Hubert Bray
Professor of Mathematics
Professor Bray uses differential geometry to understand general relativity, and general relativity to motivate interesting problems in differential geometry. In 2001, he published his proof of the Riemannian Penrose Conjecture about the mass of black holes using geometric ideas related to minimal surfaces, scalar curvature, conformal geometry, geometric flows, and harmonic functions. He is also interested in the largescale unexplained curvature of the universe, otherwise known as dark matter, which makes up most of the mass of galaxies. Professor Bray has proposed geometric explanations for dark matter which he calls "wave dark matter," which motivate very interesting questions about geometric partial differential equations.
Professor Bray has supervised 8 math Ph.D. graduates at Duke from 2006 to 2017. He is currently supervising one math Ph.D. student and one physics Ph.D. student. His most recent Ph.D. graduate, Henri Roesch, proved a Null Penrose Conjecture, open since 1973, as his thesis. While the physical motivation about the mass of black holes is the same as for the Riemannian Penrose Conjecture, the geometry involved is almost unrecognizably different, and may be viewed as a fundamental result about null geometry.
Professor Bray has supervised 8 math Ph.D. graduates at Duke from 2006 to 2017. He is currently supervising one math Ph.D. student and one physics Ph.D. student. His most recent Ph.D. graduate, Henri Roesch, proved a Null Penrose Conjecture, open since 1973, as his thesis. While the physical motivation about the mass of black holes is the same as for the Riemannian Penrose Conjecture, the geometry involved is almost unrecognizably different, and may be viewed as a fundamental result about null geometry.
Office Hours
Mondays, 4:30  6:30 p.m.
Current Appointments & Affiliations
 Professor of Mathematics, Mathematics, Trinity College of Arts & Sciences 2004
 Professor in the Department of Physics, Physics, Trinity College of Arts & Sciences 2011
Contact Information
 189 Physics Bldg, Durham, NC 27710
 Box 90320, Durham, NC 277080320
 hubert.bray@duke.edu (919) 7578428
 Professor Bray's Main Webpage
 Background

Education, Training, & Certifications
 Ph.D., Stanford University 1997
 B.A., Rice University 1992
 Recognition

In the News

JUL 3, 2014 
MAR 17, 2014


Awards & Honors
 Community Service Award. Duke University’s Office of Durham and Regional Affairs. 2014
 Fellow of the AMS, Inaugural Class. The American Mathematical Society. January 2013
 Fellow. American Mathematical Society. 2013
 Sloan Research FellowshipMathematics. Alfred P. Sloan Foundation. 2001
 1997  1999: Mathematical Sciences Postdoctoral Research Fellowship. National Science Foundation. 1997
 Expertise

Subject Headings
 Research

Selected Grants
 Time Flat Curves and Surfaces, Geometric Flows, and the Penrose Conjecture awarded by National Science Foundation 2014  2018
 Scalar Curvature, the Penrose Conjecture, and the Axioms of General Relativity awarded by National Science Foundation 2010  2014
 Geometric Analysis Applied to General Relativity awarded by National Science Foundation 2007  2010
 Scalar Curvature, Geometric Flow, and the General Penrose Conjecture awarded by National Science Foundation 2005  2008
 Publications & Artistic Works

Selected Publications

Book Sections
 Bray, H. "On the Positive Mass, Penrose, and ZAS Inequalities in General Dimension." In Surveys in Geometric Analysis and Relativity in Honor of Richard Schoen’s 60th Birthday, edited by H Bray and W Minicozzi. Beijing and Boston: Higher Education Press and International Press, 2011. Link to Item
 Bray, H. "The Positve Energy Theorem and Other Inequalities." In The Encyclopedia of Mathematical Physics. 2005.
 Bray, H, and Chrusciel, PT. "The Penrose Inequality." In The Einstein Equations and the Large Scale Behavior of Gravitational Fields (50 Years of the Cauchy Problem in General Relativity), edited by PT Chrusciel and HF Friedrich. Birkhauser, 2004. Link to Item
 Bray, H, and Schoen, RM. "Recent Proofs of the Riemannian Penrose Conjecture." In Current Developments in Mathematics, 136. Somerville, MA: International Press, 1999.

