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Occurrence of Tachyonic Preheating in the Mixed Higgs- Model
Minxi He, Ryusuke Jinno, Kohei Kamada +2
It has recently been suggested that at the post-inflationary stage of the mixed Higgs- model of inflation efficient particle production can arise from the tachyonic instabilit…
Analytic infinite derivative gravity, -like inflation, quantum gravity and CMB
Alexey S. Koshelev, K. Sravan Kumar, Alexei A. Starobinsky
Emergence of inflation which is the best fit framework for CMB observations till date comes from the attempts to attack the problem of quantization of gravity which in turn h…
Generating PBHs and small-scale GWs in two-field models of inflation
Matteo Braglia, Dhiraj Kumar Hazra, Fabio Finelli +3
Primordial black holes (PBHs) generated by gravitational collapse of large primordial overdensities can be a fraction of the observed dark matter. In this paper, we introduce a mec…
Scalar-tensor theories of gravity, neutrino physics, and the tension
Mario Ballardini, Matteo Braglia, Fabio Finelli +3
We use 2018 data to constrain the simplest models of scalar-tensor theories characterized by a coupling to the Ricci scalar of the type with $F(σ) = N_{pl}^2 + ξσ…
Anisotropic instability in a higher order gravity theory
Masroor C. Pookkillath, Antonio De Felice, Alexei A. Starobinsky
We study a metric cubic gravity theory considering odd-parity modes of linear inhomogeneous perturbations on a spatially homogeneous Bianchi type I manifold close to the isotropic…
Constraints on features in the inflationary potential from future Euclid data
Ivan Debono, Dhiraj Kumar Hazra, Arman Shafieloo +2
With Planck cosmic microwave background observations, we established the spectral amplitude and tilt of the primordial power spectrum. Evidence of a red spectral tilt ($n_\mathrm{s…