Theoretical
Astrophysics and Cosmology: 21-cm cosmology, formation of the first
stars and quasars, cosmic dawn and cosmic reionization, dark matter,
galaxy formation, large-scale structure, and gravitational lensing.
Conference Organization and International Activities:
Co-organizer of "Cosmological Signals from Cosmic
Dawn to the Present", Aspen Winter Conference on Astrophysics, Feb. 2018.
Principal organizer of "Cosmology and First Light", an international conference at the Institut D'Astrophysique de Paris (IAP), Dec. 2015
Member of SKA (Square Kilometre Array) Science Working Group on the Epoch of Reionization and Cosmic Dawn, 2014 - present
Member of International Ph.D. Board of Scuola Normale Superiore, Pisa, Italy, 2014-15
Principal organizer (and speaker): The 2010 Aspen Winter Astrophysics Conference
on "The High Redshift Universe: A Multi-Wavelength View", Feb. 7-12, 2010.
Organizer of the Astrophysics Sessions at the 54'th Annual Meeting
of the Israeli Physical Society, Ben-Gurion University, Dec. 28, 2008.
Member of Scientific Organizing Committee, 23'rd IAP (Paris) Colloquium
on "Far Away: Light in the young universe at redshift beyond 3",
Jul. 7-11, 2008.
Principal organizer
of the John Bahcall Physics Day at Tel Aviv University, Apr. 30, 2006.
Principal organizer (and speaker):
The 2006 Aspen Winter Astrophysics Conference on
"Cosmological Probes of Baryons and Dark Matter", Jan. 22-28, 2006.
Conference Participation:
Invited Speaker to "Post Planck Cosmology: Enigma,
Challenges and Visions", Pune, India, Oct. 2017
Invited Speaker to "Fundamental Physics with the
Square Kilometre Array", Mauritius, May 2017
SKA Science Team meeting (CD/EOR), Pisa,
Italy, Mar. 2017
"SKA 2016: Science for the SKA
Generation" (general conference + Key Science Project meeting), Goa,
India, Nov. 2016
Invited Speaker to "CMB Spectral Distortions from
Cosmic Baryon Evolution", Raman Research Institute, Bangalore, India, July 2016
Invited Speaker to "Cosmological Probes of
Fundamental Physics", Weizmann Institute of Science, Israel, June 2016
Invited Speaker to "Physics of Reionization and
the Cosmic Dawn in the SKA Era", Sexten Center for Astrophysics,
Sesto, Italy, Jan. 2016
"Cosmology and First Light", IAP, Paris, France, Dec. 2015
SKA CD/EoR Science Team
Workshop (invitation-only conference for developing the science team
for Cosmic Dawn / Epoch of Reionization measurements with the Square
Kilometre Array), Groningen, the Netherlands, Oct. 2015
The SKA Key Science Workshop (invitation-only conference for
developing
scientific plans for the Square Kilometre Array), Stockholm, Sweden, Aug. 2015
Invited Speaker to RESCEU APCosPA (Asia Pacific Organization for Cosmology and
Particle Astrophysics) Summer School on Cosmology and Particle
Astrophysics (Invited lecture series), Tokyo, Japan, Aug. 2015
"CosPA 2014: 11'th International Symposium on Cosmology & Particle
Astrophysics", Auckland, New Zealand, Dec. 2014
Invited Speaker to "CASCA (Canadian Astronomical Society) Annual
Meeting", Quebec City, Canada, June 2014
"CosPA 2013: 10'th International Symposium on Cosmology & Particle
Astrophysics", Hawaii, Nov. 2013
Invited Speaker to "Gamma Ray Bursts in the Era of Rapid Follow-up",
Liverpool, UK, June 2012
Invited Review at "CosmoBias: International Meeting on Physical Bias
in Cosmology", Marseille, France, May 2012
Invited Speaker to "Hydrogen Cosmology" workshop at Harvard, May 2011.
CITA@25/Bond@60: "The Theory of the Universe and Everything in It",
Toronto, Canada, May 2010.
