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Quintessential Scale Dependence from Separate Universe Simulations · Around

2016

Quintessential Scale Dependence from Separate Universe Simulations

Chiang, Chi-Ting, Li, Yin, Hu, Wayne et al.

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By absorbing fluctuations into a local background, separate universe simulations provide a powerful technique to characterize the response of small-scale observables to the long-wavelength density fluctuations, for example those of the power spectrum and halo mass function which lead to the squeezed-limit $n$-point function and halo bias, respectively.

Using quintessence dark energy as the paradigmatic example, we extend these simulation techniques to cases where non-gravitational forces in other sectors establish a Jeans scale across which the growth of density fluctuations becomes scale dependent.
By characterizing the separate universes with matching background expansion histories, we show that the power spectrum and mass function responses depend on whether the long-wavelength mode is above or below the Jeans scale.
Correspondingly, the squeezed bispectrum and halo bias also become scale dependent.

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