<?xml version="1.0" encoding="UTF-8"?>
<rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom"><channel><title>Information Causality as a Physical Principle · HackerPapers discussions</title><link>https://hackerpaper.kaipfister.de/p/0905.2292/</link><description>Collected HN comments and submissions linking this paper.</description><language>en</language><lastBuildDate>Mon, 02 Nov 2026 11:16:22 GMT</lastBuildDate><atom:link href="https://hackerpaper.kaipfister.de/p/0905.2292/feed.xml" rel="self" type="application/rss+xml" /><item><title>Information Causality as a Physical Principle — mentioned by Udo</title><link>https://news.ycombinator.com/item?id=9771915</link><guid isPermaLink="false">urn:hackerpapers:mention:0905.2292:9771915</guid><pubDate>Wed, 24 Jun 2015 14:45:59 GMT</pubDate><description>&lt;p&gt;&amp;gt; No. We can take arbitrarily spaced &amp;quot;snapshots&amp;quot; of a closed system, and determine which was taken earlier by measuring entropy. That is not correct. A closed system may by convention still exchange energy with the outside (just not any matter). What you&amp;#x27;re really talking about is called an isolated system, which is a theoretical construct that does not occur in nature. Fundamentally, time, causality, and entropy are related, especially considering the idea of entropy as seen through a probabilistic lens with information causality in mind (see Pawlowski et al arXiv:0905.2292). However, I…&lt;/p&gt;&lt;p&gt;&lt;a href="https://hackerpaper.kaipfister.de/p/0905.2292/"&gt;Paper and discussion history&lt;/a&gt;. A mention is not an endorsement.&lt;/p&gt;</description><category>quant-ph</category></item></channel></rss>
