My text says that the signals emitted at a physical size of horizon $l_{H}(t)$ come to an observer at time $t$ with an infinite redshift. How do I show this mathematically? My approach is as follows:


Now I have no idea how to conclude this. Can anyone please help me?

  • 1
    $\begingroup$ Typically you integrate the coordinate time from/to the horizon and show the result is infinite $\endgroup$ Commented Jun 20, 2014 at 6:46


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