44 citations · 153 across the 13 of their papers we have counts for
13 papers
Primordial turbulence from inflation: a new inflaton-driven turbulent regime
Oksana Iarygina, Axel Brandenburg
For the first time, we establish a direct connection between inflationary dynamics and the subsequent magnetohydrodynamic evolution. Starting from vacuum fluctuations, we self-cons…
Isochrones in primordial magnetic field evolution
Axel Brandenburg, Mattia Cielo, Oksana Iarygina +1
In the early universe, a primordial magnetic field undergoes a turbulent decay while its length scale increases due to an inverse cascade. The size of the largest processed eddy sc…
Ultra slow-turn inflation
Ana Achúcarro, Perseas Christodoulidis, Jinn-Ouk Gong +1
In standard multi-field models, tachyonic isocurvature perturbations generally indicate the presence of an instability. We revisit the stability of some known counterexamples and s…
Schwinger effect in axion inflation on a lattice
Oksana Iarygina, Evangelos I. Sfakianakis, Axel Brandenburg
We present the first lattice simulations of the nonlinear evolution after axion inflation by self-consistently incorporating currents arising from Schwinger pair production. The ta…
Axion Relic Pockets -- a theory of dark matter
Pierluca Carenza, Joshua Eby, Oksana Iarygina +1
We propose a new theory of dark matter based on axion physics and cosmological phase transitions. We show that theories in which a gauge coupling increases through a first-order ph…
Magnetogenesis from axion-SU(2) inflation
Axel Brandenburg, Oksana Iarygina, Evangelos I. Sfakianakis +1
We describe a novel proposal for inflationary magnetogenesis by identifying the non-Abelian sector of Spectator Chromo Natural Inflation (SCNI) with the sector…
Generalised conditions for rapid-turn inflation
Raul Wolters, Oksana Iarygina, Ana Achucarro
Rapid-turn slow-roll inflationary trajectories have been shown to be an attractor in two-field models, provided the turn rate is near constant and larger than the slow-roll paramet…
Backreaction of axion-SU(2) dynamics during inflation
Oksana Iarygina, Evangelos I. Sfakianakis, Ramkishor Sharma +1
We consider the effects of backreaction on axion-SU(2) dynamics during inflation. We use the linear evolution equations for the gauge field modes and compute their backreaction on…
Non-Gaussianity in rapid-turn multi-field inflation
Oksana Iarygina, M. C. David Marsh, Gustavo Salinas
We show that theories of inflation with multiple, rapidly turning fields can generate large amounts of non-Gaussianity. We consider a general theory with two fields, an arbitrary f…
Gravitational waves from spectator Gauge-flation
Oksana Iarygina, Evangelos I. Sfakianakis
We investigate the viability of inflation with a spectator sector comprised of non-Abelian gauge fields coupled through a higher order operator. We dub this model "spectator Gauge-…
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…
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…