Newspace parameters
comment: Compute space of new eigenforms
[N,k,chi] = [799,1,Mod(140,799)]
mf = mfinit([N,k,chi],0)
lf = mfeigenbasis(mf)
from sage.modular.dirichlet import DirichletCharacter
H = DirichletGroup(799, base_ring=CyclotomicField(4))
chi = DirichletCharacter(H, H._module([3, 2]))
N = Newforms(chi, 1, names="a")
//Please install CHIMP (https://github.com/edgarcosta/CHIMP) if you want to run this code
chi := DirichletCharacter("799.140");
S:= CuspForms(chi, 1);
N := Newforms(S);
| Level: | \( N \) | \(=\) | \( 799 = 17 \cdot 47 \) |
| Weight: | \( k \) | \(=\) | \( 1 \) |
| Character orbit: | \([\chi]\) | \(=\) | 799.e (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: | \(0.398752945094\) |
| Analytic rank: | \(0\) |
| Dimension: | \(8\) |
| Relative dimension: | \(4\) over \(\Q(i)\) |
| Coefficient field: | \(\Q(\zeta_{20})\) |
|
comment: defining polynomial
gp: f.mod \\ as an extension of the character field
|
|
| Defining polynomial: |
\( x^{8} - x^{6} + x^{4} - x^{2} + 1 \)
|
| Coefficient ring: | \(\Z[a_1, \ldots, a_{17}]\) |
| Coefficient ring index: | \( 1 \) |
| Twist minimal: | yes |
| Projective image: | \(D_{20}\) |
| Projective field: | Galois closure of \(\mathbb{Q}[x]/(x^{20} - \cdots)\) |
$q$-expansion
comment: q-expansion
sage: f.q_expansion() # note that sage often uses an isomorphic number field
gp: mfcoefs(f, 20)
The \(q\)-expansion and trace form are shown below.
Character values
We give the values of \(\chi\) on generators for \(\left(\mathbb{Z}/799\mathbb{Z}\right)^\times\).
| \(n\) | \(52\) | \(377\) |
| \(\chi(n)\) | \(-1\) | \(-\zeta_{20}^{5}\) |
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 | \(\iota_m(\nu)\) | \( a_{2} \) | \( a_{3} \) | \( a_{4} \) | \( a_{5} \) | \( a_{6} \) | \( a_{7} \) | \( a_{8} \) | \( a_{9} \) | \( a_{10} \) | ||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 140.1 |
|
− | 0.618034i | −1.39680 | + | 1.39680i | 0.618034 | 0 | 0.863271 | + | 0.863271i | −1.26007 | − | 1.26007i | − | 1.00000i | − | 2.90211i | 0 | |||||||||||||||||||||||||||||||||
| 140.2 | − | 0.618034i | −0.221232 | + | 0.221232i | 0.618034 | 0 | 0.136729 | + | 0.136729i | 0.642040 | + | 0.642040i | − | 1.00000i | 0.902113i | 0 | |||||||||||||||||||||||||||||||||||
| 140.3 | 1.61803i | −0.642040 | + | 0.642040i | −1.61803 | 0 | −1.03884 | − | 1.03884i | 1.39680 | + | 1.39680i | − | 1.00000i | 0.175571i | 0 | ||||||||||||||||||||||||||||||||||||
| 140.4 | 1.61803i | 1.26007 | − | 1.26007i | −1.61803 | 0 | 2.03884 | + | 2.03884i | 0.221232 | + | 0.221232i | − | 1.00000i | − | 2.17557i | 0 | |||||||||||||||||||||||||||||||||||
