Newspace parameters
comment: Compute space of new eigenforms
[N,k,chi] = [126,7,Mod(71,126)]
mf = mfinit([N,k,chi],0)
lf = mfeigenbasis(mf)
from sage.modular.dirichlet import DirichletCharacter
H = DirichletGroup(126, 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("126.71");
S:= CuspForms(chi, 7);
N := Newforms(S);
| Level: | \( N \) | \(=\) | \( 126 = 2 \cdot 3^{2} \cdot 7 \) |
| Weight: | \( k \) | \(=\) | \( 7 \) |
| Character orbit: | \([\chi]\) | \(=\) | 126.b (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: | \(28.9868145361\) |
| 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: | \(\Z[a_1, \ldots, a_{11}]\) |
| Coefficient ring index: | \( 2 \) |
| 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
\( x^{4} + 8x^{2} + 9 \)
:
| \(\beta_{1}\) | \(=\) |
\( ( \nu^{3} + 5\nu ) / 3 \)
|
| \(\beta_{2}\) | \(=\) |
\( ( \nu^{3} + 11\nu ) / 3 \)
|
| \(\beta_{3}\) | \(=\) |
\( \nu^{2} + 4 \)
|
| \(\nu\) | \(=\) |
\( ( \beta_{2} - \beta_1 ) / 2 \)
|
| \(\nu^{2}\) | \(=\) |
\( \beta_{3} - 4 \)
|
| \(\nu^{3}\) | \(=\) |
\( ( -5\beta_{2} + 11\beta_1 ) / 2 \)
|
Character values
We give the values of \(\chi\) on generators for \(\left(\mathbb{Z}/126\mathbb{Z}\right)^\times\).
| \(n\) | \(29\) | \(73\) |
| \(\chi(n)\) | \(-1\) | \(1\) |
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 | \(\iota_m(\nu)\) | \( a_{2} \) | \( a_{3} \) | \( a_{4} \) | \( a_{5} \) | \( a_{6} \) | \( a_{7} \) | \( a_{8} \) | \( a_{9} \) | \( a_{10} \) | ||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 71.1 |
|
− | 5.65685i | 0 | −32.0000 | − | 58.1861i | 0 | 129.642 | 181.019i | 0 | −329.150 | ||||||||||||||||||||||||||||
| 71.2 | − | 5.65685i | 0 | −32.0000 | 128.897i | 0 | −129.642 | 181.019i | 0 | 729.150 | ||||||||||||||||||||||||||||||
| 71.3 | 5.65685i | 0 | −32.0000 | − | 128.897i | 0 | −129.642 | − | 181.019i | 0 | 729.150 | |||||||||||||||||||||||||||||
| 71.4 | 5.65685i | 0 | −32.0000 | 58.1861i | 0 | 129.642 | − | 181.019i | 0 | −329.150 | ||||||||||||||||||||||||||||||
Inner twists
| Char | Parity | Ord | Mult | Type |
|---|---|---|---|---|
| 1.a | even | 1 | 1 | trivial |
| 3.b | odd | 2 | 1 | inner |
Twists
| By twisting character orbit | |||||||
|---|---|---|---|---|---|---|---|
| Char | Parity | Ord | Mult | Type | Twist | Min | Dim |
| 1.a | even | 1 | 1 | trivial | 126.7.b.a | ✓ | 4 |
| 3.b | odd | 2 | 1 | inner | 126.7.b.a | ✓ | 4 |
| By twisted newform orbit | |||||||
|---|---|---|---|---|---|---|---|
| Twist | Min | Dim | Char | Parity | Ord | Mult | Type |
| 126.7.b.a | ✓ | 4 | 1.a | even | 1 | 1 | trivial |
| 126.7.b.a | ✓ | 4 | 3.b | odd | 2 | 1 | inner |
Hecke kernels
This newform subspace can be constructed as the kernel of the linear operator
\( T_{5}^{4} + 20000T_{5}^{2} + 56250000 \)
acting on \(S_{7}^{\mathrm{new}}(126, [\chi])\).
Hecke characteristic polynomials
| $p$ | $F_p(T)$ |
|---|---|
| $2$ |
\( (T^{2} + 32)^{2} \)
|
| $3$ |
\( T^{4} \)
|
| $5$ |
\( T^{4} + 20000 T^{2} + 56250000 \)
|
| $7$ |
\( (T^{2} - 16807)^{2} \)
|
| $11$ |
\( T^{4} + \cdots + 352714834404 \)
|
| $13$ |
\( (T^{2} + 2788 T + 932436)^{2} \)
|
| $17$ |
\( T^{4} + \cdots + 12742244058384 \)
|
| $19$ |
\( (T^{2} + 5300 T + 3453928)^{2} \)
|
| $23$ |
\( T^{4} + \cdots + 24\!\cdots\!16 \)
|
| $29$ |
\( T^{4} + \cdots + 98\!\cdots\!76 \)
|
| $31$ |
\( (T^{2} - 6932 T - 45967032)^{2} \)
|
| $37$ |
\( (T^{2} + 33968 T - 1667516336)^{2} \)
|
| $41$ |
\( T^{4} + \cdots + 24\!\cdots\!64 \)
|
| $43$ |
\( (T^{2} - 19192 T - 2803925984)^{2} \)
|
| $47$ |
\( T^{4} + \cdots + 20\!\cdots\!64 \)
|
| $53$ |
\( T^{4} + \cdots + 53\!\cdots\!76 \)
|
| $59$ |
\( T^{4} + \cdots + 41\!\cdots\!44 \)
|
| $61$ |
\( (T^{2} - 419960 T + 4693497012)^{2} \)
|
| $67$ |
\( (T^{2} + 446988 T - 63259455052)^{2} \)
|
| $71$ |
\( T^{4} + \cdots + 66\!\cdots\!24 \)
|
| $73$ |
\( (T^{2} + 387000 T + 35852515700)^{2} \)
|
| $79$ |
\( (T^{2} + 325900 T - 97434207708)^{2} \)
|
| $83$ |
\( T^{4} + \cdots + 49\!\cdots\!56 \)
|
| $89$ |
\( T^{4} + \cdots + 45\!\cdots\!04 \)
|
| $97$ |
\( (T^{2} + \cdots - 1993653320284)^{2} \)
|
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