Newton-Hooke spacetimes, Hpp-waves and the cosmological constant

Abstract

We show explicitly how the Newton-Hooke groups act as symmetries of the equations of motion of non-relativistic cosmological models with a cosmological constant. We give the action on the associated non-relativistic spacetimes and show how these may be obtained from a null reduction of 5-dimensional homogeneous pp-wave Lorentzian spacetimes. This allows us to realize the Newton-Hooke groups and their Bargmann type central extensions as subgroups of the isometry groups of the pp-wave spacetimes. The extended Schrodinger type conformal group is identified and its action on the equations of motion given. The non-relativistic conformal symmetries also have applications to time-dependent harmonic oscillators. Finally we comment on a possible application to Gao's generalization of the matrix model.

21 pages

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• Celestial Mechanics, Conformal Structures, and Gravitational Waves
• Penrose limits, supergravity and brane dynamics
• Homogeneous Plane Waves
• Tachyon Condensates, Carrollian Contraction of Lorentz Group, and Fundamental Strings
• Non-Relativistic Spacetimes with Cosmological Constant
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