- #1
shounakbhatta
- 288
- 1
Hello,
I understand the classical Lagrangian which follows the Principle of Least Action(A)
A=∫L dt
But what is Lagrangian density? Is it a new concept?
A=∫Lagrangian density dx^4
Here 4 is the four vector? One time-like and 3 space-like co-ordinates?
QFT uses Lagrangian to field theory?
Thanks.
I understand the classical Lagrangian which follows the Principle of Least Action(A)
A=∫L dt
But what is Lagrangian density? Is it a new concept?
A=∫Lagrangian density dx^4
Here 4 is the four vector? One time-like and 3 space-like co-ordinates?
QFT uses Lagrangian to field theory?
Thanks.