paper

Yet More Ado About Nothing: The Remarkable Relativistic Vacuum State

arXiv:0802.1854

Abstract

An overview is given of what mathematical physics can currently say about the vacuum state for relativistic quantum field theories on Minkowski space. Along with a review of classical results such as the Reeh--Schlieder Theorem and its immediate and controversial consequences, more recent results are discussed. These include the nature of vacuum correlations and the degree of entanglement of the vacuum, as well as the striking fact that the modular objects determined by the vacuum state and algebras of observables localized in certain regions of Minkowski space encode a remarkable range of physical information, from the dynamics and scattering behavior of the theory to the external symmetries and even the space--time itself. These modular objects also provide an intrinsic characterization of the vacuum state itself, a fact which is of particular relevance to the search for criteria to select physically significant reference states for quantum field theories on curved space--times.

This is an expanded version of an invited talk given at the Symposium "Deep Beauty: Mathematical Innovation and the Search for an Underlying Intelligibility of the Quantum World", held at Princeton University on October 3-4, 2007. 28 pages ; minor revisions made

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