Primordial Gravitational Waves with LISA

TL;DR

This paper discusses how the LISA mission can detect primordial gravitational waves, offering insights into the early Universe and inflationary physics beyond standard models, especially on smaller scales than CMB observations.

Contribution

It highlights the potential of LISA to complement CMB experiments in probing complex inflationary scenarios through gravitational wave detection.

Findings

LISA can detect primordial GWs from non-standard inflationary models.

Gravitational wave signals can reveal physics of the early Universe.

LISA's observations will improve understanding of inflationary phases.

Abstract

Primordial Gravitational Waves are the next target of modern cosmology. They represent a window on the early Universe and the only probe of the physics and microphysics of the inflationary period. When the production of GWs happens in scenarios richer than the standard single-field slow-roll, the GW signal becomes potentially detectable also on scales smaller than the Cosmic Microwave Background. LISA will be extremely complementary to CMB experiments to extract information about primordial inflationary models and in particular to probe phases of the inflationary period for which we have very poor knowledges.