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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 :).


15h
comment What are some current models for neutron star core?
Just google "neutron star superfluidity" astro.ulb.ac.be/~chamel/hydro_ns.html
21h
answered Could the missing antimatter lie outside the observable universe?
22h
answered Is the Physics for extremely large and extremely small particles similar in any aspect?
1d
answered cosmological red shift significance in terms of success of gr
1d
answered How do megaphones work?
1d
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
1d
answered How does electric energy flow in a circuit?
1d
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
1d
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.
1d
answered Why do inverse square forces not rise asymptotically for $r\to 0$?
2d
answered Questions about the strange character of antimatter
2d
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.
2d
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.
2d
answered Does the second law of thermodynamics take into consideration of attractive interactions between particles?
2d
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.
2d
answered Does our universe have an even distribution of matter in every direction
Apr
21
awarded  Nice Answer
Apr
21
answered Motivation for isospin
Apr
21
answered Why aren't we affected by radium?
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.