- #1
Alpharup
- 225
- 17
I have learned that the universe came from big bang and it's expansion is accelerating...Now let us assume that there is only one universe and that there is no multiverse...
According to postulates of relativity, in any frame of reference, no body can travel faster than the speed of light...Let the cosmic speed limit be 'c'...
Now since we are present in universe, space can only exist in the universe...Outside the universe, space doesn't exist...
Let the magnitude of acceleration of universe be 'a'...
My question is "what is the speed of expansion of the universe just after the big bang?"...My argument is that the speed of expansion of the universe just after big bang is greater than or equal to 'c'...
Let us consider that the speed of expansion of the universe just after big bang is less than 'c'...Let the time after the big bang at which the speed of expansion of the universe becomes 'c' be 't'...
Let us consider that we have have a torch between the times '0 'and 't' at the edge of the universe...When I light up the torch, the light travels a speed of 'c'(According to the special relativity postulate) which is greater than the speed of expansion of the universe..ie...light travels out of the universe...ie...it travels in the absence of space...This is in contradiction to the fact than matter can exist without space...Einstein's postulate is not in contradiction to the fact that space expands faster than light...But here the speed of light is greater than the rate of expansion of space...This is a contradiction that matter(light) can exist without space...So the big gang theory itself is wrong is if we assume that the speed of expansion of the universe just after big bang is less than 'c'...
Now let us come to a point...If the big bang theory were true if the speed of expansion of the universe just after big bang is less than 'c', we have a possibility;
Either the cosmic speed limit(c) varies with time and is always less than the speed of expansion of universe at any point of time...Say, If the speed of expansion of the universe after time 0.2 seconds is 1 m/s, then the cosmic speed limit at that time,ie...the speed of light(Special Relativity postulate) at that time will always be less than 1 m/s(say 0.99 m/s)...This is not against the special theory of relativity(Because all other objects must travel at a speed less than 0.99 m/s at that instant)
Don't get me wrong..We can modify a postulate of special relativity like "Nothing can travel faster than the speed of light which is the maximum cosmic speed limit at that time in any frame of reference"
But it is highly probable that you won't accept my idea...So we can mostly discard it...So, we have another option of modifying big bang theory itself...But it is speculated that there is high evidence for support of this theory by analyzing red shifts from the movement of galaxies in space...So, the possibility of modifying the big bang theory is highly ruled out...
So, the idea of speed of expansion of the universe just after the big bang being lesser than the speed of light(c) can be ruled out..Hence I suggest that the speed of expansion of the universe just after the big bang is greater than the speed of light(C)..
Now they speculate that the universe has accelerated expansion..If so, what is the magnitude of that acceleration? What is the present speed of expansion of the universe?
According to postulates of relativity, in any frame of reference, no body can travel faster than the speed of light...Let the cosmic speed limit be 'c'...
Now since we are present in universe, space can only exist in the universe...Outside the universe, space doesn't exist...
Let the magnitude of acceleration of universe be 'a'...
My question is "what is the speed of expansion of the universe just after the big bang?"...My argument is that the speed of expansion of the universe just after big bang is greater than or equal to 'c'...
Let us consider that the speed of expansion of the universe just after big bang is less than 'c'...Let the time after the big bang at which the speed of expansion of the universe becomes 'c' be 't'...
Let us consider that we have have a torch between the times '0 'and 't' at the edge of the universe...When I light up the torch, the light travels a speed of 'c'(According to the special relativity postulate) which is greater than the speed of expansion of the universe..ie...light travels out of the universe...ie...it travels in the absence of space...This is in contradiction to the fact than matter can exist without space...Einstein's postulate is not in contradiction to the fact that space expands faster than light...But here the speed of light is greater than the rate of expansion of space...This is a contradiction that matter(light) can exist without space...So the big gang theory itself is wrong is if we assume that the speed of expansion of the universe just after big bang is less than 'c'...
Now let us come to a point...If the big bang theory were true if the speed of expansion of the universe just after big bang is less than 'c', we have a possibility;
Either the cosmic speed limit(c) varies with time and is always less than the speed of expansion of universe at any point of time...Say, If the speed of expansion of the universe after time 0.2 seconds is 1 m/s, then the cosmic speed limit at that time,ie...the speed of light(Special Relativity postulate) at that time will always be less than 1 m/s(say 0.99 m/s)...This is not against the special theory of relativity(Because all other objects must travel at a speed less than 0.99 m/s at that instant)
Don't get me wrong..We can modify a postulate of special relativity like "Nothing can travel faster than the speed of light which is the maximum cosmic speed limit at that time in any frame of reference"
But it is highly probable that you won't accept my idea...So we can mostly discard it...So, we have another option of modifying big bang theory itself...But it is speculated that there is high evidence for support of this theory by analyzing red shifts from the movement of galaxies in space...So, the possibility of modifying the big bang theory is highly ruled out...
So, the idea of speed of expansion of the universe just after the big bang being lesser than the speed of light(c) can be ruled out..Hence I suggest that the speed of expansion of the universe just after the big bang is greater than the speed of light(C)..
Now they speculate that the universe has accelerated expansion..If so, what is the magnitude of that acceleration? What is the present speed of expansion of the universe?