The Power Spectrum in de Sitter Inflation, Revisited

Abstract

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.

4 pages

References in corpus (5)

• Amplitude of Perturbations from Inflation
• Short-distance contribution to the spectrum of Hawking radiation
• Two-point functions with an invariant Planck scale and thermal effects
• Black hole radiance, short distances, and TeV gravity
• Acceleration radiation and the Planck scale

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