Does the "fifth force" exist?

An additional exponential (Yukawa) type term to the Newton gravitation potential, i.e., the so-called "fifth force" remains a candidate in order to explain astrophysical and cosmological "dark matter" phenomena. This modification of gravity also results from affine gauge theory. Its experimental verification attracted much attention in 80-90^th, but nothing was found at laboratory and planetary distances in accordance with the following diagram in arXiv: hep-ph/9606249:

At present fifth forces at the sub-Angstrom length scale again are investigated (#).

Archive