I am just using my friend's account to ask a question and I have a MSc degree in physics its a four year course, three for undergraduate course and one for Masters course.
I am a physics graduate and I have just spent two years researching about problems like dark energy and dark matter and didn't get anywhere, did not even manage to write a single research paper. I like writing and publishing research papers as many as I can because they give me the feeling of a...
so are you saying that
$$
-g_{,\rho }^{\mu \rho }+g_{,\rho }^{\rho \nu }=0
$$
should be something like
$$
-g_{,\sigma }^{\mu \sigma }+g_{,\rho }^{\rho \nu }=0
$$
If so does this mean that its equivalent to
$$
g_{,\nu }^{[\mu \nu ]}=0
$$
Well, when contracting with respect to μ and ρ I get:
$$
-\frac{1}{2} g^{\rho \nu } {\Gamma} _{a\rho}^{a}-\frac{1}{2} g^{\rho
\nu} \Gamma _{\rho a}^{a}+g^{a\nu} \Gamma _{a\rho}^{\rho}+g^{\rho a} \Gamma _{\rho a}^{\nu}+g_{,\rho}^{\rho\nu}=0
$$
and when contracting with respect to nu and ρ I...
Hello,
I was reading a book about general relativity and I came across these two equations
$$ \begin{align}
\mathrm{g}^{\mu\nu}_{,\rho}+
\mathrm{g}^{\sigma\nu}{\Gamma}^{\mu}_{\sigma\rho}+
\mathrm{g}^{\mu\sigma}{\Gamma}^{\nu}_{\rho\sigma}
-\frac{1}{2}(...
Hi,
In Sidney Coleman's Lectures he talked about space translations such that
but when I expanded the exponentials and and used the commutation relation of p and x, I got ρ(x+a) instead of ρ(x-a)
Does anyone see where I may of went wrong?
Hello
I have a problem with this exam question does anyone now the solution.
Homework Statement
A roller coaster car has a mass of 800 kg.
The gravitational field strength is 10 N/kg.
It takes 20 s for the car to reach K from the start.
What is the average power required to raise...