Causal Symmetry and the Transactional Interpretation

TL;DR

This paper analyzes the transactional interpretation of quantum mechanics, critiques Maudlin's objections, and argues that the core issue is the lack of causal symmetry rather than retrocausality itself.

Contribution

It offers a new perspective on the transactional interpretation by identifying causal symmetry as essential for its consistency, challenging Maudlin's critique.

Findings

Transactional interpretation lacks sufficient causal structure.

Causal symmetry is crucial for constraining quantum behavior.

Maudlin's critique misattributes the core issue.

Abstract

Cramer's (1986) transactional interpretation of quantum mechanics posits retrocausal influences in quantum processes in an attempt to alleviate some of the interpretational difficulties of the Copenhagen interpretation. In response to Cramer's theory, Maudlin (2002) has levelled a significant objection against any retrocausal model of quantum mechanics. I present here an examination of the transactional interpretation of quantum mechanics and an analysis of Maudlin's critique. I claim that, although Maudlin correctly isolates the weaknesses of Cramer's theory, his justification for this weakness is off the mark. The cardinal vice of the transactional interpretation is its failure to provide a sufficient causal structure to constrain uniquely the behaviour of quantum systems and I contend that this is due to a lack of causal symmetry in the theory. In contrast, Maudlin attributes this shortcoming to retrocausality itself and emphasises an apparently fundamental incongruence between retrocausality and his own metaphysical picture of reality. I conclude by arguing that the problematic aspect of this incongruence is Maudlin's assumptions about what is appropriate for such a metaphysical picture.