"The High Redshift Universe: A Multi-Wavelength View", Aspen, U.S.A., 2010
Workshop: "Focus week on non-Gaussianities in the sky",
IPMU Tokyo, Japan, Apr. 2009.
Invited Speaker to Harvard University Conference on "21cm Cosmology",
May 2008.
"Cosmology with the CMB and LSS", School and workshop program, Tata
Institute of Fundamental Research, India (Invited lecture series; could
not attend), 2008.
Workshop on "Early universe and physics beyond the standard model",
Tokyo, Japan, Dec. 2007.
Invited Speaker to "HI Survival through Cosmic Times", Tuscany, Italy,
2007.
Invited Speaker to "From Planets to Galaxies", Budapest, Hungary, 2006.
"Cosmological Probes of Baryons and Dark Matter", Aspen, U.S.A., 2006
Reionizing the Universe, Groningen, The Netherlands, 2005.
KITP Workshop on "Galaxy-Intergalactic Medium Interactions",
Sep.-Oct. 2004.
The Large Scale Structure of Gas and Mass in the High Redshift Universe,
Technion, Israel, 2004.
Invited Speaker to the Oort Workshop on "CMB and first objects at the
end of the dark ages: observational consequences of reionization",
Holland, Apr. 2004.
Aspen Winter Conference on "The Large-Scale Distribution of Mass &
Light in the Universe", Jan. 2004.
ETH Zurich Conference on "Stars and Structure Formation: From
First Light to the Milky Way", Aug. 2003.
Invited speaker to Kloster Irsee Workshop on "The Formation and Early
Evolution of Galaxies", Germany, July 2003.
Jerusalem Workshop on "Galaxy Formation", June 2003.
Aspen Astrophysics Workshop on "The Baryonic Universe", Jan. 2003.
Elba International Workshop on "Early Cosmic Structures and the End of
the Dark Ages", Italy, June 2002.
Annual Meeting of the Israeli Physics Society, Dec. 2001.
Tsukuba International Workshop on ``The
Physics of Galaxy Formation'', Japan, July 2000.
Invited speaker to Harvard University Conference on "The First
Generation of Cosmic Structures", May 2000.
Boston University Conference on "Gravitational Lensing: Recent
Progress and Future Goals", July 1999.
Aspen Winter Astrophysics meeting on
"Cosmological Implications of the Local Group", Jan. 1999.
Graduate Education:
Massachusetts Institute of
Technology ,
9/1993 - 8/1997.
Ph. D. in Physics in June 1997. Dissertation:
"Gravitational Lensing as a Probe of Dark Matter, the Distance
Scale, and Gravitational Waves in the Universe".
Advisor: Prof. Edmund Bertschinger.
Karl Taylor Compton Fellowship from the M.I.T. Physics Dept., 9/1993 - 8/1995.
990/990 in Physics Subject GRE Exam, 990/990 in Mathematics Subject GRE Exam.
Undergraduate Education:
University of Pennsylvania
, 9/1990 - 5/1993.
Bachelor of Arts, May 1993.
Graduated Summa Cum Laude. Double major, with Honors in both Math and Physics.
W. Stevens Prize, "given to the most promising
graduating Physics Major at the University of Pennsylvania", May 1993.
Senior Thesis with Prof. Paul Steinhardt, on "Three-Point
Correlation Analysis of Periodicity in the
Distribution of Galaxies".
Teaching Assistant in Mathematical Analysis (a junior math course), Spring 1993.
Dean's Scholar of the School of Arts and Sciences.
Selected as a "Goldwater Scholar in Mathematics, Science and
Engineering" by the Barry M. Goldwater Scholarship and Excellence in
Education Foundation, Spring 1992.
Elected a member of Phi Beta Kappa, the academic honor society.
Non-Technical Reviews:
"The First Objects in the Universe", Rennan Barkana, Physics
World, 16(2), 25 (2003).
Publicly-released Computer Codes Based on the Above Publications:
Gemini, a toolkit for analytical models of inhomogeneous
structure formation. The code, based on "An Analytical Approach to
Inhomogeneous Structure Formation" (see Refereed Publications, above),
is available
here.
