Newspace parameters
comment: Compute space of new eigenforms
[N,k,chi] = [400,6,Mod(143,400)]
mf = mfinit([N,k,chi],0)
lf = mfeigenbasis(mf)
from sage.modular.dirichlet import DirichletCharacter
H = DirichletGroup(400, base_ring=CyclotomicField(4))
chi = DirichletCharacter(H, H._module([2, 0, 3]))
N = Newforms(chi, 6, names="a")
//Please install CHIMP (https://github.com/edgarcosta/CHIMP) if you want to run this code
chi := DirichletCharacter("400.143");
S:= CuspForms(chi, 6);
N := Newforms(S);
| Level: | \( N \) | \(=\) | \( 400 = 2^{4} \cdot 5^{2} \) |
| Weight: | \( k \) | \(=\) | \( 6 \) |
| Character orbit: | \([\chi]\) | \(=\) | 400.n (of order \(4\), degree \(2\), 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: | \(64.1535279252\) |
| Analytic rank: | \(0\) |
| Dimension: | \(4\) |
| Relative dimension: | \(2\) over \(\Q(i)\) |
| Coefficient field: | \(\Q(i, \sqrt{155})\) |
|
comment: defining polynomial
gp: f.mod \\ as an extension of the character field
|
|
| Defining polynomial: |
\( x^{4} - 77x^{2} + 1521 \)
|
| Coefficient ring: | \(\Z[a_1, \ldots, a_{9}]\) |
| Coefficient ring index: | \( 2^{3} \) |
| Twist minimal: | no (minimal twist has level 80) |
| Sato-Tate group: | $\mathrm{SU}(2)[C_{4}]$ |
$q$-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
\( x^{4} - 77x^{2} + 1521 \)
:
| \(\beta_{1}\) | \(=\) |
\( ( \nu^{3} - 38\nu ) / 39 \)
|
| \(\beta_{2}\) | \(=\) |
\( ( -\nu^{3} + 78\nu^{2} + 116\nu - 3003 ) / 39 \)
|
| \(\beta_{3}\) | \(=\) |
\( ( -\nu^{3} - 78\nu^{2} + 116\nu + 3003 ) / 39 \)
|
| \(\nu\) | \(=\) |
\( ( \beta_{3} + \beta_{2} + 2\beta_1 ) / 4 \)
|
| \(\nu^{2}\) | \(=\) |
\( ( -\beta_{3} + \beta_{2} + 154 ) / 4 \)
|
| \(\nu^{3}\) | \(=\) |
\( ( 19\beta_{3} + 19\beta_{2} + 116\beta_1 ) / 2 \)
|
Character values
We give the values of \(\chi\) on generators for \(\left(\mathbb{Z}/400\mathbb{Z}\right)^\times\).
| \(n\) | \(101\) | \(177\) | \(351\) |
| \(\chi(n)\) | \(1\) | \(\beta_{1}\) | \(-1\) |
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 | \(\iota_m(\nu)\) | \( a_{2} \) | \( a_{3} \) | \( a_{4} \) | \( a_{5} \) | \( a_{6} \) | \( a_{7} \) | \( a_{8} \) | \( a_{9} \) | \( a_{10} \) | ||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 143.1 |
|
0 | −12.4499 | + | 12.4499i | 0 | 0 | 0 | −136.949 | − | 136.949i | 0 | − | 67.0000i | 0 | |||||||||||||||||||||||||
| 143.2 | 0 | 12.4499 | − | 12.4499i | 0 | 0 | 0 | 136.949 | + | 136.949i | 0 | − | 67.0000i | 0 | ||||||||||||||||||||||||||
| 207.1 | 0 | −12.4499 | − | 12.4499i | 0 | 0 | 0 | −136.949 | + | 136.949i | 0 | 67.0000i | 0 | |||||||||||||||||||||||||||
