Can the Cosmic Vacuum Hypothesis Solve the Hubble Tension?

How do we measure the expansion of the Universe?

To solve the riddle of cosmic expansion, it is essential to understand the tools used by astronomers to determine the Hubble constant (H₀), which describes the rate of expansion of the Universe. Two main methods are employed, each providing different perspectives on cosmic history.

The first method is based on the study of cosmic microwave background (CMB), a fossil radiation dating back to 380,000 years after the Big Bang. This luminous vestige, observable in all directions, is almost perfectly uniform, but presents small variations. These fluctuations reveal crucial information about the state of the Universe in its early days.
By combining CMB observations with theoretical models, such as the ΛCDM (Lambda-Cold Dark Matter) model, cosmologists can reconstruct the evolution of the Universe and predict its current expansion rate. These calculations are based on parameters such as matter density, dark energy and the curvature of the Universe.

The problem lies in the divergence between these two approaches: measurements local data give a value of H₀ approximately 8% higher than that deduced from the CMB. This difference, well beyond the margins of error, poses a serious challenge to our…Read more on Science and Life

Christopher

With an unwavering passion for local news, Christopher leads our editorial team with integrity and dedication. With over 20 years’ experience, he is the backbone of Wouldsayso, ensuring that we stay true to our mission to inform.