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237153
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location Greece
age 75
visits member for 4 years, 3 months
seen 7 hours ago

Retired experimental particle physicist.

The picture is a fayum . It looks like aunts and cousins of mine :).


6h
comment Is it possible to make use of the gluon field's energy to use is applications?
Most of the mass of the proton/neutron comes from the four vectors of all the quarks and gluons in the sea, not only the valence quarks.
6h
comment Is it possible to make use of the gluon field's energy to use is applications?
The strong interaction is within the nucleon bag, because of the color quantum numbers the whole bag is color neutral. The spill over forces from the gluons come when two nucleons are in very close proximity where distortions of the nuclei allow attraction between gluons and quarks from one nucleus to gluons and quarks of another . Close proximity means values within the Heisenberg uncertainty bounds, nuclear distances in this case, order of fermi
10h
comment Second law of thermodynamics (in terms of entropy)
whence did you get the definition for closed? "A closed system in classical mechanics would be considered an isolated system in thermodynamics."en.wikipedia.org/wiki/Closed_system . I think it is unnecessarily confusing to make a distinction . For entropy second law one needs isolation (count microstates)
10h
comment Is it possible to make use of the gluon field's energy to use is applications?
No, because solar panels work with solid state energies of the order of kilo eV. Nuclear power (spill over gluon effects) is of order of Mega eV. Solid state is no go for the strong force, it melts.
20h
comment Can someone explain the quote “there would be no chemistry if electrons acted as bosons”?
I mean l=0 for symmetric, everything is symmetric after all .
20h
comment Can someone explain the quote “there would be no chemistry if electrons acted as bosons”?
@DanielLC The opposite spin gives a tiny higher order difference that would be missing without the PEP. In any case , take a simple hydrogen atom, it also makes H2. The distorted charge distributions must come from the proton, how the quarks shape up within the proton to allow spill forces that would give enough distortions to allow for molecular orbitals. without PEP there is no reason for asymmetries . lowest ground states are symmetric.
21h
comment Can someone explain the quote “there would be no chemistry if electrons acted as bosons”?
@DanielLC I think it is again due to the Pauli exclusion. The two electrons of the two atoms have to be in different molecular orbitals. With no Pauli exclusion they would both be at the lowest molecular state , then I think they would end up as a heavy deuteron with two protons and two neutrons and two electrons outside. Not a molecule.
21h
comment Can someone explain the quote “there would be no chemistry if electrons acted as bosons”?
@DanielLC It is inert chemially if the only other shapes it can find are other deuteriums. It is not the mass that makes for chemistry but the shape of charge distributions and all the shapes would be spherically neutral.
1d
comment What are some current models for neutron star core?
Just google "neutron star superfluidity" astro.ulb.ac.be/~chamel/hydro_ns.html
2d
comment How does electric energy flow in a circuit?
@garyp in my view at the level of electrons everything happens with the exchanges of photons, either virtual or real. Heat is infrared photons, light has higher frequency and comes from excited levels due to multiple infrared absorptions
2d
comment How fast would you have to go to claim you saw the red light as green due to the Doppler Effect?
@zeldredge I deleted the comment since the answer was edited
2d
comment Is This A Working Time Machine?
@Misc.nerdiness yes. the confusion is between causality and correlation. Correlation ( entanglement) is not necessay and sufficient to imply causality.
Apr
22
comment Does the second law of thermodynamics take into consideration of attractive interactions between particles?
Suppose you have two molecules in a box. They can be described by N transpositions. When they collide, they are no longer two, a photon is released by the collision and that increases the number of possible microstates factorially (whence the photon came, where were the molecules, etc). A photon is a particle, and black body radiation releases zillions of photons, and extra collisions even more.
Apr
22
comment Does the second law of thermodynamics take into consideration of attractive interactions between particles?
In the framework of statistical mechanics the second law is not a "law", it is derivative from the statistics. In the framework of thermodynamics it is a law. Each framework has its elegant mathematical formulation around the postulates . In thermodynamics it is a law, similar to calling axioms axioms in mathematics: necessary for the developement of the theory. It is a bonus that we discovered that thermodynamics is emergent from statistical mechanics, and can explore why at the gross thermodynamic frame we call it a law : because of the tiny probabilities involved in destroying it.
Apr
22
comment How does matter get the energy to repel the gravitational effects of itself to to other matter
Think of an inanimate object, a flower pot, a chair. It would sit there forever, no energy is exchanged or is necessary to sit there forever.
Apr
21
comment Antineutron repelled by gravity?
The neutrons and antineutrons will decay pretty soon after production, so experiments with antineutrons for something that can be studied with antiprotons are out of the picture anyway, even forgetting the difficulties of neutrality of charge.
Apr
20
comment When we are inside a plane and look outside the window why does everything (outside) appear to be at rest?
hi Sagnic. When you are in a train and you look at a distant mountain, does it move? It is a matter of distance and relative velocity
Apr
20
comment Are there any good books about Grand Unified Theories?
Usually the CERN schools do a good job of introduction to subjects. I have not read it, but here cds.cern.ch/record/169005/files/CERN-86-03-V-2.pdf is a lecture on GUTs that might help. You might find the yellow report in a library
Apr
19
comment Why do termite pellets fall in a perfect circle?
I have edited the answer
Apr
19
comment Understanding the behavior of light/photons inside a Laser
Also there exist wavefunctions for the photon. see motls.blogspot.com/2011/11/… .