The tensor bi-spectrum in a matter bounce

Understand

Matter bounces are bouncing scenarios wherein the universe contracts as in a matter dominated phase at early times.

• Such scenarios are known to lead to a scale invariant spectrum of tensor perturbations just as de Sitter inflation does.
• In this work, we examine if the tensor bi-spectrum can discriminate between the inflationary and the bouncing scenarios.
• Using the Maldacena formalism, we analytically evaluate the tensor bi-spectrum in a matter bounce for an arbitrary triangular configuration of the wavevectors.