Phone: (773)702-7971
Location: ERC 453
Email: friemanfnal.gov
WWW: Web Site

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:

• Dark Energy Survey (DES)

Past Scientific Projects: Sloan Digital Sky Survey (SDSS) | SDSS Supernova Survey (SDSS SS)

Past Students

GRADUATE: James Lasker (2020), Jennifer Helsby (2015), Alan Zablocki (2015), Felipe Marin (2010), Carlos E. Cunha (2008), Benjamin E. Dilday (2008), David Johnston (2003), Jonathan Mitchell (2003), Craig Wiegert (2003)

UNDERGRADUATE: Paul Williams (2015), Alex Lanzano (2013), Rebecca Pierce (2013)

2019 | 2018 | 2017 | 2016 | 2015 | 2014 | 2013 | 2012 | 2011 | 2010 | 2009 | 2008 | 2007 | 2006 | 2005 | 2004 | 2003 | 2002 | 2001


Latest Journal Publications

1. "Measuring linear and non-linear galaxy bias using counts-in-cells in the Dark Energy Survey Science Verification data", Monthly Notices of the Royal Astronomical Society, Volume 482, Issue 2, p.1435-1451 (Nov 2019)
2. "Brown dwarf census with the Dark Energy Survey year 3 data and the thin disc scale height of early L types", Monthly Notices of the Royal Astronomical Society, Volume 489, Issue 4, p.5301-5325 (Nov 2019)
3. "H0LiCOW - X. Spectroscopic/imaging survey and galaxy-group identification around the strong gravitational lens system WFI 2033-4723", Monthly Notices of the Royal Astronomical Society, Volume 490, Issue 1, p.613-633 (Nov 2019)
4. "Dark Energy Survey Year 1 results: validation of weak lensing cluster member contamination estimates from P(z) decomposition", Monthly Notices of the Royal Astronomical Society, Volume 489, Issue 2, p.2511-2524 (Oct 2019)
5. "Phenotypic redshifts with self-organizing maps: A novel method to characterize redshift distributions of source galaxies for weak lensing", Monthly Notices of the Royal Astronomical Society, Volume 489, Issue 1, p.820-841 (Oct 2019)
6. "Methods for cluster cosmology and application to the SDSS in preparation for DES Year 1 release", Monthly Notices of the Royal Astronomical Society, Volume 488, Issue 4, p.4779-4800 (Oct 2019)
7. "The SPTpol Extended Cluster Survey", arXiv:1910.04121 (Oct 2019)
8. "A DECam Search for Explosive Optical Transients Associated with IceCube Neutrino Alerts", The Astrophysical Journal, Volume 883, Issue 2, article id. 125, 18 pp. (2019) (Oct 2019)
9. "Dark Energy Survey Year 1 results: The relationship between mass and light around cosmic voids", Monthly Notices of the Royal Astronomical Society, Advance Access (Oct 2019)
10. "STRIDES: A 3.9 per cent measurement of the Hubble constant from the strong lens system DES J0408-5354", arXiv:1910.06306 (Oct 2019)
11. "Dark Energy Survey Year 1 results: The relationship between mass and light around cosmic voids", arXiv:1909.01386 (Sep 2019)
12. "Chemical Abundance Analysis of Tucana III, the Second r-process Enhanced Ultra-faint Dwarf Galaxy", The Astrophysical Journal, Volume 882, Issue 2, article id. 177, 12 pp. (2019) (Sep 2019)
13. "COSMOGRAIL. XVIII. time delays of the quadruply lensed quasar WFI2033-4723", Astronomy & Astrophysics, Volume 629, id.A97, 13 pp (Sep 2019)
14. "Search for RR Lyrae stars in DES ultra-faint systems: Grus I, Kim 2, Phoenix II, and Grus II", arXiv:1909.06308 (Sep 2019)
15. "H0LiCOW X. Spectroscopic/imaging survey and galaxy-group identification around the strong gravitational lens system WFI 2033-4723", Monthly Notices of the Royal Astronomical Society, Advance Access (Sep 2019)
16. "Brown dwarf census with the Dark Energy Survey year 3 data and the thin disk scale height of early L types", Monthly Notices of the Royal Astronomical Society, Advance Access (Sep 2019)
17. "VizieR Online Data Catalog: Identification of RR Lyrae stars from the DES (Stringer+, 2019)", VizieR On-line Data Catalog: J/AJ/158/16. Originally published in: 2019AJ....158...16S (Sep 2019)
18. "Constraints on the redshift evolution of astrophysical feedback with Sunyaev-Zel'dovich effect cross-correlations", Physical Review D, Volume 100, Issue 6, id.063519 (Sep 2019)
19. "A new RASS galaxy cluster catalogue with low contamination extending to z ˜ 1 in the DES overlap region", Monthly Notices of the Royal Astronomical Society, Volume 488, Issue 1, p.739-769 (Sep 2019)
20. "Dark Energy Survey Year 1 results: the effect of intracluster light on photometric redshifts for weak gravitational lensing", Monthly Notices of the Royal Astronomical Society, Volume 488, Issue 3, p.4389-4399 (Sep 2019)

