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On page 81, equation (4.6), the author use the Fermi derivative to write the Jacobi equation
\begin{equation} \tag{4.6}
\frac{{D^2}_\text{F}}{\partial s^2} {}_{\bot}Z^a = -{R^a}_{bcd}{}_{\bot}Z^cV^bV^d + {h^a}_b {\dot{V}^b}_{;c} {}_{\bot}Z^c + \dot{V}^a\dot{V}_b {}_{\bot}Z^b
\end{equation}
and al...
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Chester Cheetah is a fictional character and the official mascot for Cheetos brand snacks and Chester's Puffcorn. According to an article in The New York Times, DDB Needham Worldwide was responsible for the creation of Chester; however, an episode of Unwrapped claims that the mascot was created by Hawley Pratt, the same man behind the Pink Panther.
== History ==
=== 1980s–1990s ===
Cheetos' original mascot was the Cheetos Mouse, who debuted in 1971 and disappeared around 1979. In 1986, Chester Cheetah was created by Brad Morgan, who art directed the commercials and designed the characte...
In Griffith's book, Introduction to Quantum Mechanics, in the equation:
he leaves out the term:
This seems completely wrong to me. Why is he able to ignore the potential term? Is this proof even correct? I've tried including the term, and the result I get says that the wave function should...
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Let's say we take some topologically trivial CTC spacetime, like the Gödel metric:
$$ds^2 = -dt^2 - 2e^{\sqrt{2}\Omega y} dt dx - \frac{1}{2}e^{\sqrt{2}\Omega y} dx^2 + dy^2 + dz^2$$
And then I recast it as a spin-2 field over Minkowski space ($g_{ab} = \eta_{ab} + h_{ab}$):
$$ h = -\left( \...
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The energy momentum tensor is found by varying the metric and holding all other fields constant. Since clearly $$\frac{\partial F}{\partial g}=0\longleftrightarrow
\delta_gF=0$$
we end up with
$$\delta_g S=\frac{1}{2}\int\mathrm{d}v\,\left(F^2g_{\mu\nu}/4-F^\tau{}_\mu F_{\tau\nu}\right)\delta g^{...
