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230107
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location Greece
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Retired experimental particle physicist.

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


May
31
comment List of the basic quantum mechanical variables
yes , color is the three colors of QCD, it is a quantum number (badly named ). I think also , for Lorenz invariance (p_x,p_y,p_z,E) are independent variables. from these two sets of variables various other useful ones can be defined.
May
31
comment List of the basic quantum mechanical variables
the quantum numbers listed in the table of the link are like axioms, attributes describing the particles. These are mass, charge, spin, plus color, lepton number , baryon number. These are quantum numbers extracted from experimental data, i.e. that is the way nature is.
May
31
comment List of the basic quantum mechanical variables
The attributes of elementary particles are described in the standard model article, en.wikipedia.org/wiki/Standard_Model. These particles can be characterized by spacetime variables (x,y,z,t) momentum and energy variables (p_x,p_y,p_z,E) plus variables that are derived from these.
May
31
revised How is it possible the speed of light is not constant?
added link given by Ben
May
31
comment How is it possible the speed of light is not constant?
@RodyOldenhuis if you look at the link Ben Crowell gives in a comment you will see that they are talking of very small numbers. The analogy with a transparent medium cannot be taken too far because the calculations are not the same, the initial and boundary conditions are different. for exaple in a crystal the positive and negative charges are localized in different space regions whereas virtual particles come in pairs of charge.
May
31
answered How is it possible the speed of light is not constant?
May
30
answered What happens when a photon hits a beamsplitter?
May
30
revised Street Light Interference Phenomenon
spelling
May
30
comment Street Light Interference Phenomenon
I am skeptical of such claims until I see a documented experiment. It sounds like metaphysics, not physics. This said, in my first experimental setup, that of a spark gap that would control the charging of a spark chamber, we had to keep the boss away from the setup: when he came nearer than a meter to the spark gap it sparked continuously . Our hypothesis was that for some reason he had an anomalous static field none of the rest of us had.
May
30
comment What is the Earth truly rotating about/revolving around?
You will not be able to disentangle them with this one measurement, even if you do wait long enough.You can only solve for one unknown if you have one measurement.
May
30
comment How can particles travel in a straight line?
HUP is a fundamental postulate of QM. The mathematical formalism of QM includes it in the value of the commutators en.wikipedia.org/wiki/Uncertainty_principle there is no conflict. Uncertainty always exists in our measurements, called measurement error. A straight line drawn within two points is straight within errors and the track considered a line within errors. QM tells us that as we go to smaller and smaller scales there is an inherent "error" when trying to measure simultaneously position and momentum that cannot be clarified further by better measurements.
May
30
comment Can open, unsafe nuclear fusion reaction burn the atmosphere?
ears for black holes in the LHC experiments are resonances of this apocalyptic fears. It seems that homo sapiens expects an apocalypse whenever a frontier is crossed.
May
29
comment Non-isolated universe and arrow of space
No, it means that the concept of energy and matter are ill defined when one is workingin a general relativity framework. In local frameworks lorenz invariance hold and E^2-p^2=m^2 is the tie of matter and energy. But these variables need a space time to be defined, and if the rug is being pulled out from under them, i.e. no longer Lorenz invariant but GR rules, the concept of energy is not well defined. All the rest is confusing, though masses are defined by spacetime distortions in the GR framework.
May
29
comment Will the increasing rate of expansion of the universe eventually result in Hawking Radiation suddenly occurring everywhere?
A third villager who had listened to both expositions exploded: "But Hodja, however can they both be right on the same controversy?" Hodja thought a bit and replied : "you also my friend are in the right".
May
29
comment Will the increasing rate of expansion of the universe eventually result in Hawking Radiation suddenly occurring everywhere?
I guess we are both right :). It reminds me of a Hodja tale: Hodja, a fool or judge or both in Anatolian legends lives and arbitrates in a small village. One day a villager comes and describes his complaints against another villager . Hodja listens carefully, shakes his head and says : "my friend, you are in the right".The villager who was complained against starts his defense and also convinces Hodja to say :"my friend you are in the right".
May
29
comment Will the increasing rate of expansion of the universe eventually result in Hawking Radiation suddenly occurring everywhere?
@BenCrowell the Big Rip is an interesting scenario, but it also rips the standard model and yes, lorenz invariance locally , I guess. Not that it would not be possible when one reaches such unexplored phase spaces.
May
29
revised Will the increasing rate of expansion of the universe eventually result in Hawking Radiation suddenly occurring everywhere?
added 815 characters in body
May
29
comment Will the increasing rate of expansion of the universe eventually result in Hawking Radiation suddenly occurring everywhere?
In my opinion no, at such a hypotheis , if nuclei are ripped appart, there will not longer be bound states and no virtual particles and pair creation . The whole Standard Model will be non existent ( quarks cannot be free), virtual particles and all.
May
29
answered Will the increasing rate of expansion of the universe eventually result in Hawking Radiation suddenly occurring everywhere?
May
28
comment Is this hypo-theoretical model of future prediction feasible?
Actually part of this fantasy exists in metaphysical systems, it is called the akashic record en.wikipedia.org/wiki/Akashic_records . As in some metaphysics time is just another coordinate the future could be explored . If you add the many worlds interpretation to the soup you could calculate the probabilities of outcomes . en.wikipedia.org/wiki/Many-worlds_interpretation it is science fiction though.