42 citations · 51 across the 2 of their papers we have counts for
7 papers
Multi-field inflation and preheating in asymmetric -attractors
Oksana Iarygina, Evangelos I. Sfakianakis, Dong-Gang Wang +1
We analyze and compare the multi-field dynamics during inflation and preheating in symmetric and asymmetric models of -attractors, characterized by a hyperbolic field-space mani…
On the inflationary massive field with a curved field manifold
Dong-Gang Wang
Massive fields during inflation provide an interesting opportunity to test new physics at very high energy scales. Meanwhile in fundamental realizations, the inflationary field spa…
When Primordial Black Holes from Sound Speed Resonance Meet a Stochastic Background of Gravitational Waves
Yi-Fu Cai, Chao Chen, Xi Tong +2
As potential candidates of dark matter, primordial black holes (PBHs) are within the core scopes of various astronomical observations. In light of the explosive development of grav…
Shift-Symmetric Orbital Inflation: single field or multi-field?
Ana Achúcarro, Edmund J. Copeland, Oksana Iarygina +3
We present a new class of two-field inflationary attractor models, known as `shift-symmetric orbital inflation', whose behaviour is strongly multi-field but whose predictions are r…
Universality and scaling in multi-field -attractor preheating
Oksana Iarygina, Evangelos I. Sfakianakis, Dong-Gang Wang +1
We explore preheating in multi-field models of inflation in which the field-space metric is a highly curved hyperbolic manifold. One broad family of such models is called -attra…
Primordial Black Holes from Sound Speed Resonance during Inflation
Yi-Fu Cai, Xi Tong, Dong-Gang Wang +1
We report on a novel phenomenon of the resonance effect of primordial density perturbations arisen from a sound speed parameter with an oscillatory behavior, which can generically…