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SUMMARY:On the smallness of the cosmological constant in SUGRA models with
Planck scale SUSY breaking and degenerate vacua
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UID:indico-contribution-122-1568@indico.ific.uv.es
DESCRIPTION:Speakers: Roman Nevzorov (University of Adelaide)\nIn $N=1$ su
pergravity (SUGRA) supersymmetric (SUSY) and non-supersymmetric Minkowski
vacua originating in the hidden \nsector can be degenerate. This allows f
or consistent \nimplementation of the multiple point principle (MPP) \nass
umption. We present no--scale inspired SUGRA model \nwhere the MPP assumpt
ion is realised at the tree--level \nwithout extra fine-tuning. In the sup
ersymmetric phase \nin flat Minkowski space SUSY may be broken dynamically
\ninducing tiny vacuum energy density which can be assigned\, \nby virtue
of MPP\, to all other phases including the one \nin which we live. We arg
ue that the measured value of the cosmological constant\, as well as the s
mall values of \nquartic Higgs self--coupling and the corresponding beta \
nfunction at the Planck scale\, which can be obtained by extrapolating the
Standard Model (SM) couplings to high \nenergies\, can originate from sup
ergravity (SUGRA) models \nwith degenerate vacua. This scenario is realise
d if \nthere are at least three exactly degenerate vacua. In the \nfirst v
acuum\, associated with the physical one\, local \nsupersymmetry (SUSY) is
broken near the Planck scale \nwhile the breakdown of the $SU(2)_W\\times
U(1)_Y$ symmetry \ntakes place at the electroweak (EW) scale. In the seco
nd \nvacuum local SUSY breaking is induced by gaugino condensation \nat a
scale which is just slightly lower than $\\Lambda_{QCD}$ \nin the physical
vacuum. Finally\, in the third vacuum local \nSUSY and EW symmetry are br
oken near the Planck scale.\n\nhttps://indico.ific.uv.es/event/2025/contri
butions/1568/
LOCATION: Sala 8+9
URL:https://indico.ific.uv.es/event/2025/contributions/1568/
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SUMMARY:Calculating repetitively.III:
DTSTART;VALUE=DATE-TIME:20140705T100000Z
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UID:indico-contribution-122-1437@indico.ific.uv.es
DESCRIPTION:Speakers: Gopinath Kamath (Indian Institute of Technology Madr
as)\nThis talk has two highlights: a. The utility of the Dirac δ – func
tion as an aid to repetitive integration in multiple integrals\, and b. An
extension to 3 + 1 dimensional stationary curved space of a recent effort
by the author in 2 + 1 dimensional stationary curved space to determine t
he zeta function for the Lagrangian density for a real massive scalar fiel
d using the Schwinger operator expansion\; this is a reworking to advantag
e by the author of the Antonsen – Bormann idea that was originally propo
sed by these latter authors for the computation of the heat kernel in curv
ed space. The repetitive nature of the calculation in 2 + 1 dimensional cu
rved space at all higher orders(≥3) in the gravitational constant G sugg
ested the use of the Dirac delta-function and one of its integral represen
tations – in that it is convenient to obtain answers\, so its utility is
also checked in the 3 + 1 dimensional case.\n\nhttps://indico.ific.uv.es/
event/2025/contributions/1437/
LOCATION: Sala 8+9
URL:https://indico.ific.uv.es/event/2025/contributions/1437/
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SUMMARY:A unified approach to nuclei: The BPS Skyrme Model
DTSTART;VALUE=DATE-TIME:20140705T130000Z
DTEND;VALUE=DATE-TIME:20140705T133000Z
DTSTAMP;VALUE=DATE-TIME:20190717T210232Z
UID:indico-contribution-122-1418@indico.ific.uv.es
