Recent content by Jim Graham

This may help you - it's a translation of Heim's own introduction to the theory for laymen.http://home.comcast.net/~djimgraham/INDEX.HTML"

Chris Hillman: Thanks, that was helpful. The kicker for me was the Geroch book, which arrived this weekend. It helped me a lot. I can now understand that an external observer is not completely disconnected from the space-time inside the horizon of a black hole – he can cross the horizon...

By the way – I did think about the round-trip travel distance for the guy with the pedometer, and convinced myself that he would see a different round-trip distance than the stationary observer using the LTT method. The symmetry of the intermediate measurements of the three observers lead me to...

I was thinking that h was defined as the distance between r1 and r2, as observed at r1. I guess that does not make sense, since you’ve calculated this distance as the Light Travel Time (LTT) distance as seen from r1. So who observes the distance h? Not even the traveler with the pedometer in...

Yes, that is what I am thinking about "speed". Is that not true in GTR? I got tired of slogging through MTW from the beginning, so I skipped ahead, looking at the pictures as you suggested. I think I did find something relevant to my question in Firgure 25.5, page 667 of my copy. It shows a...

Hi Chris Hillman. This is an interesting concept, but I am concerned about how “Pedometer” distance is expressed here. The value of “h” is defined only at one end point. Shouldn’t you use an expression defined at each point on the line? If you did, would you get the same results as the Light...

Thanks for the recommendation, Chris Hillman. I’ve ordered the Geroch book. I just bought “Gravitation” by Misner, Thorne and Wheeler, but it looks like it will take me a long time to get to the answers there. I understand and believe that a black hole has an interior, from the perspective...

This is a quote from that Baez article: If the black hole is eternal, events happening to me (by my watch) closer and closer to the time I fall through happen divergingly later according to you (supposing that your vision is somehow not limited by the discreteness of photons, or the redshift)...

I've been reading about relativity for several years, but I'm no physicist or mathematician. This question has been bothering me lately, and I'm hoping someone out there can help me understand. I don't have the math to express this briefly, so here it is in words... When a particle of matter...