Newspace parameters
comment: Compute space of new eigenforms
[N,k,chi] = [1089,3,Mod(604,1089)]
mf = mfinit([N,k,chi],0)
lf = mfeigenbasis(mf)
from sage.modular.dirichlet import DirichletCharacter
H = DirichletGroup(1089, base_ring=CyclotomicField(2))
chi = DirichletCharacter(H, H._module([0, 1]))
N = Newforms(chi, 3, names="a")
//Please install CHIMP (https://github.com/edgarcosta/CHIMP) if you want to run this code
chi := DirichletCharacter("1089.604");
S:= CuspForms(chi, 3);
N := Newforms(S);
| Level: | \( N \) | \(=\) | \( 1089 = 3^{2} \cdot 11^{2} \) |
| Weight: | \( k \) | \(=\) | \( 3 \) |
| Character orbit: | \([\chi]\) | \(=\) | 1089.c (of order \(2\), degree \(1\), minimal) |
Newform invariants
comment: select newform
sage: f = N[0] # Warning: the index may be different
gp: f = lf[1] \\ Warning: the index may be different
| Self dual: | no |
| Analytic conductor: | \(29.6731007888\) |
| Analytic rank: | \(0\) |
| Dimension: | \(4\) |
| Coefficient field: | \(\Q(\sqrt{-2}, \sqrt{3})\) |
|
comment: defining polynomial
gp: f.mod \\ as an extension of the character field
|
|
| Defining polynomial: |
\( x^{4} + 4x^{2} + 1 \)
|
| Coefficient ring: | \(\Z[a_1, \ldots, a_{7}]\) |
| Coefficient ring index: | \( 1 \) |
| Twist minimal: | no (minimal twist has level 363) |
| Sato-Tate group: | $\mathrm{SU}(2)[C_{2}]$ |
$q$-expansion
comment: q-expansion
sage: f.q_expansion() # note that sage often uses an isomorphic number field
gp: mfcoefs(f, 20)
Coefficients of the \(q\)-expansion are expressed in terms of a basis \(1,\beta_1,\beta_2,\beta_3\) for the coefficient ring described below. We also show the integral \(q\)-expansion of the trace form.
Basis of coefficient ring in terms of a root \(\nu\) of
\( x^{4} + 4x^{2} + 1 \)
:
| \(\beta_{1}\) | \(=\) |
\( \nu \)
|
| \(\beta_{2}\) | \(=\) |
\( \nu^{2} + 2 \)
|
| \(\beta_{3}\) | \(=\) |
\( \nu^{3} + 4\nu \)
|
| \(\nu\) | \(=\) |
\( \beta_1 \)
|
| \(\nu^{2}\) | \(=\) |
\( \beta_{2} - 2 \)
|
| \(\nu^{3}\) | \(=\) |
\( \beta_{3} - 4\beta_1 \)
|
Character values
We give the values of \(\chi\) on generators for \(\left(\mathbb{Z}/1089\mathbb{Z}\right)^\times\).
| \(n\) | \(244\) | \(848\) |
| \(\chi(n)\) | \(-1\) | \(1\) |
Embeddings
For each embedding \(\iota_m\) of the coefficient field, the values \(\iota_m(a_n)\) are shown below.
For more information on an embedded modular form you can click on its label.
