Probing dark energy using anisotropies in the clustering of post-EoR HI distribution

Autor:	Dash, Chandrachud B. V., Sarkar, Tapomoy Guha
Rok vydání:	2024
Předmět:	Astrophysics - Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology
Druh dokumentu:	Working Paper
Popis:	We propose an anisotropy quantifier of the HI 21-cm signal traditionally used to clock the astrophysics of the reionization era as a post-reionization dark energy diagnostic. We find that the anisotropy probe can be measured at SNR $\sim 10$ in both auto-correlation and in cross-correlation with the Ly-$\alpha$ forest over a wide $z$ and $k-$range. We propose to use the BAO signature on the anisotropy signal to measure $( H(z), D_A(z))$. Subsequently, we put constraints on a dark energy model involving a negative cosmological constant on top of a quintessence scalar field and find that such a model is consistent with futuristic observations. Comment: Submitted
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/2405.03195 Zobrazit plný text záznamu View this record from Arxiv