FASTELL, a code to calculate quickly and accurately
gravitational lensing due to a family of elliptical mass lens models.
The code, based on ``Fast Calculation of a Family of Elliptical Mass
Gravitational Lens Models'' (see Refereed Publications, above), is
available
here.
Personal Information:
Born in Haifa, Israel, in 1973.
Married to Riki and father to Or (Dec. 12'th, 2006) and Ariel (Oct. 7'th, 2009)
Citizen of the United States and Israel.
Hobbies: Playing violin (including Concertmaster of "The Campus - Ramat
HaSharon" orchestra), chess (USCF rating 1900), scuba diving (Adv. Open Water)
Publications:
"Signs of Dark Matter at 21-cm?", R. Barkana, N. J. Outmezguine, D. Redigolo, and T. Volansky, Physical Review D, submitted (2018)
"Large scale distribution of mass versus light from Baryon Acoustic Oscillations: Measurement in the final SDSS-III BOSS Data Release 12", M. T. Soumagnac, C. G. Sabiu, R. Barkana, J. Yoo, Monthly Notices of the Royal
Astronomical Society, submitted (2018)
"Constraining Baryon-Dark Matter Scattering with the Cosmic Dawn 21-cm Signal",
A. Fialkov, A. Cohen,
and R. Barkana, Physical Review
Letters, accepted (2018)
"Charting the Parameter Space of the 21-cm Power Spectrum", A. Cohen, A. Fialkov,
and R. Barkana, Monthly Notices of the Royal
Astronomical Society, accepted (2018)
"SARAS 2 Constraints on Global 21 cm Signals from the Epoch of Reionization",
S. Singh, et al., The Astrophysical Journal,, 858, 54 (2018)
"Possible interaction between baryons and dark-matter particles revealed by the first stars", R. Barkana, Nature , 555, 71 (2018)
"Charting the parameter space of the global 21-cm signal", A. Cohen, A. Fialkov,
R. Barkana, and M. Lotem, Monthly Notices of the Royal
Astronomical Society, 472, 1915 (2017).
"First Results on the Epoch of Reionization from First Light with SARAS 2",
S. Singh, et al., The Astrophysical Journal, 845, 12 (2017).
"Constraining the redshifted 21-cm signal with the unresolved soft X-ray background",
A. Fialkov, A. Cohen, R. Barkana, and J. Silk, Monthly Notices of the Royal
Astronomical Society, 464, 3498 (2017).
"The rise of the first stars: Supersonic streaming, radiative feedback, and 21-cm
cosmology", R. Barkana, Physics Reports, 645, 1 (2016).
"The 21-cm BAO signature of enriched low-mass galaxies during cosmic reionization",
A. Cohen, A. Fialkov, and R. Barkana, Monthly Notices of the Royal
Astronomical Society, 459, 90 (2016).
"Large-Scale Distribution of Total Mass versus Luminous Matter
from Baryon Acoustic Oscillations: First Search in the Sloan Digital
Sky Survey III Baryon Oscillation Spectroscopic Survey Data Release
10", M. T. Soumagnac, R. Barkana, C. G. Sabiu, A. Loeb, A. J. Ross,
F. B. Abdalla, S. T. Balan, and O. Lahav, Physical Review
Letters, 116, 201302 (2016).
"The Cosmic Dawn and Epoch of
Reionisation with SKA", L. Koopmans, J. Pritchard, G. Mellema,
J. Aguirre, K. Ahn, R. Barkana, et al., Proceedings of Advancing
Astrophysics with the Square Kilometre Array [AASKA14] (2015).
"Reconstructing the nature of the first cosmic sources from the
anisotropic 21-cm signal", A. Fialkov, R. Barkana, and
A. Cohen,
Physical Review Letters, 114, 101303 (2015).
"The rich complexity of 21-cm fluctuations produced by the first stars",
A. Fialkov and R. Barkana,
Monthly Notices of the Royal Astronomical
Society, 445, 213 (2014).
"High-redshift star formation in a time-dependent
Lyman-Werner background", E. Visbal, Z. Haiman, B. Terrazas,
G. L. Bryan, and R. Barkana, Monthly Notices of the Royal
Astronomical Society, 445, 107 (2014).
