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Quantum charges and spacetime topology: The emergence of new superselection sectors
, 2008
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Massless scalar free Field in 1+1 dimensions II: Net Cohomology and . . .
, 2008
"... As an application of Roberts’ net cohomology theory, we positively answer about the completeness of the known set of DHR sectors of the observables of the model in the title, detailed in [7]. This result is achieved via the triviality of the 1cohomology of the underlying causal index poset with val ..."
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As an application of Roberts’ net cohomology theory, we positively answer about the completeness of the known set of DHR sectors of the observables of the model in the title, detailed in [7]. This result is achieved via the triviality of the 1cohomology of the underlying causal index poset with values in the field net, enhancing this tool for the case of Weyl nets not satisfying the split property and with anyonic commutation rules. We also take advantage of different causal index posets for the nets involved, and obtain the description of the twisted and untwisted sectors of the
A theory of bundles over posets
, 707
"... In algebraic quantum field theory the spacetime manifold is replaced by a suitable base for its topology ordered under inclusion. We explain how certain topological invariants of the manifold can be computed in terms of the base poset. We develop a theory of connections and curvature for bundles ove ..."
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In algebraic quantum field theory the spacetime manifold is replaced by a suitable base for its topology ordered under inclusion. We explain how certain topological invariants of the manifold can be computed in terms of the base poset. We develop a theory of connections and curvature for bundles over posets in search of a formulation of gauge theories in algebraic quantum field theory. 2
Net bundles over posets and Ktheory
, 802
"... We continue studying net bundles over partially ordered sets (posets), defined as the analogues of ordinary fibre bundles. To this end, we analyze the connection between homotopy, net homology and net cohomology of a poset, giving versions of classical Hurewicz theorems. Focusing our attention on Hi ..."
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We continue studying net bundles over partially ordered sets (posets), defined as the analogues of ordinary fibre bundles. To this end, we analyze the connection between homotopy, net homology and net cohomology of a poset, giving versions of classical Hurewicz theorems. Focusing our attention on Hilbert net bundles, we define the Ktheory of a poset and introduce functions over the homotopy groupoid satisfying the same formal properties as Chern classes. As when the given poset is a subbase for the topology of a space, our results apply to the category of locally constant bundles.
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"... Abstract: Private notes on open string field theory concerned with the question how classical solutions of OSFT correspond to deformations of worldsheet CFTs. JHEP 3.1 DRAFT () p8, June 24, 2004, 16:30 ..."
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Abstract: Private notes on open string field theory concerned with the question how classical solutions of OSFT correspond to deformations of worldsheet CFTs. JHEP 3.1 DRAFT () p8, June 24, 2004, 16:30