{{Short description|Indian physicist}} {{Infobox scientist | name = Samir D. Mathur | image = Samir Mathur.png | caption = Prof. Samir Mathur | birth_name = Samir Dayal Mathur | birth_place = Karur, Tamil Nadu, India | workplaces = Ohio State University<br/>MIT | alma_mater = IIT Kanpur (M.S., 1981)<br/>TIFR (Ph.D., 1987) | doctoral_advisor = | doctoral_students = | fields = Physics | known_for = Fuzzball (string theory)<br/> Contributions to:<br/> String Theory<br/>AdS/CFT<br/>Black hole information paradox | prizes = }} '''Samir Dayal Mathur''' is a theoretical physicist who specializes in string theory and black hole physics. ==Career== ===Teaching=== Mathur is a professor in the Department of Physics at Ohio State University<!--Wikipedians do not use "The" as part of Ohio State's name; it is considered a marketing gimmick, and routinely deleted.--> and a member of the University's High Energy Theory Group. He was a faculty member at Massachusetts Institute of Technology from 1991–99 and held postdoctoral positions at Harvard University and the Tata Institute of Fundamental Research.<ref name=OhioStateFaculty>{{Cite journal|url=https://physics.osu.edu/people/mathur|title=Faculty information sheet|publisher=The Ohio State University|access-date=2015-03-29|archive-url=https://archive.today/20150404112037/https://physics.osu.edu/people/mathur|archive-date=2015-04-04}}</ref> ===Research=== Mathur's research is focused on string theory, black holes, the AdS/CFT correspondence, and cosmology. He is best known for developing the Fuzzball conjecture as a resolution of the black hole information paradox. The Fuzzball conjecture asserts that the fundamental description of black holes is given by a quantum bound state of matter which has the same size as the corresponding classical black hole.<ref>{{cite journal|author=Samir D. Mathur|title=The Fuzzball proposal for black holes: An Elementary review|arxiv= hep-th/0502050|journal=Fortschr. Phys.|volume=53 | year = 2005 |issue=7–8 |pages=793–827 |doi=10.1002/prop.200410203|bibcode=2005ForPh..53..793M|s2cid=15083147 }}</ref> This quantum bound state replaces the event horizon and singularity, and the classical black hole metric is claimed to be an approximate effective description.<ref>{{cite journal|author=Samir D. Mathur|title=Black Holes and Beyond|arxiv= 1205.0776|journal=Annals of Physics |volume=327 |year=2012 |issue=11 |page=2760 |doi=10.1016/j.aop.2012.05.001|bibcode=2012AnPhy.327.2760M|s2cid=119198601 }}</ref>
In 2009 Mathur published a strong version of the black hole information paradox, strengthening Stephen Hawking's original version by demonstrating that small local corrections to Hawking's semiclassical analysis cannot restore unitarity.<ref name="0909.1038">{{cite journal|author=Samir D. Mathur|title=The Information paradox: A Pedagogical introduction|arxiv=0909.1038 |journal=Class. Quantum Grav.|volume=26 | year = 2009 |issue=22 |article-number=224001|doi=10.1088/0264-9381/26/22/224001|bibcode=2009CQGra..26v4001M|s2cid=18878424 }}</ref> This result was obtained by applying Strong Subadditivity of Quantum Entropy to the evaporation of Hawking radiation.<ref name="0909.1038"/> This led to a renewed interest in the information paradox and the development of the 2012 black hole firewall paradox.<ref>Jennifer Ouellette, "The Fuzzball Fix for a Black Hole Paradox", Quanta magazine, June 23, 2015. https://www.quantamagazine.org/how-fuzzballs-solve-the-black-hole-firewall-paradox-20150623/</ref><ref>{{cite journal | author = Chowdhury Borun D., Puhm Andrea | title = Decoherence and the fate of an infalling wave packet: Is Alice burning or fuzzing? | journal = Phys. Rev. D | year = 2013 | volume = 88 | issue = 6 | article-number = 063509 | doi = 10.1103/PhysRevD.88.063509 | arxiv = 1208.2026| bibcode = 2013PhRvD..88f3509C| s2cid = 3104184 }}</ref><ref>{{cite journal | author = Burrington Benjamin A., Peet Amanda W., Zadeh Ida G. | title = Operator mixing for string states in the D1-D5 CFT near the orbifold point | journal = Phys. Rev. D | year = 2013 | volume = 87 | issue = 10 | article-number = 106001 | doi = 10.1103/PhysRevD.87.106001 | arxiv = 1211.6699| bibcode = 2013PhRvD..87j6001B| s2cid = 119277282 }}</ref>
==References== {{Reflist}}
==External links== {{wikiquote}} * [https://www.physics.ohio-state.edu/~mathur/ Mathur's web page at The Ohio State University] * [http://inspirehep.net/search?p=samir+d+mathur List of Publications on INSPIRE-HEP] * [https://web.archive.org/web/20040318070818/http://researchnews.osu.edu/archive/fuzzball.htm Information paradox solved? If so, Black Holes are "Fuzzballs"] — by The Ohio State University * [https://www.youtube.com/watch?v=oHz0QPNJxaE KITP Seminar: The Black Hole Story in 4 Steps | Samir Mathur]
{{authority control}}
{{DEFAULTSORT:Mathur, Samir D.}} Category:Living people Category:20th-century Indian physicists Category:Ohio State University faculty Category:Indian string theorists Category:Year of birth missing (living people) Category:MIT Center for Theoretical Physics faculty