We consider the adiabatic limit of Hadamard states for free quantum Klein–Gordon fields, when the background metric and the field mass are slowly varied from their initial to final values. If the Klein–Gordon field stays massive, we prove that the adiabatic limit of the initial vacuum state is the (final) vacuum state, by extending to the symplectic framework the adiabatic theorem of Avron–Seiler–Yaffe. In cases when only the field mass is varied, using an abstract version of the mode decomposition method we can also consider the case when the initial or final mass vanishes, and the initial state is either a thermal state or a more general Hadamard state.

On the adiabatic limit of Hadamard states / Drago, Nicolò; Gerard, Christian. - In: LETTERS IN MATHEMATICAL PHYSICS. - ISSN 0377-9017. - 107:8(2017), pp. 1409-1438. [10.1007/s11005-017-0947-x]

On the adiabatic limit of Hadamard states

Drago, Nicolò;
2017-01-01

Abstract

We consider the adiabatic limit of Hadamard states for free quantum Klein–Gordon fields, when the background metric and the field mass are slowly varied from their initial to final values. If the Klein–Gordon field stays massive, we prove that the adiabatic limit of the initial vacuum state is the (final) vacuum state, by extending to the symplectic framework the adiabatic theorem of Avron–Seiler–Yaffe. In cases when only the field mass is varied, using an abstract version of the mode decomposition method we can also consider the case when the initial or final mass vanishes, and the initial state is either a thermal state or a more general Hadamard state.
2017
8
Drago, Nicolò; Gerard, Christian
On the adiabatic limit of Hadamard states / Drago, Nicolò; Gerard, Christian. - In: LETTERS IN MATHEMATICAL PHYSICS. - ISSN 0377-9017. - 107:8(2017), pp. 1409-1438. [10.1007/s11005-017-0947-x]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11572/330353
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