Causality in Dense Matter

TL;DR

This paper investigates whether non-causal signal propagation can occur in dense matter theories, analyzing causality definitions and spacetime interpretations through specific examples.

Contribution

It provides a detailed discussion of causality concepts and demonstrates how certain dense matter models satisfy or violate causality.

Findings

Some dense matter models violate causality

Causality depends on spacetime interpretation

Examples illustrate conditions for causal and non-causal behavior

Abstract

The possibility of non-causal signal propagation is examined for various theories of dense matter. This investigation requires a discussion of definitions of causality, together with interpretations of spacetime position. Specific examples are used to illustrate the satisfaction or violation of causality in realistic calculations.