Séminaire de Physique Théorique
Colliding Impulsive Gravitational Waves and a Cosmological ConstantPeter Hogan (University College Dublin)
Thursday 30 April 2015 14:00 - Tours - Salle 1180 (Bât E2)
Résumé :
We present a space-time model of the collision of two homogeneous, plane impulsive gravitational waves (each having a delta function profile) propagating in a vacuum before collision and for which the post collision space-time has constant curvature. The profiles of the incoming waves are k*delta(u) and l*delta(v) where k, l are real constants and u=0, v=0 are intersecting null hypersurfaces. The cosmological constant in the post collision region of space-time is given by -6kl. In this sense this model collision provides a classical mechanism for generating a cosmological constant.
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