Recent content by dpyikes

Thanks Hi, I just wanted to thank MeJennifer, Pervect and Chris Hillman for their responses and patience. It is indeed the case that "dpyikes intuition has come to the wrong conclusion because he has been ignoring the doppler shift - and the doppler shift is not ignorable" I have...

Pervect – I think I have no problem with what you are saying about #1 – I was imagining A and B sending signals to each other rather than receiving signals from a third source. In your scenario, a source external to our two observers is sending light signals that are received once a second as...

Pervect -- I think I liked it better when you were answering the questions. ”1) If you are standing still, and your friend is passing you by at a significant percent of light speed, do you both agree on the frequency of a light beam, or is there some relative red/blue shift due to the...

Yes, MeJennifer -- It seems to me that the proper time between signals received ought to approach zero, unless there is something about time and space switching roles inside the event horizon that prevents this.

MeJennifer – You write: “the absorbing atom observes gravitational redshift if emitting atom was "redder" and gravitational blueshift if the emitting atom was "bluer".” In the relevant case, the absorbing atom is on the surface of the collapsing star, the emitting atom is at some point...

I’m afraid I continue to be perplexed about the way time dilation works inside the event horizon, particularly for the case of a collapsing star. What I am interested in is a sequence of light rays which had originated from flat space, and are striking the surface of the star. Pervect, you...

Suppose signals are being sent from flat space at one a second to an object that is just about to collapse into a singularity, and the first signal has just arrived at the surface of the the object. Give the object some appropriate mass. Is there a calculation somewhere for how many signals will...

Pervect -- Thanks for the response and the link to the diagrams. I am still not seeing how it can be the case that the white line ever turns Cyan if those yellow lines are drawn as shown -- i.e., if you've got density that is approaching infinity, then the gravitational potential will approach...

Even if there is no absolute time in GR, it seems to make sense to say that since any signal sent from flat space time into any black hole will (and always will) strike a collapsing, but not collapsed object, we can say that the universe contains no singularities. By the proper time of the...

Doesn't time dilation keep singularities from ever forming? I hope this question belongs in this thread. If someone on the surface of a star which just started collapsing into a black hole is receiving signals sent every second from an external point in "flat space", then the signals the...