Robustness of the Starobinsky inflationary model. (arXiv:2007.09211v1 [astro-ph.CO])
<a href="http://arxiv.org/find/astro-ph/1/au:+Costa_S/0/1/0/all/0/1">S. Santos da Costa</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Benetti_M/0/1/0/all/0/1">M. Benetti</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Alcaniz_J/0/1/0/all/0/1">J.S. Alcaniz</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Silva_R/0/1/0/all/0/1">R. Silva</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Neves_R/0/1/0/all/0/1">R.M.P. Neves</a>
The first inflationary model conceived was the one proposed by Starobinsky
which includes an additional term quadratic in the Ricci-scalar $R$ in the
Einstein-Hilbert action. The model is now considered a target for several
future cosmic microwave background experiments given its compatibility with
current observational data. In this paper, we analyze the robustness of the
Starobinsky inflation by inserting it into a generalized scenario characterized
by an additional parameter $beta$. In the Einstein frame, the generalized
model recovers the original model for $beta = 0$ whereas $forall beta neq
0$ represents an extended class of models that admits a wider range of
solutions. We investigate limits on $beta$ from current cosmic microwave
background and baryonic acoustic oscillation data and find that only a small
deviation from the original scenario is allowed, $beta=-0.08 pm 0.12$ ($68%$
C.L.), which is fully compatible with zero and confirms the robustness of the
Starobinsky inflationary model in light of current observations.
The first inflationary model conceived was the one proposed by Starobinsky
which includes an additional term quadratic in the Ricci-scalar $R$ in the
Einstein-Hilbert action. The model is now considered a target for several
future cosmic microwave background experiments given its compatibility with
current observational data. In this paper, we analyze the robustness of the
Starobinsky inflation by inserting it into a generalized scenario characterized
by an additional parameter $beta$. In the Einstein frame, the generalized
model recovers the original model for $beta = 0$ whereas $forall beta neq
0$ represents an extended class of models that admits a wider range of
solutions. We investigate limits on $beta$ from current cosmic microwave
background and baryonic acoustic oscillation data and find that only a small
deviation from the original scenario is allowed, $beta=-0.08 pm 0.12$ ($68%$
C.L.), which is fully compatible with zero and confirms the robustness of the
Starobinsky inflationary model in light of current observations.
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