Prospects for measuring dark energy with 21 cm intensity mapping experiments

نویسندگان

چکیده

Using the 21 cm intensity mapping (IM) technique can efficiently perform large-scale neutral hydrogen surveys, and this method has great potential for measuring dark-energy parameters. Some IM experiments aiming at dark energy in redshift range of $0<z<3$ have been proposed performed, which typical ones using single-dish mode include e.g., BINGO, FAST, SKA1-MID, those interferometric HIRAX, CHIME, Tianlai. In work, we make a forecast these on their capability parameters energy. We find that interferometers advantages constraining cosmological particular, Tianlai cylinder array alone achieve standard precision cosmology $\Lambda$CDM model (i.e., is better than 1%). However, dynamical energy, SKA1-MID performs very well. show simulated data break parameter degeneracies inherent CMB data, CMB+SKA1-MID offers $\sigma(w)=0.013$ $w$CDM model, $\sigma(w_0)=0.080$ $\sigma(w_a)=0.25$ CPL model. Compared with CMB+BAO+SN, provide tighter constraints $w$CDM, but looser (tighter CMB+BAO) CPL, combination CMB+BAO+SN+Tianlai gives $\sigma(w)=0.013$, $\sigma(w_0)=0.055$, $\sigma(w_a)=0.13$. addition, it found synergy FAST ($0<z<0.35$)+SKA1-MID ($0.35<z<0.77$)+Tianlai ($0.77<z<2.55$) promising survey strategy. Finally, residual foreground contamination amplitude considerable impact constraint results. future will powerful probe exploring nature

برای دانلود رایگان متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Constraining dark matter through 21 cm observations

Beyond reionization epoch cosmic hydrogen is neutral and can be directly observed through its 21 cm line signal. If dark matter (DM) decays or annihilates the corresponding energy input affects the hydrogen kinetic temperature and ionized fraction, and contributes to the Lyα background. The changes induced by these processes on the 21 cm signal can then be used to constrain the proposed DM cand...

متن کامل

Intensity Mapping with Carbon Monoxide Emission Lines and the Redshifted 21 Cm Line

We quantify the prospects for using emission lines from rotational transitions of the CO molecule to perform an ‘intensity mapping’ observation at high redshift during the Epoch of Reionization (EoR). The aim of CO intensity mapping is to observe the combined CO emission from many unresolved galaxies, to measure the spatial fluctuations in this emission, and use this as a tracer of large scale ...

متن کامل

Prospects for Redshifted 21-cm Observations of Quasar Hii Regions

The introduction of low-frequency radio arrays over the coming decade is expected to revolutionize the study of the reionization epoch. Observation of the contrast in redshifted 21cm emission between a large H II region and the surrounding neutral IGM will be the simplest and most easily interpreted signature. We assess the sensitivity of three generations of planned low-frequency arrays to qua...

متن کامل

Baryon acoustic oscillation intensity mapping of dark energy.

The expansion of the Universe appears to be accelerating, and the mysterious antigravity agent of this acceleration has been called "dark energy." To measure the dynamics of dark energy, baryon acoustic oscillations (BAO) can be used. Previous discussions of the BAO dark energy test have focused on direct measurements of redshifts of as many as 10(9) individual galaxies, by observing the 21 cm ...

متن کامل

Projected constraints on modified gravity cosmologies from 21 cm intensity mapping

Kiyoshi Wesley Masui,* Fabian Schmidt, Ue-Li Pen, and Patrick McDonald1,x Canadian Institute for Theoretical Astrophysics, 60 St. George Street Toronto, Ontario, M5S 3H8, Canada Department of Physics, University of Toronto, 60 St. George Street Toronto, Ontario, M5S 1A7, Canada Theoretical Astrophysics, California Institute of Technology M/C 35 0-17, Pasadena, California 91125-0001, USA (Receiv...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

ژورنال

عنوان ژورنال: Journal of Cosmology and Astroparticle Physics

سال: 2022

ISSN: ['1475-7516', '1475-7508']

DOI: https://doi.org/10.1088/1475-7516/2022/01/060