Fifth-Force Screening around Extremely Compact Sources
  Many non-linear scalar field theories possess a screening mechanism that can
suppress any associated fifth force in dense environments. As a result, these
theories can evade local experimental tests of new forces. Chameleon-like
screening, which occurs because of non-linearities in the scalar potential or
the coupling to matter, is well understood around extended objects. However,
many experimental tests of these theories involve objects with spatial extent
much smaller than the scalar field's Compton wavelength, and which could
therefore be considered point-like. In this work, we determine how the fifth
forces are screened in the limit that the source objects become extremely
compact.
