i am reading a book written by malcolm ludvigsen and i have difficulty in understanding the following:
he introduces the maxwell tensor via
m\ddot{x} = eF(v)
where v is the four-velocity and \ddot{x} the four-acceleration of a charged partice.
he then states that F(a,b) = aF(b) is "clearly"...
My level of preparation is something like a desaster i would say. I haven't heard any lectures on general relativity. I just read some chapters in Malcolm Ludvigsen's general relativity and Carroll's spacetime and geometry, mainly the introductory parts on geometry and einstein's equation. They...
I'm just reading the schroeder/peskin introduction to quantum field theory. On Page 21 there is the equation
\phi(x)=\int\frac{d^3 p}{(2\pi)^3}\frac{1}{ \sqrt{2\omega_{\vec{p}}} }
(a_{\vec{p}} e^{i \vec{p} \cdot \vec{x}}
+a^{+}_{\vec{p}} e^{-i \vec{p} \cdot \vec{x}}
)
and in the...
In this case the convention is to first apply C_2 and then \sigma^(1).
The book's name is "symmetry - an introduction to group theory" written by Roy McWeeny. Hier is an excerpt; the certain special thing which i asked for is marked in red...
Hello,
in my Book is a formula, namely
sigma^(1) C_2 = sigma^(12)
where sigma^(1) is a reflection about the x-z-plane, C_2 is a pi-rotation about the z-axis and sigma^(12) is a reflection about the midway plane between x-z- and y-z-plane. When i in my Imagination make the steps on the...