Ron Maimon

45,521 reputation

248129

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	location	New York City
	age	39
visits	member for	1 year, 10 months
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I do not participate on this site any longer, except to respond to comments regarding my own text, if that text is unavailable in another form. I do not accept the political moderation atmosphere here, it is not compatible with open science.

	45,521 reputation	bio	website		visits	member for	1 year, 10 months
248129 badges		location	New York City		seen	36 mins ago

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Dec 2	revised	(Co)homology of the universe include black holes
Dec 2	comment	Is proper time renormalization gauge invariant? @TMS: The Schwinger representation is what people use these days--- I explained how to turn it into dim-reg. All perturbative regulators have a Schwinger interpretation which is easier. Continuing the dimension is a misleading way to say it, because the regulated integrals don't have to reproduce consistent other-dimension theories when you make $\epsilon$ an integer. Dimensional regularization, as any other Schwinger thing, is "gauge invariant" (meaning regulating charged particles doesn't introduce new gauge breaking terms), but remember that you need to fix the gauge on the vector.
Dec 2	comment	Euler equation of fluid dynamics @Anuar: Except it's so simple I don't think it needs Gauss or Ostrogradsky's names attached to it.
Dec 2	comment	On Parallel Transport @AnamitraPalit: I think you misunderstand parallel transport--- if you parallel transport a vector in flat space around a circle, it never changes direction. You are thinking that the changing direction of the curve leads to a changing direction for the transported vector, this is not so--- the vector tries to stay parallel to itself as best as possible while staying in the tangent plane to the sphere.
Dec 2	answered	What is the meaning of the word “particle” in particle physics?
Dec 2	answered	Euler equation of fluid dynamics
Dec 2	comment	Stroboscope-and-telegraph problem All you are asking is if when you have a blinker on a line, whether there is a minimum value of the observed time-between-blinks when you are moving along another line. This is a straightforward Doppler shift calculation (the answer is no, only asymptotically well after the two pass), but the question has not enough invested effort to simplify. I don't think this is a worthwhile question as it stands, why not ask "an emitted of frequency f is moving and an absorber is also moving. What is the observed frequency of the emitter by the observer?" This is straightforward and found in books.
Dec 2	answered	Cosmology questions from a novice
Dec 2	answered	Tensions And Pulleys With Masses
Dec 2	answered	Doubts with levers
Dec 2	comment	What is the best tool for simulating Vacuum and Fluids together? He's talking about cavitation.
Dec 2	answered	On Parallel Transport
Dec 2	answered	Is proper time renormalization gauge invariant?
Dec 2	comment	Does the Chandrasekhar Limit scale for a Black Hole? It isn't really true classically either. The singularity is either to your future, or matter can't hit it (depending on whether it is spacelike or timelike).
Dec 1	answered	(Co)homology of the universe
Dec 1	comment	Does the Chandrasekhar Limit scale for a Black Hole? The size of a black hole is it's event horizon radius. The singularity is not a point in space where matter is scrunched up. This is something people say all the time, it's not right. The matter collapsed in a black hole has turned into its event horizon from the point of view of the outside observer, by merging with it.
Dec 1	answered	Can bosons that are composed of several fermions occupy the same state?
Nov 30	comment	Why is cold fusion considered bogus? There are several possible reasons for "special conditions", you might need trace alpha-emitters on the cathode, which might vary from sample to sample or from the solution type, you might have different cosmic ray or background radioactivity, which might be the trigger, or it might be due to the required surface electric fields to concentrate the deuteron-k-shell hole into sufficient density to ignite the reaction. Who knows. Because people such as yourself have willfully prevented research the topic, there is very little that can be said definitively. But I am sure now my mechanism is right.
Nov 30	comment	Why is cold fusion considered bogus? You are confusing photons and charged particles. Photons must be tuned, charged particles produce keV holes with no tuning, this is Bethe formula ionization. The limitations to a band is that you need to concentrate the holes suffficiently in a region to allow fusion, this might require a strong surface electric field, concentrating the deuterons to allow d-d fusion (whose rate is quadratic in the d-density). You also need to seed the reaction, so you need some trace amount of charged particle radioactivity on the Pd. This is eventually inevitable, crud accumulates on the cathode.
Nov 29	comment	What is p_T? (transverse momentum?) @QuantumDot: It's harshness is accurate, the field theorists didn't understand S-matrix, and drove all the practitioners out of physics (including many early string giants). The theory was too sophisticated for the 1960s stoners, it's not baby-boom physics. Ask anna v for 1st hand experience. This stuff is now actually back in fasion, even Pomeron physics, so it is hard to remember the rejection. The hostility was everywhere (you can see it in Streater's "lost causes", Woit's "not even wrong", Gross personally told me when I asked him about N/D equations, his thesis! that it was tautology).