Alex Krolewski

Alex Krolewski profile photo
University of Waterloo
Affiliate
Areas of research:
Cosmology
Particle Physics
I am a cosmologist interested in mapping the buildup of cosmic structure and testing gravity and the standard cosmological model on the largest scales. In particular I use gravitational lensing of the cosmic microwave background to constrain the amplitude and growth of structure formation. I am also interested in other CMB secondary anisotropies such as the Sunyaev-Zel'dovich effect; galaxy formation and evolution; exploiting the combined power of photometric and spectroscopic surveys; and the intergalactic medium. I am a member of the DESI, Simons Observatory, and CMB S4 collaborations.
  • AMTD Fellow, University of Waterloo, 2020-present
  • PhD Astrophysics, University of California Berkeley, 2015-2020
  • Ruggeri, R., Blake, C., DeRose, J., Garcia-Quintero, C., Hadzhiyska, B., Ishak, M., . . . Tarlé, G. (2023). A data compression and optimal galaxy weights scheme for Dark Energy Spectroscopic Instrument and weak lensing data sets. Monthly Notices of the Royal Astronomical Society, 525(3), 3865-3878. doi:10.1093/mnras/stad1651
  • Hadzhiyska, B., Yuan, S., Blake, C., Eisenstein, D. J., Aguilar, J., Ahlen, S., . . . Zhou, Z. (2023). Synthetic light-cone catalogues of modern redshift and weak lensing surveys with abacussummit. Monthly Notices of the Royal Astronomical Society, 525(3), 4367-4387. doi:10.1093/mnras/stad2563
  • Zhang, B., Lee, K. -G., Krolewski, A., Shi, J., Horowitz, B., & Kooistra, R. (2023). Alignments between Galaxies and the Cosmic Web at z ~ 1–2 in the IllustrisTNG Simulations. The Astrophysical Journal, 954(1), 49. doi:10.3847/1538-4357/ace695
  • Rezaie, M., Ross, A. J., Seo, H. -J., Kong, H., Porredon, A., Samushia, L., . . . Zou, H. (2023). Local primordial non-Gaussianity from the large-scale clustering of photometric DESI luminous red galaxies. arxiv:2307.01753v1
  • Han, J. J., Dey, A., Price-Whelan, A. M., Najita, J., Schlafly, E. F., Saydjari, A., . . . Zucker, C. (2023). NANCY: Next-generation All-sky Near-infrared Community surveY. arxiv:2306.11784v1
  • Collaboration, D. E. S. I., Adame, A. G., Aguilar, J., Ahlen, S., Alam, S., Aldering, G., . . . Zu, Y. (2023). Validation of the Scientific Program for the Dark Energy Spectroscopic Instrument. doi:10.5281/zenodo.7858207
  • Collaboration, D. E. S. I., Adame, A. G., Aguilar, J., Ahlen, S., Alam, S., Aldering, G., . . . Zu, Y. (2023). The Early Data Release of the Dark Energy Spectroscopic Instrument. doi:10.5281/zenodo.7964161
  • Yu, J., Zhao, C., Gonzalez-Perez, V., Chuang, C. -H., Brodzeller, A., Mattia, A. D., . . . Zou, H. (2023). The DESI One-Percent Survey: Exploring A Generalized SHAM for Multiple Tracers with the UNIT Simulation. arxiv:2306.06313v3
  • Hadzhiyska, B., Yuan, S., Blake, C., Eisenstein, D. J., Aguilar, J. N., Ahlen, S., . . . Zhou, Z. (2023). Synthetic light cone catalogues of modern redshift and weak lensing surveys with AbacusSummit. arxiv:2305.11935v1
  • Krolewski, A., Percival, W. J., Ferraro, S., Chaussidon, E., Rezaie, M., Aguilar, J. N., . . . Zhou, Z. (2023). Constraining primordial non-Gaussianity from DESI quasar targets and Planck CMB lensing. arxiv:2305.07650v1
  • Bolliet, B., Colin Hill, J., Ferraro, S., Kusiak, A., & Krolewski, A. (2023). Projected-field kinetic Sunyaev-Zel'dovich Cross-correlations: halo model and forecasts. Journal of Cosmology and Astroparticle Physics, 2023(03), 039. doi:10.1088/1475-7516/2023/03/039
  • Kusiak, A., Bolliet, B., Krolewski, A., & Hill, J. C. (n.d.). Constraining the galaxy-halo connection of infrared-selected http://www.w3.org/1998/Math/MathML" display="inline">unWISE galaxies with galaxy clustering and galaxy-CMB lensing power spectra. Physical Review D, 106(12). doi:10.1103/physrevd.106.123517
