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for questions on one dimensional algebraic varieties over any field, including questions of moduli, and questions about specific curves.

7 votes
Accepted

Quotient of a smooth curve by a finite group and differentials

Yes, the formula holds, even when the action is not free. Here is the principle of a proof for the case of a tame action (which covers the characteristic $0$ case). Denote by $\pi:X\to Y=X/G$ the quot …
Niels's user avatar
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5 votes

The use of embedding a curve into its Jacobian

In the section conjecture for a number field $k$: the proof of the injectivity of the map $$X(k)\to \mathrm{HomExt}_{G_k}(G_k,\pi_1(X,\overline{x}))$$ that attributes to a rational point a section o …
Niels's user avatar
  • 4,008
4 votes

Does a curve over a number field have a finite etale cover of given degree

This is not a complete answer, but I am trying to translate your issue in something more tractable. If you assume there exists a rational point $x$, then the image of the corresponding section $s=s_ …
Niels's user avatar
  • 4,008
7 votes

Hitchin fibration and Springer resolution

I will try to answer the first question only. As in the remarks, the canonical reference is Beauville, Narasimhan, Ramanan, Spectral curves and the generalised theta divisor. J. Reine Angew. Math. …
Niels's user avatar
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