Probing the imprint of interacting dark energy on very large scales

Understand

The observed galaxy power spectrum acquires relativistic corrections from lightcone effects, and these corrections grow on very large scales.

• Future galaxy surveys in optical, infrared and radio bands will probe increasingly large wavelength modes and reach higher redshifts.
• In order to exploit the new data on large scales, an accurate analysis requires inclusion of the relativistic effects.
• This is especially the case for primordial non-Gaussianity and for extending tests of dark energy models to horizon scales.