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CATEGORIES:HEP phenomenology joint Cavendish-DAMTP seminar
SUMMARY:The classical equations of motion of quantised gau
ge theories - Tom Melia (IPMU)
DTSTART;TZID=Europe/London:20230803T160000
DTEND;TZID=Europe/London:20230803T170000
UID:TALK200473AThttp://talks.cam.ac.uk
URL:http://talks.cam.ac.uk/talk/index/200473
DESCRIPTION:The Einstein and Maxwell equations are the jewels
in the crown of classical physics. But classical p
hysics is only an approximation to nature\, arisin
g as a limit of the underlying quantum mechanical
description. And in the case of both general relat
ivity and electromagnetism\, owing to their gauge
theory nature\, the full set of classical equation
s of motion are not guaranteed to follow from the
quantum theory. The time-time and time-space compo
nents of the Einstein equations in GR and Gauss’ l
aw in EM are enforced ‘by hand' in the quantisatio
n procedure—a choice so as to make the classical-l
ike states behave as per our classical belief. \n
\nBut what if our universe was actually described
by another classical-like state? For GR\, the resu
lting modification of the Einstein equations can b
e packaged as the inclusion of an auxiliary energy
-momentum tensor describing a ’shadow’ matter that
adds no additional degrees of freedom to the theo
ry. The homogenous and isotropic background piece
of this auxiliary matter contributes to expansion
of the universe identical to cold dark matter\, an
d the inhomogeneous components source curvature pe
rturbations that grow linearly at linear order.
LOCATION:Potter Room\, B1.34\, DAMTP
CONTACT:Benjamin Christopher Allanach
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