Equation 41 · Part 2 · A Horizon Is a Toll Booth, Not a Loophole
Symbol r
What this part means
r is an argument of the function-like quantity on the left; its role is set by that function’s stated inputs.
Its job in the formula
r is an argument of the function-like quantity on the left; its role is set by that function’s stated inputs.
Full expression→Symbol r→Article meaning
The passage around this formula
d t , with f(r) = 1-2GM/(r) for Schwarzschild. A locally conserved (Killing) energy — the energy the same quantity would be assigned by a distant static observer — and the energy measured by the local static observer, , are related by the standard blueshift-on-the-way-down relation
Learn the underlying idea
A variable is a named place for a value. Its letter is a local label: x can mean position in one formula and a data point in another.
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