Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-07-28
Astronomy and Astrophysics
Astrophysics
20 pages, 3 figures, uses iopart.cls; v2: 21 pages, added references, to appear in JCAP
Scientific paper
10.1088/1475-7516/2008/09/015
We revisit the issue of ripples in the primordial power spectra caused by trans-Planckian physics, and the potential for their detection by future cosmological probes. We find that for reasonably large values of the first slow-roll parameter epsilon (> 0.001), a positive detection of trans-Planckian ripples can be made even if the amplitude is as low as 10^-4. Data from the Large Synoptic Survey Telescope (LSST) and the proposed future 21 cm survey with the Fast Fourier Transform Telescope (FFTT) will be particularly useful in this regard. If the scale of inflation is close to its present upper bound, a scale of new physics as high as 0.2 M_Planck could lead to observable signatures.
Hamann Jan
Hannestad Steen
Sloth Martin S.
Wong Yvonne Y. Y.
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