SMS scnews item created by Philip Treharne at Wed 28 Feb 2007 1445
Type: Seminar
Distribution: World
Expiry: 7 Mar 2007
Calendar1: 7 Mar 2007 1400-1500
CalLoc1: Eastern Avenue Lecture Theatre
Auth: philip@pisa.maths.usyd.edu.au

# Applied Maths Seminar: Broadbridge -- Dark Energy States of a Scalar Field in an Unstable Universe

APPLIED MATHEMATICS SEMINAR AT THE UNIVERSITY OF SYDNEY

Speaker: Professor Phil Broadbridge, Australian Mathematical Sciences Institute &
University of Melbourne

Title: Dark Energy States of a Scalar Field in an Unstable Universe

DATE: Wednesday, March 7
TIME: 2:00pm
LOCATION: University of Sydney, Eastern Avenue Lecture Theatre

Abstract:

Observations now indicate an expanding and accelerating universe.  The simplest
compatible large-scale model is the spatially flat FLRW universe with positive
cosmological constant.  The Hamiltonian of a scalar massless Klein-Gordon field,
minimally coupled to the space-time geometry, naturally decomposes into a light
component with well-defined particle numbers, plus a dark component whose most
elementary quantized subsystems have continuous spectrum unbounded below.  At a sequence
of discrete times, progressively shorter wavelength components are lost from the light
domain to the dark domain.

http://www.maths.usyd.edu.au/u/AppliedSeminar
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