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Note that this is perturbative, only valid for|w ϕ+1| ≪1

Expressc 2 sϕ in terms ofw ϕ We use the series we already found: wϕ =−1 + 200c 1X−αc 2 1X2 +O(X 3),(A3) whereα= 20000 + 1 2, c2 sϕ = 1 +c 1X−c 2 1X2 +O(X 3) · 2003

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Relativistic effects in k-essence

astro-ph.CO · 2026-04-22 · unverdicted · novelty 4.0

Relativistic effects dominate large-scale galaxy power spectra and grow with redshift, but are largely insensitive to k-essence microphysics in Fourier space while the angular spectrum shows clearer model distinctions, especially for the tachyon.

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  • Relativistic effects in k-essence astro-ph.CO · 2026-04-22 · unverdicted · none · ref 6

    Relativistic effects dominate large-scale galaxy power spectra and grow with redshift, but are largely insensitive to k-essence microphysics in Fourier space while the angular spectrum shows clearer model distinctions, especially for the tachyon.