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All cosmological models with a non-zero cosmological constant will approach a de Sitter universe in the far future. In theory this can means that the most basic group of particle physics should be the de Sitter rather than Poincaré. Mass is a Casmir operator of the Poincare

**but not**of the Sitter.

If we suppose above, will a massless electron be stable if the universe approach a de Sitter universe in the far future ? According my information a massless electron cannot be stable according our current physic model.

What will happen with the electron if the universe approach a de Sitter universe, and we assume that this means the basic group of particle physics will be the de Sitter ?

I did some research but I am not sure if below URL is relevant for my question or not.

URL: https://arxiv.org/abs/hep-th/0612184

Thank you very much,