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Seminars

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  • Title:Einstein Double Field Equations
  • Start Date/Time:2018-10-18 / 12:30
  • End Date/Time :2018-10-18 / 13:30
    • Speaker:Prof. Jeong-Hyuck Park (Sogang University)
    • Place:R521, 5F, 2nd General Building, Nat'l Tsing Hua Univ.
    • Host:Prof. Chong-Sun Chu (NTHU)
    • Abstract:
      String theory predicts its own gravity rather than General Relativity. In GR, the metric is the only geometric and gravitational field, whereas in string theory the closed-string massless sector comprises a skew-symmetric B-field and the string dilaton in addition to the metric. Furthermore, these three fields transform into each other under T-duality. This hints at a natural augmentation of GR: upon treating the whole closed string massless sector as stringy graviton fields, Double Field Theory may evolve into `Stringy Gravity'. Equipped with an O(D,D) covariant differential geometry beyond Riemann, we spell out the definitions of the stringy Einstein curvature tensor and the stringy Energy-Momentum tensor. Equating them, all the equations of motion of the closed string massless sector are unified into a single expression which we dub the Einstein Double Field Equations.
      I will also discuss a Kaluza-Klein reduction of Stringy Gravity which is moduli-free.
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