
QuickSearch
Welcome! You are not logged in. [ Login ] 
EvC Forum active members: 67 (9049 total) 
 
Wes johnson  
Astrophile  
Total: 887,592 Year: 5,238/14,102 Month: 159/677 Week: 18/26 Day: 0/6 Hour: 0/0 
Thread ▼ Details 
Member (Idle past 423 days) Posts: 20714 From: the other end of the sidewalk Joined: 

Thread Info



Author  Topic: Did a 5D black hole brane event horizon make the universe?  
RAZD Member (Idle past 423 days) Posts: 20714 From: the other end of the sidewalk Joined: 
I came across this article from Banoosh
Goodbye Big Bang, Hello Black Hole? A New Theory Of The Universe’s Creation Now I find Banoosh to be a resource of questionable trustworthyness (a lot of conspiracy theories for instance) so I looked up their links quote: The Arvix link is short: quote: That is just the abstract, but there is a link to download the PDF version  note this is on the technical side ... The other link is to the Nature article: Did a hyperblack hole spawn the Universe? quote: And then the "Bulk Universe" is a "bulk brane" around a black hole in a megabulk universe ... and it's turtles all the way down ... or you can think of it as a shell game where each universe is a "russian doll" inside another "russian doll" ... Enjoy by our ability to understand Rebel American Zen Deist ... to learn ... to think ... to live ... to laugh ... to share. • • • Join the effort to solve medical problems, AIDS/HIV, Cancer and more with Team EvC! (click) • • •


AdminNosy Administrator Posts: 4754 From: Vancouver, BC, Canada Joined:

Thread copied here from the Did a 5D black hole brane event horizon make the universe? thread in the Proposed New Topics forum.


Son Goku Member Posts: 1181 From: Ireland Joined:

I read the paper. It's actually a cool idea. Basically they studied in detail the dynamics of what happens when very heavy stars collapse to form black holes in a universe with four dimensions*.
In threedimensions, when a star collapses, the outer layers get blown out into space and the inner layers collapse to form a black hole. The black hole being surrounded by the twodimensional surface know as the event horizon. The surface past which light cannot escape. However the authors have found that this isn't what happens in fourdimensions. The inner layers collapse into a black hole and are surrounded by a threedimensional event horizon. However all of the outer layers don't explode out randomly into space like they do in three dimensions. Some of the outer layers form a thinsheet, a three dimensional sheet, that looks like an extra layer on top of the event horizon. This sheet then expands slowly away from the star, as it has enough momentum to escape the collapse. It turns out that this sheet, when taken as an object on its own, is identical to the Big Bang solution of General Relativity in threedimensions. So an entity living on this sheet would see data consistent with there being no fourth dimension and everything originating from a point in the distant past. Usually the singularity in General Relativity is taken to mean some approximation or assumption is breaking down. This model would say that as we rewind time we eventually reach a point before the star collapsed and our universe merges with the other layers of the star and can no longer be considered an independent object. In essence, this model says our universe is "really" a slowly expanding bubble of stellar material, one of the mid layers of a hyperstar** that went supernova. The gravity of the black hole that that star collapsed into keeps the layer compressed and effectively threedimensional, but the energy of the supernova blast gives it enough velocity to slowly escape from the black hole and so it expands. Living inside this sheet, we perceive this expansion as the cosmological expansion of a threedimensional universe. I think the idea is in too early a stage to comment on. The author wants to do better simulations to see if it matches current cosmological data. The model currently matches some observations, but the threedimensional universe this model produces is scale invariant. Basically its Cosmic Microwave Background (CMB) has an equal number of photons of each energy. Where as our universe shows slightly more photons at some energies. However it's possible this model does produce a universe like ours, but the current methods of analyzing it are too weak to demonstrate this, or perhaps depending on the conditions in the hyperstar the threedimensional universe has different CMBs. *I'm ignoring time in this post. **Hyperstar refers to the fourdimensional star. Edited by Son Goku, : No reason given.


AZPaul3 Member Posts: 6020 From: Phoenix Joined: Member Rating: 3.7

Thanks, Son. This is good stuff. One question if I may, and this may also be too early to discuss. Does, or how could, this model explain the accelerated expansion we see in the supernovae data? Dark energy still or some other mechanism?


