String Perturbation Theory on the Schwinger-Keldysh Time Contour

Sep 8, 2020
5 pages
Published in:
  • Phys.Rev.Lett. 125 (2020) 26, 261602
  • Published: Dec 23, 2020
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Abstract: (APS)
We perform the large-N expansion in the Schwinger-Keldysh formulation of nonequilibrium quantum systems with matrix degrees of freedom and study universal features of the anticipated dual string theory. We find a rich refinement of the topological genus expansion: In the original formulation, the future time instant where the forward and backward branches of the Schwinger-Keldysh time contour meet is associated with its own world sheet genus expansion. After the Keldysh rotation, the world sheets decompose into a classical and quantum part.
Note:
  • 5 pages, a few figures; v2: references added; v3: references updated, small clarifying comments added. Final version accepted in Phys. Rev. Lett
  • Elementary Particles and Fields
  • perturbation theory: string
  • string model: duality
  • topological
  • rotation