Large-scale structure power spectrum from scalar-tensor gravity

Understand

This work deals with the computation of the power spectrum of large-scale structure using the dynamical system approach for a multi-fluid universe in scalar-tensor theory of gravity.

• We use the $1+3$ covariant approach to obtain evolution equations and study the behavior of the matter power spectrum of perturbation equations.
• The study is based on the equivalence between $f(R)$ theory of gravity and scalar-tensor theory of gravity.
• We find that, for power-law $(R^{n})$ models, with $1<n<1.3$, we have the power spectrum evolving above general relativistic scale-invariant line.