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Finitary Spacetime Sheaves of Quantum Causal Sets: Curving Quantum Causality
Authors:A. Mallios  I. Raptis
Affiliation:(1) Algebra and Geometry Section, Department of Mathematics, University of Athens, Panepistimioupolis 157 84, Athens, Greece;(2) Department of Mathematics, University of Pretoria, Pretoria 0002, Republic of South Africa
Abstract:A locally finite, causal, and quantal substitute for a locally Minkowskian principal fiber bundle 
$$mathcal{P}$$
of modules of Cartan differential forms OHgr over a bounded region X of a curved Cinfin-smooth spacetime manifold M with structure group G that of orthochronous Lorentz transformations L+ := SO(1,3)uarr, is presented. 
$$mathcal{P}$$
is usually regarded as the kinematical structure of classical Lorentzian gravity when the latter is viewed as a Yang-Mills type of gauge theory of a sl(2, {Copf})-valued connection 1-form 
$$mathcal{A}$$
. The mathematical structure employed to model this replacement of 
$$mathcal{P}$$
is a principal finitary spacetime sheaf 
$$overrightarrow mathcal{P} _n $$
of quantum causal sets 
$$overrightarrow {Omega _n } $$
with structure group Gn, which is a finitary version of the continuous group G of local symmetries of General Relativity, and a finitary Lie algebra gn-valued connection 1-form 
$$overrightarrow {mathcal{A}_n }$$
on it, which is a section of its subsheaf 
$$overrightarrow Omega  _n^1 $$
. 
$$mathcal{A}_n $$
is physically interpreted as the dynamical field of a locally finite quantum causality, whereas its associated curvature 
$$mathcal{F}_n $$
as some sort of ldquofinitary and causal Lorentzian quantum gravity.rdquo
Keywords:
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