Thursday, May 3, 2012

negative redshifts

would negative cosmological redshifts (aka blueshifts  ;) ) be useful to describe events in the future evolution of the Universe? if yes, what'd be the largest (most negative) redshift which can be defined in a sensible way?

1 comment:

  1. Yes, you can use negative redshifts to represent the future - see:

    http://xxx.lanl.gov/pdf/astro-ph/0510791v1.pdf

    as an example. For a universe where the scale factor diverges to infinity, the most negative redshift is -1.

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