Diagonal forms of higher degree over function fields of $p$-adic curves

Abstract

We investigate diagonal forms of degree $d$ over the function field $F$ of a smooth projective $p$-adic curve: if a form is isotropic over the completion of $F$ with respect to each discrete valuation of $F$, then it is isotropic over certain fields $F_U$, $F_P$ and $F_p$. These fields appear naturally when applying the methodology of patching; $F$ is the inverse limit of the finite inverse system of fields $\{F_U,F_P,F_p\}$. Our observations complement some known bounds on the higher $u$-invariant of diagonal forms of degree $d$. We only consider diagonal forms of degree $d$ over fields of characteristic not dividing $d!$.

Some small corrections/changes have been done with respect to the first version

References in corpus (1)

• Applications of patching to quadratic forms and central simple algebras

Cited by in corpus (1)

• There is no 290-Theorem for higher degree forms