A Question About Cosmology and a Theoretical Fifth Dimension

Question(s): Dear astronomy / physics student whose job it is to filter through the department in-box,  I find when I approach supersymmetry from a macro perspective, there seems to be an equalizing, but inherently non-identifiable component at work, but still remains largely overlooked. From my research of the work in the field, it seems like some very gifted scientists are getting very close to grasping the key, but still more work remains to attain success.

Question 1:  The general model of the universe (contemporarily speaking) is comprised of a four dimensional manifold: x,y,z, and t.  xyz store information, and t of course is the property of time. How would our understanding of the universe change if there was a fifth component to that manifold, or a 5 manifold / dimension universal model? Where xyz, and t still represent the same properties in the aforementioned, but the fifth component’s property is to repel all information while being devoid of any properties. Would this then serve as a theoretical reference point for, or balance to information and tangible dimensional properties – by defining and establishing the lack thereof.

To help frame the concept, I give you the following example abstraction:

If you think about the concept of “one”, it exists only because it is complementary and set apart from “zero “or “none”.    “One” cannot exist if there was not a means to provide distinction, and therefore purpose. “Zero” or “none” in this context is to repel / reject any ascribed property or value, thus it can leverage the existence of “one”.  The symmetrical value of “one” is “-one” and so on. “One” can be incremented in a positive or negative direction, and be proportioned. However, the model is only stable because of “zero”.

Question 2:  Applying the construct of a 5th dimension to the physics of a black hole:  Could we assume that the 5th dimensional properties serve to precipitate “dark energy” into the universe as function of concentrated matter / information introduced to the black hole?   Not necessarily depositing the dark energy somewhere else, but everywhere at once. Or at least everywhere there are lower space-time densities (voids is supercluster webbing, as well as fundamental particle isolation mechanisms).  Could a proportion be drawn between the rate of expansion Vs. the aggregate rate and quantity of information introduced to black holes everywhere?

— Rob

Answer(s): In answer to your questions, there has been some theoretical research into the properties of a hypothetical fifth dimension on our view of the cosmology of the universe.  See a research paper by Bahrehbakhsh, Farhoudi, and Vakili for details.  The scenario that they derive for the effects of a fifth cosmological dimension are not quite those you surmise, but they are similar.  In particular, this research article investigates the predictions of such a cosmology with a fifth dimension on our measurements of dark energy in the universe.

Jeff Mangum

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What Does the Expansion of the Universe Look Like from an Galaxy on the Edge of the Known Universe?

Question: If you were to project yourself instantly to the edge of the known universe, (knowing that the universe is expanding at or near the speed of light from this perspective) and you were to take a telescope and look towards our galaxy, should you not see our galaxy moving at the same speed as we we see the galaxies from our perspective from here?  Since everything moving is measured from our perspective, how can we surmise that we, moving at “x” speed from this point of view is not really moving at or near the speed of light looking from the edge of the universes point of view?  — Louis

Answer: The answer to this question rests on the tricky nature of the expansion of the universe.  A simple model that is not strictly correct but is a good enough approximation is that everything in the universe is moving away from everything else.  In other words, think of it as space being created between all objects everywhere, thus looking like everything moving away from everything else.  Therefore, as soon as you go to the edge of the known universe, you go to a place that is at rest in the observer’s reference frame, just like the reference frame that we sit in here on Earth.  You would see the same universal expansion at the far-away galaxy as you see here in our own Milky Way galaxy.

Jeff Mangum

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What if the Big Bang Started as a Gigantic Supernova and Associated Black Hole?

Question: A cosmological “what if ”
Here’s my question:

suppose for the sake of argument, the big bang happened somewhat differently, that it was like a huge mega supernova, and created super-duper massive black hole. A universal black hole. THE black hole of the entire known universe!

slowing down all the stuff that blew away from it.
the stuff coalesced into galaxies which are all still expanding away from each other.

such a scenario would have all the galaxies at different heights in a huge potential well. now…if our galaxy were further up such a potential well, all the light from all the galaxies further down would be red shifted.

also photons emitted from those galaxies would not only come ‘straight’ up the potential well but also would spiral up the potential well.

If our galaxy were near the ‘top’, light from one galaxy would reach us from many directions, all such photons would be red-shifted, and would have taken different lengths of time to reach us because of the many different spiral geodisics they could have taken. In other words, many of the galaxies we see could in fact be the SAME galaxy seen from a different direction in the sky and at vastly different times in its evolution as well as from its different orientations.

pretty much all the galaxies would appear to be receeding from ours (whether they are or not)

furthermore, between our galaxy and the more red-shifted ones further down the well,  the space-time would become more and more stretched the further away from our galaxy you’d go.
And therefore it would appear that the expansion of the universe was therefore ‘speeding up’.

