Abstract:Given a pair of normally hyperbolic operators over (possibnly different) globally hyperbolic spacetimes on a given smooth manifold, the existence of a geometric isomorphism, called Møller operator, between the space of solutions is studied. This is achieved by exploiting a new equivalence relation in the space of globally hyperbolic metrics, called paracausal relation. In particular, it is shown that the Møller operator associated to a pair of paracausally related metrics and normally hyperbolic operators also… Show more
“…Proof of Theorem 1.1. Let t be a Cauchy temporal function for g and define g u := −dt 2 + h, where h is a complete Riemannian metric on t −1 (s) for every s ∈ R. On account of [64,Proposition 2.23], there exists a globally hyperbolic metric g such that J + g ⊂ J + gu ∩ J + g . Denote with SM g the spinor bundle over (M, g) and consider the linear isometries…”
The aim of this paper is to prove the existence of Hadamard states for Dirac fields coupled with MIT boundary conditions on any globally hyperbolic manifold with timelike boundary once a suitable propagation of singularities theorem is assumed. To this avail, we consider particular pairs of weakly-hyperbolic symmetric systems coupled with admissible boundary conditions. We then prove the existence of an isomorphism between the solution spaces to the Cauchy problems associated with these operators -this isomorphism is in fact unitary between the spaces of L 2 -initial data. In particular, we show that for Dirac fields with MIT boundary conditions, this isomorphism can be lifted to a * -isomorphism between the algebras of Dirac fields and that any Hadamard state can be pulled back along this * -isomorphism preserving the singular structure of its two-point distribution.
“…Proof of Theorem 1.1. Let t be a Cauchy temporal function for g and define g u := −dt 2 + h, where h is a complete Riemannian metric on t −1 (s) for every s ∈ R. On account of [64,Proposition 2.23], there exists a globally hyperbolic metric g such that J + g ⊂ J + gu ∩ J + g . Denote with SM g the spinor bundle over (M, g) and consider the linear isometries…”
The aim of this paper is to prove the existence of Hadamard states for Dirac fields coupled with MIT boundary conditions on any globally hyperbolic manifold with timelike boundary once a suitable propagation of singularities theorem is assumed. To this avail, we consider particular pairs of weakly-hyperbolic symmetric systems coupled with admissible boundary conditions. We then prove the existence of an isomorphism between the solution spaces to the Cauchy problems associated with these operators -this isomorphism is in fact unitary between the spaces of L 2 -initial data. In particular, we show that for Dirac fields with MIT boundary conditions, this isomorphism can be lifted to a * -isomorphism between the algebras of Dirac fields and that any Hadamard state can be pulled back along this * -isomorphism preserving the singular structure of its two-point distribution.
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