26 research outputs found
3+1D Massless Weyl spinors from bosonic scalar-tensor duality
We consider the fermionization of a bosonic free theory characterized by the
3+1D scalar - tensor duality. This duality can be interpreted as the
dimensional reduction, via a planar boundary, of the 4+1D topological BF
theory. In this model, adopting the Sommerfield tomographic representation of
quantized bosonic fields, we explicitly build a fermionic operator and its
associated Klein factor such that it satisfies the correct anticommutation
relations. Interestingly, we demonstrate that this operator satisfies the
massless Dirac equation and that it can be identified with a 3+1D Weyl spinor.
Finally, as an explicit example, we write the integrated charge density in
terms of the tomographic transformed bosonic degrees of freedom
Holography in flat spacetime: 4D theories and electromagnetic duality on the border
We consider a free topological model in 5D euclidean flat spacetime, built
from two rank-2 tensor fields. Despite the fact that the bulk of the model does
not have any particular physical interpretation, on its 4D planar edge
nontrivial gauge field theories are recovered, whose features are entirely
determined by the gauge and discrete symmetries of the bulk. In particular no
4D dynamics can be obtained without imposing a Time Reversal invariance in the
bulk. Remarkably, one of the two possible edge models selected by the Time
Reversal symmetries displays a true electromagnetic duality, which relates
strong and weak coupling regimes. Moreover this same model, when considered
on-shell, coincides with the Maxwell theory, which therefore can be thought of
as a 4D boundary theory of a seemingly harmless 5D topological model.Comment: 21 pages, plain LaTeX, no figures. Version to appear on JHE
Analytic DC thermo-electric conductivities in holography with massive gravitons
We provide an analytical derivation of the thermo-electric transport
coefficients of the simplest momentum-dissipating model in gauge/gravity where
the lack of momentum conservation is realized by means of explicit graviton
mass in the bulk. We rely on the procedure recently described by Donos and
Gauntlett in the context of Q-lattices and holographic models where momentum
dissipation is realized through non-trivial scalars. The analytical approach
confirms the results found previously by means of numerical computations.Comment: 9 pages, no figures, minor comments added, version to appear on PR
Thermo-electric transport in gauge/gravity models
In this review, we summarize recent results in the study of the thermo-electric transport properties of holographic models exhibiting mechanism of momentum dissipation. These models are of particular interests if applied to understand the transport mechanisms of strongly coupled condensed matter systems such as the high-temperature superconductors. After a brief introduction in which we point out the discrepancies between the experimentally measured transport properties of these materials and the prediction of the weakly coupled theory of Fermi Liquid, we will review the basic aspects of AdS/CFT correspondence and how gravitational models could help in understanding the peculiar properties of strongly coupled condensed matter systems
On the introduction of a boundary in topological field theories
We study the consequences of the presence of a boundary in topological field
theories in various dimensions. We characterize, univocally and on very general
grounds, the field content and the symmetries of the actions which live on the
boundary. We then show that these actions are covariant, despite appearances.
We show also that physically relevant theories like the 2D Luttinger liquid
model, or the 4D Maxwell theory, can be seen as boundary reductions of higher
dimensional topological field theories, which do not display local observables.Comment: 19 pages, no figures, comments added, results unchanged, version to
appear on PR
Therapeutic Value and Innovation of a Drug and Criteria for Evaluation: A Multidisciplinary Experience in the Veneto Region
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IKZF1/3 and CRL4-CRBN E3 ubiquitin ligase mutations and IMiD resistance in multiple myeloma
The work was supported by the Deutsche Forschungsgemeinschaft (KFO216), the IZKF, the
BTHA and the CDW Stiftung (KMK). UM was supported by a grant of the German Excellence
Initiative to the Graduate School of Life Sciences, University of Würzburg.S