G., Salzano, V., Saridakis, E. N., Sen, A. A., Shafieloo, A., Shajib, A. J., Silkb, J., Silvestri, A., Sloth, M. S., Smith, T. L., Peracaula, J., van de Bruck, C., Verde, L., Visinelli, L., Wandeltb, B. D., Wang, D., Wang, J., Yadav, A. K., Yang, W. 2021; 131
  • Cosmology intertwined III: f sigma(8) and S-8 ASTROPARTICLE PHYSICS Di Valentino, E., Anchordoqui, L. A., Akarsu, O., Ali-Haimoud, Y., Amendola, L., Arendse, N., Asgari, M., Ballardini, M., Basilakos, S., Battistelli, E., Benetti, M., Birrer, S., Bouchet, F. R., Bruni, M., Calabrese, E., Camarena, D., Capozziello, S., Chen, A., Chluba, J., Chudaykin, A., Colgain, E. O., Cyr-Racine, F., de Bernardis, P., Perez, J., Delabrouille, J., Dunkley, J., Escamilla-Rivera, C., Ferte, A., Finelli, F., Freedman, W., Frusciante, N., Giusarma, E., Gomez-Valent, A., Handley, W., Harrison, I., Hart, L., Heavens, A., Hildebrandt, H., Holz, D., Huterer, D., Ivanov, M. M., Joudaki, S., Kamionkowski, M., Karwal, T., Knox, L., Kumar, S., Lamagna, L., Lesgourgues, J., Lucca, M., Marra, V., Masi, S., Matarrese, S., Mazumdar, A., Melchiorri, A., Mena, O., Mersini-Houghton, L., Miranda, V., Moreno-Pulido, C., Mota, D. F., Muir, J., Mukherjee, A., Niedermann, F., Notari, A., Nunes, R. C., Pace, F., Paliathanasis, A., Palmese, A., Pan, S., Paoletti, D., Pettorino, V., Piacentini, F., Poulin, V., Raveri, M., Riess, A. G., Salzano, V., Saridakis, E. N., Sen, A. A., Shafieloo, A., Shajib, A. J., Silk, J., Silvestri, A., Sloth, M. S., Smith, T. L., Sola, J., van de Bruck, C., Verde, L., Visinelli, L., Wandelt, B. D., Wang, D., Wang, J., Yadav, A. K., Yang, W. 2021; 131
  • Snowmass2021-Letter of interest cosmology intertwined II: The hubble constant tension ASTROPARTICLE PHYSICS Di Valentino, E., Anchordoqui, L. A., Akarsu, O., Ali-Haimoud, Y., Amendola, L., Arendse, N., Asgari, M., Ballardini, M., Basilakos, S., Battistelli, E., Benetti, M., Birrer, S., Bouchet, F. R., Bruni, M., Calabrese, E., Camarena, D., Capozziello, S., Chen, A., Chluba, J., Chudaykin, A., Colgain, E. O., Cyr-Racine, F., de Bernardis, P., Perez, J., Delabrouille, J., Dunkley, J., Escamilla-Rivera, C., Ferte, A., Finelli, F., Freedman, W., Frusciante, N., Giusarma, E., Gomez-Valent, A., Guy, J., Handley, W., Harrison, I., Hart, L., Heavens, A., Hildebrandt, H., Holz, D., Huterer, D., Ivanov, M. M., Joudaki, S., Kamionkowski, M., Karwal, T., Knox, L., Kumar, S., Lamagna, L., Lesgourgues, J., Lucca, M., Marra, V., Masi, S., Matarrese, S., Mazumdar, A., Melchiorri, A., Mena, O., Mersini-Houghton, L., Miranda, V., Moreno-Pulido, C., Mota, D. F., Muir, J., Mukherjee, A., Niedermann, F., Notari, A., Nunes, R. C., Pace, F., Paliathanasis, A., Palmese, A., Pan, S., Paoletti, D., Pettorino, V., Piacentini, F., Poulin, V., Raveri, M., Riess, A. G., Salzano, V., Saridakis, E. N., Sen, A. A., Shafieloo, A., Shajib, A. J., Silk, J., Silvestri, A., Sloth, M. S., Smith, T. L., Peracaula, J., van de Bruck, C., Verde, L., Visinelli, L., Wandelta, B. D., Wang, D., Wang, J., Yadav, A. K., Yang, W. 2021; 131
  • Dark Matter Constraints from a Unified Analysis of Strong Gravitational Lenses and Milky Way Satellite Galaxies ASTROPHYSICAL JOURNAL Nadler, E. O., Birrer, S., Gilman, D., Wechsler, R. H., Du, X., Benson, A., Nierenberg, A. M., Treu, T. 2021; 917 (1)
  • Improved time-delay lens modelling and H-0 inference with transient sources MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY Ding, X., Liao, K., Birrer, S., Shajib, A. J., Treu, T., Yang, L. 2021; 504 (4): 5621-5628
  • TDCOSMO: V. Strategies for precise and accurate measurements of the Hubble constant with strong lensing ASTRONOMY & ASTROPHYSICS Birrer, S., Treu, T. 2021; 649
  • Dark matter haloes of massive elliptical galaxies at z similar to 0.2 are well described by the Navarro-Frenk-White profile MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY Shajib, A. J., Treu, T., Birrer, S., Sonnenfeld, A. 2021; 503 (2): 2380-2405
  • High-resolution imaging follow-up of doubly imaged quasars MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY Shajib, A. J., Molina, E., Agnello, A., Williams, P. R., Birrer, S., Treu, T., Fassnacht, C. D., Morishita, T., Abramson, L., Schechter, P. L., Wisotzki, L. 2021; 503 (2): 1557-1567
