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7/29/2019 On the Reality of Time and the Evolution of Laws
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Title: On the reality of time and the evolution of laws
Date: 2008-10-02 11:45:00
Abstract: There are a number of arguments in the philosophical, physical and
cosmological literatures for the thesis that time is not fundamental to the
description of nature. According to this view, time should be only an
approximate notion which emerges from a more fundamental, timeless
description only in certain limiting approximations. My first task is toreview these arguments and explain why they fail. I will then examine the
opposite view, which is that time and change are fundamental and, indeed,
are perhaps the only aspects of reality that are not emergent from a more
fundamental, microscopic description. The argument involves several aspects
of contemporary physics and cosmology including 1) the problem of the
landscape of string theory, 2) cosmological inflation and the problem of
initial conditions, 3) the interpretation of the wavefunction of the
universe, and the problem of what is an observable in classical and
quantum general relativity. It also involves issues in the foundations of
mathematics and the issue of the proper understanding of the role of
mathematics in physics. The view that time is real and not emergent is, I
will argue, supported by considerations arising from all these issues It
leads finally to a need for a notion of law in cosmology which replaces the
freedom to choose initial conditions with a notion of laws evolving in
time. The arguments presented here have been developed in collaboration
with Roberto Mangabeira Unger .
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