  • Horowitz, B., Lee, K. -G., Ata, M., Müller, T., Krolewski, A., Prochaska, J. X., . . . Lemaux, B. C. (2022). Second Data Release of the COSMOS Lya Mapping and Tomography Observations: The First 3D Maps of the Detailed Cosmic Web at 2.05 < z < 2.55. The Astrophysical Journal Supplement Series, 263(2), 27. doi:10.3847/1538-4365/ac982d
  • Zhang, B., Lee, K. -G., Krolewski, A., Shi, J., Horowitz, B., & Kooistra, R. (2022). Alignments Between Galaxies and the Cosmic Web at $z \sim 1-2$ in the IllustrisTNG Simulations. arxiv:2211.09331v2
  • Abareshi, B., Aguilar, J., Ahlen, S., Alam, S., Alexander, D. M., Alfarsy, R., . . . Zu, Y. (2022). Overview of the Instrumentation for the Dark Energy Spectroscopic Instrument. The Astronomical Journal, 164(5), 207. doi:10.3847/1538-3881/ac882b
  • Ding, Z., Chuang, C. -H., Yu, Y., Garrison, L. H., Bayer, A. E., Feng, Y., . . . Poppett, C. (2022). The DESI N-body Simulation Project – II. Suppressing sample variance with fast simulations. Monthly Notices of the Royal Astronomical Society, 514(3), 3308-3328. doi:10.1093/mnras/stac1501
  • Krolewski, A., & Ferraro, S. (2022). The Integrated Sachs Wolfe effect: unWISE and Planck constraints on dynamical dark energy. Journal of Cosmology and Astroparticle Physics, 2022(04), 033. doi:10.1088/1475-7516/2022/04/033
  • Abazajian, K., Abdulghafour, A., Addison, G. E., Adshead, P., Ahmed, Z., Ajello, M., . . . Zonca, A. (2022). Snowmass 2021 CMB-S4 White Paper. arxiv:2203.08024v1
  • Mukherjee, S., Krolewski, A., Wandelt, B. D., & Silk, J. (2022). Cross-correlating dark sirens and galaxies: measurement of $H_0$ from GWTC-3 of LIGO-Virgo-KAGRA. arxiv:2203.03643v1
  • Hansen, M., Krolewski, A., & Slepian, Z. (2021). Accelerating BAO Scale Fitting Using Taylor Series. doi:10.1093/mnras/stac3542
  • Krolewski, A., Ferraro, S., & White, M. (2021). Cosmological constraints from unWISE and Planck CMB lensing tomography. Journal of Cosmology and Astroparticle Physics, 2021(12), 028. doi:10.1088/1475-7516/2021/12/028
  • Foroozan, S., Krolewski, A., & Percival, W. J. (2021). Testing large-scale structure measurements against Fisher matrix predictions. Journal of Cosmology and Astroparticle Physics, 2021(10), 044. doi:10.1088/1475-7516/2021/10/044
  • Kusiak, A., Bolliet, B., Ferraro, S., Hill, J. C., & Krolewski, A. (n.d.). Constraining the baryon abundance with the kinematic Sunyaev-Zel’dovich effect: Projected-field detection using http://www.w3.org/1998/Math/MathML" display="inline">Planck , http://www.w3.org/1998/Math/MathML" display="inline">WMAP , and http://www.w3.org/1998/Math/MathML" display="inline">unWISE. Physical Review D, 104(4). doi:10.1103/physrevd.104.043518
  • Krolewski, A., & Slepian, Z. (2020). Accelerating computation of the density-field filtering scale s(R) and non-linear mass by an order of magnitude. Monthly Notices of the Royal Astronomical Society, 500(4), 4439-4447. doi:10.1093/mnras/staa3525
  • Lin, X., Cai, Z., Li, Y., Krolewski, A., & Ferraro, S. (2020). Constraining the Halo Mass of Damped Ly$a$ Absorption Systems (DLAs) at $z=2-3.5$ using the Quasar-CMB Lensing Cross-correlation. doi:10.3847/1538-4357/abc620
  • CMB lensing cross-correlations on large scales: a clean probe of primordial non-Gaussianity with DESI qusaars and Planck lensing, CMB S4 Collaboration Meeting, SLAC National Accelerator Laboratory, Menlo Park, United States, 2023/08/01
  • Constraining primordial non-Gaussianity from photometric DESI quasar targets and Planck CMB lensing, Future Science with CMB x LSS, Kyoto University, Yukawa Institute for Theoretical Physics, Kyoto, Japan, 2023/04/12
  • Constraining primordial non-Gaussianity from photometric DESI quasar targets and Planck CMB lensing, DESI Collaboration Meeting, December 2022, Cancun, Mexico, 2022/12/06
  • Cosmology from CMB lensing tomography to z = 2 with galaxies from the unWISE catalog, Oxford Cosmology Seminar, 2022/01/01
  • Cosmology from CMB lensing tomography to z = 2 with galaxies from the unWISE catalog, Cosmology from Home Online Conference, 2022/01/01