Scalar field

"The last few decades have provided abundant evidence for physics beyond the two standard models of particle physics and . As is now known, the by far largest part of our universe's matter/energy content lies in the `dark' and consists of and . Despite intensive efforts on the experimental as well as the theoretical side, the origins of both are still completely unknown. Screened scalar fields have been hypothesized as potential candidates for dark energy or dark matter. Among these, some of the most prominent models are the , , and environment-dependent ."

"2. Are there any new elementary scalars not yet discovered with masses below the mass of the -like Higgs boson? For example, do -like particles exist? ... 8. If additional scalars are discovered, how will these discoveries impact the question of the stability of the ? 9. Do neutral (inert) scalars comprise a significant fraction of the dark matter?"