Son Goku Member Posts: 1181 From: Ireland Joined:

Well the interesting thing is that accelerating expansion and Dark Energy naturally fall out of the model.
Our universe, which according to this is simply a "sphere" of material slowly escaping from a dead hyperstar's black hole, has its size increase as it escapes the black hole. The interesting thing is that this expansion naturally accelerates. The basic laws of physics in the higher dimensional universe dictate that a spherical shock wave of material accelerates as it moves away from the black hole. To beings living inside the shock wave (i.e. us), the only way they could model this expansion without reference to the higher dimensions is by introducing an additional Dark Energy term into General Relativity. In essence in this model, there is no mechanism for the accelerating expansion besides basic kinematics. Spherical shells of supernova debris simply naturally accelerate away from a fourdimensional black hole. Edited by Son Goku, : No reason given. Edited by Son Goku, : No reason given.


Diomedes Member Posts: 972 From: Central Florida, USA Joined: 
I am curious: does this imply that our universe is, in and of itself, a 'bubble' within another four dimensional universe of some type? I'm also a little confused with regards to three dimensional universes versus four dimensional universes. Is the 'fourth dimension', as implied in this case, not the dimension of time but something else? And a final question: since spacetime is a fundamental construct of our universe, isn't our universe already a four dimensional universe?


Son Goku Member Posts: 1181 From: Ireland Joined: 
If his theory is correct, then yes that is exactly what it implies. I should say that what interests me most here is that the author derived explicit predictions from his model. Things we can check over the next few years. Unlike a lot of models which try to explain the Big Bang which often simply paint some vague idea with some mathematics without any solid predictions.
It's an extra spatial dimension.
In my post I said that I wouldn't include time, as it wasn't necessary to understand this model. However correctly our universe is 3+1dimensional. This model says we might be a bubble in a 4+1 dimensional universe. The 3+1 notation is often used to indicate that we have four dimensions but one of them is different to the others.


Diomedes Member Posts: 972 From: Central Florida, USA Joined: 
That clears things up. I appreciate the clarification. I have no idea how another spatial dimension would manifest, but then again, I am not a four dimensional being! It makes me wonder: if our universe (3+1) is essentially a 'bubble' within another, larger (4+1) universe, are there other (3+1) universe bubbles also in existence and if so, can they interact? i.e. collide?


jar Member Posts: 33438 From: Texas!! Joined: Member Rating: 2.9 
Have you read Flatland?
Anyone so limited that they can only spell a word one way is severely handicapped!


New Cat's Eye Inactive Member 
The best way I found to get a grip on it is to go the other way, dimension reductions, see what that entails, and then try to imagine rewinding that until you get back past three dimensions into the fourth. You're never really going to be able to "picture" 4 spatial dimensions though, because our brains just don't work that way. Anyways, here we go: A cube is three dimensions. If you reduce a cube by one dimension, then you get a square. A square is like looking straight at one side of a cube. If you hold a dice just right in front of you so you can only see one side of it, then it will look like a square. A square is two dimensions. If you reduce a square by one dimension, then you get a line. A line is like looking straight at one edge of a square. If you hold a piece of paper just right in front of you so you can only see one edge of it, then it will look like a line A line is one dimension. If you reduce a line by one dimension, then you get a point. A point is like looking straight down the length of a line. If you hold a pencil just right in front of you so you can only see it pointing at you, then it will look like a point. A point is zero dimensions. Now, what about a four dimension object, a hypercube. Well that is the object that if you reduce it by one dimension then you will get a cube. If you look down one section of the hypercube, then you will see a cube. So imagine how you can take a point, and drag it into one dimension to create a line. Then you can drag that line into a second dimension to create a square. Then you can drag that square into a thrid dimension to make a cube. Then you could drag that cube into a fourth dimension to make a hypercube. Like I said, that's not really going to help you "picture" it in your head, but hopefully you can get what it means to have one.


Diomedes Member Posts: 972 From: Central Florida, USA Joined: 
Have not read it, but I know of it. They actually indirectly referenced the concept in one of the episodes of the Big Bang Theory. That reminds me: I recall reading a sci fi short story years ago about a vacuum instability event (I think that is what they called it) where the universe's inherent 'energy state' actually shifted. (Like an electron changing energy states) This changed the fundamental laws of physics in the universe and most advanced devices stopped working. Interesting take on a theoretical premise, although I believe even a minor shift in any of the fundamental forces would basically negate all current life and drastically change the nature of the universe as a whole.


