31,863 reputation
341103
bio website inspirehep.net/…
location Duchy of Grand Fenwick
age 43
visits member for 3 years, 8 months
seen 5 hours ago

Experimental nuclear and particle physicist. These days I'm teaching, but I've spent a lot of time on nucleon structure in fixed target electron scattering and neutrino oscillations using reactors and beam sources.


2d
comment The physical definition of work seems paradoxical
In point of fact your muscle tissue is doing work when you strain against a immobile object (because individual fibers are contracting and relaxing), but all that energy goes into heat instead of into a larger scale mechanical change.
2d
comment Why does a minor vertical vibration cause my coffee to spill?
Have you tried different speeds? I ask because it could provide a hint. If changing speeds helps it may well be a resonance effect.
2d
comment Mathematical model that allows the existence of an infinite number of smallest, but different particles
@HolgerFiedler "Quarks are well defined with their energy," No they are not. They come in a range of energies (all energies if you include the virtual contribution). What is defined (sort of) is their masses, and the mass of a photon is also defined (it happens to be zero).
2d
comment How to survive a lightning strike
This might be better on Skeptics. At first blush each element of the advice is reasonable, but without measurements and statistics there is little more that this physicist can say from first principles. Be aware that even a near miss can leave you pretty messed up.
2d
comment Do the laws of physics that apply to all observers also apply to a non-observer?
At this point you are not even wrong. Your wanting to impose your interpretation on the words that physicists use is pointless, because when we use those words they take the sense that we mean. Relativistic physics works. That's the final test from which there is no appeal.
2d
comment Peaks and dips position in the Planck CMB
They may not publish those values exactly; I seem to recall that they published the coefficients for the multiple elements. You can reconstruct the location and strength of the peaks and dips from the coefficients. Time to bust out Abramowitz and Stegun or your favorite math methods text.
2d
comment Do the laws of physics that apply to all observers also apply to a non-observer?
You seem to be trying to reason out the meaning of relativity in words without understanding the underlying math. That is a mistake. Words are blunt tool with imprecise meaning. The math matters, because that is where all the answers are. The answers to all the question you've been asking in such awkward ways are right there on the surface of the math. Insisting that you can scramble among the words and get valid answers that contradict the well tested math is only going to annoy people.
2d
revised What happened to the International Earth Rotation and Reference Systems (IERS) website?
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2d
comment What happened to the International Earth Rotation and Reference Systems (IERS) website?
The fate of some other website is not really a topic for Physics SE. If you had sufficient rep you could take this to chat---though getting an answer depends entirely on someone else being interested. I'm also going to strip the URL, because with it present this looks like a tactic that spammers would use.
Jul
18
comment Stellar remnants in a state of matter denser than neutron-degenerate
Note that we have no observation of compact, radiating object that might be neutron or quark stars that unambiguously exceed the neutron star mass limit. But then, we have so few accurate masses for such objects that this may not say anything at all. We also have a unanswered question on what the mass limit for a quark star would be.
Jul
18
comment I don't get band structure of solids
"Because in solid states, the electrons are not bound." Carefully, here. That are not bound to a particular atom, but are (weakly) bound to the solid.
Jul
18
comment Twins Paradox Paradox
The phrase "All objects travel at the speed of light in space time." need to be understood in the correct mathematical context (and with an awareness that the distribution of that motion in "time" and "space" is observer dependent), and you are trying to force and almost-but-not-quite-correct understanding onto it.
Jul
18
comment Visualizing Electromagnetic Waves in 3D Space
I've converted several link-only answers to comments.
Jul
18
revised Can you explain Fermat's Principle to me?
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Jul
18
comment What's the difference between running up a hill and running up an inclined treadmill?
Again, if this analysis held then tilting the bed of the treadmill wouldn't make it harder to run. Tilting the bed does make it harder to run.
Jul
18
revised Can you explain Fermat's Principle to me?
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Jul
18
comment Could Dark Matter particles that don't couple to quarks or leptons have been produced?
@jhobbie WIMPs are popular (at least partly) because we know how to look for them (and because they can cool; I suspect that the OP's guess won't cool right), but this is mostly a matter of "looking for our keys under the streetlight". If we don't even know how to try to detect a particular flavor of dark matter than there is little point in putting a lot of effort into it.
Jul
18
answered Can you explain Fermat's Principle to me?
Jul
17
comment Twin Paradox speed of light
Yes. Do look at the wikipedia article "The general relativity solution for a static homogeneous gravitational field and the special relativity solution for finite acceleration produce identical results." and "the issue is how long the world-lines are, not how bent".
Jul
17
comment Why the original BB84 paper “Quantum cryptography: Public key distribution and coin tossing” has 'withdrawn' status?
One of the reason's for withdrawal in press is "accidental duplicate" which may explain the date issue.