Conference Papers
 Bray, HL, and Parry, AR. "Modeling wave dark matter in dwarf spheroidal galaxies." 2015. Full Text Link to Item
 Bray, HL. "A family of quasilocal mass functionals with monotone flows." January 1, 2006. Full Text
 Bray, H, and Morgan, F. "An isoperimetric comparison theorem for schwarzschild space and other manifolds." 2002. Full Text
 Bray, H. "Black Holes and the Penrose Inequality in General Relativity." International Congress of Mathematicians. Beijing, China. 2002. Link to Item

Journal Articles
 Bray, H, and Roesch, H. "Proof of a Null Geometry Penrose Conjecture." Notices of the American Mathematical Society. 65 (February 1, 2018).
 Bray, HL, Jauregui, JL, and Mars, M. "Time Flat Surfaces and the Monotonicity of the Spacetime Hawking Mass II." Annales Henri Poincaré 17, no. 6 (June 2016): 14571475. Full Text
 MartinezMedina, LA, Bray, HL, and Matos, T. "On wave dark matter in spiral and barred galaxies." Journal of Cosmology and Astroparticle Physics 2015, no. 12 (December 1, 2015): 025025. Full Text
 Bray, HL, and Jauregui, JL. "On curves with nonnegative torsion." Archiv der Mathematik 104, no. 6 (June 2015): 561575. Full Text
 Bray, HL, and Jauregui, JL. "Time Flat Surfaces and the Monotonicity of the Spacetime Hawking Mass." Communications in Mathematical Physics 335, no. 1 (April 2015): 285307. Full Text
 Bray, H, and Goetz, AS. "Wave Dark Matter and the TullyFisher Relation." (September 2014). Link to Item
 Bray, HL, and Jauregui, JL. "A geometric theory of zero area singularities in general relativity." Asian Journal of Mathematics 17, no. 3 (2013): 525560. Full Text
 Bray, HL. "On Dark Matter, Spiral Galaxies, and the Axioms of General Relativity (Accepted)." AMS Contemporary Mathematics Volume 599, no. Geometric Analysis, Mathematical Relativity, and Nonlinear Partial Differential Equations (2013). Link to Item
 Bray, H. "On Wave Dark Matter, Shells in Elliptical Galaxies, and the Axioms of General Relativity." (December 22, 2012). Link to Item
 Bray, HL, and Khuri, MA. "P. D. E. 'S which imply the penrose conjecture." Asian Journal of Mathematics 15, no. 4 (2011): 557610.
 Bray, H, Brendle, S, Eichmair, M, and Neves, A. "AreaMinimizing Projective Planes in 3Manifolds." Communications on Pure and Applied Mathematics 63, no. 9 (2010): 12371247. Full Text
 Bray, H, Brendle, S, and Neves, A. "Rigidity of areaminimizing twospheres in threemanifolds." Communications in Analysis and Geometry 18, no. 4 (2010): 821830.
 Bray, HL, and Khuri, MA. "A jang equation approach to the penrose inequality." Discrete and Continuous Dynamical Systems 27, no. 2 (2010): 741766. Full Text
 Bray, HL, and Lee, DA. "On the Riemannian Penrose inequality in dimensions less than eight." Duke Mathematical Journal 148, no. 1 (2009): 81106. Full Text
 Bray, H, and Miao, P. "On the capacity of surfaces in manifolds with nonnegative scalar curvature." Inventiones Mathematicae 172, no. 3 (2008): 459475. Full Text
 Bray, H, Hayward, S, Mars, M, and Simon, W. "Generalized inverse mean curvature flows in spacetime." Communications in Mathematical Physics 272, no. 1 (2007): 119138. Full Text
 Bray, HL, and Neves, A. "Classification of Prime 3Manifolds with Yamabe Invariant Greater than RP^3." Annals of Mathematics 159, no. 1 (January 2004): 407424. Link to Item
 Bray, H, and Finster, F. "Curvature estimates and the Positive Mass Theorem." Communications in Analysis and Geometry 10, no. 2 (2002): 291306.
 Bray, HL, and Iga, K. "Superharmonic Functions in R^n and the Penrose Inequality in General Relativity." Communications in Analysis and Geometry 10, no. 5 (2002): 9991016.
 Bray, HL. "Black Holes, Geometric Flows, and the Penrose Inequality in General Relativity." Notices of the American Mathematical Society 49, no. 11 (2002): 13721381. (Academic Article)
 Bray, HL. "Proof of the Riemannian Penrose inequality using the positive mass theorem." Journal of Differential Geometry 59, no. 2 (2001): 177267.
 Bray, H, McCormick, K, Jr, ROW, and Zhou, XD. "Wavelet variations on the Shannon sampling theorem." BioSystems 34, no. 13 (1995): 249257. Full Text

Theses and Dissertations
 Bray, H. The Penrose Inequality in General Relativity and Volume Comparison Theorems Involving Scalar Curvature. 1997. (PhD Thesis) Link to Item

