Timeline of the far future
&gt; Current data suggest that the universe has a flat geometry (or very close to flat), and thus, will not collapse in on itself after a finite time, and the infinite future allows for the occurrence of a number of massively improbable events, such as the formation of Boltzmann brains.<p>I always thought that the universe will just reach zero Kelvin and the party is over. That it will just continue to do improbable stuff was beyond my imagination. I don&#x27;t really understand how it should be possible that effects like the emergence of virtual particles still work if all the energy is now in a form which can&#x27;t be used for energy transformations anymore (entropy) - I know that annihilation of anti-particles of virtual particles (which causes them to exist - that was the amazing finding of Hawking with the Hawking radiation where the anti-particles of virtual particles get annihilated at the event horizon and his counterpart is happily living on because he got lucky that he wasn&#x27;t too close) is a way to form new particles &quot;out of nothing&quot; (using quantum effects), but I still can&#x27;t believe that this still works when <i>nothing&#x27;s moving because we&#x27;re at absolute zero</i>.<p>Could someone explain why those quantum effects still continue to work (and sometimes even spawn particles and even brains if we get lucky) even if the universe is at absolute zero?