Our current model of the universe may be deeply flawed, unless space is actually a 'sticky fluid', new research suggests. Recent observations have revealed that our understanding of the cosmos is flawed, but it may be because the universe is 'stickier' than we assumed, new research proposes. In a paper published on the arXiv preprint server, Muhammad Ghulam Khuwajah Khan, a researcher at the Indian Institute of Technology, suggests that space may possess a property called bulk viscosity. This concept is similar to the viscosity of a fluid, but it describes the resistance of the vacuum itself when space expands. Traditionally, scientists have used a simple model to describe the universe, known as Lambda-CDM. However, data from the Dark Energy Spectroscopic Instrument (DESI) has hinted that our understanding of dark energy may be fundamentally wrong. The new observations showed a slight mismatch between our standard theories and the actual rate at which galaxies are moving away from us. To explain this discrepancy, Khan proposed a model involving spatial 'phonons', which are collective vibrations of atoms in a crystal, applied to the fabric of space. These longitudinal vibrations, acting as sound waves of the vacuum, could be responsible for a viscous effect that slows the expansion of the cosmos. By treating the universe as a viscous fluid, this model introduces a drag on cosmic expansion. As space stretches, these spatial phonons slosh around, creating a pressure that opposes the outward push. The study shows that this simple, data-based model fits the DESI data with great precision, potentially solving some of the issues caused by the standard cosmological constant. However, we should approach this with caution. This is merely a guess, and viscous dark energy would represent a significant shift in how we view the vacuum of space. The hard data from DESI is still being analyzed by the scientific community, and we are not yet sure if this viscosity is a fundamental property of nature or just a result of our current measurements. The next decade of data from missions like the Euclid space telescope and continued monitoring by DESI will be crucial. We need more observations to determine if these ghostly vibrations truly control the cosmos or if space is as smooth as we once believed.