"The observable signature of late heating of the Universe
during cosmic reionization",
A. Fialkov, R. Barkana, and E. Visbal,
Nature, 506, 197 (2014).
"Complete history of the
observable 21 cm signal from the first stars during the pre-reionization era",
A. Fialkov, R. Barkana,
A. Pinhas, and E. Visbal,
Monthly Notices of the Royal Astronomical
Society, 437, 36 (2014).
"The 21-cm signature of the first
stars during the Lyman-Werner feedback era", A. Fialkov, R. Barkana,
E. Visbal, D. Tseliakhovich, and C. Hirata,
Monthly Notices of the Royal Astronomical
Society, 432, 2909 (2013).
"Luminosity Bias. II.
The Cosmic Web of the First Stars", R. Barkana,
Publications of the Astronomical Society of Australia
, 30, 36 (2013).
"Studying cosmic reionization with observations of the global 21-cm
signal", A. Morandi and R. Barkana, Monthly Notices of the
Royal Astronomical Society, 424, 2551 (2012).
"Impact of the relative motion
between the dark matter and baryons on the first stars: semi-analytical
modelling", A. Fialkov, R. Barkana,
D. Tseliakhovich, and C. Hirata,
Monthly Notices of the Royal Astronomical
Society, 424, 1335 (2012).
"The signature of the first stars in
atomic hydrogen at redshift 20", E. Visbal, R. Barkana, A. Fialkov,
D. Tseliakhovich, and C. Hirata,
Nature,
487, 70 (2012).
"Profiles of Dark Matter Velocity
Anisotropy in Simulated Clusters", D. Lemze, R. Wagner, Y. Rephaeli,
S. Sadeh, M. Norman, R. Barkana,
T. Broadhurst, H. Ford, and M. Postman,
The Astrophysical Journal, 752, 141 (2012).
"Suppression and Spatial Variation of Early Galaxies and Minihalos",
D. Tseliakhovich, R. Barkana, and C. Hirata, Monthly
Notices of the Royal Astronomical Society, 418, 906 (2011).
"Triaxiality and non-thermal gas pressure in Abell 1689", A.
Morandi, M. Limousin, Y. Rephaeli, K. Umetsu, R.
Barkana, T. Broadhurst, and H. Dahle, Monthly Notices of the
Royal Astronomical Society, 416, 2567 (2011).
"The nonlinear evolution of baryonic overdensities in the early
universe: Initial conditions of numerical simulations", S. Naoz,
N. Yoshida, and R. Barkana, Monthly Notices of the Royal
Astronomical Society, 416, 232 (2011).
"Scale-Dependent Bias of Galaxies from Baryonic Acoustic
Oscillations", R. Barkana and A. Loeb, Monthly Notices of the
Royal Astronomical Society, 415, 3113 (2011).
"Quantifying the collisionless nature of dark matter and galaxies
in A1689", D. Lemze, Y. Rephaeli, R. Barkana, T.
Broadhurst, R. Wagner, and M. Norman, The Astrophysical Journal,
728, 40 (2011).
"Strong-Lensing Analysis of a Complete Sample of 12 MACS Clusters
at z>0.5: Mass Models and Einstein Radii", A. Zitrin, T.
Broadhurst, R. Barkana, Y. Rephaeli, and N. Benitez,
Monthly Notices of the Royal Astronomical Society, 410, 1939 (2011).
"Statistics of 21-cm fluctuations in cosmic reionization
simulations: PDFs and difference PDFs", V. Gluscevic and R.
Barkana, Monthly Notices of the Royal Astronomical Society, 408, 2373
(2010).
"Measuring the History of Cosmic Reionization using the 21-cm PDF
from Simulations", K. Ichikawa, R. Barkana, I. Iiev,
G. Mellema, and P. Shapiro, Monthly Notices of the Royal
Astronomical Society, 406, 2521 (2010).
