Newspace parameters
comment: Compute space of new eigenforms
[N,k,chi] = [528,4,Mod(65,528)]
mf = mfinit([N,k,chi],0)
lf = mfeigenbasis(mf)
from sage.modular.dirichlet import DirichletCharacter
H = DirichletGroup(528, base_ring=CyclotomicField(2))
chi = DirichletCharacter(H, H._module([0, 0, 1, 1]))
N = Newforms(chi, 4, names="a")
//Please install CHIMP (https://github.com/edgarcosta/CHIMP) if you want to run this code
chi := DirichletCharacter("528.65");
S:= CuspForms(chi, 4);
N := Newforms(S);
| Level: | \( N \) | \(=\) | \( 528 = 2^{4} \cdot 3 \cdot 11 \) |
| Weight: | \( k \) | \(=\) | \( 4 \) |
| Character orbit: | \([\chi]\) | \(=\) | 528.b (of order \(2\), degree \(1\), not 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: | \(31.1530084830\) |
| Analytic rank: | \(0\) |
| Dimension: | \(4\) |
| Coefficient field: | \(\Q(\sqrt{-3}, \sqrt{-11})\) |
|
comment: defining polynomial
gp: f.mod \\ as an extension of the character field
|
|
| Defining polynomial: |
\( x^{4} - x^{3} - 2x^{2} - 3x + 9 \)
|
| Coefficient ring: | \(\Z[a_1, \ldots, a_{5}]\) |
| Coefficient ring index: | \( 2^{2}\cdot 3^{2} \) |
| Twist minimal: | no (minimal twist has level 132) |
| Sato-Tate group: | $\mathrm{U}(1)[D_{2}]$ |
$q$-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
\( x^{4} - x^{3} - 2x^{2} - 3x + 9 \)
:
| \(\beta_{1}\) | \(=\) |
\( ( -\nu^{3} + 10\nu^{2} + 2\nu - 9 ) / 6 \)
|
| \(\beta_{2}\) | \(=\) |
\( ( -2\nu^{3} - 4\nu^{2} + 10\nu + 9 ) / 3 \)
|
| \(\beta_{3}\) | \(=\) |
\( -\nu^{3} + 4 \)
|
| \(\nu\) | \(=\) |
\( ( -4\beta_{3} + 5\beta_{2} + 4\beta _1 + 7 ) / 18 \)
|
| \(\nu^{2}\) | \(=\) |
\( ( -\beta_{3} - \beta_{2} + 10\beta _1 + 22 ) / 18 \)
|
| \(\nu^{3}\) | \(=\) |
\( -\beta_{3} + 4 \)
|
Character values
We give the values of \(\chi\) on generators for \(\left(\mathbb{Z}/528\mathbb{Z}\right)^\times\).
| \(n\) | \(133\) | \(145\) | \(353\) | \(463\) |
| \(\chi(n)\) | \(1\) | \(-1\) | \(-1\) | \(1\) |
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 | \(\iota_m(\nu)\) | \( a_{2} \) | \( a_{3} \) | \( a_{4} \) | \( a_{5} \) | \( a_{6} \) | \( a_{7} \) | \( a_{8} \) | \( a_{9} \) | \( a_{10} \) | ||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 65.1 |
|
0 | −4.87228 | − | 1.80579i | 0 | 8.95521i | 0 | 0 | 0 | 20.4783 | + | 17.5966i | 0 | ||||||||||||||||||||||||||
| 65.2 | 0 | −4.87228 | + | 1.80579i | 0 | − | 8.95521i | 0 | 0 | 0 | 20.4783 | − | 17.5966i | 0 | ||||||||||||||||||||||||||
| 65.3 | 0 | 0.872281 | − | 5.12241i | 0 | 22.2217i | 0 | 0 | 0 | −25.4783 | − | 8.93637i | 0 | |||||||||||||||||||||||||||
