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232116
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location Greece
age 74
visits member for 3 years, 9 months
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Retired experimental particle physicist.

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


Jul
5
answered Why do quarks have a fractional charge?
Jul
5
comment Stupid yet tricky question: Why do we actually see the sun?
@baptiste The link in my comment is one specific article on how classical fields emerge from quantum theory
Jul
5
answered Do electrons have a radius when they behave like a particle?
Jul
5
comment Stupid yet tricky question: Why do we actually see the sun?
@baptiste you might be interested to read the link I provided in a comment to the question motls.blogspot.gr/2011/11/… . It shows how it aint so simple to get the classical EM wave from the photon/particle ensemble.
Jul
4
comment Stupid yet tricky question: Why do we actually see the sun?
You might be interested to read the article by @LubosMotl which discusses how classical fields emerge from a quantum theory of particles motls.blogspot.gr/2011/11/…
Jul
4
revised In which direction do gravitons travel? Do they originate from mass or are they collected by masses?
changed to fit the edits of question
Jul
4
comment In which direction do gravitons travel? Do they originate from mass or are they collected by masses?
@ChrisWhite followed your lead
Jul
4
answered Photons-Wave/particle duality
Jul
4
comment Is there an inherent difference between solids, liquids, and gases?
There is something of the oxymoron in your " much more meaningful to talk about phase transitions than the reality of states of matter in themselves." How can one have transitions from vaguely defined phases? The fact that there are similarities between some behaviors of two phases does not mean they can not be well defined, imo. They are defined by the dissimilar behaviors.
Jul
4
revised Stupid yet tricky question: Why do we actually see the sun?
added 234 characters in body
Jul
4
revised Stupid yet tricky question: Why do we actually see the sun?
added 983 characters in body
Jul
3
answered Stupid yet tricky question: Why do we actually see the sun?
Jul
3
comment Can we apply Schrodinger equation in Newton Gravitational potential and derive the deterministic Newton's gravitation as a special case of it
But a neutron is a composite object and it has spill over diagrams electromagnetic and strong which will affect how a neutron behaves at short scales.
Jul
3
revised Can we apply Schrodinger equation in Newton Gravitational potential and derive the deterministic Newton's gravitation as a special case of it
added link to relevant paper
Jul
3
comment Can we apply Schrodinger equation in Newton Gravitational potential and derive the deterministic Newton's gravitation as a special case of it
Your answer does not address the question, whether a Hydrogen atom solution of the shroedinger equation could exist. It addresses a different aspect, the effect of gravity on the solutions.
Jul
3
comment How should observers determine whether they can be described as being “defined on a Lorentzian manifold”?
@BenCrowell The fact that we are talking about Lorenzian manifolds is because experimental data made it necessary. Otherwise we are playing mathematical games detached from the physical world.
Jul
3
comment Can we apply Schrodinger equation in Newton Gravitational potential and derive the deterministic Newton's gravitation as a special case of it
But that is exactly what I am saying: if you only have gravity then you can have a potential solution similar to the hydrogen atom. But if we suppose neutral composite objects they will have other forces entering short range and the Schroedinger solutions cover from 0 to infinity. Thus one should have completely neutral to the other three interactions point particles.
Jul
3
answered Can we apply Schrodinger equation in Newton Gravitational potential and derive the deterministic Newton's gravitation as a special case of it
Jul
3
answered Is there an inherent difference between solids, liquids, and gases?
Jul
3
answered How should observers determine whether they can be described as being “defined on a Lorentzian manifold”?