RAZD Member (Idle past 423 days) Posts: 20714 From: the other end of the sidewalk Joined: 
http://www.geom.uiuc.edu/~banchoff/Flatland/
I've also written a spoof Enjoy by our ability to understand Rebel American Zen Deist ... to learn ... to think ... to live ... to laugh ... to share. • • • Join the effort to solve medical problems, AIDS/HIV, Cancer and more with Team EvC! (click) • • •


TryingToBeLogical Junior Member (Idle past 2582 days) Posts: 10 From: Clermont, Florida, USA Joined: 
Here's something that's been bugging me about the Big Bang. Where did the energy that caused it come from? And don't try telling me it was already there. The current theory is that it was all compressed to a ball of nearnothingness; logic dictates that, as temperature tends to decrease with mass, this sphere must have been at pure Absolute Zero. There WAS no energy for it to do anything; it was simply there. But all that pressure reduced the atoms to nothingness, still pushing to be freed from nonexistent bounds. So where did the energy come from? Where did the mass originate?
The answer, as it turns out, might lie in gravity and dark matter. Gravitational potential energy is a negative value; if it wasn't, we'd all be pushed AWAY. But this means that this is actually 'antienergy', as it might be termed, and therefore, is a negative value in the gigantic equation of the Universe. Averaging out the gravitational potential energy with every positive and negative energy value in the universe may very well result in Absolute Zero; thus, there is a loophole in the Law of Conservation of Energy. The same applies to matter; anti or dark matter could well be a negative value to 'regular' forms of matter, and thus, average out to Nothing once the equation is complete. The implications are troubling. Therefore, thanks to this little loophole, it's entirely possible that all of existence  no matter how impressive or enormous  may simply be the twin complex roots in a quadratic or cubic equation of truly mindbending proportions. It's the mathematical concept of redefining zero, where you get around the lack of actual roots in a quadratic equation by completing the square with equal positivenegative values. We may be simply +4242. Makes you think, doesn't it? Logic is the ultimate argument; for none can refute logic with anything but logic. Thus, you will always walk away satisfied if you stay logical, knowing either you're right, or you're wrong.


NoNukes Inactive Member 
Temperature decreases with mass? That is complete nonsense. Whatever caused you to say that? Wow. That's some really bad physics. And why introduce a concept of antienergy? I understand what you are getting at when you suggest that the total energy in the universe might be zero. But dark matter is not antimatter. Not sure why you said that. And redefining zero? There is a grain of truth in what you posted but the majority of it seems to be wrong. Even your completing the square stuff, which is basic algebra is misguided nonsense. Quadratic equations always have roots even if those roots are doubled, or are complex, or are zero. In any event, there is a pretty long thread about the possibility that the total energy of the universe is actually zero, and the key is Gravitational potential energy as you did mention. It might be interesting for you to see how a Creationist argues in that thread. Under a government which imprisons any unjustly, the true place for a just man is also in prison. Thoreau: Civil Disobedience (1846) I have never met a man so ignorant that I couldn't learn something from him. Galileo Galilei If there is no struggle, there is no progress. Those who profess to favor freedom, and deprecate agitation, are men who want crops without plowing up the ground, they want rain without thunder and lightning. Frederick Douglass


TryingToBeLogical Junior Member (Idle past 2582 days) Posts: 10 From: Clermont, Florida, USA Joined: 
Frack, sorry. I messed up big time, didn't I?
Anyway, as it is, thermal energy would increase as the mass it was contained in decreased, correct? Thus, the Big Bang contained the absolute energy of the universe, right? But the key is that that energy couldn't have come into existence on its own. The problem is where all this matter and energy originated. Also, we don't know a damn thing about dark matter. It's just a theory, and antimatter, well, we all know the destruction that can cause. The point being, based on the theory of relativity, isn't it entirely possible that you could transform a negative energy value into a negative mass value? Therefore, it is also possible that mass can exist as a negative. The logical conclusion as to the identity of this (keeping in mind that this is all just postulation) antimatter would be the single most mysterious form of matter in the known universe. Hence, dark or anti matter. Does that clear things up a bit? I don't know WHAT I was thinking with the Absolute Zero thing. Sorry... Logic is the ultimate argument; for none can refute logic with anything but logic. Thus, you will always walk away satisfied if you stay logical, knowing either you're right, or you're wrong.



Do Nothing Button
Copyright 20012018 by EvC Forum, All Rights Reserved
™ Version 4.0 Beta
Innovative software from Qwixotic © 2021