Abstract
We explore the possibility that both the suppression of the ell = 2 multipole moment of the power spectrum of cosmic microwave background temperature fluctuations and the possible dip for ell = 10–30 can be explained as well as a possible new dip for ell approx 60 as the result of the resonant creation of sequential excitations of a fermionic (or bosonic) closed superstring that couples to the inflaton field. We consider a D,=,26 closed bosonic string with one toroidal compact dimension as an illustration of how string excitations might imprint themselves on the CMB. We analyze the existence of successive momentum states, winding states or oscillations on the string as the source of the three possible dips in the power spectrum. Although the evidence of these dips are of marginal statistical significance, this might constitute the first observational evidence of successive superstring excitations in Nature.
Highlights
It is generally accepted that the energy scale of superstrings is so high that it is impossible to ever observe a superstring in the laboratory
[15] cosmic microwave background (CMB) power spectrum at ≈ 2, 20 and ≈ 60 as possible evidence for successive excitations of a superstring resonantly coupled with the inflaton during inflation
In a simple χ 2 analysis the best fit to these features implies dips in the primordial power spectrum with an amplitude of A ≈ 1.7 ± 1.5 corresponding to ∼ 40 oscillations on the string
Summary
It is generally accepted that the energy scale of superstrings is so high that it is impossible to ever observe a superstring in the laboratory. We propose that both the suppression of the = 2 moment and the suppression of the power spectrum in the range = 10– 30 could be explained from the resonant coupling to successive excitations of a single closed fermionic or bosonic superstring Both the apparent amplitude and the location of these features arise naturally in this picture. We utilize a simple model that has some of the relevant coarse features of string theory
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