  • Combining strong and weak lensing estimates in the COSMOS field JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS Kuhn, F., Birrer, S., Bruderer, C., Amara, A., Refregier, A. 2021
  • Large-scale Gravitational Lens Modeling with Bayesian Neural Networks for Accurate and Precise Inference of the Hubble Constant ASTROPHYSICAL JOURNAL Park, J., Wagner-Carena, S., Birrer, S., Marshall, P. J., Lin, J., Roodman, A. 2021; 910 (1)
  • Hierarchical Inference with Bayesian Neural Networks: An Application to Strong Gravitational Lensing ASTROPHYSICAL JOURNAL Wagner-Carena, S., Park, J., Birrer, S., Marshall, P. J., Roodman, A., Wechsler, R. H., LSST Dark Energy Sci Collaboration 2021; 909 (2)
  • Testing the evolution of correlations between supermassive black holes and their host galaxies using eight strongly lensed quasars MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY Ding, X., Treu, T., Birrer, S., Agnello, A., Sluse, D., Fassnacht, C., Auger, M. W., Wong, K. C., Suyu, S. H., Morishita, T., Rusu, C. E., Galan, A. 2021; 501 (1): 269–80
  • The evolution of the size-mass relation at z=1-3 derived from the complete Hubble Frontier Fields data set MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY Yang, L., Roberts-Borsani, G., Treu, T., Birrer, S., Morishita, T., Bradac, M. 2021; 501 (1): 1028–37
  • The impact of mass map truncation on strong lensing simulations ASTRONOMY & ASTROPHYSICS Van de Vyvere, L., Sluse, D., Mukherjee, S., Xu, D., Birrer, S. 2020; 644
  • H0LiCOW XII. Lens mass model of WFI2033-4723 and blind measurement of its time-delay distance and H-0 MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY Rusu, C. E., Wong, K. C., Bonvin, V., Sluse, D., Suyu, S. H., Fassnacht, C. D., Chan, J. H., Hilbert, S., Auger, M. W., Sonnenfeld, A., Birrer, S., Courbin, F., Treu, T., Chen, G., Halkola, A., Koopmans, L. E., Marshall, P. J., Shajib, A. J. 2020; 498 (1): 1440–68
  • H0LiCOW-XIII. A 2.4 per cent measurement of H-0 from lensed quasars: 5.3 sigma tension between early- and late-Universe probes MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY Wong, K. C., Suyu, S. H., Chen, G., Rusu, C. E., Millon, M., Sluse, D., Bonvin, V., Fassnacht, C. D., Taubenberger, S., Auger, M. W., Birrer, S., Chan, J. H., Courbin, F., Hilbert, S., Tihhonova, O., Treu, T., Agnello, A., Ding, X., Jee, I., Komatsu, E., Shajib, A. J., Sonnenfeld, A., Blandford, R. D., Koopmans, L. E., Marshall, P. J., Meylan, G. 2020; 498 (1): 1420–39
  • The first simultaneous measurement of Hubble constant and post-Newtonian parameter from time-delay strong lensing MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY Yang, T., Birrer, S., Hu, B. 2020; 497 (1): L56–L61
  • A versatile tool for cluster lensing source reconstruction - I. Methodology and illustration on sources in the Hubble Frontier Field Cluster MACS J0717.5+3745 MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY Yang, L., Birrer, S., Treu, T. 2020; 496 (3): 2648–62
  • Cosmic dissonance: are new physics or systematics behind a short sound horizon? ASTRONOMY & ASTROPHYSICS Arendse, N., Wojtak, R. J., Agnello, A., Chen, G., Fassnacht, C. D., Sluse, D., Hilbert, S., Millon, M., Bonvin, V., Wong, K. C., Courbin, F., Suyu, S. H., Birrer, S., Treu, T., Koopmans, L. E. 2020; 639
  • Core or Cusps: The Central Dark Matter Profile of a Strong Lensing Cluster with a Bright Central Image at Redshift 1 ASTROPHYSICAL JOURNAL Collett, T. E., Buckley-Geer, E., Lin, H., Bacon, D., Nichol, R. C., Nord, B., Morice-Atkinson, X., Amara, A., Birrer, S., Kuropatkin, N., More, A., Papovich, C., Romer, K. K., Tessore, N., Abbott, T. C., Allam, S., Annis, J., Benoit-Levy, A., Brooks, D., Burke, D. L., Kind, M., Castander, F. J., D'Andrea, C. B., da Costa, L. N., Desai, S., Diehl, H., Doel, P., Eifler, T. F., Flaugher, B., Frieman, J., Gerdes, D. W., Goldstein, D. A., Gruen, D., Gschwend, J., Gutierrez, G., James, D. J., Kuehn, K., Kuhlmann, S., Lahav, O., Li, T. S., Lima, M., Maia, M. G., March, M., Marshall, J. L., Martini, P., Melchior, P., Miquel, R., Plazas, A. A., Rykoff, E. S., Sanchez, E., Scarpine, V., Schindler, R., Schubnell, M., Sevilla-Noarbe, I., Smith, M., Sobreira, F., Suchyta, E., Swanson, M. C., Tarle, G., Tucker, D. L., Walker, A. R. 2017; 843 (2)