Hairy Black-holes in Shift-symmetric Theories
  Scalar hair of black holes in theories with a shift symmetry are constrained
by the no-hair theorem of Hui and Nicolis, assuming spherical symmetry,
time-independence of the scalar field and asymptotic flatness. The most studied
counterexample is a linear coupling of the scalar with the Gauss-Bonnet
invariant. However, in this case the norm of the shift-symmetry current $J^2$
diverges at the horizon casting doubts on whether the solution is physically
sound. We show that this is not an issue since $J^2$ is not a scalar quantity,
since $J^\mu$ is not a diff-invariant current in the presence of Gauss-Bonnet.
The same theory can be written in Horndeski form with a non-analytic function
$G_5 \sim \log X$. In this case the shift-symmetry current is diff-invariant,
but contains powers of $X$ in the denominator, so that its divergence at the
horizon is again immaterial. We confirm that other hairy solutions in the
presence of non-analytic Horndeski functions are pathological, featuring
divergences of physical quantities as soon as one departs from
time-independence and spherical symmetry. We generalise the no-hair theorem to
Beyond Horndeski and DHOST theories, showing that the coupling with
Gauss-Bonnet is necessary to have hair.
