Joshua A. Frieman


Ph.D., Physics, University of Chicago, 1985
Contact Information
Phone: (773)702-7971
Location: TAAC 24
WWW: Web Site
The 2.5-meter telescope at Apache Point Observatory, named the Sloan Foundation Telescope in recognition of the pivotal and generous support of the Alfred P. Sloan Foundation through all phases of the SDSS.
Josh Frieman is a senior staff member (Scientist III) in the Theoretical Astrophysics group at Fermilab and the Fermilab Center for Particle Astrophysics. He is also Professor of Astronomy and Astrophysics at the University of Chicago, where he is a member of the Kavli Institute for Cosmological Physics.
Frieman earned a B.Sc. degree from Stanford (1981) and a PhD in Physics from the University of Chicago (1985). After a postdoc in the SLAC Theory Group, he joined the scientific staff at Fermilab in 1988. He served as Head of the Theoretical Astrophysics Group from 1994 to 1999. He is a Fellow of the American Physical Society and of the American Association for the Advancement of Science and a Trustee of the Aspen Center for Physics. He has served on the Executive Committee of the APS Divison of Astrophysics, on the Particle Physics Project Prioritization Panel (P5) of HEPAP, on the Astro 2010 Decadal Survey Committee, and on the Astronomy and Astrophysics Advisory Committee (AAAC).

Frieman's research centers on theoretical and observational cosmology, including studies of the nature of dark energy, the early Universe, gravitational lensing, the large-scale structure of the Universe, and supernovae as cosmological distance indicators. The author of over 230 publications, he led the Sloan Digital Sky Survey (SDSS-II) Supernova Survey, which discovered over 500 type Ia supernovae for cosmology studies, and served as chair of the SDSS Collaboration Council. He is a founder of and currently serves as Director of the Dark Energy Survey, a collaboration of over 120 scientists from 20 institutions on 3 continents, which is building a 570-Megapixel camera to carry out a wide-field survey on the Blanco 4-meter telescope at Cerro Tololo Inter-American Observatory in Chile to probe the origin of cosmic acceleration.

Ongoing Scientific Projects:

Past Scientific Projects: Nearby Supernova Factory (SNfactory)
KICP Highlights & News

Talks, Lectures, & Workshops

Past Students

GRADUATE: Felipe Marin (2010), Carlos E. Cunha (2008), Benjamin E. Dilday (2008), David Johnston (2003), Jonathan Mitchell (2003), Craig Wiegert (2003)

UNDERGRADUATE: Alex Lanzano (2013), Rebecca Pierce (2013)
Currently in Committees
  • Wednesday Colloquium committee
  • Appointments committee
  • PFC Executive committee

KICP Publications
2014 | 2013 | 2012 | 2011 | 2010 | 2009 | 2008 | 2007 | 2006 | 2005 | 2004 | 2003 | 2002 | 2001

Latest Journal Publications
  1. "Host Galaxy Spectra and Consequences for Supernova Typing from the SDSS SN Survey", The Astronomical Journal, Volume 147, Issue 4, article id. 75, 24 pp. (2014) (Apr 2014)
  2. "Optimizing spectroscopic and photometric galaxy surveys: efficient target selection and survey strategy", Monthly Notices of the Royal Astronomical Society, Volume 438, Issue 3, p.2218-2232 (Mar 2014)
  3. "Discovery and Classification of Two z ~ 0.7 DES SNe with Gemini-South", The Astronomer's Telegram, #5985 (Mar 2014)
  4. "The Effect of Weak Lensing on Distance Estimates from Supernovae", The Astrophysical Journal, Volume 780, Issue 1, article id. 24, 13 pp. (2014) (Jan 2014)
  5. "OzDES Spectroscopic Classification of DES13X3woy", The Astronomer's Telegram, #5757 (Jan 2014)
  6. "Cosmological Parameter Uncertainties from SALT-II Type Ia Supernova Light Curve Models", arXiv:1401.4065 (Jan 2014)
  7. "Improved cosmological constraints from a joint analysis of the SDSS-II and SNLS supernova samples", arXiv:1401.4064 (Jan 2014)
  8. "The Data Release of the Sloan Digital Sky Survey-II Supernova Survey", arXiv:1401.3317 (Jan 2014)
  9. "OzDES Spectroscopic Classification of DES Transients", The Astronomer's Telegram, #5642 (Dec 2013)
  10. "Spectroscopic Confirmation of DES13S2cmm: The first DES Superluminous Supernova", The Astronomer's Telegram, #5603 (Nov 2013)
  11. "OzDES Spectroscopic Classification of DES transients", The Astronomer's Telegram, #5568 (Nov 2013)
  12. "Spectroscopic Confirmation of DES13X1kae", The Astronomer's Telegram, #5548 (Nov 2013)
  13. "Spectroscopic Confirmation of DES13C1feu", The Astronomer's Telegram, #5463 (Oct 2013)
  14. "Properties of Type Ia supernovae inside rich galaxy clusters", Monthly Notices of the Royal Astronomical Society, Volume 434, Issue 2, p.1443-1459 (Sep 2013)
  15. "Hubble Space Telescope and Ground-Based Observations of the Type Iax Supernovae SN 2005hk and SN 2008A", arXiv:1309.4457 (Sep 2013)
  16. "Facilities for Dark Energy Investigations", arXiv:1309.5380 (Sep 2013)
  17. "The Multi-object, Fiber-fed Spectrographs for the Sloan Digital Sky Survey and the Baryon Oscillation Spectroscopic Survey", The Astronomical Journal, Volume 146, Issue 2, article id. 32, 40 pp. (2013) (Aug 2013)
  18. "Optimising Spectroscopic and Photometric Galaxy Surveys: Same-sky Benefits for Dark Energy and Modified Gravity", arXiv:1307.8062 (Jul 2013)
  19. "The impact of camera optical alignments on weak lensing measures for the Dark Energy Survey", Monthly Notices of the Royal Astronomical Society, Volume 431, Issue 4, p.3291-3300 (Jun 2013)
  20. "Star/galaxy separation at faint magnitudes: Application to a simulated Dark Energy Survey", arXiv:1306.5236 (Jun 2013)

