Recent content by Yuripe

How would you determine the value of your own speed in expanding spacetime where everything else in it generally moves away from each other? In this example I think speed of sound isn't frame invariant because you observe it with the speed of light. If you would reduce the speed of light so it...

If you look at universe as 3+1 dimensional space, all you can see are stationary objects (particles, matter) distributed along space and time. To each object in this spacetime you can assign a vector V which describes its dynamics. This dynamics is to be understood as rate of transition from...

Time would be then one dimension of spacetime, where theoretically you can "move" forward of backward by dt as a vector. Direction of this vector distinguishes if it's forward or backward and it's length describes the rate of this "movement". This is as viewed from a perspective of the...

We are describing time as the one dimension of spacetime but you can see that it's a little different from the other dimensions. We're not free to stop in time or change direction of our movement in it as we can do in spatial dimensions. The metric quoted earlier by DaleSpam works regardless of...

Very well. Let's focus now on coordinate view of spacetime. Can there be a stationary object in expanding spacetime? Distance between every body in spacetime increases with time without any apparent force and independent of their respective speeds and there seem to be even acceleration of this...

According to SR time "flows" at different rates according to the speed of the object. So time is relative to the speed, and speed is also relative to the observer. If I start to move at certain speed and also take a role of the observer (of myself) than for me time will be passing at normal...

Nice :smile:, but is this a definition of timelike dimension? It looks to me as a description of spacetime and it doesn't say anything about why there is a minus sign before time component.

You are probably right, but its kind of mixed topic. I'm trying to determine if that what we perceive as passing time can in reality be the effect of expanding spacetime and in accordance to that, if a gravity is just the local effect of mass on the rate of this expansion.

How do you define timelike dimension? What is different about it in accordance to plain dimension and how do you know there is only one?

Volume increases with power of 3 with radius, and gravity decreases with power of 2 with radius. Value of gravity is determined by mass for a given volume. Within solid body starting from its center and going outwards volume increase adds more mass and overpowers gravity's decrease with...

If bodies B and C have the same mass but body C is twice the density of B, than body C has smaller radius then B. So distance between A and the centers of B/C as stated is the same, but the distance from A to the surface of B is less then to the surface of C. As gravity of the body fades with...

My assumption that time is a part of spacetime is rather simple. Mainly because it's space-time and because time is influenced along with space when spacetime is bend by gravity. By flow of time I meant that there is an order of succession of things, there is an irreversible entropy and you...

Time is integral part of spacetime. If so, how would you explain the persistent unidirectional and significant flow of time and such a small dilation when time is influenced by spacetime manipulation? Does time flow have to do with overall spacetime expansion?