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X-WR-CALNAME:Philosophy, Logic and Scientific Method
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BEGIN:VEVENT
DTSTART;TZID=Europe/London:20140512T171500
DTEND;TZID=Europe/London:20140512T184500
DTSTAMP:20161127T201404
CREATED:20140922T154448
LAST-MODIFIED:20140922T154448
UID:501-1399914900-1399920300@www.lse.ac.uk
SUMMARY:J. Brian Pitts (Cambridge): Real Change Happens in Hamiltonian General Relativity
DESCRIPTION:Speaker: J. Brian Pitts (Cambridge)\n\n\nTime: 5:15pm - 6:45pm\n\n\n\nTitle: Real Change Happens in Hamiltonian General Relativity\n\n\n\nAbstract: In General Relativity in Hamiltonian form; change has seemed to be missing; because the Hamiltonian is a sum of first-class constraints and thus supposedly generates gauge transformations.  The gauge generator; a specially _tuned sum_ of first-class constraints; facilitates seeing that a solitary first-class constraint generates not a gauge transformation; but a bad physical change in electromagnetism or General Relativity; spoiling the constraints; Gauss's law or the Gauss-Codazzi relations; in terms of the physically relevant velocities.  Insistence on Hamiltonian-Lagrangian equivalence holds the key; including a reformed Bergmann-inspired notion of observables.  Taking objective change to be ineliminable time dependence; there is change in GR without matter just in case there is no time-like Killing vector. The Hamiltonian formalism agrees.\n\n
URL:http://www.lse.ac.uk/philosophy/events/j-brian-pitts-cambridge-real-change-happens-in-hamiltonian-general-relativity/
CATEGORIES:Sigma Club
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