论文标题
重新取电后21厘米信号及其互相关的强度映射，作为$ f（r）$重力的探针
Intensity mapping of post-reionization 21-cm signal and its cross-correlations as a probe of $f(R)$ gravity
论文作者
论文摘要
我们提出了重新调整时期的红移HI 21-CM信号的强度映射，作为$ f（r）$重力的宇宙学探针。我们考虑$ f（r）$重力模型的Hu-sawicki类，其特征是单个参数$ f _ {，r0} $。重力修饰的$ f（r）$修饰会通过变化密度波动的增长速度来影响$ 21 $ -CM的功率谱。我们发现，在自动相关和与Galaxy弱透镜和Ly-$α$ Forest的自动相关和互相关方面，具有SKA1-MID（如射电望远镜）的无线电干涉量学观察可以将$ f（r）$型号与$ lcdm $ cosmology区分开，精确地与其他p（r）$ f（r）$ GREAT的探针竞争。
We propose the intensity mapping of the redshifted HI 21-cm signal from the post-reionization epoch as a cosmological probe of $f(R)$ gravity. We consider the Hu-Sawicki class of $f(R)$ gravity models characterized by a single parameter $f_{,R0}$. The $f(R)$ modification to gravity affects the post-reionization $21$-cm power spectrum through the change in the growth rate of density fluctuations. We find that a radio interferometric observation with a SKA1-Mid like radio telescope in both auto-correlation and cross-correlation with galaxy weak-lensing and Ly-$α$ forest may distinguish $f(R)$ models from $LCDM$ cosmology at a precision which is competitive with other probes of $f(R)$ gravity.
