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Spacetime foam, CPT anomaly, and photon propagation | | F.R. Klinkhamer
; C. Rupp
; | | Date: |
2 Dec 2003 | | Journal: | Phys.Rev. D70 (2004) 045020 | | Subject: | hep-th astro-ph gr-qc hep-ph | | Abstract: | The CPT anomaly of certain chiral gauge theories has been established previously for flat multiply connected spacetime manifolds M of the type R^3 x S^1, where the noncontractible loops have a minimal length. In this article, we show that the CPT anomaly also occurs for manifolds where the noncontractible loops can be arbitrarily small. Our basic calculation is performed for a flat noncompact manifold with a single "puncture," namely M = R^2 x (R^2 {0}). A hypothetical spacetime foam might have many such punctures (or other structures with similar effects). Assuming the multiply connected structure of the foam to be time independent, we present a simple model for photon propagation, which generalizes the single-puncture result. This model leads to a modified dispersion law of the photon. Observations of high-energy photons (gamma-rays) from explosive extragalactic events can then be used to place an upper bound on the typical length scale of these punctures. | | Source: | arXiv, hep-th/0312032 | | Services: | Forum | Review | PDF | Favorites | |
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