Unfortunately, I can't quite identify your teeny-weeny emoji!
However, theoretical physicists are serious when they talk about a world of particles, cousins of dark matter, that may exist 'beside' our own. Since they must rarely interact with ordinary matter, these particles are said to exist in a 'hidden sector', explaining why they've escaped detection for so long.
Particle physicists at CERN are hopeful that they might be able to detect these hidden-sector particles in the near future.
https://phys.org/news/2016-10-secret-long-lived-particles.html
Quote: "Hidden-sector particles are separated from ordinary matter by a quantum mechanical energy barrier—like two villages separated by a mountain range," says Henry Lubatti from the University of Washington. "They can be right next to each other, but without a huge boost in energy to get over the peak, they'll never be able to interact with each other."
It is hoped that high-energy collisions generated by the Large Hadron Collider could kick these hidden-sector particles over this energy barrier into our own world.
Truly 'smashing' physics! 🤓
The emoji was a face palm.
I’m thinking WIMPs, ephemeral fermions and other particle exotica that Sabine Hossenfelder regularly comments on.
I’m thinking WIMPs, ephemeral fermions and other particle exotica that Sabine Hossenfelder regularly comments on.
"One theory to rule them all, one theory to find them, one theory to bring them all, and in the stringiness bind them."
https://arstechnica.com/science/202...-the-rise-and-fall-of-a-theory-of-everything/
Five different versions of string theory were invented, which are now thought to underlie a single, unified string theory called M-theory.
However, string theorists are currently concentrating on an idea called AdS/CFT correspondence, which is a postulated relationship between quantum field theories and M-theory.
AdS/CFT, according to my link, transforms the impossible-to-solve string theory problem into a really-difficult-to-solve quantum problem! 👍
The anti–de Sitter/conformal field theory (AdS/CFT) correspondence is also known as 'holographic duality', a phrase I mentioned earlier in the thread.
The AdS part corresponds to quantum gravity as formulated by M-theory, while the CFT part corresponds to quantum field theories.
In simple terms, holographic duality connects the theory of gravity and the theory of particles. Apparently what happens mathematically in the theory of gravity happens in the theory of particles, and vice versa.
Beyond this brief summary I fear to venture as "Here be Dragons"! 😱
However, I can leave you with a teaser - holographic duality may let us see what's inside a black hole!
https://www.cnet.com/science/space/an-alternate-holographic-universe-may-lead-us-into-a-black-hole/
P.S. To understand the link, we must realise that in holographic duality the four dimensional universe (x, y, z & t) is reduced to three dimensions (x, y & t) as a mathematical simplification.
Then a three-dimensional universe can be mathematically linked to a two-dimensional 'web' of particles.
In essence, the fabric of spacetime is represented as a 3D hologram "projected" by a 2D web.
Learning all the time! 🤓
The AdS part corresponds to quantum gravity as formulated by M-theory, while the CFT part corresponds to quantum field theories.
In simple terms, holographic duality connects the theory of gravity and the theory of particles. Apparently what happens mathematically in the theory of gravity happens in the theory of particles, and vice versa.
Beyond this brief summary I fear to venture as "Here be Dragons"! 😱
However, I can leave you with a teaser - holographic duality may let us see what's inside a black hole!
https://www.cnet.com/science/space/an-alternate-holographic-universe-may-lead-us-into-a-black-hole/
P.S. To understand the link, we must realise that in holographic duality the four dimensional universe (x, y, z & t) is reduced to three dimensions (x, y & t) as a mathematical simplification.
Then a three-dimensional universe can be mathematically linked to a two-dimensional 'web' of particles.
In essence, the fabric of spacetime is represented as a 3D hologram "projected" by a 2D web.
Learning all the time! 🤓
TBH, I find young Robbie a depressive Poet.
Surely William Shakespeare was better?
Enough said. 🙂
Is it the 12th time you post that reflective sphere ;-D
Well, repetition is the mother of learning...
//
Well, repetition is the mother of learning...
//
Will didn't write that. He was a country yokel from Stratford. I think he was just a cover for one of the posh boys from London because theatre was considered a commoner’s pastime.
Our friends son did his PhD in ‘Quantum Holography’. He now works for a startup doing an app of some description.
This book may be pertinent. I read it a while back.
https://www.amazon.com/Black-Hole-War-Stephen-Mechanics/dp/0316016403
https://www.amazon.com/Black-Hole-War-Stephen-Mechanics/dp/0316016403
Shakespeare in space!
Loosely based on Shakespeare's play, The Tempest.
And featuring Prospero stand-in Professor Morbius.
Who can forget those immortal lines:
"We're down to .386 of light speed."
"It's warm in here skipper."
"Yeah."
😊
Loosely based on Shakespeare's play, The Tempest.
And featuring Prospero stand-in Professor Morbius.
Who can forget those immortal lines:
"We're down to .386 of light speed."
"It's warm in here skipper."
"Yeah."
😊
Perhaps the 24-Cell would be better?
I say this in a polite way:
https://en.wikipedia.org/wiki/24-cell
But then I grew up in a Liberal Democracy:
Maybe just me. 🙂
Only five? I recall talk of like, 9, 10, 12 dimensions, and especially with how many theoretical physicists/mathematicians (it was becoming hard to tell the difference) were working on it, I'd think the number of string theories were approaching infinite ...
Gratuitous XKCD - see you at the Purity Ball!
https://xkcd.com/435/
It is my hypothesis that the reason Higgs boson particles decay so quickly is because
they emit outward in an exactly straight line > thereby being in 'conflict' with "The Arc of Motion"
and so quickly become absorbed by 'The Laws of The Universe'. ( actually a Duoverse )
The number of string theories does not correspond with the number of dimensions.
I understand the five versions of string theory to be:
- Bosonic string theory
- Superstring theory (or supersymmetric string theory)
- M-theory
- Brane world scenarios
- F-theory
Seriously, why does a Higgs boson only ever remain being a Higgs for a tiny amount of time?
Why does it prefer to exist as a pair of W bosons, particles that are responsible for carrying the weak nuclear force?
A question for @Bonsai: Could the rapid decay be a natural consequence of entropy?
That is, given the opportunity to go from its ordered state to a less-ordered state the Higgs will waste no time in doing so.
I take that back. I'm just jealous actually because I always wanted to a genius but never made the grade 😀
re the Higgs boson Galu, I can't imagine why, but it is intriguing that at that sub-atomic level, entropy appears to be busy at work'.
The neutrino intrigues me because it doesn't interact with anything on its own e.g. it can pass right through a planet completely unscathed. So, one of the ways it comes into existence is through the decay of a Higgs boson, and after that, it seems it's largely on its own for eternity. Interestingly, when a high-mass star goes supernova and then collapses into a neutrino star, huge quantities of neutrinos are emitted, and they arrive a short time before the visible light becomes detectable because the core collapse precedes the explosion.
The neutrino intrigues me because it doesn't interact with anything on its own e.g. it can pass right through a planet completely unscathed. So, one of the ways it comes into existence is through the decay of a Higgs boson, and after that, it seems it's largely on its own for eternity. Interestingly, when a high-mass star goes supernova and then collapses into a neutrino star, huge quantities of neutrinos are emitted, and they arrive a short time before the visible light becomes detectable because the core collapse precedes the explosion.