Shinji Tsujikawa

collaborators

2 papers

astro-ph.CO2026

Phantom-divide crossing and suppressed structure growth in kinetically braided dark energy with momentum exchange

Masroor C. Pookkillath, Shinji Tsujikawa

We construct a linearly stable scalar-field model that realizes both an upward crossing of the dark-energy equation of state, from $w_{DE} < - 1$ to $w_{DE} > - 1$ , and weakened…

astro-ph.CO2025

Effective field theory of coupled dark energy and dark matter

Katsuki Aoki, Jose Beltrán Jiménez, Masroor C. Pookkillath +1

We formulate an effective field theory (EFT) of coupled dark energy (DE) and dark matter (DM) interacting through energy and momentum transfers. In the DE sector, we exploit the EF…