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Main Authors: Qin, Fuxing, Wang, Yuting, Zhao, Gong-Bo, Cuesta, Antonio J., Alcaniz, Jailson, Rodrigues, Gabriel, Resco, Miguel Aparicio, Maroto, Antonio Lopez, Masip, Manuel, Rodrigues, Jamerson G., Santos, Felipe B. M. dos, Perez, Javier de Cruz, Garcia-Farieta, Jorge Enrique, Abramo, Raul, Benitez, Narciso, Bonoli, Silvia, Carneiro, Saulo, Cenarro, Javier, Cristobal-Hornillos, David, Dupke, Renato, Ederoclite, Alessandro, Hernan-Caballero, Antonio, Hernandez-Monteagudo, Carlos, Lopez-Sanjuan, Carlos, Marin-Franch, Antonio, de Oliveira, Claudia Mendes, Moles, Mariano, Sodre Jr., Laerte, Taylor, Keith, Varela, Jesus, Ramio, Hector Vazquez
Format: Preprint
Published: 2025
Subjects:
Cosmology and Nongalactic Astrophysics
Online Access:https://arxiv.org/abs/2505.04275
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Table of Contents:
  • Fisher-matrix forecasts are presented for the cosmological surveys of the Javalambre Physics of the Accelerating Universe Astrophysical Survey (J-PAS) and the Subaru Prime Focus Spectrograph (PFS). The wide, low-redshift coverage of J-PAS and the high-density, high-redshift mapping of PFS are strongly complementary: combining the two reduces marginalized uncertainties on all primary parameters compared with either survey individually. Adding the joint J-PAS+PFS data to next-generation CMB measurements from the Simons Observatory (SO) and \textsc{LiteBird} yields an expected precision of $σ(\sum m_ν)=0.017\,$eV in the $Λ$CDM$+\sum m_ν+N_{\rm eff}$ framework, sufficient to disfavour the inverted neutrino hierarchy at $2.34\,σ$ if the true mass sum equals the normal-ordering minimum. Motivated by recent DESI results, we also forecast within a $w_0w_a$CDM$+\sum m_ν+N_{\rm eff}$ cosmology, adopting the DESI\,DR2 best-fit values ($w_0=-0.758$, $w_a=-0.82$) as fiducial. The combination CMB+J-PAS+PFS then delivers $σ(w_0)=0.044$ and $σ(w_a)=0.18$, corresponding to a $5.1\,σ$ preference for a time-varying dark-energy equation of state. These findings show that J-PAS and PFS, especially when coupled with Stage-IV CMB observations, will provide competitive tests of neutrino physics and the dynamics of cosmic acceleration.

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