Abigail Fraeman

Lifting the Veil on the Dark Sector of the Universe

Personal Website

Where is he NOW? - Department of Physics, Harvard University

"As a theoretical cosmologist, my research focuses on unravelling the mystery of dark matter. My objective as a Keck Institute Postdoctoral Fellow is to develop new analysis techniques that could dramatically improve our knowledge of the dark-matter sector. Coupled to a dedicated future space-based observatory such as OMEGA, our analysis has the potential to answer deep questions about the dark sector. What particles does it contain? What are their properties? Are there new fundamental interactions? A possible avenue to address these questions is to study the distribution of dark-matter substructures within galactic halos through gravitational lensing. Nevertheless, much work is still needed to turn gravitational-lensing data into information about the whole population of substructures within halos. Specifically, my work consists in developing new analytical and numerical tools to characterize the whole ensemble of substructures using gravitational-lensing data. With these tools in place, we will be able to use observations of known lenses to accurately infer the properties of their substructures and link these to the corresponding key physics governing the dark-matter sector." (September 2012)


  1. ETHOS - An Effective Theory of Structure Formation: From dark particle physics to the matter distribution of the Universe. arXiv:1512.05344 [pdfother]
    Francis-Yan Cyr-Racine, Kris Sigurdson, Jesus Zavala, Torsten Bringmann, Mark Vogelsberger, Christoph Pfrommer
  2. Wandering in the Lyman-alpha Forest: A Study of Dark Matter-Dark Radiation Interactions. arXiv:1705.08894 [pdfother]
    Rebecca Krall, Francis-Yan Cyr-Racine, Cora Dvorkin
  3. Dark Catalysis. arXiv:1702.05482 [pdfother]
    Prateek Agrawal, Francis-Yan Cyr-Racine, Lisa Randall, Jakub Scholtz
  4. Make Dark Matter Charged Again. arXiv:1610.04611 [pdfother]
    Prateek Agrawal,  Francis-Yan Cyr-Racine, Lisa Randall, Jakub Scholtz
  5. On the Power Spectrum of Dark Matter Substructure in Strong Gravitational Lenses. arXiv:1707.04590 [pdfother]
    Ana Diaz Rivero,  Francis-Yan Cyr-Racine, Cora Dvorkin
  6. A tale of two modes: Neutrino free-streaming in the early universe. arXiv:1704.06657 [pdfother]
    Lachlan Lancaster,  Francis-Yan Cyr-Racine, Lloyd Knox, Zhen Pan
  7. Probing the small-scale structure in strongly lensed systems via transdimensional inference. arXiv:1706.06111 [pdfother]
    Tansu Daylan,  Francis-Yan Cyr-Racine, Ana Diaz Rivero, Cora Dvorkin, Douglas P. Finkbeiner
  8. CMB-S4 Science Book, First Edition. arXiv:1610.02743 [pdfother]
    Kevork N. Abazajian, Peter Adshead, Zeeshan Ahmed, Steven W. Allen, David Alonso, Kam S. Arnold, et al.
  9. A Dark Census: Statistically Detecting the Satellite Populations of Distant Galaxies. arXiv:1506.01724 [pdfother]
    Francis-Yan Cyr-Racine, Leonidas A. Moustakas, Charles R. Keeton,  Kris Sigurdson, Daniel A. Gilman
  10. ETHOS - An Effective Theory of Structure Formation: Dark matter physics as a possible explanation of the small-scale CDM problems. arXiv:1512.05349 [pdfother]
    Mark Vogelsberger, Jesus Zavala,  Francis-Yan Cyr-Racine, Christoph Pfrommer, Torsten Bringmann,  Kris Sigurdson
  11. Sterile neutrino dark matter: A tale of weak interactions in the strong coupling epoch. arXiv:1507.06655 [pdfother]
    Tejaswi Venumadhav,  Francis-Yan Cyr-Racine, Kevork N. Abazajian, Christopher M. Hirata
  12. Limits on Neutrino-Neutrino Scattering in the Early Universe. arXiv:1306.1536 [pdfother]
    Francis-Yan Cyr-Racine,  Kris Sigurdson
  13. Scattering, Damping, and Acoustic Oscillations: Simulating the Structure of Dark Matter Halos with Relativistic Force Carriers. arXiv:1405.2075 [pdfother]
    Matthew R. Buckley,  Jesús Zavala,  Francis-Yan Cyr-Racine,  Kris Sigurdson,  Mark Vogelsberger
  14. Constraints on Large-Scale Dark Acoustic Oscillations from Cosmology. arXiv:1310.3278 [pdfother]
    Francis-Yan Cyr-Racine,  Roland de Putter,  Alvise Raccanelli,  Kris Sigurdson
  15. The Cosmology of Atomic Dark Matter. arXiv:1209.5752 [pdfother]
    Francis-Yan Cyr-Racine,  Kris Sigurdson
  16. Oscillating Bispectra and Galaxy Clustering: A Novel Probe of Inflationary Physics with Large-Scale Structure. arXiv:1106.2806 [pdfpsother]
    Francis-Yan Cyr-Racine,  Fabian Schmidt
  17. Photons and Baryons before Atoms: Improving the Tight-Coupling Approximation. arXiv:1012.0569 [pdfother]
    Francis-Yan Cyr-Racine,  Kris Sigurdson
  18. Reheating in Inflationary Cosmology: Theory and Applications. arXiv:1001.2600 [pdfpsother]
    Rouzbeh Allahverdi,  Robert Brandenberger,  Francis-Yan Cyr-Racine,  Anupam Mazumdar
  19. Protohalo Constraints to the Resonant Annihilation of Dark Matter. arXiv:0904.3933 [pdfother]
    Francis-Yan Cyr-Racine,  Stefano Profumo,  Kris Sigurdson
  20. Study of the Growth of Entropy Modes in MSSM Flat Directions Decay: Constraints on the Parameter Space. arXiv:0811.4457 [pdfother]
    Francis-Yan Cyr-Racine, Robert H. Brandenberger
  21. Benchmarking quantum control methods on a 12-qubit system. arXiv:quant-ph/0603248 [pdfpsother]
    C. Negrevergne,  T.S. Mahesh, C. A. Ryan, M. Ditty, F. Cyr-Racine, W. Power, N. Boulant, T. Havel, D.G. Cory, R. Laflamme

11/7/2013 news brief about "Eavesdropping on Dark Sound Shrinks the Shadow Universe" in New Scientist