Abstract: I discuss some simple aspects of the low-energy physics of a nontrivial scale
invariant sector of an effective field theory -- physics that cannot be
Abstract: We review the current status of dimensions, as the result of a long and
controversial history that includes input from philosophy and physics. Our
conclusion is that they are subjective but essential concepts which provide a
kind of book-keeping device, their number increasing as required by advances in
Abstract: Model selection aims to determine which theoretical models are most plausible
A New Estimate of the Hubble Time with Improved Modeling of Gravitational Lenses
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