21 research outputs found
Unitary Positive-Energy Representations of Scalar Bilocal Quantum Fields
The superselection sectors of two classes of scalar bilocal quantum fields in
D>=4 dimensions are explicitly determined by working out the constraints
imposed by unitarity. The resulting classification in terms of the dual of the
respective gauge groups U(N) and O(N) confirms the expectations based on
general results obtained in the framework of local nets in algebraic quantum
field theory, but the approach using standard Lie algebra methods rather than
abstract duality theory is complementary. The result indicates that one does
not lose interesting models if one postulates the absence of scalar fields of
dimension D-2 in models with global conformal invariance. Another remarkable
outcome is the observation that, with an appropriate choice of the Hamiltonian,
a Lie algebra embedded into the associative algebra of observables completely
fixes the representation theory.Comment: 27 pages, v3: result improved by eliminating redundant assumptio
Globally conformal invariant gauge field theory with rational correlation functions
Operator product expansions (OPE) for the product of a scalar field with its
conjugate are presented as infinite sums of bilocal fields V_k (x_1, x_2) of
dimension (k,k). For a {\it globally conformal invariant} (GCI) theory we write
down the OPE of V_k into a series of {\it twist} (dimension minus rank) 2k
symmetric traceless tensor fields with coefficients computed from the
(rational) 4-point function of the scalar field.
We argue that the theory of a GCI hermitian scalar field L(x) of dimension 4
in D = 4 Minkowski space such that the 3-point functions of a pair of L's and a
scalar field of dimension 2 or 4 vanish can be interpreted as the theory of
local observables of a conformally invariant fixed point in a gauge theory with
Lagrangian density L(x).Comment: 32 pages, LATEX, amssym
Higher-Spin Theory and Space-Time Metamorphoses
Introductory lectures on higher-spin gauge theory given at 7 Aegean workshop
on non-Einstein theories of gravity. The emphasis is on qualitative features of
the higher-spin gauge theory and peculiarities of its space-time
interpretation. In particular, it is explained that Riemannian geometry cannot
play a fundamental role in the higher-spin gauge theory. The higher-spin
symmetries are argued to occur at ultra high energy scales beyond the Planck
scale. This suggests that the higher-spin gauge theory can help to understand
Quantum Gravity. Various types of higher-spin dualities are briefly discussed.Comment: 37 pages, no figures; V2: references adde
Fine mapping of ZNF804A and genome-wide significant evidence for its involvement in schizophrenia and bipolar disorder
Fine mapping of ZNF804A and genome-wide significant evidence for its involvement in schizophrenia and bipolar disorder
Fine mapping of ZNF804A and genome-wide significant evidence for its involvement in schizophrenia and bipolar disorder
The best of both worlds: combining lineage specific and universal bait sets in target-enrichment hybridization reactions
PREMISE: Researchers adopting target-enrichment approaches often struggle with the decision of whether to use universal or lineage-specific probe sets. To circumvent this quandary, we investigate the efficacy of a simultaneous enrichment by combining universal probes and lineage-specific probes in a single hybridization reaction, to benefit from the qualities of both probe sets with little added cost or effort.METHODS AND RESULTS: Using 26 Brassicaceae libraries and standard enrichment protocols, we compare results from three independent data sets. A large average fraction of reads mapping to the Angiosperms353 (24–31%) and Brassicaceae (35–59%) targets resulted in a sizable reconstruction of loci for each target set (x̄ ≥ 70%).CONCLUSIONS: High levels of enrichment and locus reconstruction for the two target sets demonstrate that the sampling of genomic regions can be easily extended through the combination of probe sets in single enrichment reactions. We hope that these findings will facilitate the production of expanded data sets that answer individual research questions and simultaneously allow wider applications by the research community as a whole.NaturalisPlant science