CENTRA Seminar - Goldstone Gravity From Spontaneous Lorentz Violation - 7 maio 2013
Abstract / Resumo
We present a theory of gravity in which a symmetric two-index tensor in Minkowski spacetime acquires a vacuum expectation value (vev) via a potential, thereby breaking Lorentz invariance spontaneously. Two of the resulting Nambu-Goldstone modes have properties that are identical to those of the graviton in general relativity. Imposing self-consistent coupling to the energy-momentum tensor constrains the potential for the Lorentz violation. This self-consistent bootstrap leads to a nonlinear theory of gravity, containing kinetic and potential terms along with a matter coupling. At energies small compared to the Planck scale, the theory contains general relativity. Integrating out massive modes yields Lorentz-violating radiative-correction terms in the low-energy effective Lagrangian, that can lead to observable effects.
7 de maio de 2013 | 14:30
Meeting room on the 2nd floor of the Physics Department building
Watch it live on: http://www.ustream.tv/channel/centra | IST-seminars (also available on CENTRA TV webpage)
Talks' slides: http://centra.ist.utl.pt/~blackholes/seminars/potting.pdf (available right before the seminar)