The dimensions of elementary particles in quantum physics and string theory

  • Thread starter T=0
  • Start date
  • #1
T=0
10
0
I noticed that in quantum physics, an elementary particle has no dimensions, and is point like, but in string theory has one dimension. Why is this?
 

Answers and Replies

  • #2
mathman
Science Advisor
8,048
535
I noticed that in quantum physics, an elementary particle has no dimensions, and is point like, but in string theory has one dimension. Why is this?

This may sound silly, but basically it is because the theories are different. String theory is looking at things on a much smaller length scale than quantum theory.
 
  • #3
51
0
Probably you mean "mass dimension"? In supersymmetric theories, the anticommutator of two susy generators Q is equal to the momentum P, which has mass dimension 1. From here, dimension of Q follows: it is 1/2. Similarly, by imposing that the action has 0 dim, you can find that a scalar field has dimension 1, a spinorial field 3/2, etc.
 
  • #4
T=0
10
0
Thnx guys, great help.
 

Related Threads on The dimensions of elementary particles in quantum physics and string theory

Replies
2
Views
1K
  • Last Post
Replies
2
Views
687
  • Last Post
Replies
20
Views
2K
  • Last Post
Replies
1
Views
528
  • Last Post
Replies
3
Views
2K
  • Last Post
Replies
3
Views
4K
  • Last Post
Replies
1
Views
2K
  • Last Post
Replies
14
Views
4K
  • Last Post
Replies
1
Views
1K
Top