String Theory: Is an Atom Made of 1 or Millions of Quarks?

In summary, string theory is a theory that explains the behavior of particles as the behavior of one string. All of the particles of the standard model are explained as the behavior of one string, usually in a loop. There is a popular construction where quarks are open strings ending on two different stacks of branes. The topology of the stacks is supposed to build geometrically the gauge groups. It's cute.
  • #1
clm321
58
0
in string theory is it that each quark of an atom has one string or is it made up of millions?

i know this is a kinda silly question
 
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  • #2
clm321 said:
in string theory is it that each quark of an atom has one string or is it made up of millions?

i know this is a kinda silly question

All of the particles of The Standard Model are explained as the behaviour of one string, usually in a loop.
 
  • #3
There is a popular construction where quarks are open strings ending on two different stacks of branes. The topology of the stacks is supposed to build geometrically the gauge groups. It's cute.
http://arxiv.org/abs/hep-th/0502005v2
 
  • #4
That does not really answer the first question by the way...

Already in the standard model, there are two ways to think of the quarks. The fundamental quarks (with current, small, masses) are directly in correspondence with the strings in different models as above. But there are also the quarks we probe in experiment, let me say phenomenological, or dressed quarks. They have a running mass which depends on the scale. Those are made up of more quarks and gluons if you look at them closer, just as strings are made up of more strings if you look at them closer. From this point of view, the question is far from trivial. In order to make contact with experiments dealing with quarks, you can not stay at the tree level, you need at least one, maybe two loops. So you need renormalization in QFT.
 
  • #5
ok but in m theory there are not only looped strings but open strings right?
 
  • #6
clm321 said:
ok but in m theory there are not only looped strings but open strings right?

I believe so, but definitely not loose; that would be type I I think.
 
  • #7
In string theory, what is the key difference between bosons, fermions, and leptons?

Edit: let me rephrase. What is the difference in the strings that explains the observable differences?
 
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  • #8
In string theories, closed loops are gravitons which are free to go off in extra dimensions; open strings are bound on each end to a brane which we inhabit...

the detailed pattern of vibration executed by a string produces a specific mass, electric charge, spin and so forth. heavy particles vibrate faster, with more energy, than light ones.
spin 1 particles are messenger, spin 1/2 are matter particles.
 
  • #9
I believe so, but definitely not loose; that would be type I I think.

Am not sure what "loose" means, but closed loops, gravitons, are not affixed to branes.

I am not sure if all the constitutent string theories associated with M theory have branes...and if they do which types, p and/or d...I just did a quick Wikipedia check...it says there are different types of d branes in different string theories...
http://en.wikipedia.org/wiki/Branes

Methinks we have too many theories, not enough experimental evidence so far...
 
  • #10
Naty1 said:
Am not sure what "loose" means, but closed loops, gravitons, are not affixed to branes.

I am not sure if all the constitutent string theories associated with M theory have branes...and if they do which types, p and/or d...I just did a quick Wikipedia check...it says there are different types of d branes in different string theories...
http://en.wikipedia.org/wiki/Branes

Methinks we have too many theories, not enough experimental evidence so far...

You're correct; not all STs rely on brane cosmology, and 'loose' means that they're not bound in a loop, but are under tension bound to at least one brane (I have no idea how this works for a theoretical entity with no basis in reality other than clever math).

String Theory is fascinating, but it's an intellectual exercise and a dart thrown at a VERY large board. As for how many... There's... 5 sub-types of string theory including M-Theory... I think. Some are obsolete or have parts that are now part of other string theories.
 
  • #11
So is it safe to assume that ST will never be proved or disproved?
 
  • #12
Dav333 said:
So is it safe to assume that ST will never be proved or disproved?

I think if you could make money betting that, you might stand to become rich. That said, it's never really safe to assume that a theory can't be proven or falsified (unless it's insane to begin with, and that is merely confirmed), but I can't imagine how String/M theory could be examined.

We're already unlikely to be able to observe a lone quark (undressed), but I would imagine that happening before anything like confirmation of strings, or fuzzballs inside BH event horizons. The theory itself doesn't really allow for much by the way of confirmation it seems.

I'm no expert however, that's just my opinion.
 

1. What is string theory?

String theory is a theoretical framework that attempts to explain the fundamental nature of particles and their interactions by describing them as tiny, vibrating strings instead of point-like particles.

2. Is an atom made of 1 or millions of quarks?

According to string theory, an atom is made up of millions of quarks and other subatomic particles. However, these particles are not considered to be point-like, but rather tiny strings with different modes of vibrations.

3. How does string theory explain the properties of an atom?

String theory explains the properties of an atom by describing the different vibrations of the tiny strings that make up its subatomic particles. These vibrations determine the mass, charge, and other properties of the particles, which in turn determine the behavior of the atom as a whole.

4. Is string theory a proven concept?

No, string theory is still a theoretical concept and has not yet been proven through experiments. However, it is a popular area of research in theoretical physics and has shown promise in explaining fundamental particles and their interactions.

5. How does string theory relate to the concept of multiple dimensions?

String theory predicts that there are more than the four known dimensions (three spatial dimensions and one time dimension) in the universe. It suggests that there are 10 or 11 dimensions, with the extra dimensions being curled up and undetectable at our current level of technology. These extra dimensions are needed to make sense of the fundamental forces and particles described by string theory.

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