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Please use this identifier to cite or link to this item: http://dspace.bits-pilani.ac.in:8080/jspui/handle/123456789/18449
Title: Probing dark energy using anisotropies in the clustering of post-EoR H i distribution
Authors: Sarkar, Tapomoy Guha
Keywords: Physics
Anisotropy signal
BAO signature
Issue Date: 2025
Publisher: IOP
Abstract: We propose an anisotropy quantifier of the H i 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 ∼ 10 in both auto-correlation and in cross-correlation with the Ly-α forest over a wide z and k-range. We propose to use the BAO signature on the anisotropy signal to measure ( H(z), DA(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.
URI: https://iopscience.iop.org/article/10.1088/1475-7516/2025/01/070/meta
http://dspace.bits-pilani.ac.in:8080/jspui/handle/123456789/18449
Appears in Collections:Department of Physics

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