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Abstract: We analyze the constraining power of future dark energy experiments forPseudo-Nambu Goldstone Boson PNGB quintessence. Following the Dark EnergyTask Force methodology, we forecast data for three experimental ``stages-:Stage 2 represents in-progress projects relevant to dark energy; Stage 3 refersto medium sized experiments; Stage 4 comprises larger projects. We determinethe posterior probability distribution for the parameters of the PNGB modelusing Markov Chain Monte Carlo analysis. Utilizing data generated on a $\LambdaCDM$ cosmology, we find that the relative power of the different data stages onPNGB quintessence is roughly comparable to the DETF results for the $w 0-w a$parametrization of dark energy. We also generate data based on a PNGBcosmological model that is consistent with a $\Lambda CDM$ fiducial model atStage 2. We find that Stage 4 data based on this PNGB fiducial model will ruleout a cosmological constant by at least $3 \sigma$.



Author: Augusta Abrahamse, Andreas Albrecht, Michael Barnard, Brandon Bozek

Source: https://arxiv.org/







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