Latest Conference Proceedings
  1. "The Dark Energy Survey: Overview", American Astronomical Society, AAS Meeting #221, #335.01 (Jan 2013)
  2. "Correlations Between Type Ia Supernovae and Their Host Galaxies Using the SDSS and Multi-wavelength Photometry", American Astronomical Society, AAS Meeting #221, #106.06 (Jan 2013)
  3. "The Dark Energy Spectrometer: a potential multi-fiber instrument for the Blanco 4-meter Telescope", Ground-based and Airborne Instrumentation for Astronomy IV. Proceedings of the SPIE, Volume 8446, article id. 844656, 13 pp. (2012) (Sep 2012)
  4. "Dark Energy Spectrometer - A Proposed Multi-Fiber Instrument for the Blanco 4 Meter Telescope", American Astronomical Society, AAS Meeting #219, #422.09 (Jan 2012)
  5. "WFC3 and WFPC2 Follow Up of Strong Gravitational Lenses", American Astronomical Society, AAS Meeting #217, #347.03; Bulletin of the American Astronomical Society, Vol. 43, 2011 (Jan 2011)
  6. "SBAS: The Sloan Bright Arcs Survey", American Astronomical Society, AAS Meeting #217, #347.01; Bulletin of the American Astronomical Society, Vol. 43, 2011 (Jan 2011)
  7. "The Dark Energy Survey", American Astronomical Society, AAS Meeting #217, #205.01; Bulletin of the American Astronomical Society, Vol. 43, 2011 (Jan 2011)
  8. "Identifying Faint Supernovae in the SDSS-II SN Survey Data", American Astronomical Society, AAS Meeting #215, #430.21; Bulletin of the American Astronomical Society, Vol. 42, p.359 (Jan 2010)
  9. "Constraining Star-Formation History in SNe Ia Host Galaxies Using Multi-wavelength Photometry", American Astronomical Society, AAS Meeting #215, #430.11; Bulletin of the American Astronomical Society, Vol. 42, p.357 (Jan 2010)
  10. "Type Ia Supernova Rate from SDSS Spectra", American Astronomical Society, AAS Meeting #213, #603.09 (Dec 2009)

Past Visitors:
  1. Steve Kahn, Stanford National Accelerator Laboratory (2014)
  2. Brian Nord, Fermilab (2014)
  3. Natalie Roe, LBNL (2014)
  4. Florian Beutler, University of Western Australia (2012)
  5. Felipe Marin, Swinburne University (2011)
  6. Roberto Trotta, Imperial College London (2011)
  7. Felipe Marin, Swinburne University (2010)
  8. Tamara Davis, University of Queensland (2009)
  9. Renee Hlozek, University of Oxford (2009)
  10. Alexandra Abate, University College London (2008)
  11. Manda Banerji, University College London (2008)
  12. Alison Coil, University of California, San Diego (2008)
  13. Tamara Davis, University of Queensland (2008)
  14. Eanna Flanagan, Cornell University (2008)
  15. Marcelo Gleiser, Dartmouth College (2008)
  16. Ofer Lahav, University College London (2008)
  17. Julie McEnery, NASA, Goddard Space Flight Center (2008)
  18. Jean Quashnock, Carthage College (2007)
  19. Mat Smith, University of Portsmouth (2007)
  20. Joseph Zuntz, Imperial College, London (2007)
  21. Anna Cabre Albos, Institut d'Estudis Espacials de Catalunya (2006)
  22. David Cinabro, Wayne State University (2006)
  23. Rogerio Rosenfeld, Instituto de Fisica Teorica-UNESP (2006)
  24. Masao Sako, University of Pennsylvania (2006)
  25. Brandon Allgood, University of California, Santa Cruz (2005)
  26. Lifan Wang, Lawrence Berkeley National Laboratory (2005)
  27. Alexander Conley, University of California, Berkeley (2004)
  28. Masao Sako, Stanford University (2004)
  29. Roman Scoccimarro, New York University (2004)
  30. Andreas Berlind, New York University (2003)
  31. Enrique Gaztanaga, Instituto Nacional de Astrofisica (2002)
  32. Timothy McKay, University of Michigan (2002)
  33. Erin Sheldon, University of Michigan (2002)