TY - JOUR
T1 - Cosmology in the era of Euclid and the Square Kilometre Array
AU - Sprenger, Tim
AU - Archidiacono, Maria
AU - Brinckmann, Thejs
AU - Clesse, Sébastien
AU - Lesgourgues, Julien
PY - 2019/2/22
Y1 - 2019/2/22
N2 - Theoretical uncertainties on non-linear scales are among the main
obstacles to exploit the sensitivity of forthcoming galaxy and hydrogen
surveys like Euclid or the Square Kilometre Array (SKA). Here, we devise
a new method to model the theoretical error that goes beyond the usual
cut-off on small scales. The advantage of this more efficient
implementation of the non-linear uncertainties is tested through a
Markov-Chain-Monte-Carlo (MCMC) forecast of the sensitivity of Euclid
and SKA to the parameters of the standard ΛCDM model, including
massive neutrinos with total mass Mν, and to 3 extended
scenarios, including 1) additional relativistic degrees of freedom
(ΛCDM + Mν + Neff), 2) a deviation from
the cosmological constant (ΛCDM + Mν +
w0), and 3) a time-varying dark energy equation of state
parameter (ΛCDM + Mν + (w0,wa
)). We compare the sensitivity of 14 different combinations of
cosmological probes and experimental configurations. For Euclid combined
with Planck, assuming a plain cosmological constant, our method gives
robust predictions for a high sensitivity to the primordial spectral
index ns (σ(ns)=0.00085), the Hubble
constant H0 (σ(H0)=0.141 km/s/Mpc), the
total neutrino mass Mν (σ(Mν)=0.020
eV). Assuming dynamical dark energy we get
σ(Mν)=0.030 eV for the mass and
(σ(w0), σ(wa)) = (0.0214, 0.071) for
the equation of state parameters. The predicted sensitivity to
Mν is mostly stable against the extensions of the
cosmological model considered here. Interestingly, a significant
improvement of the constraints on the extended model parameters is also
obtained when combining Euclid with a low redshift HI intensity mapping
survey by SKA1, demonstrating the importance of the synergy of Euclid
and SKA.
AB - Theoretical uncertainties on non-linear scales are among the main
obstacles to exploit the sensitivity of forthcoming galaxy and hydrogen
surveys like Euclid or the Square Kilometre Array (SKA). Here, we devise
a new method to model the theoretical error that goes beyond the usual
cut-off on small scales. The advantage of this more efficient
implementation of the non-linear uncertainties is tested through a
Markov-Chain-Monte-Carlo (MCMC) forecast of the sensitivity of Euclid
and SKA to the parameters of the standard ΛCDM model, including
massive neutrinos with total mass Mν, and to 3 extended
scenarios, including 1) additional relativistic degrees of freedom
(ΛCDM + Mν + Neff), 2) a deviation from
the cosmological constant (ΛCDM + Mν +
w0), and 3) a time-varying dark energy equation of state
parameter (ΛCDM + Mν + (w0,wa
)). We compare the sensitivity of 14 different combinations of
cosmological probes and experimental configurations. For Euclid combined
with Planck, assuming a plain cosmological constant, our method gives
robust predictions for a high sensitivity to the primordial spectral
index ns (σ(ns)=0.00085), the Hubble
constant H0 (σ(H0)=0.141 km/s/Mpc), the
total neutrino mass Mν (σ(Mν)=0.020
eV). Assuming dynamical dark energy we get
σ(Mν)=0.030 eV for the mass and
(σ(w0), σ(wa)) = (0.0214, 0.071) for
the equation of state parameters. The predicted sensitivity to
Mν is mostly stable against the extensions of the
cosmological model considered here. Interestingly, a significant
improvement of the constraints on the extended model parameters is also
obtained when combining Euclid with a low redshift HI intensity mapping
survey by SKA1, demonstrating the importance of the synergy of Euclid
and SKA.
KW - Cosmological parameters from LSS
KW - Neutrino masses from cosmology
UR - http://www.scopus.com/inward/record.url?scp=85062278416&partnerID=8YFLogxK
U2 - 10.1088/1475-7516/2019/02/047
DO - 10.1088/1475-7516/2019/02/047
M3 - Article
SN - 1475-7516
VL - 2019
SP - 47
JO - Journal of Cosmology and Astroparticle Physics
JF - Journal of Cosmology and Astroparticle Physics
IS - 2
M1 - 047
ER -