Newspace parameters
comment: Compute space of new eigenforms
[N,k,chi] = [381,1,Mod(2,381)]
mf = mfinit([N,k,chi],0)
lf = mfeigenbasis(mf)
from sage.modular.dirichlet import DirichletCharacter
H = DirichletGroup(381, base_ring=CyclotomicField(14))
chi = DirichletCharacter(H, H._module([7, 8]))
N = Newforms(chi, 1, names="a")
//Please install CHIMP (https://github.com/edgarcosta/CHIMP) if you want to run this code
chi := DirichletCharacter("381.2");
S:= CuspForms(chi, 1);
N := Newforms(S);
| Level: | \( N \) | \(=\) | \( 381 = 3 \cdot 127 \) |
| Weight: | \( k \) | \(=\) | \( 1 \) |
| Character orbit: | \([\chi]\) | \(=\) | 381.m (of order \(14\), degree \(6\), 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: | \(0.190143769813\) |
| Analytic rank: | \(0\) |
| Dimension: | \(6\) |
| Coefficient field: | \(\Q(\zeta_{14})\) |
|
comment: defining polynomial
gp: f.mod \\ as an extension of the character field
|
|
| Defining polynomial: |
\( x^{6} - x^{5} + x^{4} - x^{3} + x^{2} - x + 1 \)
|
| Coefficient ring: | \(\Z[a_1, a_2, a_3]\) |
| Coefficient ring index: | \( 1 \) |
| Twist minimal: | yes |
| Projective image: | \(D_{7}\) |
| Projective field: | Galois closure of 7.1.113288568696603.1 |
$q$-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 \(\left(\mathbb{Z}/381\mathbb{Z}\right)^\times\).
| \(n\) | \(128\) | \(130\) |
| \(\chi(n)\) | \(-1\) | \(-\zeta_{14}^{5}\) |
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 | \(\iota_m(\nu)\) | \( a_{2} \) | \( a_{3} \) | \( a_{4} \) | \( a_{5} \) | \( a_{6} \) | \( a_{7} \) | \( a_{8} \) | \( a_{9} \) | \( a_{10} \) | ||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2.1 |
|
0 | −0.222521 | + | 0.974928i | 0.623490 | + | 0.781831i | 0 | 0 | 0.777479 | − | 0.974928i | 0 | −0.900969 | − | 0.433884i | 0 | ||||||||||||||||||||||||||||
| 8.1 | 0 | 0.623490 | − | 0.781831i | −0.900969 | + | 0.433884i | 0 | 0 | 1.62349 | + | 0.781831i | 0 | −0.222521 | − | 0.974928i | 0 | |||||||||||||||||||||||||||||
| 32.1 | 0 | −0.900969 | + | 0.433884i | −0.222521 | − | 0.974928i | 0 | 0 | 0.0990311 | − | 0.433884i | 0 | 0.623490 | − | 0.781831i | 0 | |||||||||||||||||||||||||||||
| 131.1 | 0 | −0.900969 | − | 0.433884i | −0.222521 | + | 0.974928i | 0 | 0 | 0.0990311 | + | 0.433884i | 0 | 0.623490 | + | 0.781831i | 0 | |||||||||||||||||||||||||||||
| 143.1 | 0 | 0.623490 | + | 0.781831i | −0.900969 | − | 0.433884i | 0 | 0 | 1.62349 | − | 0.781831i | 0 | −0.222521 | + | 0.974928i | 0 | |||||||||||||||||||||||||||||
| 191.1 | 0 | −0.222521 | − | 0.974928i | 0.623490 | − | 0.781831i | 0 | 0 | 0.777479 | + | 0.974928i | 0 | −0.900969 | + | 0.433884i | 0 | |||||||||||||||||||||||||||||
Inner twists
| Char | Parity | Ord | Mult | Type |
|---|---|---|---|---|
| 1.a | even | 1 | 1 | trivial |
| 3.b | odd | 2 | 1 | CM by \(\Q(\sqrt{-3}) \) |
| 127.e | even | 7 | 1 | inner |
| 381.m | odd | 14 | 1 | inner |
Twists
| By twisting character orbit | |||||||
|---|---|---|---|---|---|---|---|
| Char | Parity | Ord | Mult | Type | Twist | Min | Dim |
| 1.a | even | 1 | 1 | trivial | 381.1.m.a | ✓ | 6 |
| 3.b | odd | 2 | 1 | CM | 381.1.m.a | ✓ | 6 |
| 127.e | even | 7 | 1 | inner | 381.1.m.a | ✓ | 6 |
| 381.m | odd | 14 | 1 | inner | 381.1.m.a | ✓ | 6 |
| By twisted newform orbit | |||||||
|---|---|---|---|---|---|---|---|
| Twist | Min | Dim | Char | Parity | Ord | Mult | Type |
| 381.1.m.a | ✓ | 6 | 1.a | even | 1 | 1 | trivial |
| 381.1.m.a | ✓ | 6 | 3.b | odd | 2 | 1 | CM |
| 381.1.m.a | ✓ | 6 | 127.e | even | 7 | 1 | inner |
| 381.1.m.a | ✓ | 6 | 381.m | odd | 14 | 1 | inner |
Hecke kernels
This newform subspace is the entire newspace \(S_{1}^{\mathrm{new}}(381, [\chi])\).
Hecke characteristic polynomials
| $p$ | $F_p(T)$ |
|---|---|
| $2$ |
\( T^{6} \)
|
| $3$ |
\( T^{6} + T^{5} + T^{4} + \cdots + 1 \)
|
| $5$ |
\( T^{6} \)
|
| $7$ |
\( T^{6} - 5 T^{5} + \cdots + 1 \)
|
| $11$ |
\( T^{6} \)
|
| $13$ |
\( T^{6} + 2 T^{5} + \cdots + 1 \)
|
| $17$ |
\( T^{6} \)
|
| $19$ |
\( (T^{3} + T^{2} - 2 T - 1)^{2} \)
|
| $23$ |
\( T^{6} \)
|
| $29$ |
\( T^{6} \)
|
| $31$ |
\( T^{6} + 2 T^{5} + \cdots + 1 \)
|
| $37$ |
\( (T^{3} + T^{2} - 2 T - 1)^{2} \)
|
| $41$ |
\( T^{6} \)
|
| $43$ |
\( T^{6} + 2 T^{5} + \cdots + 1 \)
|
| $47$ |
\( T^{6} \)
|
| $53$ |
\( T^{6} \)
|
| $59$ |
\( T^{6} \)
|
| $61$ |
\( T^{6} + 2 T^{5} + \cdots + 1 \)
|
| $67$ |
\( T^{6} + 2 T^{5} + \cdots + 64 \)
|
| $71$ |
\( T^{6} \)
|
| $73$ |
\( T^{6} - 5 T^{5} + \cdots + 1 \)
|
| $79$ |
\( T^{6} + 2 T^{5} + \cdots + 64 \)
|
| $83$ |
\( T^{6} \)
|
| $89$ |
\( T^{6} \)
|
| $97$ |
\( T^{6} - 5 T^{5} + \cdots + 1 \)
|
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