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Planck constraints on Brans-Dicke gravity with <strong>the</strong> potential<br />
Brans−Dicke <strong>the</strong>ories<br />
The observables are <br />
10 0 Starobinsky’s f(R) model <br />
10 −1<br />
BD<br />
=10 2<br />
BD<br />
=10 10<br />
where N is <strong>the</strong> number of <br />
e-‐foldings from <strong>the</strong> end of <br />
Inflation. <br />
r 0.05<br />
10 −2<br />
BD<br />
=1<br />
BD<br />
=0<br />
10 −3<br />
10 −4<br />
BD<br />
=−1.4<br />
0.945 0.95 0.955 0.96 0.965 0.97 0.975 0.98<br />
n s
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