evanb

46 ms·

541.
Huawei Official Acknowledges Ability to Clandestinely Access Mobile Networks(lawfareblog.com)
10 points by evanb 7y ago|5 comments
542.
by evanb 7y ago
I am a physicist, and minimum is correct. Quantum uncertainty is not an entropy measure. Importantly, the 'minimum uncertainty' is not just about the width of the wavefunction in position space---the uncertainty principle (roughl
543.
Periodic activity from a fast radio burst source(arxiv.org)
1 points by evanb 7y ago|0 comments
544.
by evanb 7y ago
Also: https://www.theonering.net/torwp/2020/01/16/107518-christoph...
545.
Christopher Tolkien, Architect of JRR Tolkein’s Middle Earth, 1924-2020(tor.com)
2 points by evanb 7y ago|1 comments
546.
by evanb 7y ago
Get up early and get in line at the court early. The calendar is available https://www.supremecourt.gov/
547.
by evanb 7y ago
Russell's hope was to establish that one could find proof of all true mathematical statements, so that one needed a fixed-for-all-time set of axioms and nothing more. Incompleteness obviously destroys that hope.
548.
by evanb 7y ago
That museum in Porthcurno is SO INTERESTING. History and hands-on demos and then bam! here's how the big boys did it during the war. Industrially. In a cave. Very neat.
549.
by evanb 7y ago
Gravity might have extra dimensions on a much larger scale than that, potentially up to the millimeter scale or so.
550.
by evanb 7y ago
That's a short-distance effect, though, not a long-distance one.
551.
by evanb 7y ago
For radiation, yes. But for force laws, having a massless carrier is critical for an inverse-square law. With massive carriers (like the carriers of the weak force, W+Z bosons) the range of the force scales like 1/M; the force law is
552.
by evanb 7y ago
On long distances, anyway. The evidence for inverse square laws over short distance is much weaker, and so there is room for curled-up "extra dimensions" we sometimes hear about, both in extensions to the standard model and in st
553.
by evanb 7y ago
The photons (let's say) that cause the inverse square law of the E+M force aren't on-shell photons [on-shell]. So, they're not photons that are "traveling" or are "emitted" in the same way that radiation
554.
Nauty and Traces – Graph Canonical Labelling and Automorphism Group Computation(pallini.di.uniroma1.it)
3 points by evanb 7y ago|0 comments
555.
by evanb 7y ago
Also, (1945).
556.
by evanb 7y ago
Presumably in most other places with municipal water infrastructure too!
557.
by evanb 7y ago
It's hard to dump the water company.
558.
by evanb 7y ago
Importantly, the Hamiltonian formulation of classical mechanics has symplectic form, with the conjugate variables (position, momentum) making up the dimensions.
559.
Greensboro Man Creates Dating App Where He's the Only Guy Allowed(wfmynews2.com)
344 points by evanb 7y ago|392 comments
560.
by evanb 7y ago
This is relatively standard notation. To be very attentive during an exercise in Lagrangian-formulated quantum mechanics you had better make sure to dot your qs and cross your hs.
561.
by evanb 7y ago
We can detect the CMB which, using the Stefan-Boltzmann law [s-b] and a CMB temperature of 2.725 K, is about 3.12e-6 Watts/square meter. But, the CMB is pervasive. The blackbody sphere you're asking about is very far away, and t
562.
by evanb 7y ago
Light does not have relativistic mass, but it does carry energy. The full version of Einstein's famous equation is E^2 = m^2c^4 + p^2c^2; a photon has m=0, so E=pc.
563.
by evanb 7y ago
Also Jenny and her sister are twins---8675309 and 8675311 are prime.
564.
by evanb 7y ago
I've been trying to get it to catch on, to little avail! Maybe I need to render it as Boh[e]mian? I feel like that gives it away!
565.
by evanb 7y ago
The issue then becomes the difficulty of enjoying a Bohmian lifestyle when trying to formulate a relativistic, many-body, QFT.
566.
by evanb 7y ago
Please see my other comment in this thread, especially the part about "occupying space"---the issue is exactly the same with mass.
567.
by evanb 7y ago
> the wave is something separate from the object but is related to it. This is a common idea in Bohmian epistemology, but, speaking as a professional physicist, I don't think most physicists would hold this position. The wave is th
568.
by evanb 7y ago
The "at some point" doesn't have to do with time. It has to do with the rest of the wavefunction of the universe. If the atom becomes entangled with everything else (in fact, a single quantum-mechanical spin suffices) the t
569.
by evanb 7y ago
You should be careful to not overstate it's rigorous application to QGP or condensed matter systems though. For example, for QGP, holography can paint a nice picture, but we don't know a holographic dual for Nc=3 QCD.
570.
by evanb 7y ago
But we've already found half the particles!

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