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PRODID:-//Philosophy, Logic and Scientific Method - ECPv4.2.1.1//NONSGML v1.0//EN
CALSCALE:GREGORIAN
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X-WR-CALNAME:Philosophy, Logic and Scientific Method
X-ORIGINAL-URL:http://www.lse.ac.uk/philosophy
X-WR-CALDESC:Events for Philosophy, Logic and Scientific Method
BEGIN:VEVENT
DTSTART;TZID=Europe/London:20151005T171500
DTEND;TZID=Europe/London:20151005T184500
DTSTAMP:20161128T161726
CREATED:20150916T092914
LAST-MODIFIED:20150923T160203
UID:4365-1444065300-1444070700@www.lse.ac.uk
SUMMARY:Roman Frigg (LSE): "Rethinking Equilibrium"
DESCRIPTION:Abstract: In Boltzmannian statistical mechanics macro-states supervene on micro-states. This leads to a partitioning of the state space of a system into regions of macroscopically indistinguishable micro-states. The largest of these regions is singled out as the equilibrium region of the system. What justifies this association? We review currently available answers to this question and find them wanting both for conceptual and for technical reasons. We propose a new conception of equilibrium and prove a mathematical theorem which establishes in full generality -- i.e. without making any assumptions about the system's dynamics or the nature of the interactions between its components -- that the equilibrium macro-region is the largest macro-region. We then turn to the question of the approach to equilibrium\, of which there exists no satisfactory general answer so far. In our account\, this question is replaced by the question when an equilibrium state exists. We prove another -- again fully general -- theorem providing necessary and sufficient conditions for the existence of an equilibrium state. This theorem changes the way in which the question of the approach to equilibrium should be discussed: rather than launching a search for a crucial factor (such as ergodicity or typicality)\, the focus should be on finding triplets of macro-variables\, dynamical conditions\, and effective state spaces that satisfy the conditions of the theorem.\n\nRoman Frigg is Professor of Philosophy at LSE and Director of the Centre for the Philosophy of Natural and Social Sciences (CPNSS).
URL:http://www.lse.ac.uk/philosophy/events/roman-frigg-lse-rethinking-equilibrium/
LOCATION:Lakatos Building\, London\, WC2A 2AE\, United Kingdom
CATEGORIES:Sigma Club
ORGANIZER;CN="Bryan%20W.%20Roberts":MAILTO:b.w.roberts@lse.ac.uk
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