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SUMMARY:[RIKEN Seminar] From anomalous correlations to dark matter: the ef
fects of higher topological charge
DTSTART;VALUE=DATE-TIME:20200521T130000Z
DTEND;VALUE=DATE-TIME:20200521T140000Z
DTSTAMP;VALUE=DATE-TIME:20220126T165528Z
UID:indico-event-8424@indico.bnl.gov
DESCRIPTION:Topological gauge field configurations play an important role
in the phenomenology of QCD. The axial anomaly is inextricably linked to t
opological effects. They give rise to anomalous meson masses\, affect the
order of the chiral phase transition\, and lead to the chiral magnetic eff
ect which is relevant for condensed matter and heavy-ion physics. On the f
lip side\, topological gauge field configurations can also give rise to CP
violating effects in QCD. A potential resolution of this strong CP proble
m involves a new particle\, the axion. Incidentally\, axions are also viab
le dark matter candidates and their properties are largely determined by t
he distribution of topological charge in QCD. At high energies in the deco
nfined regime\, the topological structure of QCD is well described by a di
lute gas of instantons. In this regime all the effects mentioned above are
typically studied based on instantons of unit topological charge. As disc
ussed in this talk\, there are also effects uniquely related to instantons
of higher topological charge. On the one hand\, they give rise to higher-
order anomalous quark correlations which manifest themselves in anomalous
hadronic interactions. On the other hand\, they modify the distribution of
topological charge. This\, in turn\, affects the properties of axions and
can lead to a topological mechanism to increase the amount of axion dark
matter.\n\nhttps://indico.bnl.gov/event/8424/
LOCATION:BlueJeans https://bluejeans.com/651508428
URL:https://indico.bnl.gov/event/8424/
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