Sean Carroll on Twitter: "Worth pointing out that my discussion of quantum fluctuations betrays my Everettian (many-worlds) sympathies. Your mileage may vary. #qf"

Country	Code	For customers of
United States	40404	(any)
Canada	21212	(any)
United Kingdom	86444	Vodafone, Orange, 3, O2
Brazil	40404	Nextel, TIM
Haiti	40404	Digicel, Voila
Ireland	51210	Vodafone, O2
India	53000	Bharti Airtel, Videocon, Reliance
Indonesia	89887	AXIS, 3, Telkomsel, Indosat, XL Axiata
Italy	4880804	Wind
3424486444	Vodafone
» See SMS short codes for other countries

Sean Carroll ‏@seanmcarroll Jan 16

Boltzmann Fluctuations are basically classical: random motions of things lead to unlikely events, even in equilibrium. #qf
12 retweets 18 likes
Sean Carroll ‏@seanmcarroll Jan 16

The *macro*state of a system can be static (equilibrium), but stuff is churning beneath the surface. That allows Boltzmann fluctuations. #qf
9 retweets 15 likes
Sean Carroll ‏@seanmcarroll Jan 16

Vacuum Fluctuations are the differences b/w quantum and classical states. Classically-definite observables can have a quantum variance. #qf
8 retweets 12 likes
Sean Carroll ‏@seanmcarroll Jan 16

Zero-point energy, virtual particles, the Lamb shift -- all due to vacuum fluctuations. But notice something important... #qf
5 retweets 12 likes
Sean Carroll ‏@seanmcarroll Jan 16

Nothing actually "fluctuates" in vacuum fluctuations! The system can be perfectly static. Just that quantum states are more spread out. #qf
8 retweets 21 likes
Sean Carroll ‏@seanmcarroll Jan 16

Measurement Fluctuations are the bridge b/w Boltzmann and Vacuum fluctuations. They occur when you repeatedly observe a quantum system. #qf
4 retweets 15 likes
Sean Carroll ‏@seanmcarroll Jan 16

By itself, a system can be static, but observational outcomes are probabilistic. Observe over and over again, get different results. #qf
6 retweets 19 likes
Sean Carroll ‏@seanmcarroll Jan 16

That makes us confuse (static) vacuum fluctuations with (dynamical) Boltzmann fluctuations. We think what we see is what really is. #qf
5 retweets 15 likes
Sean Carroll ‏@seanmcarroll Jan 16

But quantum mechanics says that what really exists is very different from what we see. In an atom, electrons aren't fluctuating at all. #qf
15 retweets 18 likes
Sean Carroll ‏@seanmcarroll Jan 16

All of which is crucial for understanding Boltzmann Brains. A topic for another day. For more see: http://arxiv.org/abs/1505.02780 #qf
14 retweets 44 likes