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232116
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location Greece
age 74
visits member for 3 years, 9 months
seen 17 mins ago

Retired experimental particle physicist.

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


59m
answered Is there some special case where a fermion can mediate a force?
11h
comment Gravity - Force or Result?
@CuriousOne except the mathematical beauty of a consistent mathematical frame for all observations, which was the aim that was followed and so physics has progressed the last centuries.
12h
comment Gravity - Force or Result?
@CuriousOne "Force" is a statement of physics semantics. It works at our everyday level and the mathematical models are rigorous within the accuracies of measurement. Take the word "particle" also a classical word and we have not abandoned it at the quantum mechanical level, ( even though it generates great confusion) because it works classically and at the limit where quantum becomes classical it has a definition. The concept of classical force is really abandoned with Feynman diagrams, it is just the continuity that generates the identity.
20h
revised Gravity - Force or Result?
added link
21h
answered Gravity - Force or Result?
21h
answered Surviving collapsing buildings: Which floor maximizes your chances of survival?
1d
comment Dalitz plot for $ \pi \to \gamma (1) + e^+ (2) + e^- (3) $
You are missing a 0 after the pi .AFAIK a Dalitz plot is used to plot data. www2.warwick.ac.uk/fac/sci/physics/staff/academic/gershon/talks/… If you have the decay matrix element you could put it in a monte carlo generator to give points in the dalitz plot.
1d
comment Quantum decoherence and Schrodinger's equation
@CountIblis in my books, a measurement has a probability of having a given value to a variable or a set of variables at time t. This measurement will be one point in accumulating the probability distribution (multidimensional if there are many measured variables) which is the square of the wave function. The probability will come from the correct amplitude.
1d
comment Quantum decoherence and Schrodinger's equation
One cannot measure a unique wave function with one measurement. One can measure the square of the wave function, i.e. the probability distribution, with many measurements accumulated .
1d
comment Is the particle reaction $π^- + p \to K^- + Σ^+$ possible?
wrong signs ? pi+p can go to K+ sigma+ :inspirehep.net/record/6000
2d
comment About the Large Hadron Collider
This is part of the ongoing analysis of LHC data on ATLAS and CMS. example arxiv.org/pdf/1307.2518.pdf
2d
comment Producing photons with same frequency, different amplitude wave
@BenCrowell I am responding to the question, where amplitude is connected with energy , that is why I put the quotation marks. I give the link where a quantum mechanical amplitude is of course defined, in case the questioner is more sophisticatedin physics than the question.
Oct
19
revised How is antimatter made?
had forgotten twice
Oct
19
revised How is antimatter made?
changed links
Oct
19
answered How is antimatter made?
Oct
19
revised If protons and electrons had similar masses
added content from comment
Oct
19
comment If protons and electrons had similar masses
@CuriousOne good point, I will add it.
Oct
19
answered If protons and electrons had similar masses
Oct
19
answered Dexcitation/Excitation of $e^-$ in Bohr Model
Oct
18
answered Why does the moon stay with the Earth?