Understand
Next generation surveys will observe the large-scale structure of the Universe with unprecedented accuracy.
- This will enable us to test the relationships between matter over-densities, the curvature perturbation and the Newtonian potential.
- Any large-distance modification of gravity or exotic nature of dark energy modifies these relationships as compared to those predicted in the standard smooth dark energy model based on General Relativity.
- In linear theory of structure growth such modifications are often parameterised by virtue of two functions of space and time that enter the relation of the curvature perturbation to, first, the matter over-density, and second, the Newtonian potential.
Reading the bibliography…