60,309 reputation
236148
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location Greece
age 74
visits member for 4 years, 2 months
seen 5 hours ago

Retired experimental particle physicist.

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


10h
comment Does big bang have really any justification while we are living within a huge chaos?
@owari It is similar to asking "since thermodynamics describes chaotic systems" there is no predictability in thermodynamics, or extrapolation backwards in time. There are situations, with turbulence, where it is very hard to model with thermodynamics viz the weather predictions. In the BB model this stage happens in the very beginning where it is acknowledged that theory is shaky and other hypothesis compatible or to explaing the data are put forth, like inflatio theory
18h
comment Can the Unruh effect be confirmed by the LHC?
I did think of it, except the interaction crossection calculations already must have this effect in since they use quantum field theory and I believe the vacuum is taken into account. You did give me an idea though. Maybe it is the explanation for the experimental observation of excess soft photons sciencedirect.com/science/article/pii/S0370269302028368 and references therein. A friend of mine has benn working on this for decades in various experiments.
21h
awarded  string-theory
1d
comment Why does this resource say that the Schrodinger Equation can be derived?
one needs the definition of "derive" . The paper assumes quantization and imposes it so that the hbar enters the system. It is not a pure mathematical derivation, but a heuristic derivation, using physics input. In any case it was never published in a peer reviewed journal.
1d
comment Do photons lose energy due to gravitational redshift? If so, where does the lost energy go?
On the link in your edit, I think that the second way is the simplest way in any case, since in the limit, as the gravitational field decreases, the newtonian expectation should arise, with no clocks . No physic, al clock could be following a photon out of the well anyway except another photon, and of course they see each other unchanged.
2d
revised What does the “T” stand for in T-duality?
added 206 characters in body
2d
answered What does the “T” stand for in T-duality?
2d
revised Does radiating heat to outer space through the atmospheric transparency window have any impact on heat loss?
correction, "down to cooling"
2d
comment Can the Unruh effect be confirmed by the LHC?
I do not think they average out, as that they do not have enough energy to change from virtual to real, i.e. be seen on mass shell. crudely the crests and troughs are flat, imo.
2d
answered Can the Unruh effect be confirmed by the LHC?
2d
comment Is dark matter moving faster than light?
please read upe on what is dark matter en.wikipedia.org/wiki/Dark_matter and also contrast it with dark energy: en.wikipedia.org/wiki/Dark_energy
2d
comment Do photons lose energy due to gravitational redshift? If so, where does the lost energy go?
@innisfree you can do the same mathematically in some subsystems of General relativity and this gravitational redshift is one of them. potential energy is a mathematical construct that incorporated into theories gives predictivity, true classically and can be extended to special frames for GR
2d
answered Does radiating heat to outer space through the atmospheric transparency window have any impact on heat loss?
2d
comment How can 99% empty matter have solidity?
The microcosm is not following classical physics extrapolations to atomic level that was discovered experimentally. In Quantum mechanics and special relativity the concept of matter and energy are radically redifined as well as what solid means at that level .
2d
comment Discovery of spin-3 particle at LHCb
It was not the first time. It is the first time in B resonances. please see my answer for the link
2d
comment Do photons lose energy due to gravitational redshift? If so, where does the lost energy go?
@innisfree But this last has nothing to do with general relativity. You are refuting the whole construct of classical mechanics etc too, models that have been extremely successful in predicting new data, not only modeling old.
2d
comment Do photons lose energy due to gravitational redshift? If so, where does the lost energy go?
@innisfree your feeling is going against the feeling of this mathematical exploration. In any case the question is in the limited special case, which after all is similar to where we are living.
2d
comment If the LHC-calculated mass of the Higgs is wrong, how long will it take to determine this with confidence?
Accumulating data are not the wrong rabbit hole. If people had not been experimenting we would still at best be in the sixteenth century of technology. BTW, LHC is reproducing a great number of measurements from LEP and the Tevatron, using them as a gauge for exploring further.
Mar
28
comment Do photons lose energy due to gravitational redshift? If so, where does the lost energy go?
@innisfree the question is not about energy conservation in general relativity but about gravitational red shift, where it is OK
Mar
28
revised Do photons lose energy due to gravitational redshift? If so, where does the lost energy go?
clarification on energy conservation