Identifying the inflaton with primordial gravitational waves

Details Identifying the inflaton with primordial gravitational waves Identifying the inflaton with primordial gravitational waves

2010-09-20

arxiv.org/abs/1009.3741v4

Phys.Rev.Lett.106:191302,2011

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

5 pages, 2 figures, version to appear in PRL

Scientific paper

10.1103/PhysRevLett.106.191302

We explore the ability of experimental physics to uncover the underlying structure of the gravitational Lagrangian describing inflation. While the observable degeneracy of the inflationary parameter space is large, future measurements of observables beyond the adiabatic and tensor two-point functions, such as non-Gaussianity or isocurvature modes, might reduce this degeneracy. We show that even in the absence of such observables, the range of possible inflaton potentials can be reduced with a precision measurement of the tensor spectral index, as might be possible with a direct detection of primordial gravitational waves.

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