Could supersymmetry explain everything?
-
0:06 - 0:07You've probably heard of electrons and protons,
-
0:07 - 0:10the building block particles that make up atoms.
-
0:10 - 0:12But there are all kinds of other particles in the universe,
-
0:12 - 0:15and we have a pretty good idea of what they are and how they interact.
-
0:15 - 0:19But even our best theories struggle when it comes to big nasty questions.
-
0:19 - 0:20Like, where does mass come from?
-
0:20 - 0:22And what is dark matter made of?
-
0:22 - 0:25There may be a theory that can answer these questions at a stroke.
-
0:25 - 0:29It's elegant, mathematically speaking, but is it true?
-
0:29 - 0:31It's called "Super Symmetry".
-
0:35 - 0:39If you wanted to explain why all stuff in the universe behaves the way it does,
-
0:39 - 0:42you could do a lot worse than the so-called "Standard Model".
-
0:42 - 0:44Developed in the 1960's and 70's,
-
0:44 - 0:47it categorises all fundemental particles as either "leptons", like electrons,
-
0:47 - 0:51"quarks", the building blocks of protons and neutrons,
-
0:51 - 0:56or "force carriers", like photons, which transmit electric and magnetic force.
-
0:56 - 0:58The Standard Model is a triumph of modern physics,
-
0:58 - 1:02every particle the theory predicts has been observed in experiments,
-
1:02 - 1:03except for one.
-
1:03 - 1:07The Higgs boson, a force carrrier thought to give other particles the property of mass,
-
1:07 - 1:10has so far eluded direct detection.
-
1:10 - 1:13And what's worse, experiments suggest that if the Higgs boson exists,
-
1:13 - 1:17it would likely be way lighter than the simple Standard Model predicts.
-
1:18 - 1:19But all is not lost.
-
1:19 - 1:22Physicists can get around this problem with a little mathematical tweaking.
-
1:22 - 1:26Think of the Standard Model as an old school hi-fi stereo system,
-
1:26 - 1:29and the variables in the theory are like the knobs on the amplifier.
-
1:29 - 1:33To get the sound you want you can twiddle the various bass, mid and high levels,
-
1:33 - 1:37tweaking by tiny amounts until it sounds just right.
-
1:37 - 1:40That's fine for listening to [Led] Zeppelin records, but instead of just 3 knobs
-
1:40 - 1:42the Standard Model has almost 20.
-
1:42 - 1:44How would you know how to set them all?
-
1:44 - 1:48With no real physical reason for turning one know one way, and another the other way,
-
1:48 - 1:52it's all very arbitrary, and not how we'd like to think the universe actually works.
-
1:52 - 1:55It would be nice if there were a more elegant solution.
-
1:55 - 2:00As it turns out the theory of Super Symmetry allows the mass of the Higgs boson
-
2:00 - 2:02to be in the right range without fine tuning the math.
-
2:02 - 2:06It does so by introducing a whole new cast of particles to pair up with the ones
-
2:06 - 2:07we already know about.
-
2:07 - 2:12These super partners are like bizarre world versions of the Standard Model particles only more massive.
-
2:12 - 2:16And not only do they interact to solve the Higgs mass problem,
-
2:16 - 2:18they also provide a plausible explanation for dark matter.
-
2:18 - 2:21The mysterious mass that makes up the bulk of the universe.
-
2:21 - 2:25The problem is none of these super particles have been detected yet.
-
2:25 - 2:29Even by the Large Hadron Collider, which many thought would have found them by now.
-
2:29 - 2:32This doesn't mean Super Symmetry isn't true, but it leaves the door open
-
2:32 - 2:35for all kinds of other theories, from messier versions of the Standard Model
-
2:35 - 2:37to more exotic theories envoking extra dimensions.
-
2:38 - 2:42So far, with no Higgs boson and no super partners, the chance of having
-
2:42 - 2:45a simple theory to explain everything seems to be getting smaller.
-
2:45 - 2:47But that may be ok.
-
2:47 - 2:51After all, there's nothing that says the physical world has to follow elegant mathematical rules.
-
2:51 - 2:55As much as we might hate to admit it, it could be that even at its most fundamental levels,
-
2:55 - 2:57reality is just messy.
- Title:
- Could supersymmetry explain everything?
- Description:
-
Supersymmetry could elegantly explain some of the greatest mysteries of the universe, such as how elementary particles got their mass. The theory endows the elusive Higgs boson, believed to be responsible for giving other known particles their mass, with just the right amount of mass of its own to solve problems introduced by the standard model of particle physics.
But there's no guarantee that supersymmetry is true. The theory introduces a whole new cast of particles that have yet to be observed.
Watch this animation to find out more...
- Video Language:
- English
- Team:
- Music Captioning
- Project:
- Other Music Videos
Berley edited English, British subtitles for Could supersymmetry explain everything? | ||
Berley edited English, British subtitles for Could supersymmetry explain everything? | ||
Berley edited English, British subtitles for Could supersymmetry explain everything? | ||
Berley edited English, British subtitles for Could supersymmetry explain everything? | ||
Berley added a translation |