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Covariant quantization of string theories is developed in the context of conformal field theory and the BRST quantization procedure. The BRST method is used to covariantly quantize superstrings, and in particular to construct the vertex operators for string emission as well as the supersymmetry charge. The calculation of string loop diagrams is sketched. We… (More)

- T Banks, W Fischler, S H Shenker, L Susskind
- 2008

We suggest and motivate a precise equivalence between uncompactified eleven dimensional M-theory and the N = ∞ limit of the supersymmetric matrix quantum mechanics describing D0 branes. The evidence for the conjecture consists of several correspondences between the two theories. As a consequence of supersymmetry the simple matrix model is rich enough to… (More)

- Daniei Friedan, Stephen Shenker
- 2002

The quantem theory of c~osed bosonic strings is formuNted as integrabie anMytic geometry on the universM moduli space of Riemann surfaces. Solztions of the equalion of motion of quantum strings are flat hermifian metrics in hoio-morphic vector bundles ever universal moduti space. In this 1otter we formulate quantum string theory as integrabie analytic… (More)

We study the behavior of D-branes at distances far shorter than the string length scale l s. We argue that short-distance phenomena are described by the IR behavior of the D-brane world-volume quantum theory. This description is valid until the brane motion becomes relativistic. At weak string coupling g s this corresponds to momenta and energies far above… (More)

We study the physics of the Seiberg-Witten and Argyres-Faraggi-Klemm-Lerche-Theisen-Yankielowicz solutions of D = 4, N = 2 and N = 1 SU (N) supersymmetric gauge theory. The N = 1 theory is confining and its effective Lagrangian is a spontaneously broken U (1) N−1 abelian gauge theory. We identify some features of its physics which see this internal… (More)

- Tom Banks, Stephen Shenker
- 1996

Various aspects of branes in the recently proposed matrix model for M theory are discussed. A careful analysis of the supersymmetry algebra of the matrix model uncovers some central charges which can be activated only in the large N limit. We identify the states with non

- Mauro Brigante, Hong Liu, Robert C Myers, Stephen Shenker, Sho Yaida
- Physical review letters
- 2008

In recent work we showed that, for a class of conformal field theories (CFT) with Gauss-Bonnet gravity dual, the shear viscosity to entropy density ratio, eta/s, could violate the conjectured Kovtun-Starinets-Son viscosity bound, eta/s > or = 1/4 pi. In this Letter we argue, in the context of the same model, that tuning eta/s below (16/25)(1/4 pi) induces… (More)

Free scalar fields in de Sitter space have a one-parameter family of states invariant under the de Sitter group, including the standard thermal vacuum. We show that, except for the thermal vacuum, these states are unphysical when gravitational interactions are included. We apply these observations to the quantum state of the inflaton, and find that at best,… (More)

- Daniel FRIEDAN, Zongan QIU, Stephen SHENKER
- 2002

We discuss the realization of superconformal invariance in two dimensional quantum field theory. The Hilbert space of a superconformal theory splits into two sectors; one a representation of the Neveu-Schwarz algebra, the other of the Ramond algebra. We introduce the spin fields which intertwine the two sectors and correspond to the irreducible… (More)

- Joanne COHN, Daniel FRIEDAN, Zongan QIU, Stephen SHENKER, Enrico Fermi, ZONTA Amelia Earhart
- 2002

A brief review of superconformal field theory and superstrings is presented. The spacetime spinor contribution to the fermion vertex operator is constructed and the four-fermion amplitude is calculated using the differential equation method in the SO(1,9) current algebra. The spinor field is also described as a vertex operator in the bosonization of the… (More)