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Article #1337Re: Quantum Cosmological Boundaries and Determinisim?
From: John C. Baez
Date: Wed, 22 Jul 1992 15:31
Date: Wed, 22 Jul 1992 15:31
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In article <braham.711770201@physics.ubc.ca> braham@physics.ubc.ca (Stephen Braham) writes: >My first remark would be that modern quantum cosmology doesn't use >a wavefunction, or even a density matrix. The alternative decohered >histories approach does not have an intermediate state in general (at >best a density matrix, which has many superselection sectors, and >thus describes, roughly, an ensemble of states). What do you mean by an "intermediate state"? By the way, lots of mathematicians use "state" to refer both to pure states (typically represented by unit vectors in Hilbert space) and mixed states (aka density matrices). What is the most lucid and interesting single reference on the alternative decohered histories approach? I've read a bit about it but could stand some more.
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Newsgroups: sci.physics Path: arc1-ca.pugleaf.net!sparky!uunet!elroy.jpl.nasa.gov!usc!snorkelwacker.mit.edu!galois!riesz!jbaez From: jbaez@riesz.mit.edu (John C. Baez) Subject: Re: Quantum Cosmological Boundaries and Determinisim? Message-ID: <1992Jul22.153115.25069@galois.mit.edu> Keywords: Quantum cosmology Sender: news@galois.mit.edu Nntp-Posting-Host: riesz Organization: MIT Department of Mathematics, Cambridge, MA References: <jtwamley.711766649@adelphi> <braham.711770201@physics.ubc.ca> Date: Wed, 22 Jul 92 15:31:15 GMT Lines: 17