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Lorentz symmetry breaking as a quantum field theory regulator

Matt Visser

  • School of Mathematics, Statistics, and Operations Research, Victoria University of Wellington, Wellington 6140, New Zealand

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Phys. Rev. D 80, 025011 – Published 23 July, 2009

DOI: https://doi.org/10.1103/PhysRevD.80.025011

Abstract

Perturbative expansions of quantum field theories typically lead to ultraviolet (short-distance) divergences requiring regularization and renormalization. Many different regularization techniques have been developed over the years, but most regularizations require severe mutilation of the logical foundations of the theory. In contrast, breaking Lorentz invariance, while it is certainly a radical step, at least does not damage the logical foundations of the theory. I shall explore the features of a Lorentz symmetry breaking regulator in a simple polynomial scalar field theory and discuss its implications. In particular, I shall quantify just “how much” Lorentz symmetry breaking is required to fully regulate the quantum theory and render it finite. This scalar field theory provides a simple way of understanding many of the key features of Hořava’s recent article [Phys. Rev. D 79, 084008 (2009)] on 3+1 dimensional quantum gravity.

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References (28)

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Phys. Rev. D 80, 025011– Published 23 July, 2009
  • Received 26 April 2009

© 2009 American Physical Society

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