Thus explaining the embarassing ‘dark’ energy issue.

In other words, all the distant galaxies might not be ‘spread out’ over the night sky as they appear to be, but instead be all more or less in the same ‘direction’ (downwards), in one and the same huge potential well of “THE” black hole of the entire Universe, that would make a galactic supermassive black hole look like an electron neutrino!

There would be no ‘center’ because any such center would be in all directions, it would therefore be ‘spread out’ as the surface of a sphere.

So maybe therefore, our view of the universe has been ‘inside out’ as it were.

This view seems consistent with general relativity.

How would we know? observationally, how could we tell the difference?
(it sure would explain the ‘dark’ energy /cosmic acceleration issue, plus it’s a lot less absurd)

— Tom

 

Answer: I think that your scenario has one basic flaw in that if the giant supernova which led to the “central” black hole did exist, we would observe a “source” or center for the overall expansion of the universe.  In fact, what we see are all galaxies (excluding local gravitational interactions between galaxies located near each other) moving away from each other rather than moving away from a common point.  You might want to take a look at some of the questions and answers that have been posted to the cosmology section of this blog for further information.

 

Jeff Mangum

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Alternate Theories for the Expansion of the Universe

Question(s): I have three related questions:

  1. The redshift of objects indicates that the farther away they are, the faster they’re moving, but wasn’t the observed light emitted millions of years ago, when the object wasn’t so far away?  How do we know what velocity it’s moving at now, or if it’s even there?  Have we measured the velocities of known objects over ‘long’ periods of time to see if their velocities are changing, either speeding up or slowing down?
  2. Rather than a ‘big bang’ with the Universe being created and expanding into nothing, isn’t it possible that it was a ‘big bubble’ similar to nucleate boiling, and that we are surrounded by ‘stuff’ into which we’re expanding?
  3. If we are expanding into stuff,  couldn’t the cosmic background radiation be coming at us from outside the boundaries of our Universe?  Could ‘dark’ energy and matter be external also?  — Larry

Answer(s):

  1. You are correct in that the light emitted from distant objects that we observe today was emitted from the distant object in the past, its speed in getting to us limited by the speed of light.  We do not have a way to measure an object’s velocity “now”, but we can measure the velocities of objects at a range of distances from us.  This allows us to sample the expansion rate of the universe at a range of distances, and therefore measure the speed-up or slow-down of the universe’s expansion.
  2. The suggestion that the universe is expanding into other “stuff”, like any alternate theory of the expansion of the universe, requires a way to test its observables.  This is the problem with most alternate theories.  How would you measure the “stuff” into which our universe is expanding?  I don’t believe that it is possible to measure the material into which we might be expanding, so this alternate theory really is not viable.
  3. I am not aware of any observations which would allow for the cosmic microwave background and dark energy to be derived from an external body of matter.  At this point, this would be a theory which lacks observations to support it.

Jeff Mangum

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Do Black Holes Create Dark Energy?

Question: Hi, my name is Kemp and I just finished watching a program from the Discovery Channel entitled “Understanding the Universe”. The program triggered an odd question, do blackholes create dark energy and/or dark matter relative to their size?  — Kemp

Answer: No.  The only connection between black holes and dark energy is the “darkness” of their names.  Black holes are sources of intense gravity from which even light cannot escape.  Dark energy is the theoretical entity that accounts for the majority of the energy content of the universe and is responsible for the overall acceleration of the expansion of the universe.

Jeff Mangum

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Questions About Cosmology and Catching Near Earth Objects

Question #1: Hello there! Sorry for the previous thing I had sent, it was merely a comment. I am a 16 year old high school student who is interested in the study of the stars and our universe itself.  And I also have a theory to which, I would highly appreciate if you took the time to read it. You know the candle light variable used to measure the distance of us from a certain star? With that being said, there is also the situation of our universe expanding farther away, and the theory of how it will stop and come back to it’s center of where it began, which is where the Big Bang theory comes from. Now, I know this sounds a bit crazy. But hear me out. Since our entire universe is made up of dark matter, also a compound in the creation of our universe with the gas and dust that creates stars, the universe coming back together, crunching into one could cause another Big Bang. In which case, would be the same illusion as a star pulsating it’s light. What if we are only specs of particles and molecules created to make one big star? What if our whole universe if just one star as we know it, and there are billions upon billions of stars, that make up universes?  — Rachel

Answer #1: All theories, whether they be to explain the evolution of the universe or the properties of a star, require measurements to support them.  What measurements support your theory?  This is the key to any scientific investigation that involves theory which must ultimately be supported by observations.

