Principle of relativity for quantum theory

TL;DR

This paper explores how quantum theory allows for observer-dependent causal and chronological ordering of events, contrasting with classical relativistic physics where only causal order is observer-independent.

Contribution

It introduces a framework where quantum theory treats both causal and chronological orderings as observer-dependent, extending the principles of relativity to quantum phenomena.

Findings

Quantum theory permits observer-dependent causal ordering.

Chronological ordering can also be observer-dependent in quantum contexts.

The work bridges concepts between relativity and quantum mechanics.

Abstract

In non relativistic physics it is assumed that both chronological ordering and causal ordering of events (telling whether there exists a causal relationship between two events or not) are absolute, observer independent properties. In relativistic physics on the other hand chronological ordering depends on the observer who assigns space-time coordinates to physical events and only causal ordering is regarded as an observer independent property. In this paper it is shown that quantum theory can be considered as a physical theory in which causal (as well as chronological) ordering of probabilistic events happening in experiments may be regarded as an observer dependent property.