The heights tag has no wiki summary.
2
votes
0answers
110 views
Must the coordinates of a polynomial iteration have about the same size?
Original post. The following statements seem plausible (not to say intuitively obvious), but I do not see how to prove them.
Let us say that a polynomial mapping of $\mathbb{C}^2$ is reducible if ...
4
votes
1answer
374 views
Examples of “nice” properties of algebraic extensions of $\mathbb{Q}$
I am writing a short survey of some "nice'' properties of algebraic extensions of $\mathbb{Q}$. Let's say a property (P) is nice if
every finite extension of $\mathbb{Q}$ satisfies (P), and
if $K ...
1
vote
0answers
93 views
algebraicity of Néron-Tate canonical height for Abelian varieties over global function fields
(transcendence of canonical heights)
Is the Néron-Tate canonical height for an Abelian variety $A$ over a global function field $K$, $\hat{h}: A(K) \times A^\vee(K) \to \mathbf{R}$ known to always ...
3
votes
1answer
174 views
relation between Faltings height and periods
Let $E$ be an elliptic curve defined by an equation $y^2=4x^3+ax+b$ where $a$ and $b$ are algebraic numbers. What is the relation between the Faltings height $h_F(E)$ and the periods
$$
\int_{\gamma} ...
5
votes
2answers
264 views
Reference request for the theory of heights over function fields
I am looking for an article or book where the theory of heights over function fields (in any characteristic) is treated. I am especially interested in Northcott-type statements. For instance, over a ...
6
votes
2answers
480 views
questions on Néron-Tate canonical height
I have three questions regarding height pairings:
In [Serre, Lectures on the Mordell-Weil theorem], p. 85 f., it is stated that the following function is a local height function:
"Let $V/R$ be a ...
3
votes
1answer
479 views
Does the Mordell conjecture imply the Shafarevich conjecture
The base field is a number field.
It is known that the Shafarevich conjecture implies the Mordell conjecture (Kodaira-Parshin).
Is the converse also true?
Note that both conjectures are now ...
1
vote
0answers
216 views
modern reference for Néron's “Quasi-fonctions et Hauteurs sur les Varietes Abeliennes”
Is there a modern reference for Néron's "Quasi-fonctions et Hauteurs sur les Varietes Abeliennes" http://www.jstor.org/pss/1970644 i.e. using Grothendieck's language of schemes and in English?
3
votes
2answers
271 views
Almost Northcott properties for heights of abelian varieties
Let $h$ be a function on the moduli space of abelian varieties of dimension $g$ over $\overline{\mathbf{Q}}$.
Let $K$ be a number field and let $g\geq 2$ be an integer. Fix a real number $C$. Does ...
1
vote
1answer
180 views
Is there an easier argument to prove that almost all of these curves have no semi-stable reduction
Fix a number field $K$ and a polynomial $F(x)\in K[x]$ of degree at least $4$. For a squarefree integer $d$, define the curve $X_d$ over $K$ by the equation $dy^2 = F(x)$. Note that the curves $X_d$ ...
10
votes
2answers
335 views
Records for low-height points on elliptic curves over number fields
Elkies maintains a list of nontorsion points of low height on elliptic curves over Q; does anyone know of anything similar for curves over number fields?
Everest and Ward give examples of points of ...
9
votes
1answer
517 views
Which curves have stable Faltings height greater or equal to 1
Let $Y$ be a smooth projective connected curve of genus $g>0$ over $\overline{\mathbf{Q}}$. Let $h_{\textrm{Fal}}(Y)$ be the Faltings height of $Y$.
Question 1. Can one classify or describe the ...
4
votes
2answers
489 views
Comparing the height of an algebraic number with the height of its conjugates
Let $\bar{\mathbf{Q}}$ be an algebraic closure of the rationals, and $\alpha$ denote an algebraic number in $\bar{\mathbf{Q}}$. We define the height of $\alpha$, denoted by $H(\alpha)$, to be ...
19
votes
2answers
1k views
The divisor bound in number fields
The divisor bound asserts that for a large (rational) integer $n \in {\bf Z}$, the number of divisors of $n$ is at most $n^{o(1)}$ as $n \to \infty$. It is not difficult to prove this bound using the ...
10
votes
2answers
848 views
Families of curves for which the Belyi degree can be easily bounded
I know (edit: three) families of smooth projective connected curves over $\bar{\mathbf{Q}}$ for which the Belyi degree is not hard to bound from above.
The modular curves $X(n)$. They are ...
6
votes
1answer
461 views
Beilinson's height pairing vs Neron-Tate
In the literature there are several different definitions of what is often referred to as Beilinson's height pairing (see for example section 4.3.8 of Gillet and Soulé's paper Arithmetic intersection ...
1
vote
2answers
201 views
Equidistribution in the unit interval of numbers in a real field with bounded Mahler measure
Let $K$ be a real number field, together with a fixed immersion in $\mathbb{R}$, and for each positive real number $M$ consider the set $S_M(K)$ of elements in $K \cap [0,1]$ having Mahler measure ...
13
votes
4answers
842 views
Torsion points in Abelian varieties over number fields
Hello,
Suppose $A$ is an Abelian variety of dimension $g$ over a number field $k$. Then using height functions one can show that there are non-torsion points in $A(\bar k)$. This looks like an ...
11
votes
1answer
545 views
Is there a canonical height on the Weil-Chatelet group?
Jon Hanke and I were just chatting and realized we didn't know the answer to the following question. If E is an elliptic curve over a number field, is there in any sense a "canonical height" on the ...
