Planck 2015 results - XX. Constraints on inflation

Planck 2015 results

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Table 18

Results of inflationary model comparison using the cross-correlation between BICEP2/Keck Array and Planck.

Inflationary model	Δχ²		lnB_0X
	w_int = 0	w_int ≠ 0	w_int = 0	w_int ≠ 0

R + R²/ (6M²)	+ 2.1	+ 1.6	...	+ 0.3
n = 2 / 3	+ 3.4	+ 3.0	−1.9	−1.2
n = 1	+ 5.1	+ 5.1	−1.6	−1.8
n = 4 / 3	+ 7.1	+ 6.6	−2.1	−2.5
n = 2	+ 12.3	+ 11.8	−6.0	−5.6
n = 3	+ 29.7	+ 29.6	−16.0	−15.6
n = 4	+ 58.1	+ 58.0	−30.1	−29.9
Natural	+ 6.0	+ 5.2	−5.6	−5.0
Hilltop (p = 2)	+ 1.6	+ 1.2	−0.7	−0.4
Hilltop (p = 4)	+ 1.5	+ 1.0	−0.6	−0.9
Double well	+ 3.2	+ 3.1	−4.3	−4.2
Brane inflation (p = 2)	+ 2.3	+ 2.2	+ 0.2	0.0
Brane inflation (p = 4)	+ 2.2	+ 2.2	+ 0.1	−0.1
Exponential tails	+ 2.2	+ 1.4	−0.1	0.0
SB SUSY	+ 3.4	+ 1.6	−1.8	−1.5
Supersymmetric α-model	+ 1.6	+ 1.1	−1.1	+ 0.1
Superconformal (m = 1)	+ 1.8	+ 1.3	−1.9	−1.4
Superconformal (m ≠ 1)	+ 1.8	+ 0.9	−2.5	−2.2

Notes. This table is similar to Table 7, which did not use the BKP likelihood. Note, however, that the Δχ² are computed with respect to the best fit of baseline + tensors, unlike in Table 7.

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