QFT семинар на 11.09.2014

На 11 септември 2014 г. от 13:15 часа в зала 300 на ИЯИЯЕ на редовната сбирка на Работния Семинар по Квантова Теория на Полето професор Едуардо Генделман от Dept. of Physics, Ben-Gurion University of the Negev, Beer-Sheva (Israel) ще изнесе доклад на тема:

"Emergent Cosmology, Inflation and Dark Energy from Spontaneous Breaking of Scale Invariance"

Abstract:

A new class of gravity-matter models defined in terms of two independent non-Riemannian volume forms (alternative generally covariant integration measure densities) on the space-time manifold are studied in some detail. These models involve an additional R2 (square of the scalar curvature) term as well as scalar matter field potentials of appropriate form so that the pertinent action is invariant under global Weyl-scale symmetry. Scale invariance is spontaneously broken upon integration of the equations of motion. After performing transition to the physical Einstein frame we obtain: (i) An effective potential for the scalar field with two flat regions which allows for a unified description of both early universe inflation as well as of present dark energy epoch; (ii) For a definite parameter range the model possesses a non-singular "emergent universe" solution which describes an initial phase of evolution that precedes the inflationary phase.

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