comment: embeddings in the coefficient field
gp: mfembed(f)
| Label | \(\iota_m(\nu)\) | \( a_{2} \) | \( a_{3} \) | \( a_{4} \) | \( a_{5} \) | \( a_{6} \) | \( a_{7} \) | \( a_{8} \) | \( a_{9} \) | \( a_{10} \) | ||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 604.1 |
|
− | 3.34607i | 0 | −7.19615 | 8.66025 | 0 | 8.10634i | 10.6945i | 0 | − | 28.9778i | ||||||||||||||||||||||||||||
| 604.2 | − | 0.896575i | 0 | 3.19615 | −8.66025 | 0 | 3.20736i | − | 6.45189i | 0 | 7.76457i | |||||||||||||||||||||||||||||
| 604.3 | 0.896575i | 0 | 3.19615 | −8.66025 | 0 | − | 3.20736i | 6.45189i | 0 | − | 7.76457i | |||||||||||||||||||||||||||||
| 604.4 | 3.34607i | 0 | −7.19615 | 8.66025 | 0 | − | 8.10634i | − | 10.6945i | 0 | 28.9778i | |||||||||||||||||||||||||||||
Inner twists
| Char | Parity | Ord | Mult | Type |
|---|---|---|---|---|
| 1.a | even | 1 | 1 | trivial |
| 11.b | odd | 2 | 1 | inner |
Twists
| By twisting character orbit | |||||||
|---|---|---|---|---|---|---|---|
| Char | Parity | Ord | Mult | Type | Twist | Min | Dim |
| 1.a | even | 1 | 1 | trivial | 1089.3.c.d | 4 | |
| 3.b | odd | 2 | 1 | 363.3.c.b | ✓ | 4 | |
| 11.b | odd | 2 | 1 | inner | 1089.3.c.d | 4 | |
| 33.d | even | 2 | 1 | 363.3.c.b | ✓ | 4 | |
| 33.f | even | 10 | 4 | 363.3.g.c | 16 | ||
| 33.h | odd | 10 | 4 | 363.3.g.c | 16 | ||
| By twisted newform orbit | |||||||
|---|---|---|---|---|---|---|---|
| Twist | Min | Dim | Char | Parity | Ord | Mult | Type |
| 363.3.c.b | ✓ | 4 | 3.b | odd | 2 | 1 | |
| 363.3.c.b | ✓ | 4 | 33.d | even | 2 | 1 | |
| 363.3.g.c | 16 | 33.f | even | 10 | 4 | ||
| 363.3.g.c | 16 | 33.h | odd | 10 | 4 | ||
| 1089.3.c.d | 4 | 1.a | even | 1 | 1 | trivial | |
| 1089.3.c.d | 4 | 11.b | odd | 2 | 1 | inner | |
Hecke kernels
This newform subspace can be constructed as the kernel of the linear operator
\( T_{2}^{4} + 12T_{2}^{2} + 9 \)
acting on \(S_{3}^{\mathrm{new}}(1089, [\chi])\).
Hecke characteristic polynomials
| $p$ | $F_p(T)$ |
|---|---|
| $2$ |
\( T^{4} + 12T^{2} + 9 \)
|
| $3$ |
\( T^{4} \)
|
| $5$ |
\( (T^{2} - 75)^{2} \)
|
| $7$ |
\( T^{4} + 76T^{2} + 676 \)
|
| $11$ |
\( T^{4} \)
|
| $13$ |
\( T^{4} + 316T^{2} + 121 \)
|
| $17$ |
\( T^{4} + 804 T^{2} + 106929 \)
|
| $19$ |
\( T^{4} + 1216 T^{2} + 30976 \)
|
| $23$ |
\( (T^{2} - 18 T + 78)^{2} \)
|
| $29$ |
\( T^{4} + 1668 T^{2} + 567009 \)
|
| $31$ |
\( (T^{2} + 24 T + 132)^{2} \)
|
| $37$ |
\( (T^{2} + 60 T + 873)^{2} \)
|
| $41$ |
\( T^{4} + 2172 T^{2} + 881721 \)
|
| $43$ |
\( T^{4} + 1828 T^{2} + 662596 \)
|
| $47$ |
\( (T^{2} - 96 T + 852)^{2} \)
|
| $53$ |
\( (T^{2} - 30 T - 1227)^{2} \)
|
| $59$ |
\( (T^{2} + 30 T - 6402)^{2} \)
|
| $61$ |
\( T^{4} + 13852 T^{2} + 37724164 \)
|
| $67$ |
\( (T^{2} - 6 T - 5034)^{2} \)
|
| $71$ |
\( (T^{2} - 54 T - 858)^{2} \)
|
| $73$ |
\( T^{4} + 2284 T^{2} + 784996 \)
|
| $79$ |
\( T^{4} + 21952 T^{2} + 119421184 \)
|
| $83$ |
\( T^{4} + 1344 T^{2} + 389376 \)
|
| $89$ |
\( (T^{2} - 108 T - 2127)^{2} \)
|
| $97$ |
\( (T^{2} + 208 T + 7549)^{2} \)
|
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