evanb

59 ms·

691.
by evanb 9y ago
There has been an enormous resurrection of the analytic bootstrap. Grep, for example, https://www.icts.res.in/program/NUMSTRINGS2018/talks for bootstrap. The difference is the realization that the bootstrap equa
692.
by evanb 9y ago
There's been a lot of progress nonperturbatively defining quantum mechanics and quantum field theory using resurgence lately. See, for example, the very recent https://arxiv.org/abs/1802.10441
693.
by evanb 9y ago
It's also only valid classically. Quantum-mechanically we expect to generate photon-photon interaction terms (the leading piece is light-by-light). Essentially, two photons have an interaction moderated by the virtual charged particl
694.
by evanb 9y ago
> There are roughly two usecases where you might want to use a VPN: > > You are on a known-hostile network (eg. a public airport WiFi access point, or an ISP that is known to use MITM), and you want to work around that. I think
695.
by evanb 9y ago
This must be heaven -- Tonight I crossed the line. You must be the angel I thought I'd never find. Was it you I heard singin' While I was chasin' dreams? Driven by the wind, Like the dust th
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by evanb 9y ago
I could listen to the plotter go for hours.
697.
by evanb 9y ago
"happen" has a verb sense meaning "to encounter by chance" when followed by "on" or "upon", so "happened" is grammatically and idiomatically correct. All the other ones are weird, though :
698.
by evanb 9y ago
I had to disable tracking protection in firefox to see anything except the first three lines.
699.
by evanb 9y ago
You need to draw some triangles and relate b to w. Assuming a still, straight shore, the answer will depend on your distance to the waterline, the ball's distance to the waterline, and the distance parallel to the shore separating you
700.
by evanb 9y ago
Clicking on "Screenshots" at the very top doesn't take me anywhere. (Also, a minor typo: "Documentations" should singular, "Documentation").
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Cloud Quantum Computing of an Atomic Nucleus(arxiv.org)
1 points by evanb 9y ago|0 comments
702.
No Conflict Between Lack of Evidence of String Theory and Work Being Done on It(thewire.in)
1 points by evanb 9y ago|0 comments
703.
by evanb 9y ago
Nothing makes me crazier than seeing hyphen1 in TeX documents. hyphen != minus!
704.
by evanb 9y ago
This can be fixed with a more reliable integrator, at the expense of computational speed.
705.
by evanb 9y ago
There's Grid https://github.com/paboyle/grid , which is a general data-parallel code in development with the help of Intel. And there's the USQCD software stack http://usqcd-software.github.io&#x2
706.
by evanb 9y ago
For an accurate double pendulum you almost certainly need a symplectic integrator---not just Euler's method---or risk numerical instabilities that come from nonconservation of energy.
707.
by evanb 9y ago
There's another story about Feynman, somewhat related to this issue. He had worked out the V-A structure of the weak force which had been an outstanding puzzle for some time. At some later point he was visiting CERN and they during t
708.
by evanb 9y ago
I came across an article on a disappearing Greek whistled language earlier this year: http://www.bbc.com/travel/story/20170731-greeces-disappearin...
709.
by evanb 9y ago
New Parkway also screens episodes of MST3K, it's quite a fun audience.
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by evanb 9y ago
Ah, well that was my one idea :P It's also hard in that: once I have one awesome Japanese stapler, how many more do I need? For me the answer was just 1: a staple-free stapler. Then I was saturated.
711.
by evanb 9y ago
You mention you haven't expanded. Have you considered also doing Japanese stationery / office supplies? All the best tools I've got came from my one trip to Japan :)
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by evanb 9y ago
https://99percentinvisible.org/episode/person-lotus-position...
713.
by evanb 9y ago
No reason not to have one for each IPA character.
714.
by evanb 9y ago
You could actually propose a whole set of Unicode characters that are making realistic-for-lip-reading movements.
715.
by evanb 9y ago
It depends on the computational step. Often we "just" need to compute the determinant, in which case we use a trick. In some other cases, we do only need linear solves. Exact inversion of the whole thing is often prohibitive.
716.
by evanb 9y ago
I'm going to put in some explanations of things that it sounds like you already know, for the sake of any other readers. One way of calculating observables in quantum field theory is by performing a path integral. That is, an integral
717.
by evanb 9y ago
In your example one writes 0.123(4). I don't know what the notation is called, but it's discussed here: https://en.wikipedia.org/wiki/Uncertainty#Measurements
718.
by evanb 9y ago
LQCD is approximation-free, once you take the continuum and infinite-volume limits (if you're operating with physical parameters). But I obviously agree that large-scale universal quantum computers (or even specialized quantum emulato
719.
by evanb 9y ago
Depending on when you went to college, you may be thinking of the proton radius puzzle https://en.wikipedia.org/wiki/Proton_radius_puzzle which (to gloss over an enormous amount of detail) amounts to tension between tw
720.
by evanb 9y ago
It is due to computing resources. LQCD calculations consume a large fraction of all the world's supercomputing, and there's never enough to go around. The procedure is essentially an evaluation of a millions-of-dimensions-large i

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