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This research aims to measure the Hubble parameter H(z) to better understand the Universe's expansion history and dark energy.

Raising the bar: new constraints on the Hubble parameter with cosmic chronometers at z ∼ 2

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This research aims to measure the Hubble parameter H(z) to better understand the Universe's expansion history and dark energy.
Utilized cosmic chronometers with near-infrared spectroscopy of massive galaxies at redshift z > 1.4.
Estimated differential evolution and calibrated with stellar population synthesis models.
Included systematic uncertainties in the final error budget.
Achieved a new measurement of H(z) extending the coverage up to z ∼ 2.
Found a ∼5% improvement in cosmological parameters, specifically in ΩM and w0.
Forecasted continued enhancements using a simulation of a Euclid-like survey.

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Randomized trial measures Hubble parameter in galaxies at high redshifts, suggesting improved cosmological insights.

M. Moresco (2015) studied this question.

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