Newspace parameters
comment: Compute space of new eigenforms
[N,k,chi] = [16,7,Mod(15,16)]
mf = mfinit([N,k,chi],0)
lf = mfeigenbasis(mf)
from sage.modular.dirichlet import DirichletCharacter
H = DirichletGroup(16, base_ring=CyclotomicField(2))
chi = DirichletCharacter(H, H._module([1, 0]))
N = Newforms(chi, 7, names="a")
//Please install CHIMP (https://github.com/edgarcosta/CHIMP) if you want to run this code
chi := DirichletCharacter("16.15");
S:= CuspForms(chi, 7);
N := Newforms(S);
| Level: | \( N \) | \(=\) | \( 16 = 2^{4} \) |
| Weight: | \( k \) | \(=\) | \( 7 \) |
| Character orbit: | \([\chi]\) | \(=\) | 16.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: | \(3.68086533792\) |
| Analytic rank: | \(0\) |
| Dimension: | \(2\) |
| Coefficient field: | \(\Q(\sqrt{-3}) \) |
|
comment: defining polynomial
gp: f.mod \\ as an extension of the character field
|
|
| Defining polynomial: |
\( x^{2} - x + 1 \)
|
| Coefficient ring: | \(\Z[a_1, a_2, a_3]\) |
| Coefficient ring index: | \( 2^{5} \) |
| 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 \(\beta = 16\sqrt{-3}\). We also show the integral \(q\)-expansion of the trace form.
Character values
We give the values of \(\chi\) on generators for \(\left(\mathbb{Z}/16\mathbb{Z}\right)^\times\).
| \(n\) | \(5\) | \(15\) |
| \(\chi(n)\) | \(1\) | \(-1\) |
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 | \(\iota_m(\nu)\) | \( a_{2} \) | \( a_{3} \) | \( a_{4} \) | \( a_{5} \) | \( a_{6} \) | \( a_{7} \) | \( a_{8} \) | \( a_{9} \) | \( a_{10} \) | ||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 15.1 |
|
0 | − | 27.7128i | 0 | −150.000 | 0 | − | 609.682i | 0 | −39.0000 | 0 | ||||||||||||||||||||||
| 15.2 | 0 | 27.7128i | 0 | −150.000 | 0 | 609.682i | 0 | −39.0000 | 0 | |||||||||||||||||||||||||
Inner twists
| Char | Parity | Ord | Mult | Type |
|---|---|---|---|---|
| 1.a | even | 1 | 1 | trivial |
| 4.b | odd | 2 | 1 | inner |
Twists
| By twisting character orbit | |||||||
|---|---|---|---|---|---|---|---|
| Char | Parity | Ord | Mult | Type | Twist | Min | Dim |
| 1.a | even | 1 | 1 | trivial | 16.7.c.b | ✓ | 2 |
| 3.b | odd | 2 | 1 | 144.7.g.f | 2 | ||
| 4.b | odd | 2 | 1 | inner | 16.7.c.b | ✓ | 2 |
| 5.b | even | 2 | 1 | 400.7.b.c | 2 | ||
| 5.c | odd | 4 | 2 | 400.7.h.b | 4 | ||
| 8.b | even | 2 | 1 | 64.7.c.d | 2 | ||
| 8.d | odd | 2 | 1 | 64.7.c.d | 2 | ||
| 12.b | even | 2 | 1 | 144.7.g.f | 2 | ||
| 16.e | even | 4 | 2 | 256.7.d.e | 4 | ||
| 16.f | odd | 4 | 2 | 256.7.d.e | 4 | ||
| 20.d | odd | 2 | 1 | 400.7.b.c | 2 | ||
| 20.e | even | 4 | 2 | 400.7.h.b | 4 | ||
| 24.f | even | 2 | 1 | 576.7.g.d | 2 | ||
| 24.h | odd | 2 | 1 | 576.7.g.d | 2 | ||
| By twisted newform orbit | |||||||
|---|---|---|---|---|---|---|---|
| Twist | Min | Dim | Char | Parity | Ord | Mult | Type |
| 16.7.c.b | ✓ | 2 | 1.a | even | 1 | 1 | trivial |
| 16.7.c.b | ✓ | 2 | 4.b | odd | 2 | 1 | inner |
| 64.7.c.d | 2 | 8.b | even | 2 | 1 | ||
| 64.7.c.d | 2 | 8.d | odd | 2 | 1 | ||
| 144.7.g.f | 2 | 3.b | odd | 2 | 1 | ||
| 144.7.g.f | 2 | 12.b | even | 2 | 1 | ||
| 256.7.d.e | 4 | 16.e | even | 4 | 2 | ||
| 256.7.d.e | 4 | 16.f | odd | 4 | 2 | ||
| 400.7.b.c | 2 | 5.b | even | 2 | 1 | ||
| 400.7.b.c | 2 | 20.d | odd | 2 | 1 | ||
| 400.7.h.b | 4 | 5.c | odd | 4 | 2 | ||
| 400.7.h.b | 4 | 20.e | even | 4 | 2 | ||
| 576.7.g.d | 2 | 24.f | even | 2 | 1 | ||
| 576.7.g.d | 2 | 24.h | odd | 2 | 1 | ||
Hecke kernels
This newform subspace can be constructed as the kernel of the linear operator
\( T_{3}^{2} + 768 \)
acting on \(S_{7}^{\mathrm{new}}(16, [\chi])\).
Hecke characteristic polynomials
| $p$ | $F_p(T)$ |
|---|---|
| $2$ |
\( T^{2} \)
|
| $3$ |
\( T^{2} + 768 \)
|
| $5$ |
\( (T + 150)^{2} \)
|
| $7$ |
\( T^{2} + 371712 \)
|
| $11$ |
\( T^{2} + 836352 \)
|
| $13$ |
\( (T - 154)^{2} \)
|
| $17$ |
\( (T - 7458)^{2} \)
|
| $19$ |
\( T^{2} + 4553472 \)
|
| $23$ |
\( T^{2} + 71912448 \)
|
| $29$ |
\( (T + 10758)^{2} \)
|
| $31$ |
\( T^{2} + 3981312 \)
|
| $37$ |
\( (T + 11350)^{2} \)
|
| $41$ |
\( (T - 67122)^{2} \)
|
| $43$ |
\( T^{2} + 6330348288 \)
|
| $47$ |
\( T^{2} + 4830769152 \)
|
| $53$ |
\( (T - 109962)^{2} \)
|
| $59$ |
\( T^{2} + 93554203392 \)
|
| $61$ |
\( (T - 306746)^{2} \)
|
| $67$ |
\( T^{2} + 48551731968 \)
|
| $71$ |
\( T^{2} + 138602769408 \)
|
| $73$ |
\( (T - 165682)^{2} \)
|
| $79$ |
\( T^{2} + 580800000000 \)
|
| $83$ |
\( T^{2} + 244784339712 \)
|
| $89$ |
\( (T - 471954)^{2} \)
|
| $97$ |
\( (T - 910594)^{2} \)
|
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