On 28-08-2019 08:40, Philip Thrift wrote:
On Wednesday, August 28, 2019 at 12:49:06 AM UTC-5, Brent wrote:
On 8/27/2019 10:43 PM, Philip Thrift wrote:
"It's an experimentally well-confirmed fact that virtual particles
exist."
-
http://backreaction.blogspot.com/2019/08/how-do-black-holes-destroy-information.html?showComment=1566705434388#c7842618397891133114
[1]
"Explanations in terms of virtual particles don't really work
because virtual particles do not exert any force on anything --
because they are not real!!!!"
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https://groups.google.com/d/msg/everything-list/ixyC1nvZ3i8/NsBRnAvdBAAJ
[2]
Now it seems to me that these are contradictory.
They seem so, but they are referring to different contexts.
Brent
What are the two contexts?
I guess _X is real or exists_ in one context, but _X is not real or
does not exist_ in another context needs to be defined.
What exists are the fields associated with particles. Particles can be
interpreted as existed states of fields. If we ignore interactions and
then introduce them in perturbation theory, then particles states in the
non-interacting theory can appear in computations when these particles
are never produced in the process that one is considering.
There are also processes where the particles can be produced out of the
vacuum due to exiting the quantum field. E.g. Schwinger pair creation in
a strong electric field, the dynamical Casimir effect where an
accelerating mirror will cause the creation of photons out of the
vacuum. Another example is that of a reflecting rotating sphere in
vacuum what will slow down due to the emission of photons, as pointed
out here:
http://www.jetpletters.ac.ru/ps/1604/article_24607.pdf
Saibal
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