DESCRIPTION:Speakers: Carlos Naya (Universidade de Santiago de Compostela
and Instituto Galego de Física de Altas Enerxías (IGFAE))\nIn this talk\
, we will present a concrete model of a low energy effective field theory
of QCD\, the well-known Skyrme Model. Specifically\, we will work with the
BPS submodel [1] in order to describe the binding energies of nuclei. Thi
s BPS Skyrme model is charaterized by having a saturated bound for the ene
rgy proportional to the baryon number of the nuclei. After presenting this
classical result\, we will proceed with a semi-classical quantization of
the coordinates of spin and isospin. Then\, with the further inclusion of
the Coulomb interaction as well as a small explicit breaking of the isospi
n symmetry\, we finally calculate the binding energies of nuclei\, where a
n excellent agreement has been found for the nuclei with high baryon numbe
r [2]\, [3].\n\n\nReferences\n\n[1] C. Adam\, J. Sanchez-Guillen\, A. Were
szczynski\, Acta Phys. Pol. B 41\, (2010) 2717 .\n[2] C. Adam\, C. Naya\,
J. Sanchez-Guillen\, A. Wereszczynski\, Phys. Rev. Lett. 111 (2013) 232501
.\n[3] C. Adam\, C. Naya\, J. Sanchez-Guillen\, A. Wereszczynski\, Phys. R
ev. C 88 (2013) 054313.\n\nhttps://indico.ific.uv.es/event/2025/contributi
ons/1418/
LOCATION: Sala 8+9
URL:https://indico.ific.uv.es/event/2025/contributions/1418/
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SUMMARY:Lifshitz hyperscaling violating holography
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DTEND;VALUE=DATE-TIME:20140705T140000Z
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UID:indico-contribution-122-1371@indico.ific.uv.es
DESCRIPTION:Speakers: Ioannis Papadimitriou (Instituto de Fisica Teorica U
AM/CSIC)\nHolographic techniques have been instrumental in understanding c
ertain aspects of strongly correlated systems\, both in high energy and co
ndensed matter physics. One of the most interesting applications of hologr
aphy in the condensed matter setting is the study of quantum critical poin
ts exhibiting Lifshitz or hyperscaling violating Lifshitz symmetry. Althou
gh various aspects of the holographic dictionary for Lifshitz quantum crit
ical points have been studied in special cases\, the general structure for
arbitrary critical exponent z has not been fully understood\, while very
little is known for the hyperscaling violating case. \n\nWe develop a gene
ral method for systematically constructing the holographic dictionary for
both Lifshitz and hyperscaling violating Lifshitz critical points with arb
itrary Lorentz violating and hyperscaling violating parameters\, for a lar
ge class of bulk actions admitting such backgrounds. This allows us to det
ermine quite generically various physical properties of the dual quantum c
ritical points\, such as the spectrum of operators\, the Ward identities\,
and the Lifshitz confromal anomaly.\n\nhttps://indico.ific.uv.es/event/20
25/contributions/1371/
LOCATION: Sala 8+9
URL:https://indico.ific.uv.es/event/2025/contributions/1371/
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BEGIN:VEVENT
SUMMARY:Vacuum instability in holography
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UID:indico-contribution-122-1358@indico.ific.uv.es
DESCRIPTION:Speakers: Koji Hashimoto (Osaka university / RIKEN)\nWe analyz
e vacuum instability of strongly coupled gauge theories in a constant\nele
ctric ﬁeld using AdS/CFT correspondence. The model is the N = 2 1-ﬂavo
r\nsupersymmetric large Nc QCD in the strong ’t Hooft coupling limit. We
calculate the\nEuler-Heisenberg eﬀective Lagrangian L(E)\, which encode
s the nonlinear response\nand the quantum decay rate of the vacuum in a ba
ckground electric ﬁeld E\, from\nthe complex D-brane action in AdS/CFT.
