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SUMMARY:The resolution of singularities in gravitational collapse and its
implications for astrophysical black holes
DTSTART;VALUE=DATE-TIME:20190626T123000Z
DTEND;VALUE=DATE-TIME:20190626T133000Z
DTSTAMP;VALUE=DATE-TIME:20190724T001600Z
UID:indico-event-19203@agenda.infn.it
DESCRIPTION:Speakers: Daniele Malafarina (Nazarbayev University)\nThe rece
nt observations of gravitational waves from binary black hole mergers and
of the ‘shadow’ of the supermassive black hole in the galaxy M87 have
finally\ndelivered experimental data of phenomena where the limits of Gene
ral Relativity could be tested. One one hand\, observations seem to confir
m that black hole\ncandidates are well described by the classical relativi
stic solutions. On the other hand\, the existence of curvature singulariti
es in such solutions suggests\nthat there must exist a regime where the cl
assical description fails. Many theoretical models describing relativistic
collapse without the occurrence of singularities have been developed over
the last few decades. Such models may\nbear significant consequences for
astrophysical black holes. The times seem now mature enough to ask whether
such consequences may be tested experimentally.\nhttps://agenda.infn.it/e
vent/19203/
LOCATION:
URL:https://agenda.infn.it/event/19203/
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SUMMARY:Generalized Higgs Effective Field Theory
DTSTART;VALUE=DATE-TIME:20190709T003000Z
DTEND;VALUE=DATE-TIME:20190709T023000Z
DTSTAMP;VALUE=DATE-TIME:20190724T001600Z
UID:indico-event-19359@agenda.infn.it
DESCRIPTION:Speakers: Ryo Nagay (ICRR\, U. of Tokyo)\nWe formulate a gener
alization of Higgs effective field theory (HEFT)\nincluding arbitrary numb
er of\nextra neutral and charged Higgs bosons (generalized HEFT\, GHEFT) t
o\ndescribe non-minimal electroweak\nsymmetry breaking models. Using the g
eometrical form of the GHEFT\nLagrangian\, which can be regarded\nas a non
linear sigma model on a scalar manifold\, it is shown that the\nscalar bos
on scattering amplitudes are\ndescribed in terms of the Riemann curvature
tensor (geometry) of the\nscalar manifold and the covariant\nderivatives o
f the potential. The one-loop divergences in the oblique\ncorrection param
eters S and U can\nalso be written in terms of the Killing vectors (symmet
ry) and the Riemann\ncurvature tensor (geometry).\nIt is found that pertur
bative unitarity of the scattering amplitudes\ninvolving the Higgs bosons
and the longitudinal\ngauge bosons demands the flatness of the scalar mani
fold. The relationship\nbetween the finiteness of the\nelectroweak oblique
corrections and perturbative unitarity of the\nscattering amplitudes is a
lso clarified in\nthis language: we verify that once the tree-level unitar
ity is ensured\,\nthen the one-loop finiteness of the oblique\ncorrection
parameters S and U is automatically guaranteed.\n This talk is based on a
rXiv:1904.07618.\n\n \nhttps://agenda.infn.it/event/19359/
LOCATION:
URL:https://agenda.infn.it/event/19359/
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