A cyclic order of a group is non-linear if any cut of it is not compatible with the group operation.
A cut of a cyclically ordered set is a linear order $<$ such that
- $a < b < c \implies [a, b, c]$
for any elements $a$, $b$, $c$ of the set.
A cut of a cyclically ordered group is compatible with the group operation ($+$) iff:
- $a < b \implies a + x < b + x$ and $x + a < x + b$
for any elements $a$, $b$, $x$ of the group.
I am trying to find properties of a non-linear cyclic order on fields:
- Is there an infinite field with a non-linear cyclic order on the additive group?
- Is there a field with a non-linear cyclic order on the additive group such that $[0, 1, -1]$ and $[0, x, 1]$ for some element $x$?
By picking any irrational real number $\alpha$, there is an injective map
$$ \mathbb{Q} \to \mathbb{T} : x \mapsto e^{2 \pi i \alpha x} $$
and thus (?) $\mathbb{Q}$ inherits a cyclic ordering from the one on $\mathbb{T}$. Since, in the comments, you say you only care about compatibility with addition, I imagine this serves as an example to both of your questions.