  We introduce the concept of quasi-metaparticles based on the theory of
metaparticles, the zero modes of the metastring. We apply the concept of
quasi-metaparticles to the problem of non-Fermi liquids and the properties of
strange metals. In particular, we point out that the quasi-metaparticle Green's
function interpolates between the canonical quasi-particle Green's function and
the result found in the context of the SYK model, which presents an exactly
solvable model without quasiparticles. The linear dependence of resistivity
with temperature is reproduced in the SYK limit. Also, the Cooper mechanism is
possible in the quasi-metaparticle case. Finally, the new parameter that
characterizes quasi-metaparticles can be extracted from ARPES data. Thus, the
quasi-metaparticle could be a useful new concept in the study of strange metals
and high-temperature superconductivity.
