Equation 21 · Part 11 · No Particle Without a Cosigner

Ending index or upper bound: infty

p_x(\Omega) = \frac{\mathcal F_x(\Omega)}{\displaystyle\int_0^\infty \mathcal F_x(\Omega')\, d\Omega'}, \qquad \Omega > 0,

\infty

What this part means

This label says where the repeated addition, multiplication, or accumulation stops. It sets the last term or end of the range.

Its job in the formula

infty occurs below the fraction bar. The quantity above the bar is divided by this expression; zero is excluded as a denominator.

Full expressionEnding index or upper bound: inftyArticle meaning

The passage around this formula

$\mathcal F_x(\Omega)$ , viewed as a function of $\Omega$ for fixed everything else, has a natural reading as a spectrum: it says how much excitation probability accumulates at each possible gap, for a whole notional bank of detectors sharing one trajectory, one switching profile, and one field state, differing only in $\Omega$ . Restricting to the excitation branch $\Omega$ >0 — “did this detector behave as though it absorbed a quantum” is the only branch this article treats as bearing on particle content, since the decay branch $\Omega$ <0 mixes genuine field structure with detector-specific spontaneous-emission physics that is present even in flat, empty spacetime with no field excitation at all —…

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Learn the underlying idea

Σ adds a collection of terms. Π multiplies them. The lower and upper labels tell you which terms belong to the collection.

Open the illustrated sums and products: repeat an operation over an index guide →

Sources cited in the article section

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

These citations provide research context; check each source for the exact claim it supports.