Newspace parameters
comment: Compute space of new eigenforms
[N,k,chi] = [82,2,Mod(37,82)]
mf = mfinit([N,k,chi],0)
lf = mfeigenbasis(mf)
from sage.modular.dirichlet import DirichletCharacter
H = DirichletGroup(82, base_ring=CyclotomicField(10))
chi = DirichletCharacter(H, H._module([8]))
N = Newforms(chi, 2, names="a")
//Please install CHIMP (https://github.com/edgarcosta/CHIMP) if you want to run this code
chi := DirichletCharacter("82.37");
S:= CuspForms(chi, 2);
N := Newforms(S);
| Level: | \( N \) | \(=\) | \( 82 = 2 \cdot 41 \) |
| Weight: | \( k \) | \(=\) | \( 2 \) |
| Character orbit: | \([\chi]\) | \(=\) | 82.d (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: | \(0.654773296574\) |
| 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: | yes |
| 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 \(\left(\mathbb{Z}/82\mathbb{Z}\right)^\times\).
| \(n\) | \(47\) |
| \(\chi(n)\) | \(-\zeta_{10}^{3}\) |
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 | \(\iota_m(\nu)\) | \( a_{2} \) | \( a_{3} \) | \( a_{4} \) | \( a_{5} \) | \( a_{6} \) | \( a_{7} \) | \( a_{8} \) | \( a_{9} \) | \( a_{10} \) | ||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 37.1 |
|
0.809017 | − | 0.587785i | −0.618034 | 0.309017 | − | 0.951057i | 0.500000 | − | 1.53884i | −0.500000 | + | 0.363271i | 2.11803 | + | 1.53884i | −0.309017 | − | 0.951057i | −2.61803 | −0.500000 | − | 1.53884i | ||||||||||||||||
| 51.1 | 0.809017 | + | 0.587785i | −0.618034 | 0.309017 | + | 0.951057i | 0.500000 | + | 1.53884i | −0.500000 | − | 0.363271i | 2.11803 | − | 1.53884i | −0.309017 | + | 0.951057i | −2.61803 | −0.500000 | + | 1.53884i | |||||||||||||||||
| 57.1 | −0.309017 | + | 0.951057i | 1.61803 | −0.809017 | − | 0.587785i | 0.500000 | + | 0.363271i | −0.500000 | + | 1.53884i | −0.118034 | − | 0.363271i | 0.809017 | − | 0.587785i | −0.381966 | −0.500000 | + | 0.363271i | |||||||||||||||||
| 59.1 | −0.309017 | − | 0.951057i | 1.61803 | −0.809017 | + | 0.587785i | 0.500000 | − | 0.363271i | −0.500000 | − | 1.53884i | −0.118034 | + | 0.363271i | 0.809017 | + | 0.587785i | −0.381966 | −0.500000 | − | 0.363271i | |||||||||||||||||
Inner twists
| Char | Parity | Ord | Mult | Type |
|---|---|---|---|---|
| 1.a | even | 1 | 1 | trivial |
| 41.d | even | 5 | 1 | inner |
Twists
| By twisting character orbit | |||||||
|---|---|---|---|---|---|---|---|
| Char | Parity | Ord | Mult | Type | Twist | Min | Dim |
| 1.a | even | 1 | 1 | trivial | 82.2.d.b | ✓ | 4 |
| 3.b | odd | 2 | 1 | 738.2.h.b | 4 | ||
| 4.b | odd | 2 | 1 | 656.2.u.b | 4 | ||
| 41.d | even | 5 | 1 | inner | 82.2.d.b | ✓ | 4 |
| 41.d | even | 5 | 1 | 3362.2.a.h | 2 | ||
| 41.f | even | 10 | 1 | 3362.2.a.e | 2 | ||
| 123.k | odd | 10 | 1 | 738.2.h.b | 4 | ||
| 164.j | odd | 10 | 1 | 656.2.u.b | 4 | ||
| By twisted newform orbit | |||||||
|---|---|---|---|---|---|---|---|
| Twist | Min | Dim | Char | Parity | Ord | Mult | Type |
| 82.2.d.b | ✓ | 4 | 1.a | even | 1 | 1 | trivial |
| 82.2.d.b | ✓ | 4 | 41.d | even | 5 | 1 | inner |
| 656.2.u.b | 4 | 4.b | odd | 2 | 1 | ||
| 656.2.u.b | 4 | 164.j | odd | 10 | 1 | ||
| 738.2.h.b | 4 | 3.b | odd | 2 | 1 | ||
| 738.2.h.b | 4 | 123.k | odd | 10 | 1 | ||
| 3362.2.a.e | 2 | 41.f | even | 10 | 1 | ||
| 3362.2.a.h | 2 | 41.d | even | 5 | 1 | ||
Hecke kernels
This newform subspace can be constructed as the kernel of the linear operator
\( T_{3}^{2} - T_{3} - 1 \)
acting on \(S_{2}^{\mathrm{new}}(82, [\chi])\).
Hecke characteristic polynomials
| $p$ | $F_p(T)$ |
|---|---|
| $2$ |
\( T^{4} - T^{3} + T^{2} + \cdots + 1 \)
|
| $3$ |
\( (T^{2} - T - 1)^{2} \)
|
| $5$ |
\( T^{4} - 2 T^{3} + \cdots + 1 \)
|
| $7$ |
\( T^{4} - 4 T^{3} + \cdots + 1 \)
|
| $11$ |
\( T^{4} + 3 T^{3} + \cdots + 81 \)
|
| $13$ |
\( T^{4} + 9 T^{3} + \cdots + 121 \)
|
| $17$ |
\( T^{4} + 3 T^{3} + \cdots + 1 \)
|
| $19$ |
\( T^{4} + T^{3} + \cdots + 121 \)
|
| $23$ |
\( T^{4} - 3 T^{3} + \cdots + 1 \)
|
| $29$ |
\( T^{4} - 15 T^{3} + \cdots + 25 \)
|
| $31$ |
\( T^{4} + 12 T^{3} + \cdots + 961 \)
|
| $37$ |
\( T^{4} - 13 T^{3} + \cdots + 121 \)
|
| $41$ |
\( T^{4} - 11 T^{3} + \cdots + 1681 \)
|
| $43$ |
\( T^{4} + 18 T^{3} + \cdots + 1296 \)
|
| $47$ |
\( T^{4} + 4 T^{3} + \cdots + 256 \)
|
| $53$ |
\( T^{4} + T^{3} + \cdots + 3721 \)
|
| $59$ |
\( T^{4} - 12 T^{3} + \cdots + 961 \)
|
| $61$ |
\( T^{4} - 9 T^{3} + \cdots + 361 \)
|
| $67$ |
\( T^{4} + 28 T^{3} + \cdots + 30976 \)
|
| $71$ |
\( T^{4} - 7 T^{3} + \cdots + 121 \)
|
| $73$ |
\( (T^{2} + 10 T - 100)^{2} \)
|
| $79$ |
\( (T - 14)^{4} \)
|
| $83$ |
\( (T^{2} + 21 T + 79)^{2} \)
|
| $89$ |
\( T^{4} - 9 T^{3} + \cdots + 121 \)
|
| $97$ |
\( T^{4} - 9 T^{3} + \cdots + 361 \)
|
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