Undergrad Is there a mechanism for creation of negative energy density

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The discussion explores the concept of negative energy density and whether mechanisms for its creation exist beyond the early universe. Currently, the only recognized instance is the Casimir effect, which suggests negative energy density in a mathematical context rather than a physical one. The Janus Cosmological Model introduces the idea of negative mass matter, potentially explaining phenomena attributed to dark matter and dark energy. This model implies that negative mass corresponds to negative energy, offering a theoretical solution to the inquiry. The conversation highlights the ongoing exploration of negative energy density in cosmology.
Christofer Br
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Excuse me for bad wording in the title, but there is only so much you can do with the character limit.
So, has there ever been a proposal for a mechanism through which negative energy density could be created? Or the only possibility considered so far was that it would have been created in the beginning of the universe?
 
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We don't know of anything with a negative energy density. It is possible to interpret the space between nearby conductors as region of negative energy density due to the Casimir effect, but that is mainly a mathematical bookkeeping tool.
 
The Janus Cosmological Model predicts existence of negative mass matter in space, which would account for the effects attributed to dark matter and dark energy. Negative mass matter means negative energy. Maybe it's an answer , if I'm getting your question right.
 

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