Newspace parameters
comment: Compute space of new eigenforms
[N,k,chi] = [855,2,Mod(77,855)]
mf = mfinit([N,k,chi],0)
lf = mfeigenbasis(mf)
from sage.modular.dirichlet import DirichletCharacter
H = DirichletGroup(855, base_ring=CyclotomicField(12))
chi = DirichletCharacter(H, H._module([10, 3, 0]))
N = Newforms(chi, 2, names="a")
//Please install CHIMP (https://github.com/edgarcosta/CHIMP) if you want to run this code
chi := DirichletCharacter("855.77");
S:= CuspForms(chi, 2);
N := Newforms(S);
| Level: | \( N \) | \(=\) | \( 855 = 3^{2} \cdot 5 \cdot 19 \) |
| Weight: | \( k \) | \(=\) | \( 2 \) |
| Character orbit: | \([\chi]\) | \(=\) | 855.cg (of order \(12\), 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: | \(6.82720937282\) |
| Analytic rank: | \(1\) |
| Dimension: | \(4\) |
| Coefficient field: | \(\Q(\zeta_{12})\) |
|
comment: defining polynomial
gp: f.mod \\ as an extension of the character field
|
|
| Defining polynomial: |
\( x^{4} - x^{2} + 1 \)
|
| Coefficient ring: | \(\Z[a_1, a_2]\) |
| Coefficient ring index: | \( 1 \) |
| Twist minimal: | yes |
| Sato-Tate group: | $\mathrm{SU}(2)[C_{12}]$ |
$q$-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 \(\zeta_{12}\). We also show the integral \(q\)-expansion of the trace form.
Character values
We give the values of \(\chi\) on generators for \(\left(\mathbb{Z}/855\mathbb{Z}\right)^\times\).
| \(n\) | \(172\) | \(191\) | \(496\) |
| \(\chi(n)\) | \(\zeta_{12}^{3}\) | \(\zeta_{12}^{2}\) | \(1\) |
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 | \(\iota_m(\nu)\) | \( a_{2} \) | \( a_{3} \) | \( a_{4} \) | \( a_{5} \) | \( a_{6} \) | \( a_{7} \) | \( a_{8} \) | \( a_{9} \) | \( a_{10} \) | ||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 77.1 |
|
−0.500000 | − | 0.133975i | −0.866025 | + | 1.50000i | −1.50000 | − | 0.866025i | 0.133975 | − | 2.23205i | 0.633975 | − | 0.633975i | 0.232051 | − | 0.866025i | 1.36603 | + | 1.36603i | −1.50000 | − | 2.59808i | −0.366025 | + | 1.09808i | ||||||||||||
| 248.1 | −0.500000 | + | 1.86603i | 0.866025 | − | 1.50000i | −1.50000 | − | 0.866025i | 1.86603 | − | 1.23205i | 2.36603 | + | 2.36603i | −3.23205 | − | 0.866025i | −0.366025 | + | 0.366025i | −1.50000 | − | 2.59808i | 1.36603 | + | 4.09808i | |||||||||||||
| 362.1 | −0.500000 | − | 1.86603i | 0.866025 | + | 1.50000i | −1.50000 | + | 0.866025i | 1.86603 | + | 1.23205i | 2.36603 | − | 2.36603i | −3.23205 | + | 0.866025i | −0.366025 | − | 0.366025i | −1.50000 | + | 2.59808i | 1.36603 | − | 4.09808i | |||||||||||||
