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SUMMARY:Scale Invariance in Cosmology and Particle Physics using metric in
dependent measures of integrations in the action
DTSTART;VALUE=DATE-TIME:20190507T130000Z
DTEND;VALUE=DATE-TIME:20190507T132000Z
DTSTAMP;VALUE=DATE-TIME:20191118T162608Z
UID:indico-contribution-3403594@indico.cern.ch
DESCRIPTION:Speakers: Eduardo Guendelman (Ben Gurion University)\nAbstract
The use of a metric independent measure of integration in the action open
s new possibilities for constructing globally scale invariant theories\, s
ince the new measure can be assigned a different scaling transformation th
an the usual metric dependent measure sqrt(-g). There are various ways to
construct a density that can serve as a metric independent measure of inte
gration\, from the derivatives of 4 scalar fields or the derivative of a t
hree index tensor field contracted with the alternating symbol. The integr
ation of the equations of motion of these "measure fields" leads to the sp
ontaneous breaking of the scale invariance. A dilaton field with exponenti
al potentials is added and coupled to the different measures. In the effec
tive Einstein frame\, potentials for the dilaton with flat regions appear\
, if curvature square terms are introduced\, two flat regions appear\, one
capable of describing inflation and the other describing the slowly accel
erated phase of the present universe. These models allow non singular cosm
ologies of the emergent type. In the context of the late universe\, it is
shown that the scale invariance is responsible for the avoidance of the 5t
h force problem that could have appeared in connection with the nearly mas
sless dilaton. Also a see saw cosmological mechanism that could explain th
e smallness of the present vacuum energy can be formulated. Finally these
techniques have been used to formulate scale invariant extensions of the S
tandard Model.\n\nhttps://indico.cern.ch/event/721602/contributions/340359
4/
LOCATION:Museum Casa de los Árabes
URL:https://indico.cern.ch/event/721602/contributions/3403594/
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