Question: What year was the original proposer of the dS/CFT correspondence of string theory born?

full_context: Document 1: 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 2: Steven Gubser: Steven Scott Gubser (born 4 May 1972) is a professor of physics at Princeton University. His research focuses on theoretical particle physics, especially string theory, and the AdS/CFT correspondence. He is a widely cited scholar in these and other related areas.
Document 3: Matthew Kleban: Matthew Benjamin Kleban is an American theoretical physicist who works on string theory and theoretical cosmology. He is an associate professor at New York University, a member of the Center for Cosmology and Particle Physics, and a former member at the Institute for Advanced Study. His contributions to physics include:
Document 4: 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 5: Kerr/CFT correspondence: The Kerr/CFT correspondence is an extension of the AdS/CFT correspondence or gauge-gravity duality to rotating black holes (which are described by the Kerr metric).
Document 6: AdS/CMT correspondence: In theoretical physics, AdS/CMT correspondence is the program to apply string theory to condensed matter theory using the AdS/CFT correspondence.
Document 7: 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 8: Eric Zaslow: Eric Zaslow is an American mathematical physicist at Northwestern University. He attended Harvard for his Ph.D in Physics. His research focuses on mathematical questions arising from duality symmetries in theoretical physics such as mirror symmetry. With Andrew Strominger and Shing-Tung Yau, he formulated the SYZ conjecture.
Document 9: 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 10: Eva Silverstein: Eva Silverstein (born October 24, 1970) is an American physicist and string theorist. She is best known for her work on tachyon condensation in string theory and resulting resolution of some spacetime singularities (with Adams, Polchinski, and others). Her other significant research contributions include the construction of the first models of dark energy in string theory, some basic extensions of the AdS/CFT correspondence to more realistic field theories (with Kachru), and the discovery of a predictive new mechanism for cosmic inflation involving D-brane dynamics (with Tong and Alishahiha).
Document 11: Topological string theory: In theoretical physics, topological string theory is a version of string theory. Topological string theory was established and is studied by physicists such as Edward Witten and Cumrun Vafa.
Document 12: 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.
Document 13: Lisa Randall: Lisa Randall (born June 18, 1962) is an American theoretical physicist working in particle physics and cosmology. She is the Frank B. Baird, Jr. Professor of Science on the physics faculty of Harvard University. Her research includes elementary particles, fundamental forces and extra dimensions of space. She studies the Standard Model, supersymmetry, possible solutions to the hierarchy problem concerning the relative weakness of gravity, cosmology of extra dimensions, baryogenesis, cosmological inflation, and dark matter. She contributed to the Randall–Sundrum model, first published in 1999 with Raman Sundrum.
Document 14: Stephen Hawking: Stephen William Hawking, {'1': ", '2': ", '3': ", '4': "} ( born 8 January 1942) is an English theoretical physicist, cosmologist, author and Director of Research at the Centre for Theoretical Cosmology within the University of Cambridge. His scientific works include a collaboration with Roger Penrose on gravitational singularity theorems in the framework of general relativity and the theoretical prediction that black holes emit radiation, often called Hawking radiation. Hawking was the first to set out a theory of cosmology explained by a union of the general theory of relativity and quantum mechanics. He is a vigorous supporter of the many-worlds interpretation of quantum mechanics.
Document 15: Brian Greene: Brian Randolph Greene (born February 9, 1963) is an American theoretical physicist, mathematician, and string theorist. He has been a professor at Columbia University since 1996 and chairman of the World Science Festival since co-founding it in 2008. Greene has worked on mirror symmetry, relating two different Calabi–Yau manifolds (concretely, relating the conifold to one of its orbifolds). He also described the flop transition, a mild form of topology change, showing that topology in string theory can change at the conifold point.
ground_truth: 1955