Abstract
We propose a double inflection point inflationary model in supergravity with a single chiral superfield. Such a model allows for the generation of primordial black holes(PBHs) at small scales, which can account for a significant fraction of dark matter. Moreover in vacuum it is possible to give a small and adjustable SUSY breaking with a tiny cosmological constant.
Highlights
The nature of dark matter remains an open question in modern cosmology
We can see that the potential have two nearly inflection points, one of the inflection points can make the prediction of scalar spectral index and tensor-to-scalar ratio consistent with the current cosmic microwave background (CMB) data, and the other one at small scales can generate a large peak in the power spectrum to arise primordial black holes (PBHs)
We propose a double inflection point inflationary model in supergravity with a single chiral superfield
Summary
The nature of dark matter remains an open question in modern cosmology. One of the simplest explanations is assuming primordial black holes (PBHs) are a significant component of dark matter. It is known that PBHs can arise from high peaks of the curvature power spectrum at small scales via gravitational collapse during the radiation era, which could constitute dark matter today Such a peak in the power spectrum can be generated in a single-field inflation with an inflection point [4] instead of using inflationary models with multiple fields [5,6,7,8,9]. The other inflection point can generate a large peak of the power spectrum at small scales to arise PBHs. After inflation, one can obtain small SUSY breaking and a tiny cosmological constant by introducing a nilpotent superfield S [30,34,35].
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