Probing Gravitational Dark Matter

Understand

So far all evidences of dark matter (DM) come from astrophysical and cosmological observations, due to gravitational interactions of the DM.

• It is possible that the true DM particle in the universe joins gravitational interactions only, but nothing else.
• Such a Gravitational DM (GDM) acts as a weakly interacting massive particle (WIMP), which is conceptually simple and attractive.
• In this work, we explore this direction by constructing the simplest scalar GDM particle $\chi_s$.