Newspace parameters
comment: Compute space of new eigenforms
[N,k,chi] = [990,2,Mod(91,990)]
mf = mfinit([N,k,chi],0)
lf = mfeigenbasis(mf)
from sage.modular.dirichlet import DirichletCharacter
H = DirichletGroup(990, base_ring=CyclotomicField(10))
chi = DirichletCharacter(H, H._module([0, 0, 8]))
N = Newforms(chi, 2, names="a")
//Please install CHIMP (https://github.com/edgarcosta/CHIMP) if you want to run this code
chi := DirichletCharacter("990.91");
S:= CuspForms(chi, 2);
N := Newforms(S);
| Level: | \( N \) | \(=\) | \( 990 = 2 \cdot 3^{2} \cdot 5 \cdot 11 \) |
| Weight: | \( k \) | \(=\) | \( 2 \) |
| Character orbit: | \([\chi]\) | \(=\) | 990.n (of order \(5\), degree \(4\), 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: | \(7.90518980011\) |
| Analytic rank: | \(0\) |
| Dimension: | \(4\) |
| Coefficient field: | \(\Q(\zeta_{10})\) |
|
comment: defining polynomial
gp: f.mod \\ as an extension of the character field
|
|
| Defining polynomial: |
\( x^{4} - x^{3} + x^{2} - x + 1 \)
|
| Coefficient ring: | \(\Z[a_1, a_2]\) |
| Coefficient ring index: | \( 1 \) |
| Twist minimal: | no (minimal twist has level 330) |
| Sato-Tate group: | $\mathrm{SU}(2)[C_{5}]$ |
$q$-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 primitive root of unity \(\zeta_{10}\). We also show the integral \(q\)-expansion of the trace form.
Character values
We give the values of \(\chi\) on generators for \(\left(\mathbb{Z}/990\mathbb{Z}\right)^\times\).
| \(n\) | \(397\) | \(541\) | \(551\) |
| \(\chi(n)\) | \(1\) | \(-\zeta_{10}^{3}\) | \(1\) |
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 | \(\iota_m(\nu)\) | \( a_{2} \) | \( a_{3} \) | \( a_{4} \) | \( a_{5} \) | \( a_{6} \) | \( a_{7} \) | \( a_{8} \) | \( a_{9} \) | \( a_{10} \) | ||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 91.1 |
|
−0.809017 | + | 0.587785i | 0 | 0.309017 | − | 0.951057i | 0.809017 | + | 0.587785i | 0 | 1.00000 | − | 3.07768i | 0.309017 | + | 0.951057i | 0 | −1.00000 | ||||||||||||||||||||
| 181.1 | 0.309017 | + | 0.951057i | 0 | −0.809017 | + | 0.587785i | −0.309017 | + | 0.951057i | 0 | 1.00000 | − | 0.726543i | −0.809017 | − | 0.587785i | 0 | −1.00000 | |||||||||||||||||||||
| 361.1 | 0.309017 | − | 0.951057i | 0 | −0.809017 | − | 0.587785i | −0.309017 | − | 0.951057i | 0 | 1.00000 | + | 0.726543i | −0.809017 | + | 0.587785i | 0 | −1.00000 | |||||||||||||||||||||
| 631.1 | −0.809017 | − | 0.587785i | 0 | 0.309017 | + | 0.951057i | 0.809017 | − | 0.587785i | 0 | 1.00000 | + | 3.07768i | 0.309017 | − | 0.951057i | 0 | −1.00000 | |||||||||||||||||||||
Inner twists
| Char | Parity | Ord | Mult | Type |
