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SUMMARY:Bootstrapping Inflationary Correlators
DTSTART;VALUE=DATE-TIME:20190729T210000Z
DTEND;VALUE=DATE-TIME:20190729T212000Z
DTSTAMP;VALUE=DATE-TIME:20200704T022903Z
UID:indico-contribution-302482-3454914@indico.cern.ch
DESCRIPTION:Speakers: Hayden Lee ()\nThe central idea of the bootstrap app
roach is to constrain observables directly from consistency conditions\, e
schewing the complexity of the Lagrangian formalism. In this talk\, I will
adopt this viewpoint and discuss how the structure of correlation functio
ns in inflation is controlled by (approximate) conformal symmetry and sing
ularities\, focusing on three- and four-point functions at tree level. In
particular\, I will describe classes of differential operators that shift
the masses and spins of external/internal particles\, allowing general inf
lationary correlators to be written in terms of a few seed functions. I wi
ll also highlight spectroscopic signatures encoded in these correlators\,
which can be searched for in future cosmological observations.\n\nhttps://
indico.cern.ch/event/782953/contributions/3454914/
LOCATION:Northeastern University West Village G 106
URL:https://indico.cern.ch/event/782953/contributions/3454914/
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SUMMARY:A Quadrillion Standard Models from F-theory
DTSTART;VALUE=DATE-TIME:20190729T204000Z
DTEND;VALUE=DATE-TIME:20190729T210000Z
DTSTAMP;VALUE=DATE-TIME:20200704T022903Z
UID:indico-contribution-302482-3454915@indico.cern.ch
DESCRIPTION:Speakers: Jiahua Tian (Northeastern University)\nWe present an
explicit construction of $\\mathcal{O}(10^{15})$ globally consistent stri
ng compactifications that realize the exact chiral spectrum of the Standar
d Model of particle physics with gauge coupling unification in the context
of F-theory. Utilizing the power of algebraic geometry\, all global consi
stency conditions can be reduced to a single criterion on the base of the
underlying elliptically fibered Calabi--Yau fourfolds. For toric bases\, t
his criterion only depends on an associated polytope and is satisfied for
at least $\\mathcal{O}(10^{15})$ bases\, each of which defines a distinct
compactification.\n\nhttps://indico.cern.ch/event/782953/contributions/345
4915/
LOCATION:Northeastern University West Village G 106
URL:https://indico.cern.ch/event/782953/contributions/3454915/
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SUMMARY:Strings in Ramond-Ramond (RR) Backgrounds from the Neveu-Schwarz-R
amond (NSR) Formalism
DTSTART;VALUE=DATE-TIME:20190729T202000Z
DTEND;VALUE=DATE-TIME:20190729T204000Z
DTSTAMP;VALUE=DATE-TIME:20200704T022903Z
UID:indico-contribution-302482-3454912@indico.cern.ch
DESCRIPTION:Speakers: Minjae Cho ()\nIn contrast to the fact that there ar
e many interesting solutions to supergravity equations of motions describi
ng backgrounds around which we can study physics\, perturbative string the
oretic approach to such backgrounds was mostly limited to special cases. I
n particular\, it is commonly believed that the NSR formalism of perturbat
ive string theory has limitations in describing type II strings in RR back
ground. In this talk\, I discuss how we can systematically describe RR flu
x backgrounds in the framework of closed superstring field theory based on
the NSR formalism\, and present two applications of the framework: the pp
-wave background supported by 5-form flux and AdS3xS3 supported by mixed 3
-form fluxes.\n\nhttps://indico.cern.ch/event/782953/contributions/3454912
/
LOCATION:Northeastern University West Village G 106
URL:https://indico.cern.ch/event/782953/contributions/3454912/
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BEGIN:VEVENT
SUMMARY:Long String Scattering in c=1 String Theory
DTSTART;VALUE=DATE-TIME:20190729T200000Z
DTEND;VALUE=DATE-TIME:20190729T202000Z
DTSTAMP;VALUE=DATE-TIME:20200704T022903Z
UID:indico-contribution-302482-3454911@indico.cern.ch
DESCRIPTION:Speakers: Bruno Balthazar (Harvard University)\nWe compute sca
ttering amplitudes for long strings in c=1 string theory and in the dual m
atrix model. On the worldsheet side\, the long string amplitudes are obtai
ned from the boundary conformal field theory of open strings on FZZT brane
s\, in a limit where the branes decouple. In particular\, we compute tree-
level amplitudes for a long string to emit a closed string\, and for the 2
-to-2 scattering of long strings. These are numerically matched to computa
tions in the adjoint and bi-adjoint sectors of the dual matrix model\, the
reby providing strong evidence for the duality beyond the singlet sector.\
n\nhttps://indico.cern.ch/event/782953/contributions/3454911/
LOCATION:Northeastern University West Village G 106
URL:https://indico.cern.ch/event/782953/contributions/3454911/
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SUMMARY:Compensator fields in dimensional reduction and compactification w
ithout truncation
