Abstract

Arguments for a two boundary theory are briefly outlined. Plausible concepts of how in such a theory an approximate causal macroscopic theory can emerge are presented. A problem with simple implementations of the two boundary theory is that effective or real willful decisions can not be added as there is no consecutive macroscopic time ordering. In this letter, we present a somewhat drastic but beautiful way to avoid it.

Highlights

  • Quantum dynamics is a non-relativistic limit of relativistic quantum field theory most likely with local interactions and must be considered as such

  • Present-day physics is described by pure quantum dynamics and deciding measurements appear only in the end

  • The elephant in the room is how something like a macroscopic description can emerge in such two boundary quantum dynamics

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Summary

Two Boundary Quantum Dynamics

Quantum dynamics (quantum mechanics without measurement jumps [1]) is a non-relativistic limit of relativistic quantum field theory most likely with local interactions and must be considered as such. A setting chosen at a time t can enhance or reduce the size of an interference contribution and its consequences are lying in the future and the past. The interference contribution can have a positive value and the process is statistically enhanced In this situation the change in the setting reducing or eliminating the interference contribution can be done, say, one light-year away from the emitting star. The final collapse or jump part is the actual measurement It seemingly random-selects one component, eliminates the not chosen contribution (i.e., to apply a projection operator), and renormalizes probabilities. The deciding part of the measurement, the projection operator M, is postponed to the end of the interval, i.e., to tfinal, relying on available witnesses This basic concept can be written in a more symmetric form. With the caveat that one might have to go back to density matrices, we will use in the following this simpler formulation

The Emerging Macroscopic Dynamics
No Classical Backward Causation
The Breaking of the Time Symmetry
Consecutive Willful Decisions
Conclusions
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