The nature of dark energy is still not fully understood, and it remains a topic of ongoing research and speculation in cosmology and astrophysics. While it is an intriguing idea to consider dark energy as negative mass, the current understanding and observational evidence do not support this hypothesis.
Dark energy is a hypothetical form of energy that is thought to permeate all of space and drive the accelerated expansion of the universe. It was first proposed to explain the observations of distant supernovae in the late 1990s. The simplest explanation for dark energy is the cosmological constant, which is a constant energy density associated with space itself.
Negative mass, on the other hand, is a hypothetical concept that is not directly supported by any observational evidence. Negative mass would have unusual properties, such as repelling normal matter instead of attracting it through gravity. While negative mass has been explored theoretically in some contexts, there is no direct indication that dark energy behaves in this manner.
The effects of dark energy on the expansion of the universe can be adequately described using the concept of a positive energy density that contributes to a repulsive gravitational effect. This interpretation is consistent with the observed acceleration of the universe's expansion. However, the precise nature and origin of dark energy remain open questions in cosmology, and ongoing research aims to better understand its properties and underlying mechanisms.