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2011
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Then

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2013

Inflationary Steps in the Planck Data

Miranda, V, Hu, Wayne

Understand

We extend and improve the modeling and analysis of large-amplitude, sharp inflationary steps for second order corrections required by the precision of the Planck CMB power spectrum and for arbitrary Dirac-Born-Infeld sound speed.

With two parameters, the amplitude and frequency of the resulting oscillations, step models improve the fit by $\Delta \chi^2 = -11.4$.
Evidence for oscillations damping before the Planck beam scale is weak: damping only improves the fit to $\Delta \chi^2 = -14.0$ for one extra parameter, if step and cosmological parameters are jointly fit, in contrast to analyses which fix the latter.
Likewise, further including the sound speed as a parameter only marginally improves the fit to $\Delta \chi^2 = -15.2$ but has interesting implications for the lowest multipole temperature and polarization anisotropy.

Built on

F. James and M. Roos, Comput.Phys.Commun. 10
1975
Earlier work this paper cites.
D. M. Goldberg and D. N. Spergel, Phys.Rev. D59
1999
Earlier work this paper cites.
J. Garriga and V. F. Mukhanov, Phys.Lett. B458
1999
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.
W. Hu, Astrophys.J. 557
2001
Earlier work this paper cites.
E. D. Stewart, Phys.Rev. D65
2002
Earlier work this paper cites.
E. Silverstein and D. Tong, Phys.Rev. D70
2004
Earlier work this paper cites.
J. Choe, J.-O. Gong, and E. D. Stewart, JCAP 0407
2004
Earlier work this paper cites.
X. Chen, R. Easther, and E. A. Lim, JCAP 0706
2007
Earlier work this paper cites.
R. Bean, X. Chen, G. Hailu, S.-H. Tye, and J. Xu, JCAP 0803
Original
2008
Earlier work this paper cites.
M. J. Mortonson, C. Dvorkin, H. V. Peiris, and W. Hu, Phys. Rev. D79
Original
2009
Earlier work this paper cites.