Negative Mass & the Arrow of Time

What Einstein Missed, Part 2 — extension of the Spacetime Traversal Velocity Hypothesis

Mass = Time Entropy Reversal Sequel to Part 1

I wanted to break entropy. In the Parkinson's essay I named it as the wall behind aging and neurodegeneration, then stopped. The label didn't lower the wall. I went to sleep. When I woke, negative mass had surfaced. The question was simple: if mass is the origin of time, what does negative mass produce? Four angles follow. Negative mass creates negative time. That is a physical mechanism for entropy reversal. Experimental effective negative mass already exists (2017 WSU BEC, 2018 Rochester polariton, 2025 Bormashenko). Time travel as cognitive integrity preservation. This essay does not claim proof — it proposes structural extensions of the Spacetime Traversal Velocity Hypothesis, drawing out a direction toward which future physics can test.

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Negative Mass Creates Negative Time

If mass is the origin of time (Part 1), then the sign of mass determines the sign of time. Light (zero mass) experiences no time — mass and time scale together. Cross zero into negative mass, and time itself runs backward in that region.

A Physical Mechanism for Entropy Reversal

Entropy direction is time direction. If the sign of mass sets the sign of time, then it sets the sign of entropy. Negative mass regions are not merely local entropy decreases (as in a refrigerator) but fundamental reversal — disorder returning to order, dispersed energy recondensing, old cells becoming young.

Effective Negative Mass Already Exists

Experimentally realized, 2017 onward: Washington State University's Bose-Einstein condensate rubidium showed negative-mass behavior. Rochester's 2018 polariton system. Bormashenko 2025's polymer-entropy-force configurations. True gravitational negative mass is still never observed, but the door is open — and the research direction is defined.

Time Travel as Identity-Layer Preservation

Standard “physical time travel” runs into paradox because it assumes wholesale translation of a body. This essay proposes a different frame: what travels is not matter but the cognitive integrity of the observer. The body ages forward in our layer; the identity traverses layers. Paradox dissolves because there's nothing to change in the other layer — only to witness.

Unified with Existing Work

Farnes' 2018 dark energy-dark matter unification via negative-mass fluid. 2024 DESI BAO + CMB joint analysis hinting at negative neutrino mass sum. ALPHA at CERN 2023 ruling out antimatter as negative gravitational mass. This essay is not in conflict with any of them — it sits structurally above, giving them a single thread.

A Sequel That Completes Part 1

Part 1 proposed gravity = velocity, mass = the source of time, layered spacetime, observer-dependent time. Part 2 extends that architecture to account for time's direction, entropy's direction, and a structural possibility of passage across time-layers. Together they form the Spacetime Traversal Velocity Hypothesis as a single framework.