"Concentrating the Dark Matter in Galaxy Clusters through Tidal
Stripping of Baryonically-Compressed Galactic Halos", R. Barkana
and A. Loeb, Monthly Notices of the Royal Astronomical
Society, 405, 1969 (2010).
"Gas in Simulations of High Redshift Galaxies and Minihalos",
S. Naoz, R. Barkana, and A. Mesinger, Monthly Notices
of the Royal Astronomical Society, 399, 369 (2009).
"Dynamical Study of A1689 from Wide-Field VLT/VIMOS Spectroscopy:
Mass Profile, Concentration Parameter, and Velocity Anisotropy",
D. Lemze, T. Broadhurst, Y. Rephaeli, R. Barkana, and
K. Umetsu, The Astrophysical Journal, 701, 1336 (2009).
"Studying the sources of cosmic reionization with 21-cm
fluctuations", R. Barkana, Monthly Notices of the Royal
Astronomical Society, 397, 1454 (2009).
"The Infancy of Cosmic Reionization", R. Barkana, Monthly
Notices of the Royal Astronomical Society, 391, 727 (2008).
"Large Einstein Radii: A Problem for ΛCDM",
T. Broadhurst and R. Barkana,
Monthly Notices of the Royal Astronomical Society,
390, 1647 (2008).
"Mass and Gas Profiles in A1689: Joint X-ray and Lensing Analysis",
D. Lemze, R. Barkana, T. Broadhurst, and Y. Rephaeli,
Monthly Notices of the Royal Astronomical Society,
386, 1092 (2008).
"Detecting Early Galaxies Through Their
21-cm Signature", S. Naoz and R. Barkana,
Monthly Notices of the Royal Astronomical
Society Letters, 385, 63 (2008).
"The Difference PDF of 21-cm Fluctuations: A Powerful Statistical
Tool for Probing Cosmic Reionization", R.
Barkana and A. Loeb, Monthly Notices of the Royal Astronomical
Society, 384, 1069 (2008).
"The Formation and Gas Content of High Redshift Galaxies and
Minihalos", S. Naoz and R. Barkana,
Monthly Notices of the Royal Astronomical
Society, 377, 667 (2007).
"The Physics and Early History of the Intergalactic Medium", R.
Barkana and A. Loeb, Reports on Progress in Physics , 70,
627 (2007).
"On Correlated Random Walks and 21-cm Fluctuations
During Cosmic Reionization", R. Barkana, Monthly Notices of
the Royal Astronomical Society, 376, 1784 (2007).
"The First Stars in the Universe", S. Naoz, S. Noter, and
R. Barkana, Monthly Notices of the Royal Astronomical
Society Letters, 373, 98 (2006).
"Separating out the Alcock-Paczynski Effect on 21cm Fluctuations",
R. Barkana, Monthly Notices of the Royal Astronomical Society,
372, 259 (2006).
"Light-Cone Anisotropy in 21-cm Fluctuations during the Epoch of
Reionization", R. Barkana and A. Loeb, Monthly Notices of
the Royal Astronomical Society, 372, 43 (2006).
"Detecting Reionization in the Star Formation Histories of
High-Redshift Galaxies", R. Barkana and A. Loeb, Monthly
Notices of the Royal Astronomical Society, 371, 395 (2006).
"The First Stars in the Universe and Cosmic Reionization", R. Barkana,
Science , 313, 931 (2006).
"A Cosmic Relation between Extinction and Star Formation", O. Zoran,
R. Barkana, and R. I. Thompson, Monthly Notices of the Royal
Astronomical Society Letters, 368, 47 (2006).
"Probing the Epoch of Early Baryonic Infall Through 21-cm
Fluctuations", R. Barkana and A. Loeb, Monthly Notices of the
Royal Astronomical Society Letters, 363, 36 (2005).
"Growth of Linear Perturbations before the Era of the First Galaxies",
S. Naoz and R. Barkana, Monthly Notices of the Royal
Astronomical Society, 362, 1047 (2005).
"Detecting the Earliest Galaxies Through
Two New Sources of 21cm Fluctuations", R. Barkana and A. Loeb,
The Astrophysical Journal , 626, 1 (2005).