 

Question #2: Also, I’d like to mention that I have an idea for a device that could be placed a certain distance away from Earth, enough not to mess with the gravitational pull, and take the near earth objects that could be potentially dangerous by coming to close and crashing in Earth. What if they made a device to take these potentially dangerous items and drag them away from Earths surface, and had a inside that could destroy the items inside? This device could also be used for meteorites, to pull them away from the Earth’s gravitational pull. Also, with delittering the area, you could catch more light in telescopes and would be allowed to possibly see things even farther than we ever have. Please message me back, telling me what you think!

Answer #2: How would this device collect meteoroids and potentially dangerous asteroids?  Note that the sheer number of meteoroids and asteroids that this device would need to collect would make any “scooping” device not practical.

 

Jeff Mangum

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Where is the Center of the Big Bang?

Question: My understanding is that the COBE experiments back in the late 80s/early 90s were successful in detecting what we generally believe to be the CMB leftover from the big bang.

In reading about the experiment I haven’t had much luck finding an answer about if COBE (or some other experiment) has been able to estimate a vector, or general location, for the big bang itself. Do we have any data that allows us to extrapolate where, geographically in the universe, the big bang might have been? Would this be a safe/fair location to consider the “center of the universe” if it were known?  — Tim

Answer: In fact, there is no “center” to the Big Bang.  The Big Bang was not an explosion which radiated from a point but rather an expansion of all points from all other points in the Universe.  One of the best pictorial descriptions of this fact can be found on Ed Wright’s Big Bang “nocenter” page.  This is part of the “cosmological principle, which states that all positions in the universe are equivalent, and that the universe is homogeneous.

Jeff Mangum

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How Can Gas Particles Stick Together to Ultimately Form Stars and Planets?

Question: There is a lot of acceptance that when the gases of the universe began to join and spin because of the impact of those collisions. That would mean that all particles hit in the same direction, like using your hand to spin a basketball on your finger. When one questions this I just get blank stares as if I’m suggesting some sort of heresy. But, apart from the difficulty I have with the Big Bang being possible on it’s own (Quantum Physics suggests you need an outside force) the answers I read about the formation of planets and gravity seems absurd yet I can’t find anyone to explain it without theory and conjecture. Can someone help me. Just to make it clear what I’m asking, please help me understand how gas particles flying in every possible direction as can form into a rotating ball that turns into rock because physics itself suggests that is impossible. I use the theory that is used for the formation of planets as….

“…there was a massive cloud of hydrogen gas left over from the Big Bang. Some event, like a nearby supernova explosion triggered a gravitational collapse of the cloud, causing the hydrogen atoms to attach to one another through mutual gravity. Each individual hydrogen atom had its own momentum, and so when the atoms collected together into larger and larger clumps of gas, the conservation of momentum across all the particles set these clumps of gas spinning.”

Now that is a lot of conjecture – considering collisions from every possible direction…let alone how those hydrogen gas particles, once collected together formed everything we have on and in the planet.

— Brent

Answer: I think that the slight misunderstanding in your logic is the equate “sticking” with the gravitational attraction between particles such as atoms, molecules, and dust particles, which ultimately results in the formation of more massive objects like asteroids, comets, planets, and stars.  It is not necessary for objects to collide and “stick” to each other immediately.  A stable cloud of massive particles that is affected by a nearby event that “pushes” on it, such as a nearby supernova, will potentially be pushed in such a way that gravity causes objects to slowly move closer to each other and ultimately coalesce.  This slow collapse of massive objects toward other massive objects ultimately builds on itself, collecting larger and larger massive objects.  This ultimately is a mechanism for forming objects like planets, stars, and galaxies.

Jeff Mangum

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What Lies Beyond the Known Universe?

Question: Do dimensions really exists? [Also,] are the black holes really or possibly portals leading to different dimensions (like a whole new universe or a totally different universe)?  [Also,] right now I read in the blog about like the diameter of universe being 96 billion light years (in other sense the universe being confined within these 96 billion light years diameter) so what lies beyond that diameter?  — Pravesh

Answer: One can speculate or theorize as to what exists beyond that which we can measure, but that is, strictly speaking, not science.  What scientists do is make observations of the universe and apply the laws of physics to those observations to interpret what they observe.  As there are no actual observations which can tell us what lies beyond a black hole or the edge of the universe, we can only speculate or theorize as to what might lie beyond what we observe.  To my knowledge there are no theoretical predictions which are based on physics which predict what lies beyond black holes or the edge of the universe, which leaves us only speculation, which is not science.  So, a scientist would answer that there is no information to tell us what lies beyond a black hole or the edge of the universe.

Jeff Mangum

 

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Can a Black Hole Become Unstable and Produce a “Small Bang”?

Question: Can a black hole become unstable and cause a “small bang”? Creating parallel universes? — Raoule

Answer: I don’t believe that there are any reliable theoretical calculations that produce this series of events.  In fact, I don’t believe that “unstable” black holes lead to explosions of any kind.

Jeff Mangum

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