[Phys-seminars] 2017-04-03 Particles and Fields Seminar
guendel
guendel at bgu.ac.il
Sat Mar 25 23:32:13 IDT 2017
Particles and Fields Seminar
DATE: 03-04-17
TIME: 14:00
PLACE: Physics building (#54) room 207
TITLE:
Interacting Diffusive Unified Dark Energy and Dark Matter from Scalar Fields
SPEAKER:
David Benisty, Department of Physics, Ben Gurion University of the Negev Beer-Sheva 84105, Israel
ABSTRACT/COMMENTS:
Here we generalize ideas of unified Dark Matter Dark Energy in the context of Two Measure Theories and of Dynamical space time Theories. In Two Measure Theories one uses metric independent volume elements and this allows to construct unified Dark Matter Dark Energy, where the cosmological constant appears as an integration constant associated to the eq. of motion of the measure fields. The Dynamical space time Theories generalize the Two Measure Theories by introducing a vector field whose equation of motion guarantees the conservation of a certain Energy Momentum tensor, which may be related, but in general is not the same as the gravitational Energy Momentum tensor. By demanding that this vector field be the gradient of a scalar, the Dynamical space time Theory becomes a theory of Diffusive Unified Dark Energy and Dark Matter, this is because demanding that the vector field be the gradient of a scalar introduces now a mechanism that produces non conserved energy momentum te
nsors instead of conserved energy momentum tensors which leads at the end to a formulation of interacting DE-DM dust models in the form of a diffusive type interacting Unified Dark Energy and Dark Matter scenario.
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