Latest Conference Proceedings

1. "Dark energy survey operations: years 4 and 5", Proceedings of the SPIE, Volume 10704, id. 107040D 18 pp. (2018) (Jul 2018)
2. "The dark energy survey and operations: years 1 to 3", Proceedings of the SPIE, Volume 9910, id. 99101D 19 pp. (2016) (Jul 2016)
3. "Properties of type Ia supernovae inside rich galaxy clusters", XIV Latin American Regional IAU Meeting (Eds. A. Mateus, J. Gregorio-Hetem & R. Cid Fernandes) Revista Mexicana de Astronomía y Astrofísica (Serie de Conferencias) Vol. 44, pp. 206-206 (2014) (Oct 2014)
4. "The Dark Energy Survey and operations: Year 1", Proceedings of the SPIE, Volume 9149, id. 91490V 15 pp. (2014) (Aug 2014)
5. "The Dark Energy Survey: Overview", American Astronomical Society, AAS Meeting #221, id.#335.01 (Jan 2013)
6. "Correlations Between Type Ia Supernovae and Their Host Galaxies Using the SDSS and Multi-wavelength Photometry", American Astronomical Society, AAS Meeting #221, id.#106.06 (Jan 2013)
7. "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)
8. "Dark Energy Spectrometer - A Proposed Multi-Fiber Instrument for the Blanco 4 Meter Telescope", American Astronomical Society, AAS Meeting #219, #422.09 (Jan 2012)
9. "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)
10. "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)

Past Visitors:

1. Aurélien Benoit-Lévy, University College London / Institut d'Astrophysique de Paris (2016)
2. Marcelle Soares-Santos, Fermilab (2016)
3. Keith Bechtol, WIPAC / University of Wisconsin-Madison (2015)
4. Chihway Chang, ETH Zurich (2015)
5. Steve Kahn, Stanford National Accelerator Laboratory (2014)
6. Brian Nord, Fermilab (2014)
7. Natalie Roe, LBNL (2014)
8. Florian Beutler, University of Western Australia (2012)
9. Felipe Marin, Swinburne University (2011)
10. Roberto Trotta, Imperial College London (2011)
11. Felipe Marin, Swinburne University (2010)
12. Tamara Davis, University of Queensland (2009)
13. Renee Hlozek, University of Oxford (2009)
14. Alexandra Abate, University College London (2008)
15. Manda Banerji, University College London (2008)
16. Alison Coil, University of California, San Diego (2008)
17. Tamara Davis, University of Queensland (2008)
18. Eanna Flanagan, Cornell University (2008)
19. Marcelo Gleiser, Dartmouth College (2008)
20. Ofer Lahav, University College London (2008)
21. Julie McEnery, NASA, Goddard Space Flight Center (2008)
22. Jean Quashnock, Carthage College (2007)
23. Mat Smith, University of Portsmouth (2007)
24. Joseph Zuntz, Imperial College, London (2007)
25. Anna Cabre Albos, Institut d'Estudis Espacials de Catalunya (2006)
26. David Cinabro, Wayne State University (2006)
27. Rogerio Rosenfeld, Instituto de Fisica Teorica-UNESP (2006)
28. Masao Sako, University of Pennsylvania (2006)
29. Brandon Allgood, University of California, Santa Cruz (2005)
30. Lifan Wang, Lawrence Berkeley National Laboratory (2005)
31. Alexander Conley, University of California, Berkeley (2004)
32. Masao Sako, Stanford University (2004)
33. Roman Scoccimarro, New York University (2004)
34. Andreas Berlind, New York University (2003)
35. Enrique Gaztanaga, Instituto Nacional de Astrofisica (2002)
36. Timothy McKay, University of Michigan (2002)
37. Erin Sheldon, University of Michigan (2002)