The Power Spectrum in de Sitter Inflation, Revisited

Details The Power Spectrum in de Sitter Inflation, Revisited The Power Spectrum in de Sitter Inflation, Revisited

2008-05-30

arxiv.org/abs/0806.0034v1

Phys.Rev.Lett.101:171301,2008

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

4 pages

Scientific paper

10.1103/PhysRevLett.101.171301

We find that the amplitude of quantum fluctuations of the invariant de Sitter vacuum coincides exactly with that of the vacuum of a comoving observer for a massless scalar (inflaton) field. We propose redefining the actual physical power spectrum as the difference between the amplitudes of the above vacua. An inertial particle detector continues to observe the Gibbons-Hawking temperature. However, although the resulting power spectrum is still scale-free, its amplitude can be drastically reduced since now, instead of the Hubble's scale at the inflationary period, it is determined by the square of the mass of the inflaton fluctuation field.

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