Could the Visible Universe Be a Fuzzball in String Theory?

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In summary, the conversation discusses the possibility of the edge of the visible universe being the radius of an event horizon of a non-classical black hole known as a fuzzball. It is mentioned that fuzzballs do not necessarily have unimaginable densities and can have a radius of 77 astronomical units with a mean density equal to that of Earth's atmosphere. The idea of the visible universe being inside a fuzzball is further explored, with considerations of why strings in some regions may not condense into elementary particles, the possibility of smaller fuzzballs inside, and the role of infalling matter in the expansion of the universe. The conversation concludes by questioning the choice of the visible universe limit as the radius and its implications on the position of Earth in the
  • #1
Jonny_trigonometry
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Could the edge of the visible universe (13.7 billion light-years, where recession velocity equals light speed), be the radius of an event horizon of a non-classical black hole such as a fuzzball?

http://en.wikipedia.org/wiki/Fuzzball_(string_theory )

"Due to the mass-density inverse-square rule, all fuzzballs need not have unimaginable densities. There are also supermassive black holes, which are found at the center of virtually all galaxies. Sagittarius A*, the black hole at the center of our Milky Way galaxy, is 4.3 million solar masses. If it is actually a fuzzball, it has a mean density that is “only” 51 times that of gold. At 3.9 billion solar masses, near the upper bounds for supermassive black holes, a fuzzball would have a radius of 77 astronomical units—about the same size as the termination shock of our solar system’s heliosphere—and a mean density equal to that of the Earth's atmosphere at sea level (1.2 kg/m3)."

From this quote, a fuzzball (non-classical black hole) can have a radius of 77au, and have a mean density of 1.2 kg/m^3? Wow, doesn't it seem that there would be no reason for strings in some regions to stay non-condensed, but instead condense into elementary particles? Further, why couldn't there be elements in regions of this space? Even further, why can't there be many smaller fuzzballs inside? Now consider my thread topic. Why not? The mean density of the visible universe could be on par with that found in a fuzzball with the radius of the visible universe.

Furthermore, consider expansion. Could the reason for expansion be due to infalling matter? Much like what we observe as black holes devour matter surrounding them, if our visible universe is the inside of a fuzzball, then if it's gaining mass, its schwartzchild radius is expanding over time.

Now consider rapid expansion in the early universe. It could have been caused by the initial beginning of the black hole universe, sucking in its immediate surroundings, undergoing rapid expansion. It has slowed down since--though it's still gaining mass--because it's pulling in more energetic matter that it wasn't able to pull in at the beginning.
 
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  • #2
Why pick the visible universe limit for the radius? Wouldn't that imply we are in the center? Do you think that someone 13billion ly away will see an edge to the Universe 0.7billion ly away?

There are a lot of discussions in PF about whether the Universe is inside a BH of one kind or another.

https://www.physicsforums.com/archive/index.php/t-106841.html

I think the trick is coming up with an observation that requires the Universe to be inside a fuzzball ...
 
  • #3
Simon Bridge said:
Why pick the visible universe limit for the radius? Wouldn't that imply we are in the center? Do you think that someone 13billion ly away will see an edge to the Universe 0.7billion ly away?

you are absolutely right. I didn't think of that. Kind of makes the idea seem unworkable
 

What is the "Visible Universe a fuzzball"?

The "Visible Universe a fuzzball" is a concept in astrophysics that suggests that the entire observable universe is made up of a tangled web of strings known as "fuzzballs." These strings are thought to be the building blocks of the universe and are constantly vibrating, creating the appearance of particles and forces.

How does the "Visible Universe a fuzzball" theory differ from the traditional Big Bang theory?

The "Visible Universe a fuzzball" theory challenges the traditional Big Bang theory, which suggests that the universe began as an infinitely dense and hot singularity and has been expanding outward ever since. The fuzzball theory proposes that the universe has always existed in its current form, with no beginning or end.

What evidence supports the "Visible Universe a fuzzball" theory?

While the fuzzball theory is still a highly debated topic in the scientific community, there is some evidence that supports it. One piece of evidence is the observed behavior of black holes, which aligns with the fuzzball theory and suggests that they are actually made up of strings rather than singularities.

What implications does the "Visible Universe a fuzzball" theory have for our understanding of the universe?

If the "Visible Universe a fuzzball" theory is proven to be true, it would completely change our understanding of the universe and its origins. It would also have implications for other areas of physics, such as quantum mechanics and general relativity, as it would require a new framework for understanding these concepts.

What further research is being done to investigate the "Visible Universe a fuzzball" theory?

Currently, there is ongoing research and experimentation being conducted to further explore the fuzzball theory and its implications. This includes studying the behavior of black holes, conducting experiments with string theory, and analyzing data from cosmological observations. It is an active and exciting area of research in astrophysics.

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