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237153
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location Greece
age 75
visits member for 4 years, 3 months
seen 30 mins ago

Retired experimental particle physicist.

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


Apr
23
answered Why do inverse square forces not rise asymptotically for $r\to 0$?
Apr
22
answered Questions about the strange character of antimatter
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
answered Does the second law of thermodynamics take into consideration of attractive interactions between particles?
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
22
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.
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
awarded  Nice Answer
Apr
19
comment Why do termite pellets fall in a perfect circle?
I have edited the answer
Apr
19
revised Why do termite pellets fall in a perfect circle?
correction after edit of question
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/… .
Apr
19
revised Why do termite pellets fall in a perfect circle?
deleted 108 characters in body
Apr
19
answered Why do termite pellets fall in a perfect circle?
Apr
19
comment Why do termite pellets fall in a perfect circle?
This is appropriate for an entomology site. One has to study the way the termite eats , if it is the left overs of making a hole, or it defecates, if it is that. No, it is not quantum mechanics other than everything at the bottom is quantum mechanics. ( it is not my -1 but I fear you will get more as the question is not suitable here).