DTSTART;VALUE=DATE-TIME:20190729T184000Z
DTEND;VALUE=DATE-TIME:20190729T190000Z
DTSTAMP;VALUE=DATE-TIME:20200704T022903Z
UID:indico-contribution-302482-3454919@indico.cern.ch
DESCRIPTION:Speakers: Michael Schulz (Bryn Mawr College)\nIn dimensionally
reduced theories with gauge (or diffeomorphism) invariance\, consistency
of the Kaluza-Klein ansatz requires the introduction of compensator fields
. The compensator fields project gauge-variant field fluctuations to thei
r horizontal components\, which in turn determine the gauge-invariant modu
li space metric that appears in kinetic terms of the lower dimensional the
ory. The compensator fields must be introduced "by hand" in dimensional r
eduction (i.e.\, compactification truncated to zero modes)\, but arise aut
omatically in the full untruncated theory. For the U(1)\, Yang-Mills theo
ry\, and pure Einstein gravity compactified on an arbitrary compact manifo
ld\, we re-express the full untruncated parent theory in lower dimensional
language\, and identify the compensator fields. One of their known geome
tric interpretations features prominently. The moduli space of gauge fiel
ds (or metrics) on the compact manifold can be regarded as a principal bun
dle whose fiber is the space of gauge transformations. The compensator fi
elds arise as a repackaging of the connection on this bundle.\n\nhttps://i
ndico.cern.ch/event/782953/contributions/3454919/
LOCATION:Northeastern University West Village G 106
URL:https://indico.cern.ch/event/782953/contributions/3454919/
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SUMMARY:3d Matter Coupled to Chern-Simons Field\, Spontaneous Breaking of
Scale Invariance and Fermion-Boson Mapping
DTSTART;VALUE=DATE-TIME:20190729T182000Z
DTEND;VALUE=DATE-TIME:20190729T184000Z
DTSTAMP;VALUE=DATE-TIME:20200704T022903Z
UID:indico-contribution-302482-3454918@indico.cern.ch
DESCRIPTION:Speakers: Moshe Moshe (Technion - Israel Inst. of Techniology)
\nThe singlet sector of vector\, large $N$\, 3d field theory corresponds
to Vasiliev higher spin theory on $AdS_4$. Will discuss three dimensional
$U(N)$ symmetric field theory with fermion and boson matter coupled to
a topological Chern-Simons field. In the presence of a marginal deformati
on will determine the conditions for the existence of a phase with spontan
eous breaking of scale invariance. In this phase the ground state contains
massive $U(N)$ quanta and a massless $U(N)$ singlet bound state goldstone
boson - the Dilaton. Will show that such a phase appears only in the pres
ence of a marginal deformation.The massless Dilaton appears in the spectru
m provided certain relations between coupling constants are satisfied. Wi
ll discuss the fermion-boson mapping and show that the conditions for spon
taneous breaking of scale invariance in the boson and fermion theories are
copies of each other.\nWill present recent progress on the older papers:\
nM M and J. Zinn-Justin JHEP 1501 (2015) 054 arXiv:1410.0558 [hep-th]\nW.
A. Bardeen and M M JHEP 1406 (2014) 113 arXiv:1402.4196 [hep-th]\n\nhttps
://indico.cern.ch/event/782953/contributions/3454918/
LOCATION:Northeastern University West Village G 106
URL:https://indico.cern.ch/event/782953/contributions/3454918/
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SUMMARY:Contact Geometry and Quantum Mechanics
DTSTART;VALUE=DATE-TIME:20190729T180000Z
DTEND;VALUE=DATE-TIME:20190729T182000Z
DTSTAMP;VALUE=DATE-TIME:20200704T022903Z
UID:indico-contribution-302482-3454916@indico.cern.ch
DESCRIPTION:Speakers: Andrew Waldron (Department of Mathematics and QMAP\,
University of California Davis\,)\nQuantization together with quantum dyn
amics can be simultaneously formulated as the problem of finding an approp
riate flat connection on a Hilbert bundle over a contact manifold. Contact
geometry treats time\, generalized positions and momenta as points on an
underlying phase-spacetime and reduces classical mechanics to contact topo
logy. Contact quantization describes quantum dynamics in terms of parallel
transport for a flat connection\; the ultimate goal being to also handle
quantum systems in terms of contact topology. Our main result is a proof o
f local\, formal gauge equivalence for a broad class of quantum dynamical
systemsâ€”just as classical dynamics depends on choices of clocks\, local
quantum dynamics can be reduced to a problem of studying gauge transformat
ions. We further show how to write quantum correlators in terms of paralle
l transport and in turn matrix elements for Hilbert bundle gauge transform
ations\, and give the path integral formulation of these results. Finally\
, we show how to relate topology of the underlying contact manifold to bou
ndary conditions for quantum wave functions.\n\nhttps://indico.cern.ch/eve
nt/782953/contributions/3454916/
LOCATION:Northeastern University West Village G 106
URL:https://indico.cern.ch/event/782953/contributions/3454916/
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