10 citations · 20 across the 4 of their papers we have counts for
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3 papers · 1 filter
astro-ph.CO2026★ 4 cited
Realizing the phantom-divide crossing with vector and scalar fields
Shinji Tsujikawa
In generalized Proca theories, characterized by a vector field with broken gauge invariance, late-time cosmic acceleration can be realized with a dark energy equation of sta…
astro-ph.CO2025★ 2 cited
DESI constraints on two-field quintessence with exponential potentials
George Alestas, Marienza Caldarola, Indira Ocampo +2
We investigate a quintessence model involving two scalar fields with double-exponential potentials. This configuration allows the system as a whole to emulate the dynamics of a sin…
astro-ph.CO2025★ 10 cited
Crossing the phantom divide in scalar-tensor and vector-tensor theories
Shinji Tsujikawa
DESI observations of baryon acoustic oscillations (BAOs), combined with cosmic microwave background (CMB) and type-Ia supernova (SN Ia) data, suggest that the dark energy equation…