I am generally interested in the role of "pings"(0a) between participants (a.k.a. "signal roundtrips"(0b), as familiar for instance from Synge's "five point curvature detector") in the determination of geometric relations;
and I am frequently missing their explicit consideration (e.g. from answers to questions such as this: "Would you notice if you fell into a black hole?" (PSE/q/187917) ). Therefore I'd like to ask a related question in which pings are plainly the main point of the setup description:
Consider, as a thought-experiment, a person who is falling(1a), while taking a sequence of selfies, operating a convenient device(0c) with a "front camera" and a "display" (or even several such devices, all separated from the face of the person under consideration). While taking these selfies the person under consideration is also directly reviewing(0d) the resulting photiographs. Can this person notice anything "peculiar, associated with a horizon(1b)" before hitting a singularity(1c)?
(0abcd: Note that there is no explicit mentioning at all of signal "pings" or "roundtrips" in the question "Would you notice if you fell into a black hole?" (PSE/q/187917) by user3137702, nor in any of the answers submitted to that question.).
(1abc: Applicable (geometric) notions such as "to fall", "horizon" and "to hit a singularity" shall be presumed as used in this answer.).
EDIT
To whom it may concern:
Recently there has been some HTML code inserted at the top of my question; anonmously, without any apparent entry in the version history of my question, and without any notification given to my "inbox" ...
For the benefit of the anonymous editor who possibly failed to appreciate as a sufficient distinction that
... let me add the tag equivalence-principle to my question, which IMHO may be considered to have some sort of relevance to my question (while it is evidently presently absent from question PSE/q/21319).
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