[ascl:2508.017]
SIGWAY: Compute second-order, scalar induced gravitational wave signals
El Gammal, Jonas;
Ghaleb, Aya;
Franciolini, Gabriele;
Papanikolaou, Theodoros;
Peloso, Marco;
Perna, Gabriele;
Pieroni, Mauro;
Ricciardone, Angelo;
Rosati, Robert;
Tasinato, Gianmassimo;
Braglia, Matteo;
Fumagalli, Jacopo;
Kume, Jun'ya;
Morgante, Enrico;
Nardini, Germano;
Racco, Davide;
Renaux-Petel, Sébastien;
Veermäe, Hardi;
Werth, Denis;
Zavala, Ivonne;
LISA Cosmology Working Group
The SIGWAY data analysis pipeline computes second-order, scalar induced gravitational wave signals emitted by curvature perturbations in the early universe. The package solves the Mukhanov-Sasaki equation for single field ultra-slow roll inflationary models and computes the primordial scalar power spectrum Pζ. SIGWAY also computes the second order gravitational wave power spectrum ΩGW from P ζ for reentry during radiation domination or a phase of early matter domination.