| 65.4 | 0 | 0.872281 | + | 5.12241i | 0 | − | 22.2217i | 0 | 0 | 0 | −25.4783 | + | 8.93637i | 0 | ||||||||||||||||||||||||||
Inner twists
| Char | Parity | Ord | Mult | Type |
|---|---|---|---|---|
| 1.a | even | 1 | 1 | trivial |
| 11.b | odd | 2 | 1 | CM by \(\Q(\sqrt{-11}) \) |
| 3.b | odd | 2 | 1 | inner |
| 33.d | even | 2 | 1 | inner |
Twists
| By twisting character orbit | |||||||
|---|---|---|---|---|---|---|---|
| Char | Parity | Ord | Mult | Type | Twist | Min | Dim |
| 1.a | even | 1 | 1 | trivial | 528.4.b.b | 4 | |
| 3.b | odd | 2 | 1 | inner | 528.4.b.b | 4 | |
| 4.b | odd | 2 | 1 | 132.4.b.a | ✓ | 4 | |
| 11.b | odd | 2 | 1 | CM | 528.4.b.b | 4 | |
| 12.b | even | 2 | 1 | 132.4.b.a | ✓ | 4 | |
| 33.d | even | 2 | 1 | inner | 528.4.b.b | 4 | |
| 44.c | even | 2 | 1 | 132.4.b.a | ✓ | 4 | |
| 132.d | odd | 2 | 1 | 132.4.b.a | ✓ | 4 | |
| By twisted newform orbit | |||||||
|---|---|---|---|---|---|---|---|
| Twist | Min | Dim | Char | Parity | Ord | Mult | Type |
| 132.4.b.a | ✓ | 4 | 4.b | odd | 2 | 1 | |
| 132.4.b.a | ✓ | 4 | 12.b | even | 2 | 1 | |
| 132.4.b.a | ✓ | 4 | 44.c | even | 2 | 1 | |
| 132.4.b.a | ✓ | 4 | 132.d | odd | 2 | 1 | |
| 528.4.b.b | 4 | 1.a | even | 1 | 1 | trivial | |
| 528.4.b.b | 4 | 3.b | odd | 2 | 1 | inner | |
| 528.4.b.b | 4 | 11.b | odd | 2 | 1 | CM | |
| 528.4.b.b | 4 | 33.d | even | 2 | 1 | inner | |
Hecke kernels
This newform subspace can be constructed as the intersection of the kernels of the following linear operators acting on \(S_{4}^{\mathrm{new}}(528, [\chi])\):
|
\( T_{5}^{4} + 574T_{5}^{2} + 39601 \)
|
|
\( T_{17} \)
|
Hecke characteristic polynomials
| $p$ | $F_p(T)$ |
|---|---|
| $2$ |
\( T^{4} \)
|
| $3$ |
\( T^{4} + 8 T^{3} + \cdots + 729 \)
|
| $5$ |
\( T^{4} + 574 T^{2} + 39601 \)
|
| $7$ |
\( T^{4} \)
|
| $11$ |
\( (T^{2} + 1331)^{2} \)
|
| $13$ |
\( T^{4} \)
|
| $17$ |
\( T^{4} \)
|
| $19$ |
\( T^{4} \)
|
| $23$ |
\( T^{4} + 35998 T^{2} + 253009 \)
|
| $29$ |
\( T^{4} \)
|
| $31$ |
\( (T^{2} + 340 T + 26227)^{2} \)
|
| $37$ |
\( (T^{2} + 434 T + 36397)^{2} \)
|
| $41$ |
\( T^{4} \)
|
| $43$ |
\( T^{4} \)
|
| $47$ |
\( (T^{2} + 413996)^{2} \)
|
| $53$ |
\( (T^{2} + 50864)^{2} \)
|
| $59$ |
\( T^{4} + \cdots + 97982146441 \)
|
| $61$ |
\( T^{4} \)
|
| $67$ |
\( (T^{2} - 416 T - 729233)^{2} \)
|
| $71$ |
\( T^{4} + 1090366 T^{2} + 276656689 \)
|
| $73$ |
\( T^{4} \)
|
| $79$ |
\( T^{4} \)
|
| $83$ |
\( T^{4} \)
|
| $89$ |
\( T^{4} + \cdots + 4398696652249 \)
|
| $97$ |
\( (T^{2} - 34 T - 2736863)^{2} \)
|
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