Einstein Double Field Equations

  • Event Date: 2018-10-18
  • Particle/String/Cosmology
  • Speaker: Prof. Jeong-Hyuck Park (Sogang University)  /  Host: Prof. Chong-Sun Chu (NTHU)
    Place: R521, 5F, 2nd General Building, Nat'l Tsing Hua Univ.


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.