8 papers
Ab Initio Cosmological Simulations: From Inflation to Present-Day Structure Formation
Drew Jamieson, Angelo Caravano, Eiichiro Komatsu
The cosmic web preserves a record of the physics that shaped the universe in its earliest moments, the period of exponential expansion known as cosmic inflation. However, if inflat…
Lattice simulations of scalar-induced gravitational waves from inflation
Angelo Caravano, Gabriele Franciolini, Sébastien Renaux-Petel
Scalar-induced gravitational waves (SIGWs) provide a powerful probe of inflationary dynamics on scales far smaller than those accessible to the cosmic microwave background and larg…
InflationEasy: A C++ Lattice Code for Inflation
Angelo Caravano
InflationEasy is a lattice code specifically developed for cosmological inflation. It simulates the nonlinear dynamics of a scalar field on a three-dimensional lattice in an expand…
Primordial Power Spectrum and Bispectrum from Lattice Simulations of Axion-U(1) Inflation
Drew Jamieson, Angelo Caravano, Eiichiro Komatsu
We present primordial non-Gaussianity predictions from a new high-precision code for simulating axion-U(1) inflation on a discrete lattice. We measure the primordial scalar curvatu…
Ultra-Slow-Roll Inflation on the Lattice II: Nonperturbative Curvature Perturbation
Angelo Caravano, Gabriele Franciolini, Sébastien Renaux-Petel
Building on the recent lattice simulations of ultra-slow-roll (USR) dynamics presented in arXiv:2410.23942, we investigate the role of the nonlinear relation between the inflaton f…
Ultra-Slow-Roll Inflation on the Lattice I: Backreaction and Nonlinear Effects
Angelo Caravano, Gabriele Franciolini, Sébastien Renaux-Petel
Violating the slow-roll regime during the final stages of inflation can significantly enhance curvature perturbations, a scenario often invoked in models producing primordial black…