It seems odd to me that on a BH merge that a significant portion of their total mass can be converted to Gravitational waves that are released outside the BH event horizon. Intuitively it would make sense if they were created from the impact and originated from the impact. Is this related to...
So my understanding of gravity in relativity is that it is the curvature of spacetime rather than a force in Newtonian physics. My understanding of gravitational waves are a disturbance of the spacetime curvature. Isn’t this fundamentally different from electromagnetic radiation? Does spacetime...
What about gravity waves themselves? Is it theoretically possible to create them? And if so encode information in them if u do? Because apparently they are the only thing that could escape from a BH
What if two black holes are spirally in towards each other? Could you hypothetically fly between them in such a way that the gravity on both sides net to zero? Or dip into into one BH event horizon and then allow the presence of the second BH to allow u to escape? Or possibly waiting right...
Thank you for the additional detail. I am seeing your point now. A part that is still not clear to me though, is that my understanding of OU was all that can at some point be seen while Visible Universe (VU) is all that we can currently see. I am not sure if you are talking about OU above or VU...
did you read the article?
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Fig. 9 Illustration of the event horizon, ℓ, during de Sitter expansion. The gray circle is the Hubble sphere and the red circle is the event horizon. The leftmost frame is today: a photon is just emitted (yellow dot), the Hubble sphere and event horizon coincide...
@Bandersnatch I suppose I was really talking about the Hubble sphere, but the Hubble sphere has a direct effect on the OU. The OU is just much harder to calculate.
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Fig. 4 Time sequence of the Hubble sphere (red circle) expanding to overtake a receding galaxy (blue dot) comoving with the...
Except our universe is currently expanding at an accelerated rate. which is covered quite clearly in the insights article Bandersnatch provided above. The OU decreases in those situations. our universe had massive inflation at the beginning and then most of our past history has had the rate of...
@phinds In order for a distance galaxy to be observed, a photon released from said galaxy has to enter a region of space that is not moving away from us >C due to the expansion of space. This is why we have an observable universe that can change in size depending on the rate of expansion...
Forgive my ignorance, but wouldn't "gravitational time dilation" be a factor considering the universe billions of years ago was more dense then universe of today?
But, as for a direct observation, I would imagine a change in red shift over time would be a much better value. An object...
Well, wouldn't the obvious answer be that matter and antimatter annihilate each other? I see there only being two possibilities. 1. there is some kind of imbalance that has caused the entire universe to be dominated by matter versus antimatter. or 2. there is an imbalance in the distribution of...
Well, it actually does matter. but, the significance of our observable universe being dominated by matter or antimatter would depend on 1. the relative size of our observable universe to the entire universe and 2. the matter and antimatter composition of the entire universe. Now, it is a very...
is 15 billion years really enough time for matter that was almost uniform to have formed into the structures of today? There is a lot of empty space between galaxies today and this movement initially would have been very slow at the start when the density was close to uniform. Would part of the...
Well we certainly have good evidence above that the observable universe is dominated by matter, but does this really tell us anything about the entire universe? if the size of our observable universe compared to the entire universe is comparable to the size between our solar system and the milky...
Hubble constant Ho has been measured to be about 67 from some sources and around 73 from other sources. But, the values is the recessional velocity of an object due to universal expansion in the units of Km/s per megapersec (so somewhere from 67 to 73 Km/s per megapersec)...