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243165
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location Greece
age 75
visits member for 4 years, 5 months
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Retired experimental particle physicist.

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


Jun
17
comment Particle beam in infinite magnetic field
@EmilioPisanty For the beam it is small but the B is posited as infinite in extent ( I assume since it is given a value) after the beam enters it, so at large distances compatible with the radius of the equation I gave due to the masses the beams will separate.
Jun
17
answered Particle beam in infinite magnetic field
Jun
17
comment How to stop particles from clustering on a water surface
I have found that silicon paste used for filling up holes is hydrophobic ( have used it so that the water does not drip down the side when pouring from the water heating pot)
Jun
17
comment Heisenberg uncertainty principle applied to large bodies?
Yes, except the uncertainty is so tiny that it has no meaning in the everyday and down to microns context.
Jun
16
answered Heisenberg uncertainty principle applied to large bodies?
Jun
16
comment How is the Full Standard Model group representation displayed?
@innisfree Yes , it is wrong. Gauge bosons could exist in other groups, SU(5) or what not. The reason the specific groups were chosen was because of the measured / observed data that could be most economically ( and not with a plethora of not seen resonances and particles )slotted into SU(3*SU(2)xU(1) representations
Jun
16
comment How is the Full Standard Model group representation displayed?
@innisfree I do not disagree with your last. Gauge bosons are not enough, you have to put the quarks and leptons in en.wikipedia.org/wiki/… . The groups are the symmetry of the Lagrangian, and characterize it as a short hand.
Jun
16
comment How is the Full Standard Model group representation displayed?
@innisfree The standard model is the standard model because it has not only the gauge bosons but also the triplets, octuplets and decuplets etc in which all the plethora of particles and resonances are slotted. You did not look at the link in the answer, by which the feynman diagrams are drawn for the interactions describing crossections see also this physics.lbl.gov/shapiro/Physics226/lecture7.pdf .
Jun
16
comment Feathers and Human Flight
look at this almost flight telegraph.co.uk/news/newsvideo/weirdnewsvideo/9157973/…
Jun
16
comment Weight of magnetic objects and polarization
This site is not a site for publishing or discussing new theories. It is a site for standard physics questions and answers within it
Jun
16
revised Lifetimes of stable particles
added link
Jun
16
comment Lifetimes of stable particles
@robermann have a look here hyperphysics.phy-astr.gsu.edu/hbase/particles/qrkdec.html
Jun
16
comment Lifetimes of stable particles
@robermann the particle data group has all the numbers from particle physics pdg.lbl.gov/2014/tables/contents_tables.html
Jun
16
answered The speed of light/EM waves in vacuum; as if there was another one in non-vacuum?
Jun
16
comment Is there a theoretic temperature where single quarks might become individually stable?
@Omry Note the quotation marks, they are "one" as they have zero mass but the quantum numbers that represent them are there in the appropriate group representation (strangeness, beauty ,...) .
Jun
16
answered How is the Full Standard Model group representation displayed?
Jun
16
answered Is there a theoretic temperature where single quarks might become individually stable?
Jun
15
comment What are the effects of cosmic rays on consumer electronics?
Are you sure what you are quoting is not sheltered from cosmic rays by a lot of cement? particularly muons that arrive 1 per minute per centimeter square, I think
Jun
15
comment How does a photon mediate both electric attraction and repulsion?
@innisfree I offered it as an analogue of how, when common sense would tell you that throwing something from a boat will repulse the other boat, there is a consistent way of attracting the other boat.
Jun
15
comment How does a photon mediate both electric attraction and repulsion?
@innisfree Feynman diagrams are the calculational part of QFT itp3.uni-stuttgart.de/lehre/Archiv/ss13/quantenfeldtheorie/… . It is what the creation and annihilation operators of QED end up in .