| 234.1 | − | 1.61803i | −0.642040 | − | 0.642040i | −1.61803 | 0 | −1.03884 | + | 1.03884i | 1.39680 | − | 1.39680i | 1.00000i | − | 0.175571i | 0 | |||||||||||||||||||||||||||||||||||
| 234.2 | − | 1.61803i | 1.26007 | + | 1.26007i | −1.61803 | 0 | 2.03884 | − | 2.03884i | 0.221232 | − | 0.221232i | 1.00000i | 2.17557i | 0 | ||||||||||||||||||||||||||||||||||||
| 234.3 | 0.618034i | −1.39680 | − | 1.39680i | 0.618034 | 0 | 0.863271 | − | 0.863271i | −1.26007 | + | 1.26007i | 1.00000i | 2.90211i | 0 | |||||||||||||||||||||||||||||||||||||
| 234.4 | 0.618034i | −0.221232 | − | 0.221232i | 0.618034 | 0 | 0.136729 | − | 0.136729i | 0.642040 | − | 0.642040i | 1.00000i | − | 0.902113i | 0 | ||||||||||||||||||||||||||||||||||||
Inner twists
| Char | Parity | Ord | Mult | Type |
|---|---|---|---|---|
| 1.a | even | 1 | 1 | trivial |
| 47.b | odd | 2 | 1 | CM by \(\Q(\sqrt{-47}) \) |
| 17.c | even | 4 | 1 | inner |
| 799.e | odd | 4 | 1 | inner |
Twists
| By twisting character orbit | |||||||
|---|---|---|---|---|---|---|---|
| Char | Parity | Ord | Mult | Type | Twist | Min | Dim |
| 1.a | even | 1 | 1 | trivial | 799.1.e.b | ✓ | 8 |
| 17.c | even | 4 | 1 | inner | 799.1.e.b | ✓ | 8 |
| 47.b | odd | 2 | 1 | CM | 799.1.e.b | ✓ | 8 |
| 799.e | odd | 4 | 1 | inner | 799.1.e.b | ✓ | 8 |
| By twisted newform orbit | |||||||
|---|---|---|---|---|---|---|---|
| Twist | Min | Dim | Char | Parity | Ord | Mult | Type |
| 799.1.e.b | ✓ | 8 | 1.a | even | 1 | 1 | trivial |
| 799.1.e.b | ✓ | 8 | 17.c | even | 4 | 1 | inner |
| 799.1.e.b | ✓ | 8 | 47.b | odd | 2 | 1 | CM |
| 799.1.e.b | ✓ | 8 | 799.e | odd | 4 | 1 | inner |
Hecke kernels
This newform subspace can be constructed as the kernel of the linear operator
\( T_{2}^{4} + 3T_{2}^{2} + 1 \)
acting on \(S_{1}^{\mathrm{new}}(799, [\chi])\).
Hecke characteristic polynomials
| $p$ | $F_p(T)$ |
|---|---|
| $2$ |
\( (T^{4} + 3 T^{2} + 1)^{2} \)
|
| $3$ |
\( T^{8} + 2 T^{7} + \cdots + 1 \)
|
| $5$ |
\( T^{8} \)
|
| $7$ |
\( T^{8} - 2 T^{7} + \cdots + 1 \)
|
| $11$ |
\( T^{8} \)
|
| $13$ |
\( T^{8} \)
|
| $17$ |
\( (T^{4} + T^{3} + T^{2} + \cdots + 1)^{2} \)
|
| $19$ |
\( T^{8} \)
|
| $23$ |
\( T^{8} \)
|
| $29$ |
\( T^{8} \)
|
| $31$ |
\( T^{8} \)
|
| $37$ |
\( T^{8} - 2 T^{7} + \cdots + 1 \)
|
| $41$ |
\( T^{8} \)
|
| $43$ |
\( T^{8} \)
|
| $47$ |
\( (T + 1)^{8} \)
|
| $53$ |
\( (T^{4} + 5 T^{2} + 5)^{2} \)
|
| $59$ |
\( (T^{4} + 3 T^{2} + 1)^{2} \)
|
| $61$ |
\( T^{8} + 2 T^{7} + \cdots + 1 \)
|
| $67$ |
\( T^{8} \)
|
| $71$ |
\( T^{8} + 2 T^{7} + \cdots + 1 \)
|
| $73$ |
\( T^{8} \)
|
| $79$ |
\( T^{8} + 2 T^{7} + \cdots + 1 \)
|
| $83$ |
\( T^{8} \)
|
| $89$ |
\( (T^{2} + T - 1)^{4} \)
|
| $97$ |
\( T^{8} - 2 T^{7} + \cdots + 1 \)
|
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