![]() #12 strings theory full#While the various corners in this web that are described by perturbative string theories are fairly well understood, we are still far from a complete understanding of nonperturbative regimes in the full M-theory. It has long been known that different string theories are limits of M-theory. Finally, we discuss applications of nonrelativistic strings to decoupling limits in the context of the AdS/CFT correspondence. We also give a review of nonrelativistic open strings and effective field theories living on D-branes. This is known as (torsional) string Newton–Cartan geometry, which is neither Lorentzian nor Riemannian. We then give an overview of recent progress, including the appropriate target-space geometry that nonrelativistic strings couple to. In this review, we start with an introduction to the foundations of nonrelativistic string theory in flat spacetime. In recent years, there has been a resurgence of interest in the non-Lorentzian geometries and quantum field theories that arise from nonrelativistic string theory in background fields. This string theory also gives a unitary and ultraviolet complete framework that connects different corners of string theory, including matrix string theory and noncommutative open strings. It has a string spectrum with a Galilean dispersion relation, and a spacetime S-matrix with nonrelativistic symmetry. This theory arises as a self-contained corner of relativistic string theory. In flat spacetime, the theory is defined by a two-dimensional relativistic quantum field theory with nonrelativistic global symmetries acting on the worldsheet fields. We review recent developments on nonrelativistic string theory. 2Nordita, KTH Royal Institute of Technology and Stockholm University, Stockholm, Sweden.1The Niels Bohr Institute, University of Copenhagen, Copenhagen Ø, Denmark. ![]()
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