A Measure of Classicality. (arXiv:2104.14465v1 [gr-qc])
<a href="http://arxiv.org/find/gr-qc/1/au:+Hartle_J/0/1/0/all/0/1">James B. Hartle</a> (UCSB), <a href="http://arxiv.org/find/gr-qc/1/au:+Gell_Mann_M/0/1/0/all/0/1">Murray Gell-Mann</a> (deceased)
A striking feature of our fundamentally indeterministic quantum universe is
its quasiclassical realm — the wide range of time place and scale in which the
deterministic laws of classical physics hold. Our quasiclassical realmis an
emergent feature of the fundamental theories of our universe’s quantum state
and dynamics. There are many types of quasiclassical realms our Universe could
exhibit characterized by different variables, different levels of
coarse-graining, different locations in spacetime, different classical physics,
and different levels of classicality.We propose a measure of classicality for
quasiclassical realms, We speculate on the observable consequences of different
levels of classicality especially for information gathering and utilizing
systems (IGUSes) such ourselves as observers of the Universe.
A striking feature of our fundamentally indeterministic quantum universe is
its quasiclassical realm — the wide range of time place and scale in which the
deterministic laws of classical physics hold. Our quasiclassical realmis an
emergent feature of the fundamental theories of our universe’s quantum state
and dynamics. There are many types of quasiclassical realms our Universe could
exhibit characterized by different variables, different levels of
coarse-graining, different locations in spacetime, different classical physics,
and different levels of classicality.We propose a measure of classicality for
quasiclassical realms, We speculate on the observable consequences of different
levels of classicality especially for information gathering and utilizing
systems (IGUSes) such ourselves as observers of the Universe.
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