Probing The Early Universe Cosmology With NANOGrav: Possibilities and Limitations

Understand

A stochastic gravitational wave background is a prediction of a number of astrophysical and cosmological phenomena including early Universe Cosmology.

• Recently, the NANOGrav Collaboration reported conclusive evidence for a stochastic gravitational-wave background.
• We analyze the NANOGrav signal assuming it is of primordial origin including the reheating phase.
• We use the latest measurements from NANOGrav to constrain the Universe's reheating equation of state $w_{re}$ the reheating temperature, $T_{re}$, the tensor to scalar ratio $r$, and the tensor tilt $n_t$.