objective macroscopic irreversibility

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Editorial synthesis · provisional

Definition

Objective macroscopic irreversibility is RB2’s account of real statistical asymmetries in large-scale processes, such as diffusion and heat flow, despite time-symmetric microscopic descriptions. The proposed entry distinguishes overwhelming practical directionality from a magical prohibition on reverse motion. It also preserves the additional organization required for memory and agency rather than deriving every temporal asymmetry directly from entropy increase.

Explanation

The egg and mixing examples explain why reverse arrangements are extraordinarily improbable rather than metaphysically forbidden. Statistical character does not make the macroscopic pattern merely a product of ignorance. The source locates directional regularity in the organization and accessible configurations of the system, not in an observer’s inability to name every detail.

Price’s caution separates this thermodynamic account from the asymmetric functions of records, explanation and intervention. An entropy gradient does not alone supply a memory or an agent. The entry retains that distinction instead of using one physical arrow as an automatic explanation of every psychological or biological phenomenon.

RB1’s temporary abstraction from an agent-centered viewpoint likewise distinguishes physical symmetry from experienced causal direction without erasing actual causal order. Its transactional ontology remains an interpretation rather than an experimental consequence of that abstraction. The proposal keeps the macroscopic statistical claim distinct from selecting a particular quantum-foundations account.

Scope and attribution

Keep macroscopic scope, statistical status and interpretation limits explicit.

RB1 — The Real Book, Volume I: The Possible Is Real

Perspective and microscopic symmetry do not independently establish transactional ontology.

Occurrence locators: 69, 221, 222.

RB2 — The Real Book, Volume II: Becoming Is Being

Statistical macroscopic direction is real without making reverse configurations logically impossible.

Occurrence locators: 215, 216, 217.

Background used in the editorial explanation

Macroscopic statistical irreversibility is distinguished from the interferometer-based reconstruction of RTI.