#dark energy
33 papers · 1 filter
Inflation, Open Universes, and Dark Energy
Anton Chudaykin, Mikhail M. Ivanov, Renata Kallosh +3
The authors analyze how allowing a small negative spatial curvature and/or a time‑varying dark energy equation of state changes the inferred scalar spectral index nₛ from CMB and g…
Unified dark sector approaches to cosmological tensions
Sergio Sevillano Muñoz, Mark Trodden
The paper analytically studies simple models where a single scalar field varies the mass of dark matter, showing how such models can simultaneously address early- and late-time cos…
DESI DR2 Results IV: Alcock-Paczyński Measurements from the Lyman Alpha Forest and Cosmological Constraints
DESI Collaboration, A. G. Adame, J. Aguilar +164
The DESI DR2 analysis measures the Alcock‑Paczynski effect using the full shape of Lyman‑α forest auto‑ and cross‑correlations, achieving 1% precision at redshift 2.33 and providin…
Bouncing Cosmology and Cosmological Dynamics in Gravity
Bhagwat Gidhad, A. S. Agrawal, S. A. Kadam
The paper reconstructs a cosmological model within f(Q,T) gravity that produces a non‑singular bounce linking a contracting phase to an expanding universe and naturally leads to a…
Phantom-divide crossing and suppressed structure growth in kinetically braided dark energy with momentum exchange
Masroor C. Pookkillath, Shinji Tsujikawa
The paper presents a stable scalar‑field model that allows the dark‑energy equation of state to cross from phantom (w < ‑1) to non‑phantom values while reducing the growth of cold…
No way ou: Epoch of Reionization Observations Do not Support Large Values of the Optical Depth to Reionization
Paulo Montero-Camacho, Yi Mao
The authors combine CMB data (excluding large‑scale polarization), BAO measurements, and quasar‑based reionization observations to estimate the optical depth to reionization as τ≈0…