7 research outputs found
An Introduction to T-Duality in String Theory
In these lectures a general introduction to T-duality is given. In the
abelian case the approaches of Buscher, and Ro\u{c}ek and Verlinde are
reviewed. Buscher's prescription for the dilaton transformation is recovered
from a careful definition of the gauge integration measure. It is also shown
how duality can be understood as a quite simple canonical transformation. Some
aspects of non-abelian duality are also discussed, in particular what is known
on relation to canonical transformations. Some implications of the existence of
duality on the cosmological constant and the definition of distance in String
Theory are also suggested.Comment: Latex file (1 figure), dina4p macro inserte
The structure of the exact effective action and the quark confinement in MSSM QCD
An expression for the exact (nonperturbative) effective action of =1
supersymmetric gauge theories is proposed, supposing, that all particles except
for the gauge bosons are massive. Analysis of its form shows, that instanton
effects in the supersymmetric theories can lead to the quark confinement. The
typical scale of confinement in MSSM QCD, calculated from the first principles,
is in agreement with the experimental data. The proposed explanation is quite
different from the dual Higgs mechanism.Comment: Final version to appear in Sov.J.Nucl.Phys. Some insignificant errors
and misprints are correcte
Supersymmetry and Large Scale Left-Right Symmetry
We show that the low energy limit of the minimal supersymmetric Left-Right
models is the supersymmetric standard model with an exact R-parity. The theory
predicts a number of light Higgs scalars and fermions with masses much below
the and breaking scales. The non-renormalizable version of the
theory has a striking prediction of light doubly charged supermultiplets which
may be accessible to experiment. Whereas in the renormalizable case the scale
of parity breaking is undetermined, in the non-renormalizable one it must be
bigger than about GeV. The precise nature of the see-saw
mechanism differs in the two versions, and has important implications for
neutrino masses.Comment: LaTeX, 30 pages. Minor changes. Some references adde
Search for squarks and gluinos in events with hadronically decaying tau leptons, jets and missing transverse momentum in proton-proton collisions at sâ = 13 TeV recorded with the ATLAS detector
A search for supersymmetry in events with large missing transverse momentum, jets, and at least one hadronically decaying tau lepton has been performed using 3.2 fbâ1 of proton-proton collision data at sâ=13 TeV recorded by the ATLAS detector at the Large Hadron Collider in 2015. Two exclusive final states are considered, with either exactly one or at least two tau leptons. No excess over the Standard Model prediction is observed in the data. Results are interpreted in the context of gauge-mediated supersymmetry breaking and a simplified model of gluino pair production with tau-rich cascade decays, substantially improving on previous limits. In the GMSB model considered, supersymmetry-breaking scale (Î) values below 92 TeV are excluded at the 95% confidence level, corresponding to gluino masses below 2000 GeV. For large values of tanÎČ, values of Î up to 107 TeV and gluino masses up to 2300 GeV are excluded. In the simplified model, gluino masses are excluded up to 1570 GeV for neutralino masses around 100 GeV. Neutralino masses up to 700 GeV are excluded for all gluino masses between 800 GeV and 1500 GeV, while the strongest exclusion of 750 GeV is achieved for gluino masses around 1400 GeV
Virtual Reality for Anxiety Disorders: Rethinking a Field in Expansion
The principal aim to this chapter is to present the latest ideas in virtual reality (VR), some of which have already been applied to the field of anxiety disorders, and others are still pending to be materialized. More than 20 years ago, VR emerged as an exposure tool in order to provide patients and therapists with more appealing ways of delivering a technique that was undoubtedly effective but also rejected and thus underused. Throughout these years, many improvements were achieved. The first section of the chapter describes those improvements, both considering the research progresses and the applications in the real world. In a second part, our main interest is to expand the discussion of the new applications of VR beyond its already known role as an exposure tool. In particular, VR is enabling the materialization of numerous ideas that were previously confined to a merely philosophical discussion in the field of cognitive sciences. That is, VR has the enormous potential of providing feasible ways to explore nonclassical ways of cognition, such as embodied and situated information processing. Despite the fact that many of these developments are not fully developed, and not specifically designed for anxiety disorders, we want to introduce these new ideas in a context in which VR is experiencing an enormous transformation