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- W3171800193 abstract "$Lambda$CDM is the standard model of big bang cosmology. In this model the dominant components of the universe are dark energy in the form of cosmological constant ($Lambda$), dark matter in the form of cold dark matter (CDM), and baryonic matter. Dark energy and dark matter comprise about 95% of the total density of the universe and they are often classified as the dark sector. Despite its successes in explaining numerous observational results, $Lambda$CDM still has several problems that are yet to be solved. Therefore the possibility that the dark sector takes other forms is still open.Around 2014 there was an indication of an emerging problem in cosmology. Researchers found a discrepancy in the measured value of the Hubble constant ($H_0$) from two independent methods, namely the cosmic distance ladder method and the cosmological method. Currently the discrepancy is at $4.4sigma$ and it is often referred as the $H_0$ tension. One possible cause of this tension is the existence of new physics beyond $Lambda$CDM. One of the proposed new physics is the presence of a non-gravitational interaction within dark sector components.This Final Project discusses the cosmic dynamics for the general phenomenological interaction model $Q = 3H(xi_crho_c+xi_xrho_x)$. We find that at the background level, such model may give the appropriate sequence of evolution as indicated by observations, which is a universe initially radiation-dominated, followed by matter domination, and finally dark energy domination. We also derived the cosmic dynamics at linear perturbation level for scalar mode. We modified the Boltzmann solver texttt{CAMB} to obtain the CMB and matter power spectra for the cases $Q = 3Hxi_crho_c$ and $Q=3Hxi_xrho_x$. We find that the presence of interaction affects the amplitude and the position of the acoustic peaks of the CMB power spectra on all scales. We also find that interaction of the form $Q = 3Hxi_xrho_x$ with energy transfer from dark energy to dark matter and $w_x<-1$ may help alleviate the textit{$H_0$ tension}." @default.
- W3171800193 created "2021-06-22" @default.
- W3171800193 creator A5091240808 @default.
- W3171800193 date "2020-09-05" @default.
- W3171800193 modified "2023-09-24" @default.
- W3171800193 title "Study of Universe with Dark Sector Interactions to Resolve Tension in the Measurements of Hubble Constant ($H_0$)" @default.
- W3171800193 hasPublicationYear "2020" @default.
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