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2014

Evidence for bouncing evolution before inflation after BICEP2

Xia, Jun-Qing, Cai, Yi-Fu, Li, Hong et al.

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The BICEP2 collaboration reports a detection of primordial cosmic microwave background (CMB) B-mode with a tensor-scalar ratio $r=0.20^{+0.07}_{-0.05}$ (68% C.L.).

However, this result is in tension with the recent Planck limit, $r<0.11$ (95% C.L.), on constraining inflation models.
In this Letter we consider an inflationary cosmology with a preceding nonsingular bounce which gives rise to observable signatures on primordial perturbations.
One interesting phenomenon is that both the primordial scalar and tensor modes can have a step feature on their power spectra, which nicely cancels the tensor excess power on the CMB temperature power spectrum.

Evidence for bouncing evolution before inflation after BICEP2 · Around

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