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 Curious
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  • 17 votes cast
Feb
29
awarded  Curious
Feb
14
comment What caused gravitational waves detected by LIGO?
- but did they actually know when it will come for this particular merger, at least approximately? - did Einstein calculate the signal for this specific merger or in general for similar events? All this is beyond mind blowing.
Feb
14
comment What caused gravitational waves detected by LIGO?
Ok, that's cute. But how much does it match what they have predicted? And is the signal still coming?
Feb
13
comment What caused gravitational waves detected by LIGO?
So are these different waves already calculated theoretically and are now confirmed experimentally? Or were they just trying to detect something, whatever distortion and then looking what might have caused it. Also, is this signal still coming and this chirping frequency is still moving the instruments as we speak?
Feb
13
asked What caused gravitational waves detected by LIGO?
Nov
7
comment Gravitational red hift vs Doppler redshift: Is the universe really expanding?
Added to original question.
Nov
7
revised Gravitational red hift vs Doppler redshift: Is the universe really expanding?
added 434 characters in body
Nov
7
asked Gravitational red hift vs Doppler redshift: Is the universe really expanding?
Nov
3
awarded  Yearling
May
10
awarded  Nice Question
Dec
29
comment Universe as 2d sphere surface - a round trip?
Yes I meant the expanding balloon analogy. It's hard to connect the baloon one with Ω=1 here, and think it describes the same universe. If it expands endlessly, like on this sheet here, does that mean that balloon in expanding so fast, we could never made a round trip?
Dec
29
awarded  Peer Pressure
Dec
29
asked Universe as 2d sphere surface - a round trip?
Dec
28
comment The multiverse spacetime paradox?
I do understand this concept of 2D analogy very well. However our universe is 4D, therefore multiverse could only be 5D or more. Or we run into a paradox that was in my original question.
Dec
28
comment What is the difference between our time and space time?
How is it impossible to imagine? Isn't it it just a 3d space that can change over 4th dimension (time)?
Dec
27
comment The multiverse spacetime paradox?
Multiverse theory is speculative or the way I asked about the position of parallel universes in such multiverse?
Dec
27
asked The multiverse spacetime paradox?
Jan
10
comment What is the physical, geometric shape of the universe?
The answer in your first comment is the most precise I heard so far. Now I would like to dig even more :) I understand how 3-sphere "works", but not how it would look like as that "gluing" would lead to some heavy distortions of the "outer" sphere, which would heavily distort the objects inside (imagine a fish in connected spherical containers), but I do get the idea. Is this then 4D geometrical shape?
Jan
10
accepted What is the physical, geometric shape of the universe?
Jan
8
comment What is the physical, geometric shape of the universe?
Ok, to simplify to the lowest point I can imagine. Universe inflated to the size of about a solar system at the end of inflationary period, somewhere at 10 -32 seconds. Was it more of a disk or a ball shape then, or something else?