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F. James and M. Roos, Comput.Phys.Commun. 10
1975
Earlier work this paper cites.
A. Lewis, A. Challinor, and A. Lasenby, Astrophys. J. 538
2000
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J. A. Adams, B. Cresswell, and R. Easther, Phys. Rev. D64
2001
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E. D. Stewart, Phys.Rev. D65
2002
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H. Peiris et al. (WMAP Collaboration), Astrophys.J.Suppl. 148
2003
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E. Silverstein and D. Tong, Phys.Rev. D70
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M. Alishahiha, E. Silverstein, and D. Tong, Phys.Rev. D70
2004
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R. Easther and H. Peiris, JCAP 0609
2006
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2014

Steps to Reconcile Inflationary Tensor and Scalar Spectra

Miranda, V, Hu, Wayne, Adshead, Peter

Understand

The recent BICEP2 B-mode polarization determination of an inflationary tensor-scalar ratio $r=0.2^{+0.07}_{-0.05}$ is in tension with simple scale-free models of inflation due to a lack of a corresponding low multipole excess in the temperature power spectrum which places a limit of $r_{0.002}<0.11$ (95% CL) on such models.

Single-field inflationary models that reconcile these two observations, even those where the tilt runs substantially, introduce a scale into the scalar power spectrum.
To cancel the tensor excess, and simultaneously explain the excess already present in $\Lambda$CDM, ideally the model should introduce this scale as a relatively sharp transition in the tensor-scalar ratio around the horizon at recombination.
We consider models which generate such a step in this quantity and find that they can improve the joint fit to the temperature and polarization data by up to $2\Delta \ln{\cal L} \approx -14$ without changing cosmological parameters.

Built on

F. James and M. Roos, Comput.Phys.Commun. 10
1975
Earlier work this paper cites.
A. Lewis, A. Challinor, and A. Lasenby, Astrophys. J. 538
2000
Earlier work this paper cites.
J. A. Adams, B. Cresswell, and R. Easther, Phys. Rev. D64
2001
Earlier work this paper cites.
E. D. Stewart, Phys.Rev. D65
2002
Earlier work this paper cites.
H. Peiris et al. (WMAP Collaboration), Astrophys.J.Suppl. 148
2003
Earlier work this paper cites.
E. Silverstein and D. Tong, Phys.Rev. D70
2004
Earlier work this paper cites.
M. Alishahiha, E. Silverstein, and D. Tong, Phys.Rev. D70
2004
Earlier work this paper cites.
R. Easther and H. Peiris, JCAP 0609
2006
Earlier work this paper cites.