3 ms·
Parent is probably referencing https://en.wikipedia.org/wiki/Time_crystal https://en.wikipedia.org/wiki/Time_crystal Because a time crystal is a driven (i.e. op
by Jach 10y ago
Parent is probably referencing https://en.wikipedia.org/wiki/Time_crystal https://en.wikipedia.org/wiki/Time_crystal Because a time crystal is a driven (i.e. open) quantum system that is in perpetual motion, it does not violate the laws of thermodynamics... does not produce work...does not spontaneously convert thermal energy into mechanical work...cannot serve as a perpetual store of work... A time crystal has been said to be a perpetuum mobile of the fourth kind: it does not produce work and it cannot serve as a perpetual energy storage. But it rotates perpetually.
- fmihaila 10y ago> Parent is probably referencing https://en.wikipedia.org/wiki/Time_crysta https://en.wikipedia.org/wiki/Time_crysta Possibly, but that is not the meaning intended in the article, nor the usual meaning of the expression, so it's not relevant.
- roywiggins 10y agoIn theory I think a closed system undergoing completely reversible processes could be considered perpetual motion (being reversible, entropy never increases). The second law states that those are the only sorts of isolated systems that don't gain entropy over time. https://en.wikipedia.org/wiki/Second_law_of_thermodynamics https://en.wikipedia.org/wiki/Second_law_of_thermodynamics But time crystals aren't perpetual motion just by dint of not being closed systems at all, so they're kind of neither here nor there.
- deleted 10y ago[deleted]
- greghatch 10y ago> But time crystals aren't perpetual motion just by dint of not being closed systems at all, so they're kind of neither here nor there. Literally!
- jacobush 10y agoThat was the weirdest shit I've seen in a good while.