Speaker
Dr
Thomas-Paul Hack
(II. Institut fuer theoretische Physik, Universitaet Hamburg)
Description
We study the backreaction of free quantum fields on a flat Robertson-Walker spacetime. Apart from renormalization freedom, the vacuum energy density receives contributions from both the trace anomaly and the thermal nature of the quantum state. The former represents a dynamical realisation of dark energy, while the latter mimics an effective dark matter component. The semiclassical dynamics yield two classes of asymptotically stable solutions. The first reproduces the LCDM model in a suitable regime. The second lacks a classical counterpart, but is in excellent agreement with recent observations.
Primary authors
Dr
Claudio Dappiaggi
(II. Institut fuer theoretische Physik, Universitaet Hamburg)
Dr
Jan Möller
(Deutsches Elektronen-Synchrotron DESY, Theory Group)
Dr
Nicola Pinamonti
(Dipartimento di Matematica, Universit\`a di Roma ``Tor Vergata'')
Dr
Thomas-Paul Hack
(II. Institut fuer theoretische Physik, Universitaet Hamburg)
