Abstract
We have studied the influence of equation of state w, and effective sound speed ce of the dark energy perturbations on the cold dark matter (CDM) power spectrum. We have considered different cases of the equation of state and the effective sound speed, and the CDM power spectrum is found to be generically suppressed in these cases as compared to the ΛCDM model. The suppression at different length scales depends on the value of ω and ce, and the effect of different ω is profoundly seen at all length scales. The influence of sound speed is significantly seen only at the intermediate length scales, and is negligible at scales very much larger and smaller than the Hubble scale.
Highlights
Recent Type Ia supernova observations have confirmed that the universe is expanding at an accelerated rate at the present epoch [1]
−L(X,φ) effective speed of sound of. From these definitions of equation of state (EOS) and ESS, it is obvious that there evolution is governed by the Lagrangian density of the scalar field dark energy
Where Ωm and Ωd are the dimensionless density parameter. It is evident from the equation (5) that the matter power spectrum is dependent on the effective sound speed and equation of state
Summary
Recent Type Ia supernova observations have confirmed that the universe is expanding at an accelerated rate at the present epoch [1]. We will use this fact and choose a parameterized form of w and c2e to study the influence of perturbations in DE on CDM power spectrum.
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