Newspace parameters
comment: Compute space of new eigenforms
[N,k,chi] = [512,5,Mod(511,512)]
mf = mfinit([N,k,chi],0)
lf = mfeigenbasis(mf)
from sage.modular.dirichlet import DirichletCharacter
H = DirichletGroup(512, base_ring=CyclotomicField(2))
chi = DirichletCharacter(H, H._module([1, 0]))
N = Newforms(chi, 5, names="a")
//Please install CHIMP (https://github.com/edgarcosta/CHIMP) if you want to run this code
chi := DirichletCharacter("512.511");
S:= CuspForms(chi, 5);
N := Newforms(S);
| Level: | \( N \) | \(=\) | \( 512 = 2^{9} \) |
| Weight: | \( k \) | \(=\) | \( 5 \) |
| Character orbit: | \([\chi]\) | \(=\) | 512.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: | \(52.9254210989\) |
| Analytic rank: | \(0\) |
| Dimension: | \(4\) |
| Coefficient field: | \(\Q(\sqrt{-2}, \sqrt{7})\) |
|
comment: defining polynomial
gp: f.mod \\ as an extension of the character field
|
|
| Defining polynomial: |
\( x^{4} + 8x^{2} + 9 \)
|
| Coefficient ring: | \(\Z[a_1, \ldots, a_{7}]\) |
| Coefficient ring index: | \( 2^{9} \) |
| Twist minimal: | yes |
| 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
\( x^{4} + 8x^{2} + 9 \)
:
| \(\beta_{1}\) | \(=\) |
\( ( \nu^{3} + 5\nu ) / 3 \)
|
| \(\beta_{2}\) | \(=\) |
\( ( 16\nu^{3} + 176\nu ) / 3 \)
|
| \(\beta_{3}\) | \(=\) |
\( 16\nu^{2} + 64 \)
|
| \(\nu\) | \(=\) |
\( ( \beta_{2} - 16\beta_1 ) / 32 \)
|
| \(\nu^{2}\) | \(=\) |
\( ( \beta_{3} - 64 ) / 16 \)
|
| \(\nu^{3}\) | \(=\) |
\( ( -5\beta_{2} + 176\beta_1 ) / 32 \)
|
Character values
We give the values of \(\chi\) on generators for \(\left(\mathbb{Z}/512\mathbb{Z}\right)^\times\).
| \(n\) | \(5\) | \(511\) |
| \(\chi(n)\) | \(1\) | \(-1\) |
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 | \(\iota_m(\nu)\) | \( a_{2} \) | \( a_{3} \) | \( a_{4} \) | \( a_{5} \) | \( a_{6} \) | \( a_{7} \) | \( a_{8} \) | \( a_{9} \) | \( a_{10} \) | ||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 511.1 |
|
0 | − | 12.7279i | 0 | −42.3320 | 0 | 59.8665i | 0 | −81.0000 | 0 | |||||||||||||||||||||||||||||
| 511.2 | 0 | − | 12.7279i | 0 | 42.3320 | 0 | − | 59.8665i | 0 | −81.0000 | 0 | |||||||||||||||||||||||||||||
| 511.3 | 0 | 12.7279i | 0 | −42.3320 | 0 | − | 59.8665i | 0 | −81.0000 | 0 | ||||||||||||||||||||||||||||||
| 511.4 | 0 | 12.7279i | 0 | 42.3320 | 0 | 59.8665i | 0 | −81.0000 | 0 | |||||||||||||||||||||||||||||||
Inner twists
| Char | Parity | Ord | Mult | Type |
|---|---|---|---|---|
| 1.a | even | 1 | 1 | trivial |
| 4.b | odd | 2 | 1 | inner |
| 8.b | even | 2 | 1 | inner |
| 8.d | odd | 2 | 1 | inner |
Twists
| By twisting character orbit | |||||||
|---|---|---|---|---|---|---|---|
| Char | Parity | Ord | Mult | Type | Twist | Min | Dim |
| 1.a | even | 1 | 1 | trivial | 512.5.c.c | ✓ | 4 |
| 4.b | odd | 2 | 1 | inner | 512.5.c.c | ✓ | 4 |
| 8.b | even | 2 | 1 | inner | 512.5.c.c | ✓ | 4 |
| 8.d | odd | 2 | 1 | inner | 512.5.c.c | ✓ | 4 |
| 16.e | even | 4 | 2 | 512.5.d.c | 4 | ||
| 16.f | odd | 4 | 2 | 512.5.d.c | 4 | ||
| By twisted newform orbit | |||||||
|---|---|---|---|---|---|---|---|
| Twist | Min | Dim | Char | Parity | Ord | Mult | Type |
| 512.5.c.c | ✓ | 4 | 1.a | even | 1 | 1 | trivial |
| 512.5.c.c | ✓ | 4 | 4.b | odd | 2 | 1 | inner |
| 512.5.c.c | ✓ | 4 | 8.b | even | 2 | 1 | inner |
| 512.5.c.c | ✓ | 4 | 8.d | odd | 2 | 1 | inner |
| 512.5.d.c | 4 | 16.e | even | 4 | 2 | ||
| 512.5.d.c | 4 | 16.f | odd | 4 | 2 | ||
Hecke kernels
This newform subspace can be constructed as the intersection of the kernels of the following linear operators acting on \(S_{5}^{\mathrm{new}}(512, [\chi])\):
|
\( T_{3}^{2} + 162 \)
|
|
\( T_{5}^{2} - 1792 \)
|
Hecke characteristic polynomials
| $p$ | $F_p(T)$ |
|---|---|
| $2$ |
\( T^{4} \)
|
| $3$ |
\( (T^{2} + 162)^{2} \)
|
| $5$ |
\( (T^{2} - 1792)^{2} \)
|
| $7$ |
\( (T^{2} + 3584)^{2} \)
|
| $11$ |
\( (T^{2} + 36450)^{2} \)
|
| $13$ |
\( (T^{2} - 87808)^{2} \)
|
| $17$ |
\( (T - 256)^{4} \)
|
| $19$ |
\( (T^{2} + 45602)^{2} \)
|
| $23$ |
\( (T^{2} + 32256)^{2} \)
|
| $29$ |
\( (T^{2} - 1120000)^{2} \)
|
| $31$ |
\( (T^{2} + 14336)^{2} \)
|
| $37$ |
\( (T^{2} - 216832)^{2} \)
|
| $41$ |
\( (T - 546)^{4} \)
|
| $43$ |
\( (T^{2} + 1361250)^{2} \)
|
| $47$ |
\( (T^{2} + 1433600)^{2} \)
|
| $53$ |
\( (T^{2} - 216832)^{2} \)
|
| $59$ |
\( (T^{2} + 5705442)^{2} \)
|
| $61$ |
\( (T^{2} - 21290752)^{2} \)
|
| $67$ |
\( (T^{2} + 1573538)^{2} \)
|
| $71$ |
\( (T^{2} + 25894400)^{2} \)
|
| $73$ |
\( (T + 8704)^{4} \)
|
| $79$ |
\( (T^{2} + 10450944)^{2} \)
|
| $83$ |
\( (T^{2} + 19158050)^{2} \)
|
| $89$ |
\( (T - 512)^{4} \)
|
| $97$ |
\( (T - 768)^{4} \)
|
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