We ﬁnd that the decay rate given by\nImL(E) becomes nonzero above a crit
ical electric ﬁeld set by the conﬁning force\nbetween quarks. A large
E expansion of Im L(E) is found to coincide with that\nof the Schwinger e
ﬀects in QED\, replacing its electron mass by the conﬁning force.\n\nh
ttps://indico.ific.uv.es/event/2025/contributions/1358/
LOCATION: Sala 8+9
URL:https://indico.ific.uv.es/event/2025/contributions/1358/
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SUMMARY:N=2 SUGRA BPS Multi-center solutions\, quadratic prepotentials and
Freudenthal transformations
DTSTART;VALUE=DATE-TIME:20140705T110000Z
DTEND;VALUE=DATE-TIME:20140705T113000Z
DTSTAMP;VALUE=DATE-TIME:20190717T210232Z
UID:indico-contribution-122-1253@indico.ific.uv.es
DESCRIPTION:Speakers: torrente-lujan emilio (universidad de murcia)\nWe pr
esent a detailed description of $N=2$ stationary \nBPS multicenter black
hole solutions for quadratic prepotentials\nwith an arbitrary number of ce
nters and scalar fields\nmaking a systematic use of the algebraic propert
ies of the matrix of second derivatives of the prepotential\, $\\mathcal{
S}$\, which in this case is a scalar-independent matrix. In particular we
obtain bounds on the physical parameters of the multicenter solution such
as horizon areas and ADM mass. We discuss the possibility and convenience
of setting up a basis of the symplectic vector space built from charge \ne
igenvectors of the $\\ssigma$\, the set of vectors \n$(\\Ppm q_a)$ with $\
\Ppm$ $\\ssigma$-eigenspace projectors.\n\nThe anti-involution matrix $\\m
athcal{S}$ can be understood \nas a Freudenthal duality $\\tilde{x}=\\ssi
gma x$.\nWe show that this duality can be generalized to\n``Freudenthal tr
ansformations'' \n$$x\\to \\lambda\\exp(\\theta \\ssigma) x= a x+b\\tilde{
x}$$\nunder which the horizon area\, ADM mass and intercenter \ndistances
scale up leaving constant the scalars at the fixed points.\nIn the special
case $\\lambda=1$\, ``$\\ssigma$-rotations''\, \nthe transformations leav
e invariant the solution.\nThe standard Freudenthal duality can be written
as\n $\\tilde x= \\exp\\left(\\frac{\\pi}{2} \\ssigma\\right) x .$\nWe ar
gue that these generalized transformations leave\ninvariant not only the
quadratic prepotential theories\n but also the general stringy extremal qu
artic form $\\Delta_4$\,\n$\\Delta_4(x)= \\Delta_4(\\cos\\theta x+\\sin\\t
heta\\tilde{x})$\nand therefore its entropy at lowest order.\n\nhttps://in
dico.ific.uv.es/event/2025/contributions/1253/
LOCATION: Sala 8+9
URL:https://indico.ific.uv.es/event/2025/contributions/1253/
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SUMMARY:Spontaneous Breaking of Scale Invariance in U(N) Chern-Simons Gaug
e Theories in Three Dimensions
DTSTART;VALUE=DATE-TIME:20140705T140000Z
DTEND;VALUE=DATE-TIME:20140705T143000Z
DTSTAMP;VALUE=DATE-TIME:20190717T210232Z
UID:indico-contribution-122-1108@indico.ific.uv.es
DESCRIPTION:Speakers: William Bardeen (Fermilab)\nI demonstrate the existe
nce of a massive phase in a conformally invariant U(N) \nChern-Simons gaug
e theory in D=3 with matter fields in the fundamental representation. The
se \nmodels have attracted recent attention as being dual\, in the conform
al phase\, to theories of \nhigher spin gravity on AdS_4. Using the ‘t
Hooft large N expansion\, exact solutions are \nobtained for scalar curren
t correlators in the massive phase where the conformal symmetry \nis spont
aneously broken. A massless dilaton appears as a composite state\, and it
s \nproperties are discussed. Solutions exist for matter fields that are
either bosons or fermions.\n\nhttps://indico.ific.uv.es/event/2025/contrib
utions/1108/
LOCATION: Sala 8+9
URL:https://indico.ific.uv.es/event/2025/contributions/1108/
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SUMMARY:A scenario for critical scalar field collapse in AdS_3
DTSTART;VALUE=DATE-TIME:20140705T143000Z
DTEND;VALUE=DATE-TIME:20140705T150000Z
DTSTAMP;VALUE=DATE-TIME:20190717T210232Z
UID:indico-contribution-122-1071@indico.ific.uv.es
DESCRIPTION:Speakers: Alessandro Fabbri (Centro Fermi / Univ. Bologna / IF
IC (CSIC))\nWe present a family of exact solutions\, depending on two para
meters\nalpha and b (related to the scalar field strength)\, to the three-
dimensional Einstein-scalar field equations with negative cosmological con
stant.\nFor b = 0 these solutions reduce to the static BTZ family of vacuu
m\nsolutions\, with mass M =-alpha. For nonvanishing b\, the solutions bec
ome\ndynamical and develop a strong spacelike central singularity. \nThe a
lpha 0 agrees qualitatively with that observed in numerical simulations o
f subcritical collapse. \nWe analyze the linear perturbations of the thres
hold solution\,\nalpha = 0\, in the Lambda = 0 approximation\, and find th
at it has only one unstable growing mode\, which qualifies it as a candida
te critical solution for scalar field collapse.\n\nhttps://indico.ific.uv.
es/event/2025/contributions/1071/
LOCATION: Sala 8+9
URL:https://indico.ific.uv.es/event/2025/contributions/1071/
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