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SUMMARY:Great twin puzzles of physics today: Quantum measurement problems\
, and Emergence of classical mechanics from quantum mechanics
DTSTART;VALUE=DATE-TIME:20221206T130000Z
DTEND;VALUE=DATE-TIME:20221206T140000Z
DTSTAMP;VALUE=DATE-TIME:20230204T210400Z
UID:indico-event-33293@agenda.infn.it
DESCRIPTION:Speakers: Kenichi Konishi (Univ. Pisa and INFN\, Pisa)\nWe dis
cuss the first steps for solving what may be called great twin puzzles in
physics today: the so-called quantum measurement problems on the one hand\
, and the emergence of the classical mechanics in quantum mechanics\, on t
he other. These two classes of problems are often mixed up in the literatu
re\, making the whole questions look more mysterious and confusing than ne
cessary. Actually they are - mostly - distinct and independent issues\
, better to be considered separately. At the same time\, however\, there
are a couple of aspects linking the two classes of the problems\, in a pr
ecise way. \n\nFirst we discuss the solutions of the quantum measurement
problems from a new perspective\, based on two key ideas. The particle nat
ure of the basic building blocks of our world\, and the particularly subtl
e way factorization and entanglement interplay in the physical measurement
processes\, are the keys for eliminating the difficulties associated with
Born’s rule. From our new perspective\, the quantum fluctuations descri
bed by the wave function are real: they are there\, independently of any e
xperiments\, and of human presence. \n\nIn the second part of the talk\,
Newton’s law is derived from quantum mechanics\, for a macroscopic body
in the vacuum\, at finite temperatures. We first review three issues (Heis
enberg’s uncertainty relations\, absence of the diffusion\, and decohere
nce): together\, they explain why the CM of a macroscopic body at finite T
has a well-defined classical trajectory. We then apply Ehrenfest’s theo
rem to derive Newton’s equation for it\, under the gravitational forces\
, a harmonic potential\, and a weak external electromagnetic fields. \n\n
Question of the boundaries between quantum and classical is briefly discus
sed and some final reflections will conclude the talk. \n\n \n\n \nh
ttps://agenda.infn.it/event/33293/
LOCATION:aula magna
URL:https://agenda.infn.it/event/33293/
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