Must Time Machine Be Unstable against Vacuum Fluctuations?

TL;DR

This paper explores conditions under which time machines could be stable against quantum vacuum fluctuations, challenging the traditional view that physics prevents closed timelike curves from forming.

Contribution

It proposes that absorption materials can stabilize time machines by smoothing vacuum fluctuations, potentially invalidating the chronology protection conjecture.

Findings

Absorption materials can suppress vacuum fluctuations in time machine regions.

Stability of time machines may be achievable without violating physical laws.

The results suggest possible scenarios where closed timelike curves could exist.

Abstract

In the appearance of absorption material, the quantum vacuum fluctuations of all kinds of fields may be smoothed out and the spacetime with time machine may be stable against vacuum fluctuations. The chronology protection conjecture might break down, and the anti-chronology protection conjecture might hold: There is no law of physics preventing the appearance of closed timelike curves.