Redshift/blueshift inside the Schwarzschild black hole. (arXiv:1910.00669v1 [gr-qc])
<a href="http://arxiv.org/find/gr-qc/1/au:+Zaslavskii_O/0/1/0/all/0/1">O. B. Zaslavskii</a>
We consider an observer who moves under the horizon of the Schwarzschild
black hole and absorbs a photon. There are two qualitatively different
situations when (i) a photon comes from infinity, (ii) it is emitted by another
observer near the past (illusory) horizon. We analyze the frequency change for
absorption near the event horizon and near the singularity. In general, the
result depends strongly on the angular momenta of an observer and a photon. For
pure radial motion, radiation inside the horizon experiences ubounded redshift
in case (ii) and, moreover, near the singularity this is valid also for case
(i). For nonzero momenta, it has a finite frequency or experiences the
unbounded blueshift. There is scenario in which the ubounded redshift in the
intermediate region inside the horizon changes to the unbounded blueshift when
an observer approaches the singularity.
We consider an observer who moves under the horizon of the Schwarzschild
black hole and absorbs a photon. There are two qualitatively different
situations when (i) a photon comes from infinity, (ii) it is emitted by another
observer near the past (illusory) horizon. We analyze the frequency change for
absorption near the event horizon and near the singularity. In general, the
result depends strongly on the angular momenta of an observer and a photon. For
pure radial motion, radiation inside the horizon experiences ubounded redshift
in case (ii) and, moreover, near the singularity this is valid also for case
(i). For nonzero momenta, it has a finite frequency or experiences the
unbounded blueshift. There is scenario in which the ubounded redshift in the
intermediate region inside the horizon changes to the unbounded blueshift when
an observer approaches the singularity.
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