Non-linear fields in generalized cosmologies

Matteo Fasiello, Zvonimir Vlah

Research output: Contribution to journalArticlepeer-review

100 Downloads (Pure)


The perturbative approach to structure formation has recently received a lot of attention in the literature. In such setups the final predictions for observables like the power spectrum is often derived under additional approximations such as a simplified time dependence. Here we provide all-order perturbative integral solutions for density and velocity fields in generalized cosmologies, with a direct application to clustering quintessence. We go beyond the standard results based on extending the EdS-like approximations. As an illustrative example, we apply our findings to the calculation of the one-loop power spectrum of density and momentum fields. We find corrections close to 1% in the mildly nonlinear regime of ΛCDM cosmologies for the density power spectrum, while in the case of the density-momentum power spectrum effects can reach up to 1.5% for k∼0.2h/Mpc.
Original languageEnglish
Article number063516
JournalPhysical Review D
Publication statusPublished - 12 Sept 2016


  • astro-ph.CO


Dive into the research topics of 'Non-linear fields in generalized cosmologies'. Together they form a unique fingerprint.

Cite this