PPT Slide
Galaxy Formation And Evolution
Perturbations may be either adiabatic (no heat exchange) or isothermal (constant temperature)….
The isothermal equation of state is given by P ? ? for an ideal gas....
In early Universe, isothermal fluctuations correspond to perturbations only in matter density….
These fluctuations would not grow until after decoupling, and would be gravitationally unstable afterwards on scales larger than 106 MO .
Formation of Small Structures First