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UV Freeze-in in Starobinsky Inflation
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abstract
In the Starobinsky model of inflation, the observed dark matter abundance can be produced from the direct decay of the inflaton field only in a very narrow spectrum of close-to-conformal scalar fields and spinors of mass $\sim 10^7$ GeV. This spectrum can be, however, significantly broadened in the presence of effective non-renormalizable interactions between the dark and the visible sectors. In particular, we show that UV freeze-in can efficiently generate the right dark matter abundance for a large range of masses spanning from the keV to the PeV scale and arbitrary spin, without significantly altering the heating dynamics. We also consider the contribution of effective interactions to the inflaton decay into dark matter.
Forward citations
Cited by 4 Pith papers
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Tunnelling out of Starobinsky inflation: Raising the spectral tilt
A first-order phase-transition exit from a displaced Starobinsky branch truncates ~12 e-folds, shifting the spectral tilt from n_s≈0.965 to ≈0.973 at r≈2×10⁻³.
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Dark Matter Ultraviolet Freeze-in in General Reheating Scenarios
The paper derives analytic dark matter freeze-in yields for arbitrary power-law reheating histories and maps the gravitational production parameter space.
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The Goldstone Awakens: Unimodular dark energy in scale-invariant $R^2$ gravity
In a scale-invariant R² + unimodular-gravity model, the Goldstone boson of scale symmetry becomes thawing dark energy, with its equation of state fixed by the same coupling that sets the inflationary spectral tilt.
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Starobinsky Inflation and the Latest CMB Data: A Subtle Tension?
When implemented directly in CLASS, Starobinsky inflation remains consistent with Planck+ACT+BAO data at the 2σ level, but the inferred e-fold range sits above the reheating-motivated window, and a fitted R³ correctio...
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