| 207.2 | 0 | 12.4499 | + | 12.4499i | 0 | 0 | 0 | 136.949 | − | 136.949i | 0 | 67.0000i | 0 | |||||||||||||||||||||||||||
Inner twists
| Char | Parity | Ord | Mult | Type |
|---|---|---|---|---|
| 1.a | even | 1 | 1 | trivial |
| 4.b | odd | 2 | 1 | inner |
| 5.c | odd | 4 | 1 | inner |
| 20.e | even | 4 | 1 | inner |
Twists
| By twisting character orbit | |||||||
|---|---|---|---|---|---|---|---|
| Char | Parity | Ord | Mult | Type | Twist | Min | Dim |
| 1.a | even | 1 | 1 | trivial | 400.6.n.b | 4 | |
| 4.b | odd | 2 | 1 | inner | 400.6.n.b | 4 | |
| 5.b | even | 2 | 1 | 80.6.n.c | ✓ | 4 | |
| 5.c | odd | 4 | 1 | 80.6.n.c | ✓ | 4 | |
| 5.c | odd | 4 | 1 | inner | 400.6.n.b | 4 | |
| 20.d | odd | 2 | 1 | 80.6.n.c | ✓ | 4 | |
| 20.e | even | 4 | 1 | 80.6.n.c | ✓ | 4 | |
| 20.e | even | 4 | 1 | inner | 400.6.n.b | 4 | |
| By twisted newform orbit | |||||||
|---|---|---|---|---|---|---|---|
| Twist | Min | Dim | Char | Parity | Ord | Mult | Type |
| 80.6.n.c | ✓ | 4 | 5.b | even | 2 | 1 | |
| 80.6.n.c | ✓ | 4 | 5.c | odd | 4 | 1 | |
| 80.6.n.c | ✓ | 4 | 20.d | odd | 2 | 1 | |
| 80.6.n.c | ✓ | 4 | 20.e | even | 4 | 1 | |
| 400.6.n.b | 4 | 1.a | even | 1 | 1 | trivial | |
| 400.6.n.b | 4 | 4.b | odd | 2 | 1 | inner | |
| 400.6.n.b | 4 | 5.c | odd | 4 | 1 | inner | |
| 400.6.n.b | 4 | 20.e | even | 4 | 1 | inner | |
Hecke kernels
This newform subspace can be constructed as the kernel of the linear operator
\( T_{3}^{4} + 96100 \)
acting on \(S_{6}^{\mathrm{new}}(400, [\chi])\).
Hecke characteristic polynomials
| $p$ | $F_p(T)$ |
|---|---|
| $2$ |
\( T^{4} \)
|
| $3$ |
\( T^{4} + 96100 \)
|
| $5$ |
\( T^{4} \)
|
| $7$ |
\( T^{4} + 1407000100 \)
|
| $11$ |
\( (T^{2} + 15500)^{2} \)
|
| $13$ |
\( (T^{2} + 330 T + 54450)^{2} \)
|
| $17$ |
\( (T^{2} + 2530 T + 3200450)^{2} \)
|
| $19$ |
\( (T^{2} - 7502000)^{2} \)
|
| $23$ |
\( T^{4} + 328546776100 \)
|
| $29$ |
\( (T^{2} + 6739216)^{2} \)
|
| $31$ |
\( (T^{2} + 50359500)^{2} \)
|
| $37$ |
\( (T^{2} + 2770 T + 3836450)^{2} \)
|
| $41$ |
\( (T - 2178)^{4} \)
|
| $43$ |
\( T^{4} + 14\!\cdots\!00 \)
|
| $47$ |
\( T^{4} + 23\!\cdots\!00 \)
|
| $53$ |
\( (T^{2} - 47830 T + 1143854450)^{2} \)
|
| $59$ |
\( (T^{2} - 736622000)^{2} \)
|
| $61$ |
\( (T + 35882)^{4} \)
|
| $67$ |
\( T^{4} + 20\!\cdots\!00 \)
|
| $71$ |
\( (T^{2} + 4503075500)^{2} \)
|
| $73$ |
\( (T^{2} - 43230 T + 934416450)^{2} \)
|
| $79$ |
\( (T^{2} - 480128000)^{2} \)
|
| $83$ |
\( T^{4} + 90\!\cdots\!00 \)
|
| $89$ |
\( (T^{2} + 13092851776)^{2} \)
|
| $97$ |
\( (T^{2} - 1230 T + 756450)^{2} \)
|
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