We investigate the holographic correspondence between (p + 1)-dimensional (0 ≤ p ≤ 4) SYM theories with 16 supercharges and superstring theories on the near-horizon limit of Dp-brane backgrounds. Following an approach based on the tunneling picture, we study Euclidean superstring semi-classically along null geodesics which connect two points on the boundary of the spacetime. We extend the analy...

During the last twenty years, we witnessed the rapid development [1,2] of superstring theory which is trying to become a theory of everything. Due to the first and second revolutions of the superstring, although a lot of miraculous characteristics of the superstring such as string duality [3,4,5] are found, we still do not know the first law of the superstring. In the ordinary string theory, th...

We propose a setup with ultracold atomic gases that can be used to make a nonrelativistic superstring in four spacetime dimensions. In particular, we consider for the creation of the superstring a fermionic atomic gas that is trapped in the core of a vortex in a Bose-Einstein condensate. We explain the required tuning of experimental parameters to achieve supersymmetry between the fermionic ato...

There have been many remarkable developments in our understanding of superstring theory in the past few years, a period that has been described as “the second superstring revolution.” Several of them are discussed here. The presentation is intended primarily for the benefit of nonexperts. Lecture presented at the 31st International Ahrenshoop Symposium in Buckow, Germany. Work supported in part...

We present a supersymmetric action functional for the coupled system of an open fundamental superstring and super–D0–branes attached to (identified with) the string endpoints. As a preliminary step the geometrical actions for a free superD0-brane and a free type IIA superstring have been built. The pure bosonic limits of the action for the coupled system and of the equations of motion are discu...

QUANTUM MECHANICS T purpose of this article is to describe some themes in theoretical physics that developed independently for many years, in some cases for decades, and then converged rather suddenly beginning around 1994—95. The convergence produced an upheaval sometimes called "the second superstring revolution." It is as significant in its own way as "the first superstring revolution," the ...

Two-Time physics applies broadly to the formulation of physics and correctly describes the physical world as we know it. Recently it was applied to a 2T reformulation of the d = 4 twistor superstring, which was suggested by Witten as an efficient approach for computations of physical processes in the maximally supersymmetric N = 4 Yang-Mills field theory in four dimensions. The 2T formalism pro...

Perturbative BPS-algebras in superstring theory. ABSTRACT This paper investigates the algebraic structure that exists on perturbative BPS-states in the superstring, compactified on the product of a circle and a Calabi-Yau fourfold. This structure was defined in a recent article by Harvey and Moore. It shown that for a toroidal compactification this algebra is related to a generalized Kac-Moody ...

Sigma model actions are constructed for the Type II superstring compactified to four and six dimensional curved backgrounds which can contain non-vanishing Ramond-Ramond fields. These actions are N=2 worldsheet superconformally invariant and can be covariantly quantized preserving manifest spacetime supersymmetry. They are constructed using a hybrid version of superstring variables which combin...

Multiloop gauge-theory amplitudes written in the Feynman-parameter representation are poised to take advantage of two important developments of the last decade: the spinor-helicity technique and the superstring reorganization. The former has been considered in a previous article; the latter will be elaborated in this paper. We show here how to write multiloop string-like formulas in the Feynman...