Space and astronomy news
The standard theory of cosmology is based upon four things: the structure of space and time, matter, dark matter, and dark energy. Of these, dark energy is the one we currently understand the least. Within the standard model, dark energy is part of the structure of space and time as described by general relativity. It is uniform throughout the cosmos and expressed as a parameter known as the cosmological constant.
General relativity is the simplest model with a metric tensor. Horndeski’s theory is the most general model with a metric tensor and allows for the presence of a uniform scalar field. There are special cases of Horndeski’s theory, such as the. Both of these models have been used to describe dark energy in a more general way, as well as dark matter in some cases.
Overall, the authors argue that the DESI observations make Horndeski’s theory a viable alternative to general relativity. That is, if the data holds up. The Dark Energy Spectroscopic Instrument is, and we don’t yet know what the final results will be. But it is clear that Einstein’s seat on the theoretical throne isn’t entirely assured, and Horndeski’s theory might just be the one to steal the crown.
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