Question: Which institute is this Indian theoretical physicist who contributed to studies of S-branes a visiting professor at?

full_context: Document 1: S-brane: In string theory, an S-brane is a hypothetical and controversial counterpart of a D-brane, which, unlike a D-brane, is localized in time. Depending on the context the "S" stands for "Strominger", "Sen", or "Space-like". The S-brane was originally proposed by Andrew Strominger in his speculative paper with Michael Gutperle, and another version of S-branes was studied by Ashoke Sen. They are thought to be extended in the space-like/temporal directions only, so that they exist at only one point in time, but are otherwise analogous to p-branes.
Document 2: Cosmic string: Cosmic strings are hypothetical 1-dimensional topological defects which may have formed during a symmetry breaking phase transition in the early universe when the topology of the vacuum manifold associated to this symmetry breaking was not simply connected. It is expected that at least one string per Hubble volume is formed. Their existence was first contemplated by the theoretical physicist Tom Kibble in the 1970s.
Document 3: Shiraz Minwalla: Shiraz Naval Minwalla is an Indian theoretical physicist and string theorist. He is a faculty member in the Department of Theoretical Physics at Tata Institute of Fundamental Research, Mumbai. Prior to his present position, he was a Harvard Junior Fellow and subsequently an Assistant Professor at Harvard University.
Document 4: SASTRA Ramanujan Prize: The SASTRA Ramanujan Prize, founded by Shanmugha Arts, Science, Technology & Research Academy (SASTRA) University in Kumbakonam, India, Srinivasa Ramanujan's hometown, is awarded every year to a young mathematician judged to have done outstanding work in Ramanujan's fields of interest. The age limit for the prize has been set at 32 (the age at which Ramanujan died), and the current award is $10,000.
Document 5: Spenta R. Wadia: Spenta R. Wadia is an Indian theoretical physicist working in string theory and quantum field theory. He is currently a Distinguished Professor at Tata Institute of Fundamental Research, Mumbai and the first Director of the International Centre for Theoretical Sciences (ICTS). He is a recipient of the 2004 TWAS Prize in Physics.
Document 6: DS/CFT correspondence: In string theory, the dS/CFT correspondence is a de Sitter space analogue of the AdS/CFT correspondence, proposed originally by Andrew Strominger. In this correspondence, the conjectured CFT boundary is in the future, and time is the emergent dimension.
Document 7: Ashoke Sen: Ashoke Sen, FRS ( ; Bengali: অশোক সেন ; born 1956) is an Indian theoretical physicist and distinguished professor at the Harish-Chandra Research Institute, Allahabad. He also is the Morningstar Visiting professor at MIT and a distinguished professor at the Korea Institute for Advanced Study. His main area of work is String Theory. He was among the first recipients of the Fundamental Physics Prize “for opening the path to the realisation that all string theories are different limits of the same underlying theory”. Of the prizes for theoretical physics, the Fundamental Physics Prize is the one which pays the most prize money.
Document 8: Type 0 string theory: The Type 0 string theory is a less well-known model of string theory. It is a superstring theory in the sense that the worldsheet theory is supersymmetric. However, the spacetime spectrum is not supersymmetric and, in fact, does not contain any fermions at all. In dimensions greater than two, the ground state is a tachyon so the theory is unstable. These properties make it similar to the bosonic string and an unsuitable proposal for describing the world as we observe it, although a GSO projection does get rid of the tachyon and the even G-parity sector of the theory defines a stable string theory. The theory is used sometimes as a toy model for exploring concepts in string theory, notably closed string tachyon condensation. Some other recent interest has involved the two-dimensional Type 0 string which has a non-perturbatively stable matrix model description.
Document 9: Maxim Kontsevich: Maxim Lvovich Kontsevich (Russian: Макси́м Льво́вич Конце́вич ;   ; born 25 August 1964) is a Russian and French mathematician. He is a professor at the Institut des Hautes Études Scientifiques and a distinguished professor at the University of Miami. He received the Henri Poincaré Prize in 1997, the Fields Medal in 1998, the Crafoord Prize in 2008, the Shaw Prize and Fundamental Physics Prize in 2012, and the Breakthrough Prize in Mathematics in 2014.
Document 10: Breakthrough Prize in Fundamental Physics: The Fundamental Physics Prize is awarded by the Fundamental Physics Prize Foundation, a not-for-profit organization dedicated to awarding physicists involved in fundamental research which was founded in July 2012 by Russian physicist and internet entrepreneur Yuri Milner.
Document 11: Dirac string: In physics, a Dirac string is a hypothetical one-dimensional curve in space, conceived of by the physicist Paul Dirac, stretching between two Dirac magnetic monopoles with opposite magnetic charges, or from one magnetic monopole out to infinity. The gauge potential cannot be defined on the Dirac string, but it is defined everywhere else. The Dirac string acts as the solenoid in the Aharonov–Bohm effect, and the requirement that the position of the Dirac string should not be observable implies the Dirac quantization rule: the product of a magnetic charge and an electric charge must always be an integer multiple of formula_1. Also, a change of position of a Dirac string corresponds to a gauge transformation. This shows that Dirac strings are not gauge invariant, which is consistent with the fact that they are not observable.
Document 12: David Gross: David Jonathan Gross ( ; born February 19, 1941) is an American theoretical physicist and string theorist. Along with Frank Wilczek and David Politzer, he was awarded the 2004 Nobel Prize in Physics for their discovery of asymptotic freedom. David Gross is the Chancellor’s Chair Professor of Theoretical Physics at the Kavli Institute for Theoretical Physics of the University of California, Santa Barbara, and was formerly the KITP director and holder of their Frederick W. Gluck Chair in Theoretical Physics . He is also a faculty member in the UC Santa Barbara Physics Department and is currently affiliated with the Institute for Quantum Studies at Chapman University in California. He is a foreign member of the Chinese Academy of Sciences.
Document 13: Andrew Strominger: Andrew Eben Strominger ( ; born 1955) is an American theoretical physicist who is the Director of Harvard's Center for the Fundamental Laws of Nature. He has made significant contributions to quantum gravity and string theory. These include his work on Calabi-Yau compactification and topology change in string theory, and on the stringy origin of black hole entropy. He is a senior fellow at the Society of Fellows, and is the Gwill E. York Professor of Physics.
Document 14: SYZ conjecture: The SYZ conjecture is an attempt to understand the mirror symmetry conjecture, an issue in theoretical physics and mathematics. The original conjecture was proposed in a paper by Strominger, Yau, and Zaslow, entitled "Mirror Symmetry is "T"-duality".
Document 15: Matrix string theory: In physics, matrix string theory is a set of equations that describe superstring theory in a non-perturbative framework. Type IIA string theory can be shown to be equivalent to a maximally supersymmetric two-dimensional gauge theory, the gauge group of which is U("N") for a large value of "N". This matrix string theory was first proposed by Luboš Motl in 1997 and later independently in a more complete paper by Robbert Dijkgraaf, Erik Verlinde, and Herman Verlinde. Another matrix string theory equivalent to Type IIB string theory was constructed in 1996 by Ishibashi, Kawai, Kitazawa and Tsuchiya. This version is known as the IKKT matrix model.
ground_truth: MIT