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CATEGORIES:Wednesday HEP-GR Colloquium
SUMMARY:Cancelling the vacuum energy and Weyl anomaly in t
he standard model with dimension zero scalars - Ne
il Turok (University of Edinburgh and Perimeter In
stitute for Theoretical Physics)
DTSTART;TZID=Europe/London:20211110T141500
DTEND;TZID=Europe/London:20211110T151500
UID:TALK164437AThttp://talks.cam.ac.uk
URL:http://talks.cam.ac.uk/talk/index/164437
DESCRIPTION:In recent work with Latham Boyle (see arXiv:2110.0
6258) we point out that\, at leading order\, the v
acuum energy and the Weyl anomaly in the gauge/fer
mion part of the standard model are cancelled by 3
6 Weyl-invariant\, dimension zero scalars. The can
cellations are highly nontrivial: assuming the gau
ge group SU3xSU2xU1\, they require precisely 3 gen
erations of standard model fermions\, each includi
ng a right-handed neutrino. Many candidate extensi
ons of the standard model including popular grand
unified theories are ruled out by this criterion.
The extra scalars have a four-derivative action wi
th potential for ghosts. However\, in a careful Eu
clidean treatment consistent with our recent propo
sal (see arXiv:2109.06204)\, we show that a physic
al state space with only positive energies and nor
ms may be identified. The dimension zero scalars p
ossess a scale-invariant power spectrum in their q
uantum vacuum\, suggesting a new\, first-principle
s explanation of the scalar perturbations in cosmo
logy not requiring inflation. As pointed out earli
er\, one of the three right handed neutrinos is th
e simplest yet proposed candidate for the dark mat
ter. This remarkable combination of predictions\,
spanning a huge range of scales\, suggests dimensi
on zero scalars might play a basic role in fundame
ntal physics. If time allows\, I will briefly disc
uss the possible emergence of the Higgs field and
the spacetime metric\, within this framework.
LOCATION:HYBRID - Details to be sent by email
CONTACT:
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