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Our universe: An expanding bubble in an extra dimension
Posted on 12/29/18 at 3:06 pm
Posted on 12/29/18 at 3:06 pm
I should have followed the science path. This stuff just intrigues me !
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We have known for the past 20 years that the Universe is expanding at an ever accelerating rate. The explanation is the "dark energy" that permeates it throughout, pushing it to expand. Understanding the nature of this dark energy is one of the paramount enigmas of fundamental physics.
It has long been hoped that string theory will provide the answer. According to string theory, all matter consists of tiny, vibrating "stringlike" entities. The theory also requires there to be more spatial dimensions than the three that are already part of everyday knowledge. For 15 years, there have been models in string theory that have been thought to give rise to dark energy. However, these have come in for increasingly harsh criticism, and several researchers are now asserting that none of the models proposed to date are workable.
In their article, the scientists propose a new model with dark energy and our Universe riding on an expanding bubble in an extra dimension. The whole Universe is accommodated on the edge of this expanding bubble. All existing matter in the Universe corresponds to the ends of strings that extend out into the extra dimension. The researchers also show that expanding bubbles of this kind can come into existence within the framework of string theory. It is conceivable that there are more bubbles than ours, corresponding to other universes.
Article here : ScienceDaily
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We have known for the past 20 years that the Universe is expanding at an ever accelerating rate. The explanation is the "dark energy" that permeates it throughout, pushing it to expand. Understanding the nature of this dark energy is one of the paramount enigmas of fundamental physics.
It has long been hoped that string theory will provide the answer. According to string theory, all matter consists of tiny, vibrating "stringlike" entities. The theory also requires there to be more spatial dimensions than the three that are already part of everyday knowledge. For 15 years, there have been models in string theory that have been thought to give rise to dark energy. However, these have come in for increasingly harsh criticism, and several researchers are now asserting that none of the models proposed to date are workable.
In their article, the scientists propose a new model with dark energy and our Universe riding on an expanding bubble in an extra dimension. The whole Universe is accommodated on the edge of this expanding bubble. All existing matter in the Universe corresponds to the ends of strings that extend out into the extra dimension. The researchers also show that expanding bubbles of this kind can come into existence within the framework of string theory. It is conceivable that there are more bubbles than ours, corresponding to other universes.
Article here : ScienceDaily
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Posted on 12/29/18 at 9:21 pm to Trumansfangs
Assuming your pic and the info in the article is accurate, this would mean as above so below that was talked about by alchemists centuries ago were correct.
Below, electrons revolving around the nucleus. Above planets revolve around suns, solar systems around a central mass to form a galaxy, and above that universes revolving around something else?
Pretty weird to think about
Below, electrons revolving around the nucleus. Above planets revolve around suns, solar systems around a central mass to form a galaxy, and above that universes revolving around something else?
Pretty weird to think about
Posted on 12/30/18 at 4:16 pm to thatguy45
Zosimos of Panopolis seemed pretty cool ;)
Posted on 12/30/18 at 6:00 pm to Trumansfangs
Why couldn’t it just be momentum from the Big Bang still pushing the expansion?
Posted on 12/30/18 at 9:40 pm to KSGamecock
Because the most distant objects are further away than they've had time to reach since the big bang.
Posted on 12/30/18 at 9:57 pm to OldSkool
Hmmmmmmm very interesting.
Posted on 12/31/18 at 1:11 pm to Trumansfangs
quote:
We have known for the past 20 years that the Universe is expanding at an ever accelerating rate. The explanation is the "dark energy" that permeates it throughout, pushing it to expand. Understanding the nature of this dark energy is one of the paramount enigmas of fundamental physics.
Well, maybe. Since we don't know what dark energy is or where it originates, it's very bold to say that it's the cause of the expansion of the Universe.
Some scientists think that the repulsive force of dark energy overcame the attractive force of gravity 5-6 billion years ago. This caused the runaway acceleration that we see today. The Universe had been expanding since the Big Bang, but gravity had held dark energy in check to some extent until its effect was weakened by distance.
quote:
It has long been hoped that string theory will provide the answer. According to string theory, all matter consists of tiny, vibrating "stringlike" entities. The theory also requires there to be more spatial dimensions than the three that are already part of everyday knowledge.
In the 1990s, Edward Witten showed that all competing string theories were just different aspects of one theory, now called the Super String Theory. His work has spawned research by others, leading to many ideas about the workings of strings. LINK
Posted on 12/31/18 at 6:30 pm to Kentucker
Check this out my friend. I found it very interesting...
Dark energy may be incompatible with string theory
Dark energy may be incompatible with string theory
Posted on 12/31/18 at 10:03 pm to Trumansfangs
quote:
A discovery of quintessence would revolutionize fundamental physics and cosmology, including rewriting the cosmos’s history and future. Instead of tearing apart in a Big Rip, a quintessent universe would gradually decelerate, and in most models, would eventually stop expanding and contract in either a Big Crunch or Big Bounce.
I like this conjecture. It seems reasonable to think that the spacetime field, which generates gravity, would exert a constant effect upon dark energy. And if dark energy is weakened by the expansion of spacetime, gravity would once again dominate it as it did in the epochs just after the Big Bang.
Posted on 1/1/19 at 2:45 pm to Kentucker
The contraction of "The Big Bounce" might sting. :)
The idea of expansion and contraction that could cycle forever is enthralling to me.
The idea of expansion and contraction that could cycle forever is enthralling to me.
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