  The refined de Sitter derivative conjecture provides constraints to
potentials that are low energy effective theories of quantum gravity. It can
give direct bounds on inflationary scenarios and determine whether the theory
is in the Landscape or the Swampland. Any infationary model can be checked by
these conditions and non-minimally coupled scalar field theory is not an
exception. We consider the Palatini Higgs inflation scenario taking the refined
de Sitter derivative conjecture into account. According to the latest
cosmological observations from Planck 2018, BICEP2+Keck and the bound of
non-minimal coupling parameter {\xi}, we suggest that if the refined dS
conjecture does indeed hold, then the Palatini Higgs inflation model cannot be
the low energy effective theory of a consistent quantum gravity theory since
the two parameters c1 and c2 are much smaller than order 1, which is
inconsistent with the refined dS conjecture. Therefore we suggest that it is in
the Swampland.

High Energy Physics - Theory