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Equation 41 · Part 5 · A Horizon Is a Toll Booth, Not a Loophole

Symbol c^2

f(r)=1−2GM/(rc2)f(r) = 1-2GM/(rc^2)
c2c^2

What this part means

The square of c: multiply c by itself.

Its job in the formula

c2c^2 is one of the signed contributions combined to compute the quantity on the left.

The passage around this formula

​ d t , with f(r) = 1-2GM/(rc2c^2) for Schwarzschild. A locally conserved (Killing) energy E∞E_\infty — the energy the same quantity would be assigned by a distant static observer — and the energy measured by the local static observer, ElocE_{\rm loc} , are related by the standard blueshift-on-the-way-down relation

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Learn the underlying idea

An exponent tells how a base is used in multiplication. In x³, x is the base and 3 is the exponent: x³ = x × x × x.

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