Non-canonical terms of scalar fields

TimeFall
Messages
12
Reaction score
0
Hello! Well, I guess it's all in the title, really. I was reading about k-essence, and it was described as a scalar field having a non-canonical kinetic term. I did a bit of browsing and couldn't find a clear explanation of what, exactly, a non-canonical kinetic term is. Any help would be greatly appreciated! Thanks!
 
Physics news on Phys.org
I just peeked at probably the same paper you're reading, and it says that non-canonical kinetic energy means that instead of using X = ½∂μφ ∂μφ for the kinetic energy, he uses some function of it, F(X).
 
  • Like
Likes 1 person

Thread 'Toponium Discovered'

Toponium is a hadron which is the bound state of a valance top quark and a valance antitop quark. Oversimplified presentations often state that top quarks don't form hadrons, because they decay to bottom quarks extremely rapidly after they are created, leaving no time to form a hadron. And, the vast majority of the time, this is true. But, the lifetime of a top quark is only an average lifetime. Sometimes it decays faster and sometimes it decays slower. In the highly improbable case that...
View full post »

Thread 'Dirac-Delta from Normalization of Continuous Eigenfunctions'

I'm following this paper by Kitaev on SL(2,R) representations and I'm having a problem in the normalization of the continuous eigenfunctions (eqs. (67)-(70)), which satisfy \langle f_s | f_{s'} \rangle = \int_{0}^{1} \frac{2}{(1-u)^2} f_s(u)^* f_{s'}(u) \, du. \tag{67} The singular contribution of the integral arises at the endpoint u=1 of the integral, and in the limit u \to 1, the function f_s(u) takes on the form f_s(u) \approx a_s (1-u)^{1/2 + i s} + a_s^* (1-u)^{1/2 - i s}. \tag{70}...
View full post »

Similar threads

I Commutation relations for an interacting scalar field
Replies
3
Views
2K
I What Does the Shape of the Higgs Potential Tell Us?
Replies
4
Views
3K
I Field theories in 4 dimensions
Replies
7
Views
3K
A Non-Dynamical Fields: Definition & Interpretations
Replies
1
Views
2K
A Local phase invariance of complex scalar field in curved spacetime
Replies
2
Views
1K
What is the significance of the kinetic term in a scalar field theory?
Replies
4
Views
5K
A (apparently?) non-local quantum field theory
Replies
1
Views
2K
I Classical Field Theory - Something isn't clicking
Replies
12
Views
1K
Gauge theory with non-dynamical gauge field
Replies
2
Views
2K
The SUSY F and D terms, and the scalar potential
Replies
1
Views
5K

Hot Threads

Recent Insights

Back
Top