4 ms·
I think the point was that time in the center of the star is more affected by gravity than at the surface. Whereas someone on the surface (if that were possible
by machrider 13y ago
I think the point was that time in the center of the star is more affected by gravity than at the surface. Whereas someone on the surface (if that were possible) would experience greater time dilation relative to the center due to his high relative velocity. So for those two points (surface vs center), the two time dilation effects are working opposite each other.
Edit: I may have been reading too much into it. The effects you see will depend on which positions you're comparing, and people in this thread haven't really specified.
- deletes 13y agoI think you mixed up some things. There is no gravity or time dilation in the center of a massive spherical object.
- nealabq 13y agoIf you're in a small empty room in the middle of a neutron star, you will be floating weightless, but you're still at the bottom of a gravity well. Since it's the well, not the acceleration that affects time, time will tick slower for you. (Don't try this at home.) (And if you do, don't touch the walls.)
- deletes 13y agoSpacetime in the center of a perfect spherical object is the same as a point in empty space, you can't tell them apart. Of course that only counts for the exact point in the center. So the time will not tick slower there as to someone far from any objects.
- ubercow13 13y agoWhat? The lowest potential in a uniform sphere is at the centre not the surface (http://en.wikipedia.org/wiki/File:GravityPotential.jpg http://en.wikipedia.org/wiki/File:GravityPotential.jpg). Also graviational time dilation depends on the potential not the force (curvature) so it is irrelevant if the point at the centre is shifted in spacetime
- deleted 13y ago[deleted]
- deleted 13y ago[deleted]
- ubercow13 13y agoTime will still tick slower though regardless of the first part of what you say being right
- deleted 13y ago[deleted]
- ubercow13 13y agoYour link doesn't even relate to time dilation and is also about a hollow sphere, not a uniformly dense solid sphere. Moreover in a hollow sphere, time dilation still occurs because it depends on the absolute (or rather, relative to an outside distant observer) potential, not the gravitational field (which is the only thing that is necessarily zero as a result of the flat spacetime in the sphere). See for example this http://physics.stackexchange.com/questions/69821/a-hollow-black-hole http://physics.stackexchange.com/questions/69821/a-hollow-bl... It's like you didn't read your link
- PeterisP 13y agoBeing unable to tell is not an argument for time not ticking slower; the whole point of time ticking slower is that everything is consistent for your point of reference and you can't tell, but your point of reference has different time than other points. Just as if you were inertially moving at 0.9c relative to me, the time frame would be different despite both me and you being 'the same as a point in empty space'.
- deletes 13y agoMy two comments above are wrong. Very counterintuitive. How can you have a difference with two points stationary relative to each other.