Newspace parameters
comment: Compute space of new eigenforms
[N,k,chi] = [2883,1,Mod(338,2883)]
mf = mfinit([N,k,chi],0)
lf = mfeigenbasis(mf)
from sage.modular.dirichlet import DirichletCharacter
H = DirichletGroup(2883, base_ring=CyclotomicField(30))
chi = DirichletCharacter(H, H._module([15, 16]))
N = Newforms(chi, 1, names="a")
//Please install CHIMP (https://github.com/edgarcosta/CHIMP) if you want to run this code
chi := DirichletCharacter("2883.338");
S:= CuspForms(chi, 1);
N := Newforms(S);
| Level: | \( N \) | \(=\) | \( 2883 = 3 \cdot 31^{2} \) |
| Weight: | \( k \) | \(=\) | \( 1 \) |
| Character orbit: | \([\chi]\) | \(=\) | 2883.o (of order \(30\), degree \(8\), not 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: | \(1.43880443142\) |
| Analytic rank: | \(0\) |
| Dimension: | \(8\) |
| Coefficient field: | \(\Q(\zeta_{15})\) |
|
comment: defining polynomial
gp: f.mod \\ as an extension of the character field
|
|
| Defining polynomial: |
\( x^{8} - x^{7} + x^{5} - x^{4} + x^{3} - x + 1 \)
|
| Coefficient ring: | \(\Z[a_1, a_2, a_3]\) |
| Coefficient ring index: | \( 1 \) |
| Twist minimal: | no (minimal twist has level 93) |
| Projective image: | \(D_{5}\) |
| Projective field: | Galois closure of 5.1.8311689.1 |
$q$-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 \(\left(\mathbb{Z}/2883\mathbb{Z}\right)^\times\).
| \(n\) | \(962\) | \(964\) |
| \(\chi(n)\) | \(-1\) | \(\zeta_{30}^{4}\) |
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 | \(\iota_m(\nu)\) | \( a_{2} \) | \( a_{3} \) | \( a_{4} \) | \( a_{5} \) | \( a_{6} \) | \( a_{7} \) | \( a_{8} \) | \( a_{9} \) | \( a_{10} \) | ||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 338.1 |
|
0 | 0.104528 | − | 0.994522i | 0.309017 | − | 0.951057i | 0 | 0 | 1.58268 | − | 0.336408i | 0 | −0.978148 | − | 0.207912i | 0 | ||||||||||||||||||||||||||||||||||
| 1196.1 | 0 | −0.913545 | + | 0.406737i | 0.309017 | − | 0.951057i | 0 | 0 | −1.08268 | − | 1.20243i | 0 | 0.669131 | − | 0.743145i | 0 | |||||||||||||||||||||||||||||||||||
| 1409.1 | 0 | −0.669131 | + | 0.743145i | −0.809017 | − | 0.587785i | 0 | 0 | −0.0646021 | + | 0.614648i | 0 | −0.104528 | − | 0.994522i | 0 | |||||||||||||||||||||||||||||||||||
| 1508.1 | 0 | −0.669131 | − | 0.743145i | −0.809017 | + | 0.587785i | 0 | 0 | −0.0646021 | − | 0.614648i | 0 | −0.104528 | + | 0.994522i | 0 | |||||||||||||||||||||||||||||||||||
| 1805.1 | 0 | 0.978148 | − | 0.207912i | −0.809017 | + | 0.587785i | 0 | 0 | 0.564602 | + | 0.251377i | 0 | 0.913545 | − | 0.406737i | 0 | |||||||||||||||||||||||||||||||||||
| 2654.1 | 0 | −0.913545 | − | 0.406737i | 0.309017 | + | 0.951057i | 0 | 0 | −1.08268 | + | 1.20243i | 0 | 0.669131 | + | 0.743145i | 0 | |||||||||||||||||||||||||||||||||||
| 2738.1 | 0 | 0.104528 | + | 0.994522i | 0.309017 | + | 0.951057i | 0 | 0 | 1.58268 | + | 0.336408i | 0 | −0.978148 | + | 0.207912i | 0 | |||||||||||||||||||||||||||||||||||
| 2768.1 | 0 | 0.978148 | + | 0.207912i | −0.809017 | − | 0.587785i | 0 | 0 | 0.564602 | − | 0.251377i | 0 | 0.913545 | + | 0.406737i | 0 | |||||||||||||||||||||||||||||||||||
Inner twists
| Char | Parity | Ord | Mult | Type |
|---|---|---|---|---|
| 1.a | even | 1 | 1 | trivial |
| 3.b | odd | 2 | 1 | CM by \(\Q(\sqrt{-3}) \) |
| 31.c | even | 3 | 1 | inner |
| 31.d | even | 5 | 1 | inner |
| 31.g | even | 15 | 1 | inner |
| 93.h | odd | 6 | 1 | inner |
| 93.l | odd | 10 | 1 | inner |
| 93.o | odd | 30 | 1 | inner |
Twists
Hecke kernels
This newform subspace can be constructed as the intersection of the kernels of the following linear operators acting on \(S_{1}^{\mathrm{new}}(2883, [\chi])\):
|
\( T_{2} \)
|
|
\( T_{7}^{8} - 2T_{7}^{7} - 2T_{7}^{5} + 9T_{7}^{4} - 8T_{7}^{3} + 5T_{7}^{2} - 3T_{7} + 1 \)
|
|
\( T_{13}^{8} + 2T_{13}^{7} + 2T_{13}^{5} + 9T_{13}^{4} + 8T_{13}^{3} + 5T_{13}^{2} + 3T_{13} + 1 \)
|
Hecke characteristic polynomials
| $p$ | $F_p(T)$ |
|---|---|
| $2$ |
\( T^{8} \)
|
| $3$ |
\( T^{8} + T^{7} - T^{5} + \cdots + 1 \)
|
| $5$ |
\( T^{8} \)
|
| $7$ |
\( T^{8} - 2 T^{7} + \cdots + 1 \)
|
| $11$ |
\( T^{8} \)
|
| $13$ |
\( T^{8} + 2 T^{7} + \cdots + 1 \)
|
| $17$ |
\( T^{8} \)
|
| $19$ |
\( T^{8} - 2 T^{7} + \cdots + 1 \)
|
| $23$ |
\( T^{8} \)
|
| $29$ |
\( T^{8} \)
|
| $31$ |
\( T^{8} \)
|
| $37$ |
\( (T^{4} + T^{3} + 2 T^{2} + \cdots + 1)^{2} \)
|
| $41$ |
\( T^{8} \)
|
| $43$ |
\( T^{8} - 3 T^{7} + \cdots + 1 \)
|
| $47$ |
\( T^{8} \)
|
| $53$ |
\( T^{8} \)
|
| $59$ |
\( T^{8} \)
|
| $61$ |
\( (T^{2} - T - 1)^{4} \)
|
| $67$ |
\( (T^{4} - T^{3} + 2 T^{2} + \cdots + 1)^{2} \)
|
| $71$ |
\( T^{8} \)
|
| $73$ |
\( T^{8} + 2 T^{7} + \cdots + 1 \)
|
| $79$ |
\( T^{8} - 3 T^{7} + \cdots + 1 \)
|
| $83$ |
\( T^{8} \)
|
| $89$ |
\( T^{8} \)
|
| $97$ |
\( (T^{4} - 3 T^{3} + 4 T^{2} + \cdots + 1)^{2} \)
|
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