Jerry Rosen

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Explicit Fermi coordinates are given for geodesic observers comoving with the Hubble flow in expanding Robertson-Walker spacetimes, along with exact expressions for the metric tensors in these coordinates. For the case of non inflationary cosmologies, we show that Fermi coordinate charts are global, and spacetime is foliated by space slices of constant(More)
INTRODUCTION Since the 11 September 2001 terrorist attacks in the United States, concerns have been raised regarding the threat of a radiological terrorist weapon. Although the probability of the employment of a nuclear device is remote, the potential of a radiological dispersal device (RDD) or "dirty bomb" is of concern. While it is unlikely that such a(More)
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