"As far as we know, entropy increases throughout the portion of the universe observable from Earth. It does not seem probable to us, but in any case nothing excludes, that beyond the particle horizon which marks the maximum limit of observations there exist regions in which the arrow of time is reversed compared to ours and in which entropy decreases. I dare not think of the theoretical and observational complications that would arise if the matter contained in one of these anomalous regions began to interact with ours."
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Ch. 8, p. 52
https://en.wikiquote.org/wiki/Tullio_Regge
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