The Faltings height of an elliptic curve $E$ defined over $\Q$ is the quantity $$ h_{\mathrm{Faltings}}(E) = -\frac{1}{2}\log(A), $$ where $A$ is the covolume (that is, the area of a fundamental period parallelogram) of the Néron lattice of $E$.
The stable Faltings height of $E$ is $$ h_{\mathrm{stable}}(E) = \frac{1}{12}(\log\mathrm{denom}(j)-\log(|\Delta|)) - \frac{1}{2}\log(A), $$ where $j$ is the $j$-invariant of $E$, $\Delta$ the discriminant of any model of $E$ and $A$ the covolume of the period lattice of that model. The stable height is independent of the model of $E$, and the unstable and stable heights are equal for semistable curves, for which $\mathrm{denom}(j)=|\Delta|$.
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- Last edited by John Cremona on 2024-11-18 13:43:25
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- ec.q.faltings_ratio
- lmfdb/elliptic_curves/elliptic_curve.py (line 463)
- lmfdb/elliptic_curves/elliptic_curve.py (line 1368)
- lmfdb/elliptic_curves/templates/ec-curve.html (line 225)
- lmfdb/elliptic_curves/templates/ec-curve.html (line 231)
- lmfdb/elliptic_curves/templates/ec-isoclass.html (line 143)
- lmfdb/elliptic_curves/templates/sw_ecdb.html (line 52)
- 2024-11-18 13:43:25 by John Cremona
- 2021-03-22 09:53:05 by John Cremona
- 2020-12-12 09:54:15 by John Cremona