| 533.1 | −0.500000 | + | 0.133975i | −0.866025 | − | 1.50000i | −1.50000 | + | 0.866025i | 0.133975 | + | 2.23205i | 0.633975 | + | 0.633975i | 0.232051 | + | 0.866025i | 1.36603 | − | 1.36603i | −1.50000 | + | 2.59808i | −0.366025 | − | 1.09808i | |||||||||||||
Inner twists
| Char | Parity | Ord | Mult | Type |
|---|---|---|---|---|
| 1.a | even | 1 | 1 | trivial |
| 45.l | even | 12 | 1 | inner |
Twists
| By twisting character orbit | |||||||
|---|---|---|---|---|---|---|---|
| Char | Parity | Ord | Mult | Type | Twist | Min | Dim |
| 1.a | even | 1 | 1 | trivial | 855.2.cg.b | yes | 4 |
| 5.c | odd | 4 | 1 | 855.2.cg.a | ✓ | 4 | |
| 9.d | odd | 6 | 1 | 855.2.cg.a | ✓ | 4 | |
| 45.l | even | 12 | 1 | inner | 855.2.cg.b | yes | 4 |
| By twisted newform orbit | |||||||
|---|---|---|---|---|---|---|---|
| Twist | Min | Dim | Char | Parity | Ord | Mult | Type |
| 855.2.cg.a | ✓ | 4 | 5.c | odd | 4 | 1 | |
| 855.2.cg.a | ✓ | 4 | 9.d | odd | 6 | 1 | |
| 855.2.cg.b | yes | 4 | 1.a | even | 1 | 1 | trivial |
| 855.2.cg.b | yes | 4 | 45.l | even | 12 | 1 | inner |
Hecke kernels
This newform subspace can be constructed as the kernel of the linear operator
\( T_{2}^{4} + 2T_{2}^{3} + 5T_{2}^{2} + 4T_{2} + 1 \)
acting on \(S_{2}^{\mathrm{new}}(855, [\chi])\).
Hecke characteristic polynomials
| $p$ | $F_p(T)$ |
|---|---|
| $2$ |
\( T^{4} + 2 T^{3} + \cdots + 1 \)
|
| $3$ |
\( T^{4} + 3T^{2} + 9 \)
|
| $5$ |
\( T^{4} - 4 T^{3} + \cdots + 25 \)
|
| $7$ |
\( T^{4} + 6 T^{3} + \cdots + 9 \)
|
| $11$ |
\( T^{4} + 12 T^{3} + \cdots + 64 \)
|
| $13$ |
\( T^{4} + 8 T^{3} + \cdots + 16 \)
|
| $17$ |
\( T^{4} - 4 T^{3} + \cdots + 16 \)
|
| $19$ |
\( (T^{2} + 1)^{2} \)
|
| $23$ |
\( T^{4} + 6 T^{3} + \cdots + 1521 \)
|
| $29$ |
\( T^{4} - 6 T^{3} + \cdots + 9 \)
|
| $31$ |
\( T^{4} + 10 T^{3} + \cdots + 4 \)
|
| $37$ |
\( T^{4} + 16 T^{3} + \cdots + 64 \)
|
| $41$ |
\( T^{4} + 18 T^{3} + \cdots + 529 \)
|
| $43$ |
\( T^{4} + 22 T^{3} + \cdots + 2116 \)
|
| $47$ |
\( T^{4} + 8 T^{3} + \cdots + 121 \)
|
| $53$ |
\( T^{4} - 20 T^{3} + \cdots + 1936 \)
|
| $59$ |
\( T^{4} - 16 T^{3} + \cdots + 256 \)
|
| $61$ |
\( T^{4} + 12 T^{3} + \cdots + 1521 \)
|
| $67$ |
\( T^{4} + 24 T^{3} + \cdots + 9801 \)
|
| $71$ |
\( T^{4} + 24T^{2} + 36 \)
|
| $73$ |
\( (T^{2} + 18 T + 162)^{2} \)
|
| $79$ |
\( T^{4} + 30 T^{3} + \cdots + 4356 \)
|
| $83$ |
\( T^{4} + 16 T^{3} + \cdots + 3721 \)
|
| $89$ |
\( (T^{2} - 18 T + 33)^{2} \)
|
| $97$ |
\( T^{4} + 18 T^{3} + \cdots + 26244 \)
|
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