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Field derivative couplings to the Einstein tensor
0.25
0.2
Field−derivative coupling models
(b)
(a) n=2
(b) n=4
This coupling leads to the slow-­‐down
of the velocity of inflaton, which
leads to the decrease of r.
For smaller M, the scalar spectral
index gets larger.
r 0.05
0.15
0.1
smaller M
(a)
Both the quadratic and quartic potentials
are outside the 68 % CLboundary.
0.05
A similar conclusion was reached for
the Galileon couplings.
0
0.945 0.95 0.955 0.96 0.965 0.97 0.975 0.98
n s