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SUMMARY:Great twin puzzles of physics today: Quantum measurement problems\
, and Emergence of classical mechanics from quantum mechanics
DTSTART:20221206T130000Z
DTEND:20221206T140000Z
DTSTAMP:20230929T123700Z
UID:indico-event-33293@agenda.infn.it
DESCRIPTION:Speakers: Kenichi Konishi (Univ. Pisa and INFN\, Pisa)\n\nWe d
iscuss the first steps for solving what may be called great twin puzzles i
n physics today: the so-called quantum measurement problems on the one han
d\, and the emergence of the classical mechanics in quantum mechanics\, on
the other. These two classes of problems are often mixed up in the litera
ture\, making the whole questions look more mysterious and confusing than
necessary. Actually they are - mostly - distinct and independent issue
s\, better to be considered separately. At the same time\, however\, the
re are a couple of aspects linking the two classes of the problems\, in a
precise way. \n\nFirst we discuss the solutions of the quantum measuremen
t problems from a new perspective\, based on two key ideas. The particle n
ature of the basic building blocks of our world\, and the particularly sub
tle way factorization and entanglement interplay in the physical measureme
nt processes\, are the keys for eliminating the difficulties associated wi
th Born’s rule. From our new perspective\, the quantum fluctuations desc
ribed by the wave function are real: they are there\, independently of any
experiments\, and of human presence. \n\nIn the second part of the talk\
, Newton’s law is derived from quantum mechanics\, for a macroscopic bod
y in the vacuum\, at finite temperatures. We first review three issues (He
isenberg’s uncertainty relations\, absence of the diffusion\, and decohe
rence): together\, they explain why the CM of a macroscopic body at finite
T has a well-defined classical trajectory. We then apply Ehrenfest’s th
eorem to derive Newton’s equation for it\, under the gravitational force
s\, a harmonic potential\, and a weak external electromagnetic fields. \n
\nQuestion of the boundaries between quantum and classical is briefly disc
ussed and some final reflections will conclude the talk. \n\n \n\n \
n\nhttps://agenda.infn.it/event/33293/
LOCATION:aula magna
URL:https://agenda.infn.it/event/33293/
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