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Equation 73 · Part 2 · A Horizon Is a Toll Booth, Not a Loophole

Symbol r

Tloc(r)=TH/f(r)T_{\rm loc}(r)=T_H/\sqrt{f(r)}
rr

What this part means

the radius.

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.

Where the article explains it

A static observer at radius r sees this blueshifted by the same Tolman factor that governs any locally measured temperature in a static spacetime, Tloc(r)T_{\rm loc}(r)=THT_H/f(r)\sqrt{f(r)} [ 11 ] .

The passage around this formula

…cold is the second cost, and here the numbers run the other way. The Hawking temperature of Sagittarius A* at infinity is THT_H=ℏ\hbar c3c^3/(8π\pi GMkBk_B)≈\approx1.5×\times10^{-14}\,K\mathrm K [ 10 ] . A static observer at radius r sees this blueshifted by the same Tolman factor that governs any locally measured temperature in a static spacetime, Tloc(r)T_{\rm loc}(r)=THT_H/f(r)\sqrt{f(r)} [ 11 ] . Setting TlocT_{\rm loc} equal to a demanding but realistic dilution-refrigerator base temperature of 10\,mK\mathrm{mK} and solving for the…

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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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Sources cited in the surrounding passage

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