Equation 35 · Part 1 · No Particle Without a Cosigner

Symbol chi

\chi

\chi

What this part means

all defined intrinsically along each worldline.

Its job in the formula

chi is a part of this expression. Its role is fixed by the surrounding article and by the operations shown in the formula.

Full expressionSymbol chiArticle meaning

Where the article explains it

$D_{\rm det}$ also does not change under a Poincaré transformation applied identically to both worldlines and to the field vacuum together, since W is Poincaré invariant and $\tau$ , $\Omega$ , and $\chi$ are all defined intrinsically along each worldline.

The passage around this formula

…no freedom here to exploit. $D_{\rm det}$ also does not change under a Poincaré transformation applied identically to both worldlines and to the field vacuum together, since W is Poincaré invariant and $\tau$ , $\Omega$ , and $\chi$ are all defined intrinsically along each worldline. What does change $D_{\rm det}$ , and is meant to, is any actual physical difference between the two setups. The discipline this article insists on is separating that meant-to variation from an unmeant one: before attributing a nonzero D_{ $\rm$ …

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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 article section

[9] Asymptotic States of Accelerated Detectors and Universality of the Unruh Effect ↗

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