4 papers
Geometry of non-Gaussianity in transient non-attractor inflation
Mohammad Hossein Namjoo, Bahar Nikbakht
Inflationary models predicting abundant primordial black holes (PBHs) and large amplitude of scalar-induced gravitational waves (SIGWs) often rely on amplified fluctuations over li…
Hamiltonians to all Orders in Perturbation Theory and Higher Loop Corrections in Single Field Inflation with PBHs Formation
Hassan Firouzjahi, Bahar Nikbakht
We calculate the action and the interaction Hamiltonians to all orders in perturbation theory in the model of single field inflation with a transient ultra slow-roll phase. Employi…
Non-Perturbative Hamiltonian and Higher Loop Corrections in USR Inflation
Hassan Firouzjahi, Bahar Nikbakht
Calculating the action and the interaction Hamiltonian at higher orders in cosmological perturbation theory is a cumbersome task. We employ the formalism of EFT of inflation in the…
Non-Gaussianity consistency relations and their consequences for the peaks
Mohammad Hossein Namjoo, Bahar Nikbakht
Strong deviations from scale invariance and the appearance of high peaks in the primordial power spectrum have been extensively studied for generating primordial black holes (PBHs)…