Recent content by renormalize

The following is taken from Bjorken and Drell, Relativistic Quantum Mechanics (1964), pp. 5-6: So the problem with the Klein-Gordon equation is not that its "probability" four-current ##\left(i\hslash/2mc^{2}\right)\left(\psi^{\ast}\partial_{\mu}\psi-\psi\partial_{\mu}\psi^{\ast}\right)##...

You keep pointing to contrary "observations". To support that claim, please cite a scholarly reference that exhibits what is observed experimentally for the configuration you are discussing.

@kodama, I recommend taking a look at this paper from 2017: K. Krasnov & R. Percacci, Gravity and Unification: A review (https://arxiv.org/abs/1712.03061v1) From the abstract: "We review various classical unified theories of gravity and other interactions that have appeared in the literature...

Are you sure? The idealized version of "the power is turned on" is a step-function in time, which contains Fourier components with arbitrarily high frequency.

Good catch. To eliminate solution triples that are integer multiples of other triples I must verify that either ##b## or ##x## (or both) are prime. (My code in post #32 only tested for ##x## being prime.) Here is the corrected table of solutions: The table now includes the previously missed...

@Charles Link, given that ##a\geq1,b\geq1##, you can solve your formula ##(a+2b)^2=3(4x^2-a^2)## to get ##x=\sqrt{a^{2}+ab+b^{2}}/\sqrt{3}\,##. I thought it might be fun to write a couple of lines of Mathematica code to step through the integers ##1\leq a\leq100,a\leq b\leq100## and list all...

The poster says they want software to do "numerical relativity, inspirals &ct".

Agreed, one could modify a standard two-terminal light socket to accommodate a ground terminal and make an adapter that would then provide a ground to a 3-prong/polarized outlet. But the intent of my post #15 was simply to point out that it's quite unlikely that the commercial adapters shown in...

OK, that's a fair observation. But for those sockets, to which terminal would it be proper to connect a green (in the US) ground wire? And since the adapters shown in post #14 only appear to have two contacts (an outer threaded one and a centered smooth one) how can that ground be passed through...

I don't think those modern adapters have a ground wire either. I've never seen a light socket that could accommodate any additional wire connections beyond hot and neutral. After all, light sockets are intended for standard E26 light bulbs, none of which have a ground connection.

Or perhaps curtain folds?

No, what you actually said was: (Emphasis added.) So please clarify: how big must must a parabolic dish be to receive astronomical 21cm signals?

Welcome to Physics Forums, but please note that requesting such a discussion violates the rules you agreed to follow when you joined our forum, specifically: Speculative or Personal Theories: Physics Forums is not intended as an alternative to the usual professional venues for discussion and...

Alas, I missed it due to a scheduling conflict. Did anyone else hop on the Zoom meeting?

How about integrating Faraday's law ##\nabla\times\vec{E}=-\frac{\partial\vec{B}}{\partial t}## w.r.t. time ##t## to get ##\vec{B}=-\int\nabla\times\vec{E}\,dt\,##?