Clustering of quintessence on horizon scales and its imprint on HI intensity mapping

Understand

Quintessence can cluster only on horizon scales.

• What is the effect on the observed matter distribution? To answer this, we need a relativistic approach that goes beyond the standard Newtonian calculation and deals properly with large scales.
• Such an approach has recently been developed for the case when dark energy is vacuum energy, which does not cluster at all.
• We extend this relativistic analysis to deal with dynamical dark energy.