 Teaching & Mentoring

Recent Courses
 MATH 89S: FirstYear Seminar 2018
 MATH 190S: Seminar on Special Topics in Mathematics 2018
 MATH 323S: Geometry 2018
 MATH 393: Research Independent Study 2018
 MATH 421: Differential Geometry 2018
 MATH 391: Independent Study 2017
 MATH 79090: Minicourse in Advanced Topics 2017
 MATH 69020: Topics in Differential Geometry 2016

Advising & Mentoring
 I have advised 8 graduate students so far, including Henri Roesch who received his Ph.D. in 2017. I am currently advising 1 physics graduate student and 2 advanced math undergraduate students.
 Scholarly, Clinical, & Service Activities

Presentations & Appearances
 Flatly Foliated Relativity: Gravity without Gravitational Waves. Geometry and Relativity Conference. Erwin Schroedinger Institute. August 2017 2017
 From Pythagoras to Einstein: The Geometry of Space and Time. 6th Annual Rockwell Lectures. University of Iowa. March 27, 2017 2017
 The Intersection of Geometry and Physics. 6th Annual Rockwell Lectures. University of Iowa. March 27, 2017 2017
 Geometric Aspects of Special and General Relativity. Invited Address, AMS Southeastern Sectional Meeting. American Mathematical Society. March 12, 2017 2017
 Flatly Foliated Relativity: Gravity without Gravitational Waves. Union College Math Conference, Special Session on Geometric Analysis. December 2, 2016  December 4, 2016 2016
 Part I: Flatly Foliated Relativity, Part II: The Null Penrose Conjecture. "Geometric Analysis and General Relativity" conference. Banff International Research Station. July 17, 2016  July 22, 2016 2016
 An Elliptic Theory of Gravity between Special and General Relativity. Research Seminar. Stanford University. May 13, 2016 2016
 Flatly Foliated Relativity: Gravity without Gravitational Waves. Geometry Seminar. University of California, Santa Cruz. May 11, 2016 2016
 On Wave Dark Matter and the Axioms of General Relativity. Colloquium . Mathematics Department, University of California, Santa Cruz. May 10, 2016 2016
 From Pythagoras to Einstein: The Geometry of Space and Time (General audience talk). Faculty of Mathematics Public Lectures : University of Waterloo. March 9, 2015 2015
 The Geometry of the Universe (Research Lecture) : University of Waterloo. March 9, 2015 2015
 The Science behind “Trevor the Time Traveler” (General audience talk). Faculty of Mathematics Public Lectures : University of Waterloo. March 9, 2015 2015
 Two lectures on the geometry of space and time (General audience talks). Faculty of Mathematics Public Lectures : University of Waterloo. March 9, 2015 2015
 The G. Milton Wing Lectures, Lecture 3: "Black Holes and the Monotonicity of the Hawking Mass for Time Flat Surfaces" (Research Style Talk). University of Rochester. April 25, 2014 2014
 The G. Milton Wing Lectures, Lecture 2: "On Dark Matter, Galaxies, and the Large Scale Geometry of the Universe" (Colloquium Style Talk). University of Rochester. April 24, 2014 2014
 The G. Milton Wing Lectures (Series of 3 Lectures, 1 General Public, 1 Colloquium Style, 1 Research Talk). April 23, 2014  April 25, 2014 2014
 The G. Milton Wing Lectures, Lecture 1: "From Pythagoras to Einstein: The Geometry of Space and Time" (Broad Audience Talk) : University of Rochester. April 23, 2014 2014
 The G. Milton Wing Lectures, Lecture 1: "From Pythagoras to Einstein: The Geometry of Space and Time". October 25, 2013 2013
 The G. Milton Wing Lectures, Lecture 2: "On Dark Matter, Galaxies, and the Large Scale Geometry of the Universe". October 25, 2013 2013
 The G. Milton Wing Lectures, Lecture 3: "Black Holes and the Monotonicity of the Hawking Mass for Time Flat Surfaces". October 25, 2013 2013
 The G. Milton Wing Lectures. October 25, 2013 2013
 On the Monotonicity of the Hawking Mass for Time Flat Surfaces (Research Talk). New York General Relativity Seminar. Columbia University. October 11, 2013 2013
 On Wave Dark Matter and the Geometry of Galaxies (Research Talk). JDG Conference. Lehigh University . May 24, 2013 2013
 On Dark Matter, Galaxies, and the Large Scale Geometry of the Universe (Research Talk). The 20th Southern California Geometric Analysis Seminar. UCSan Diego. February 24, 2013 2013
 On Dark Matter, Spiral Galaxies, and the Axioms of General Relativity (Research Talk). The 41st Barrett Memorial Lectures in Mathematical Relativity. University of Tennessee, Knoxville. May 12, 2011 2011
 On Dark Matter, Spiral Galaxies, and the Axioms of General Relativity (Research Talk). The 26th Annual Geometry Festival. University of Pennsylvania. April 15, 2011 2011
 From Pythagoras to Einstein: How Geometry Describes the LargeScale Structure of the Universe (Part 1) (Broad Audience Talk). Duke University Graduate Student Recruiting Weekend. Duke University. March 26, 2011 2011
 From Pythagoras to Einstein: How Geometry Describes the LargeScale Structure of the Universe (Part 2) (Broad Audience Talk). Duke University Graduate Student Recruiting Weekend. Duke University. March 26, 2011 2011
 From Black Holes and the Big Bang to Dark Energy and (maybe even) Dark Matter: Successes of Einstein's Theory of General Relativity (Broad Audience Talk) : 45 minutes. University of Tennessee. December 13, 2010 2010
 Dark Matter in Galaxies (Dark Matter Awareness Week talk) by Hubert Bray and Andriy Badin (Survey Talk). Dark Matter Awareness Week. Duke University. December 6, 2010 2010
 An Overview of General Relativity (Broad Audience Talk). Duke University Graduate/Faculty Seminar. Duke University. October 3, 2008 2008
 What Do Black Holes and Soap Bubbles Have in Common? (Broad Audience Talk). Duke University Graduate/Faculty Seminar. Duke University. September 21, 2007 2007
 Black Holes and the Curvature of Spacetime (Broad Audience Talk). Michigan State University. November 7, 2005 2005
 Negative Point Mass Singularities in General Relativity (Research Talk). Sir Isaac Newton Institute, Cambridge, England. August 2005 2005
 Black Holes, the Penrose Conjecture, and Quasilocal Mass (Research Talk). 50 Years of the Cauchy Problem in General Relativity. Cargese Summer School  Cargese, Corsica, France. August 2002 2002
 Generalization of the Hawking Mass (Research Talk). 50 Years of the Cauchy Problem in General Relativity. Cargese Summer School  Cargese, Corsica, France. August 2002 2002
 Proof of the Poincare Conjecture for 3Manifolds with Yamabe Invariant Greater than RP^3 (Research Talk). 50 Years of the Cauchy Problem in General Relativity. Cargese Summer School  Cargese, Corsica, France. August 2002 2002
 Black Holes, Minimal Surfaces, and Geometric Flows (Research Talk). Duke Math Journal Conference. Duke University. April 28, 2001 2001
 Quasilocal Mass and Black Holes in General Relativity (Research Talk) : Duke University . Geometry Seminar. April 28, 2001 2001
 Proof of the Riemannian Penrose Conjecture (Research Talk). Institute for Theoretical Physics  UC Santa Barbara. June 25, 1999 1999

