Evolution from Spherically Symmetric Primordial Overdensities

Using the standard cosmological parameters for λ-CDM Cosmology and adiabatic model, we show three animations:
(a) Spatial Mass Profile and Velocity Evolution
(b) Spatial Mass Profile Evolution
(c) Baryon, CDM and Drift Velocity Fluctuation Power Spectrum Evolution
for each of the following perturbations:

1. Point-like Perturbation
2. 1 Mpc Radius Top-hat Perturbation
3. 10 Mpc Radius Top-hat Perturbation
4. 20 Mpc Radius Top-hat Perturbation
5. 60 Mpc Radius Top-hat Perturbation

We also show the Baryon, CDM and Drift Velocity Power Spectrum for PLANCK primordial power spectrum

Note: The mass profile scale is arbitrary, but are correctly scaled between the panels for synchronous gauge. The amplitude of all the initial perturbations have been normalized such that the density-rms is same as that for the PLANCK primordial power spectrum at the redshift of 50,000 . For details on the proportionality of amplitude of perturbation with the power spectrum, mass profile and velocity profile click here.

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1. Point-like Perturbation

(a) Spatial Mass Profile and Velocity Evolution


Video also available here. (mp4)

(b) Spatial Mass Profile Evolution


Video also available here. (mp4)

(c) Baryon, CDM and Drift Velocity Fluctuation Power Spectrum Evolution


Video also available here. (mp4)

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2. 1 Mpc Radius Top-hat Perturbation

(a) Spatial Mass Profile and Velocity Evolution


Video also available here. (mp4)

(b) Spatial Mass Profile Evolution


Video also available here. (mp4)

(c) Baryon, CDM and Drift Velocity Fluctuation Power Spectrum Evolution


Video also available here. (mp4)

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3. 10 Mpc Radius Top-hat Perturbation

(a) Spatial Mass Profile and Velocity Evolution


Video also available here. (mp4)

(b) Spatial Mass Profile Evolution


Video also available here. (mp4)

(c) Baryon, CDM and Drift Velocity Fluctuation Power Spectrum Evolution


Video also available here. (mp4)

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4. 20 Mpc Radius Top-hat Perturbation

(a) Spatial Mass Profile and Velocity Evolution


Video also available here. (mp4)

(b) Spatial Mass Profile Evolution


Video also available here. (mp4)

(c) Baryon, CDM and Drift Velocity Fluctuation Power Spectrum Evolution


Video also available here. (mp4)

Back To Top



5. 60 Mpc Radius Top-hat Perturbation

(a) Spatial Mass Profile and Velocity Evolution


Video also available here. (mp4)

(b) Spatial Mass Profile Evolution


Video also available here. (mp4)

(c) Baryon, CDM and Drift Velocity Fluctuation Power Spectrum Evolution


Video also available here. (mp4)

Back To Top



6. Velocity Power Spectrum for Planck primordial power spectrum


Video also available here. (mp4)