|---|---|---|---|---|
| 1.a | even | 1 | 1 | trivial |
| 11.c | even | 5 | 1 | inner |
Twists
| By twisting character orbit | |||||||
|---|---|---|---|---|---|---|---|
| Char | Parity | Ord | Mult | Type | Twist | Min | Dim |
| 1.a | even | 1 | 1 | trivial | 990.2.n.d | 4 | |
| 3.b | odd | 2 | 1 | 330.2.m.c | ✓ | 4 | |
| 11.c | even | 5 | 1 | inner | 990.2.n.d | 4 | |
| 33.f | even | 10 | 1 | 3630.2.a.bm | 2 | ||
| 33.h | odd | 10 | 1 | 330.2.m.c | ✓ | 4 | |
| 33.h | odd | 10 | 1 | 3630.2.a.be | 2 | ||
| By twisted newform orbit | |||||||
|---|---|---|---|---|---|---|---|
| Twist | Min | Dim | Char | Parity | Ord | Mult | Type |
| 330.2.m.c | ✓ | 4 | 3.b | odd | 2 | 1 | |
| 330.2.m.c | ✓ | 4 | 33.h | odd | 10 | 1 | |
| 990.2.n.d | 4 | 1.a | even | 1 | 1 | trivial | |
| 990.2.n.d | 4 | 11.c | even | 5 | 1 | inner | |
| 3630.2.a.be | 2 | 33.h | odd | 10 | 1 | ||
| 3630.2.a.bm | 2 | 33.f | even | 10 | 1 | ||
Hecke kernels
This newform subspace can be constructed as the intersection of the kernels of the following linear operators acting on \(S_{2}^{\mathrm{new}}(990, [\chi])\):
|
\( T_{7}^{4} - 4T_{7}^{3} + 16T_{7}^{2} - 24T_{7} + 16 \)
|
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\( T_{13}^{4} - 2T_{13}^{3} + 4T_{13}^{2} - 3T_{13} + 1 \)
|
|
\( T_{17}^{4} + 7T_{17}^{3} + 34T_{17}^{2} + 88T_{17} + 121 \)
|
Hecke characteristic polynomials
| $p$ | $F_p(T)$ |
|---|---|
| $2$ |
\( T^{4} + T^{3} + T^{2} + \cdots + 1 \)
|
| $3$ |
\( T^{4} \)
|
| $5$ |
\( T^{4} - T^{3} + T^{2} + \cdots + 1 \)
|
| $7$ |
\( T^{4} - 4 T^{3} + \cdots + 16 \)
|
| $11$ |
\( T^{4} - T^{3} + \cdots + 121 \)
|
| $13$ |
\( T^{4} - 2 T^{3} + \cdots + 1 \)
|
| $17$ |
\( T^{4} + 7 T^{3} + \cdots + 121 \)
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| $19$ |
\( T^{4} + 2 T^{3} + \cdots + 16 \)
|
| $23$ |
\( (T^{2} + 5 T + 5)^{2} \)
|
| $29$ |
\( T^{4} + 13 T^{3} + \cdots + 961 \)
|
| $31$ |
\( T^{4} - 8 T^{3} + \cdots + 121 \)
|
| $37$ |
\( T^{4} + 10 T^{3} + \cdots + 25 \)
|
| $41$ |
\( T^{4} + 10 T^{3} + \cdots + 400 \)
|
| $43$ |
\( (T^{2} + 5 T - 5)^{2} \)
|
| $47$ |
\( T^{4} - 15 T^{3} + \cdots + 24025 \)
|
| $53$ |
\( T^{4} + 6 T^{3} + \cdots + 16 \)
|
| $59$ |
\( T^{4} + 4 T^{3} + \cdots + 1 \)
|
| $61$ |
\( T^{4} - 16 T^{3} + \cdots + 256 \)
|
| $67$ |
\( (T^{2} + 3 T - 59)^{2} \)
|
| $71$ |
\( T^{4} - 28 T^{3} + \cdots + 30976 \)
|
| $73$ |
\( T^{4} - 10 T^{3} + \cdots + 400 \)
|
| $79$ |
\( T^{4} - 23 T^{3} + \cdots + 10201 \)
|
| $83$ |
\( T^{4} + 16 T^{3} + \cdots + 256 \)
|
| $89$ |
\( (T^{2} - 2 T - 44)^{2} \)
|
| $97$ |
\( T^{4} + 26 T^{3} + \cdots + 5776 \)
|
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