"A Method for Separating the Physics from the
Astrophysics of
High-Redshift 21cm Fluctuations", R. Barkana and A. Loeb,
The Astrophysical Journal Letters, 624, 65 (2005).
"Was the Universe Reionized at Redshift 10?", A. Loeb,
R. Barkana, and L. Hernquist, The Astrophysical Journal
, 620, 553 (2005).
"Unusually Large Fluctuations in the Statistics of Galaxy
Formation at High Redshift", R. Barkana and A. Loeb,
The Astrophysical Journal , 609, 474 (2004).
"GRBs versus Quasars: Lyman-alpha Signatures of Reionization
versus Cosmological Infall", R. Barkana and A. Loeb,
The Astrophysical Journal , 601, 64 (2004).
"A Model For Infall Around Virialized Halos",
R. Barkana, Monthly Notices of the Royal Astronomical
Society , 347, 59 (2004).
"Spectral Signature of Cosmological Infall Around the First Quasars",
R. Barkana and A. Loeb, Nature 421, 341 (2003).
"Effective Screening due to Minihalos during the Epoch of Reionization",
R. Barkana and A. Loeb, The Astrophysical Journal
578, 1 (2002).
"The Star Formation Rate Intensity Distribution Function -- Comparison
of Observations with Hierarchical Galaxy Formation", R. Barkana,
New Astronomy 7, 337 (2002).
"An Analytical Approach to Inhomogeneous
Structure Formation", E. Scannapieco and R. Barkana,
The Astrophysical Journal 571, 585 (2002).
"Did the Universe Reionize at Redshift Six?", R. Barkana,
New Astronomy 7, 85 (2002).
"Constraints on Warm Dark Matter from Cosmological Reionization", R.
Barkana, Z. Haiman and J. Ostriker, The
Astrophysical Journal 558, 482 (2001).
"The Reionization of the Universe by the First Stars and Quasars",
A. Loeb and R. Barkana,
Annual Reviews of Astronomy and Astrophysics , 39, 19 (2001).
"In the Beginning: The First Sources of Light and the Reionization of
the Universe", R. Barkana and A. Loeb, Physics
Reports 349, 125 (2001) [also available
here] .
"Fuzzy Cold Dark Matter: The Wave Properties of Ultralight
Particles", W. Hu, R. Barkana and A. Gruzinov,
Physical Review Letters 85, 1158 (2000).
"Identifying the Reionization Redshift from the Cosmic Star Formation Rate",
R. Barkana and A. Loeb, The Astrophysical Journal 539, 20
(2000).
"High-Redshift Galaxies: Their Predicted
Size and Surface Brightness Distributions and Their Gravitational
Lensing Probability",
R. Barkana and A. Loeb, The Astrophysical Journal 531, 613 (2000).
"The Photo-Evaporation of Dwarf Galaxies During Reionization",
R. Barkana and A. Loeb, The Astrophysical Journal 523, 54 (1999).
"A Reassessment of the Data and Models of the Gravitational
Lens Q0957+561", R. Barkana, J. Lehar, E. Falco,
N. Grogin, C. Keeton, and I. Shapiro,
The Astrophysical Journal 520, 479 (1999).
"A Possible Gravitational Lens in the Hubble Deep Field South",
R. Barkana, R. Blandford, and D. Hogg,
The Astrophysical Journal Letters 513, 91 (1999).
"Fast Calculation of a Family of Elliptical Mass Gravitational
Lens Models", R. Barkana, The Astrophysical Journal 502, 531 (1998).
"Analysis of Time Delays in the Gravitational Lens
PG 1115+080", R. Barkana, The Astrophysical Journal 489, 21 (1997).
"Limits on a Stochastic Background of Gravitational Waves
from Gravitational Lensing", R. Bar-Kana, Physical Review D ,
54, 7138 (1996).
"Effect of Large-Scale Structure on Multiply Imaged Sources",
R. Bar-Kana, The Astrophysical Journal , 468, 17 (1996).
"Limits on Direct Detection of Gravitational Waves",
R. Bar-Kana, Physical Review D , 50, 1157 (1994).