evanb

17 ms·

211.
by evanb 3y ago
The theory they’re talking about is not just curve fitting. Instead only pieces which match the physics of QCD / the Standard Model Are included. It is simple to write down terms that you might include in a “just make up enough terms
212.
by evanb 3y ago
42nd Street between the Midtown and Lincoln tunnels is part of I-495. That's why the last exit on the westbound LIE is #15, Van Dam street. Exits 1-14 are the avenues from the west side of Manhattan (where the numbers reset because 4
213.
by evanb 3y ago
Another physicist here. > Also a countertop swivel chair physicist, my understanding is that Higgs bosons are recruited as virtual particles all the time to bestow other particles their mass. I think you're mixing up two subtle idea
214.
by evanb 3y ago
No professional physicist I know thinks natively with relativistic mass. They much prefer m to mean the rest mass, a relativistic invariant, and to include explicit factors of (v/c) or γ when they're talking about frame-dependent
215.
Primes and Primitive Sets: an Erdos Conjecture is cracked (2022) [video](youtube.com)
23 points by evanb 3y ago|1 comments
216.
by evanb 3y ago
Is what you're getting at the fact that the distance between the earth and the other object changes from two effects (the first being the ball falling towards the Earth and the second being the Earth falling towards the ball)? That&#x
217.
by evanb 3y ago
But this is not what anybody means when they talk about the equivalence principle.
218.
by evanb 3y ago
They do fall at the same rate, even with Newtonian gravity. For, F = m a F_gravity = GMm/r^2 so that ma = GMm/r^2. Now cancel m from both sides and get a = GM/r^2 If you plug in G=6.674e-11 m^3
219.
by evanb 3y ago
Tom Scott has a video. https://youtu.be/CcZdwX4noCE Why Web Filters Don't Work: Penistone and the Scunthorpe Problem
220.
by evanb 4y ago
Sure but what good would a nuclear sub at the center of a black hole be?
221.
by evanb 4y ago
The near / distant difference is something that's known to physicists but could be misleading to the public, as you have experienced. There is a long-standing question about the neutrino spectrum that comes out of reactors, the &q
222.
by evanb 4y ago
My reasons are - I'm a professional physicist and most people I know professionally think this way. People like symmetry, it helps clarify things, simplify things, provides powerful principles. If the cost is practical difficulties,
223.
by evanb 4y ago
It depends on if you're a mathematician interested in rigid transformations or if you manufacture ceramics.
224.
by evanb 4y ago
Yes, but you very quickly run out of steam. Moreover, we know the perturbative series does not converge for many theories. For QED, for example, the radius of convergence must be 0, by an argument due to Dyson. Roughly: 1. The perturbat
225.
by evanb 4y ago
Typically in physics we derive laws from principles. For example, the law of conservation of momentum is derived from the principle of translation invariance. Nobody calls the Standard Model a law, for example. The modern view is that the
226.
by evanb 4y ago
The kinds of physical influences that are allowed in Newtonian physics are more general than those allowed in relativity. Relativity requires physics to satisfy constraints . Which is more complex depends on what you mean. There are fewe
227.
by evanb 4y ago
People can calculate perturbative processes in QED. Some observables are known to 7 loops (!), last I paid attention.
228.
by evanb 4y ago
I played a lot of Mario Run at the beginning but ultimately stopped because it was absolutely infuriating that it required a network connection. This requirement made the game completely useless as a way to spend time on a subway or airpla
229.
by evanb 4y ago
I love Carcassonne but I've found I like it even better if you add the house rule of having a hand of 3 tiles, which allows a bit more strategy and planning.
230.
by evanb 4y ago
A good cartoon is that a form factor is the function that describes how an object deforms when exposed to an outside influence with a particular momentum. The form factor is a function of momentum. There are many different kinds of outside
231.
by evanb 4y ago
What makes particles travel long distances as lumps is that they are on-shell. Virtual particles are not on shell. https://en.wikipedia.org/wiki/On_shell_and_off_shell
232.
by evanb 4y ago
Some fields' conferences have refereed talks and posters, so it's not automatically suspicious. A prominent field where this is standard is computer science! Not sure about this particular instance, however.
233.
by evanb 4y ago
There have been many "hmm, that's odd from a Standard Model point of view". The only one that has definitely been verified is nonzero neutrino masses, which were easily incorporated into the SM. There are still many open pu
234.
by evanb 4y ago
Machine learning is good at statistical sampling, approximation, and categoriztion. Let's think about hash functions. Not inverting a hash, just applying one. - A hash function has a bit-perfect map between input and output, "clo
235.
by evanb 4y ago
CliffStoll, can you tell Brady from Numberphile that it's an internet crime to sit on a Numberphile video with you in it for 2+ years?! I loved the most recent small-business-oriented Numberphile, by the way :)
236.
by evanb 4y ago
My question was not a suggestion, it was a probe to understand the danger your project might pose.
237.
by evanb 4y ago
Have you asked it to try and break out of the sandbox?
238.
by evanb 4y ago
The turn-around time was a lot faster back then. To wit, Lee and Yang won in 1957; Wu's work was in 1956-57. Even today, experimental (rather than theoretical) work tends to get recognized a lot faster. For recent examples see LIGO,
239.
by evanb 4y ago
https://unitworkers.com/
240.
by evanb 4y ago
It's not a reactor because the radioactive elements are sparse enough that there's no chain reaction. It's more like an atomic battery. https://en.wikipedia.org/wiki/Atomic_battery

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