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234123
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age 74
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Retired experimental particle physicist.

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


Nov
19
comment Moving frames - a blow on “virtual particles”?
yes, virtual photons, i.e. they have the quantum numbers of the photon except they are off mass shell. At the limit of static fields their wavelength goes to infinity and their enegy to zero, except that absolute stasis conflicts with the HUP
Nov
19
answered What is the Poynting vector of an electron?
Nov
19
answered Quantum theory of light
Nov
19
comment How do we know if distant stars we see by their light are real objects?
is the sun real? it is distant enough. we see the spectral lines from known atoms and their motions agree with Newton's laws to first order. If it walks like a duck and it quacks like a duck it is a duck.
Nov
19
reviewed Approve suggested edit on What do physicists mean by “information”?
Nov
18
comment Why does a photon take less than a week to come out of the convection zone of the sun?
You should add that the density of the plasma in the radiative zone is very high, so that convection cannot take place that is why it takes years for photons to come out . The convection zone is less dense. en.wikipedia.org/wiki/Sun#Characteristics
Nov
18
revised A misunderstanding regarding infinite square well
added 68 characters in body
Nov
18
answered A misunderstanding regarding infinite square well
Nov
18
answered Detecting radioactive material at a distance
Nov
18
comment Is it possible to create a parachute large enough to stop all velocity?
@Ruslan that is why I defined Parachute, it is a method to preserve the life of the ejected pilots/passangers. It is not suppose to stay in the air , but help in the safety, which is why parachutes were invented. An aerostat serves a differnt function.
Nov
18
revised Is it possible to create a parachute large enough to stop all velocity?
added 127 characters in body
Nov
18
answered Is it possible to create a parachute large enough to stop all velocity?
Nov
17
awarded  Good Answer
Nov
17
answered What is many-body bound state?
Nov
17
comment The virtual particles are only a fictive tool in equations? DO they exist or DON'T? And if they exist, why do we call them VIRTUAL?
The word "virtual" is used in a similar physics sense as the "virtual" image in optics. One cannot take a photograph of a virtual image and one cannot measure properties of virtual particles other than infer their quantum numbers by conservations laws for a specific Feynman diagram.
Nov
17
comment How do we know that subatomic particles, Quarks, Neutrinos, and even Gluons, are not operating in multiple dimensions?
Are you aware of string theories? en.wikipedia.org/wiki/String_theory . In these there are many dimensions and all elementary particles are excitations on strings. They are being developed with strict mathematics , which is necessary for hand waving to become a theory.
Nov
17
comment Bound electrons don't move, right?
I think you have to give a link or copy the paragraph that bothers you.
Nov
16
comment Do virtual photons have a frequency?
@brightmagus as a mathematical tool,yes
Nov
16
revised What happens to the energy when waves perfectly cancel each other?
clarification and addition from the deleted answer
Nov
16
comment What happens to the energy when waves perfectly cancel each other?
this video from MIT youtube.com/watch?v=RRi4dv9KgCg shows very clearly what happens to the energy when there exists destructive interference in electromagnetic waves.