In causal fermion systems, spacetime points are reinterpreted as bundles of correlations among occupied fermion states, and, for a broad class including the Minkowski vacuum, the causal action equals the variance of the two-point correlation strength.
Relativistic Quantum Theory
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abstract
The purpose of this paper is to sketch an approach towards a reconciliation of quantum theory with relativity theory. It will actually be argued that these two theories ultimately rely on one another. A general operator-algebraic framework for relativistic quantum theory is outlined. Some concepts of space-time structure are translated into algebra. Following deep results of Buchholz et al., the key role of massless modes, photons and gravitons, and of Huygens' Principle in a relativistic quantum theory well suited to describe "events" and "measurements" is highlighted. In summary, a relativistic version of the "ETH Approach" to quantum mechanics is described.
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Causal Fermion Systems: Spacetime as the web of correlations of a many-body quantum system
In causal fermion systems, spacetime points are reinterpreted as bundles of correlations among occupied fermion states, and, for a broad class including the Minkowski vacuum, the causal action equals the variance of the two-point correlation strength.