Interacting Quintessence and Growth of Structure
  In standard cosmologies, dark energy interacts only gravitationally with dark
matter. An extension to this picture is interacting quintessence (IQ) model,
where scalar field coupled directly to cold dark matter. The percentage
deviation is studied in IQ model wrt $\Lambda$CDM for varied values of
interacting parameter W. We investigated the effect of interaction on matter,
Kaiser and galaxy power spectrums. Deviation in power spectrum increases with
interaction on both large and small scales. On small scale, variation is
comparatively smaller than on large scale. On large scale, it is due to dark
energy perturbation while it is background evolution that causes a difference
on small scale. These variations decrease with increase in redshift. Herein
thawing class of model with linear potential is studied.