Outreach & Engaged Scholarship
 Presenter to Harrison Do's 6th Grade Science Classes. Magellan Charter School. November 14, 2016 2016
 Presenter to Harrison Do's 6th Grade Science Classes. Magellan Charter School. November 3, 2015 2015
 Presenter to Harrison Do's 6th Grade Science Classes. Magellan Charter School. March 6, 2015 2015
 Math and Science Tutor, Organizer of Mathletes Program. Emily K Center. 2011  2016 2011  2016

Service to the Profession
 Organizer (with Otis Chodosh, Greg Galloway, and Pengzi Miao). Special Session in "Geometric Analysis and General Relativity" . American Mathematical Society. March 10, 2017  March 12, 2017 2017
 Organizer (with Andrew Cooper). AMS Special Session on Geometric Analysis. American Mathematical Society. November 8, 2014  November 9, 2014 2014
 Organizer (with Greg Galloway, Rafe Mazzeo, and Natasa Sesum). Park City Mathematics Institute Summer Program on Geometric Analysis. June 30, 2013  July 20, 2013 2013
 Organizer (with Mark Stern, Lenny Ng, Carla Cederbaum, Luca DiCerbo, and Chris Cornwell). 27th Annual Geometry Festival. April 27, 2012  April 29, 2012 2012
 Organizer and Presenter at Duke University (along with Andriy Badin). Dark Matter Awareness Week. December 6, 2010 2010
 Organizer (with Benoit Charbonneau, Dick Hain, and Patrick Eberlein). 23rd Annual Geometry Festival held at Duke University. April 25, 2008  April 27, 2008 2008
 Organizer (with Richard Schoen and Jim Isenberg). AIM / Stanford Relativity Workshop. 2002 2002
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