Newspace parameters
comment: Compute space of new eigenforms
[N,k,chi] = [108,3,Mod(55,108)]
mf = mfinit([N,k,chi],0)
lf = mfeigenbasis(mf)
from sage.modular.dirichlet import DirichletCharacter
H = DirichletGroup(108, base_ring=CyclotomicField(2))
chi = DirichletCharacter(H, H._module([1, 0]))
N = Newforms(chi, 3, names="a")
//Please install CHIMP (https://github.com/edgarcosta/CHIMP) if you want to run this code
chi := DirichletCharacter("108.55");
S:= CuspForms(chi, 3);
N := Newforms(S);
| Level: | \( N \) | \(=\) | \( 108 = 2^{2} \cdot 3^{3} \) |
| Weight: | \( k \) | \(=\) | \( 3 \) |
| Character orbit: | \([\chi]\) | \(=\) | 108.d (of order \(2\), degree \(1\), 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: | \(2.94278685509\) |
| Analytic rank: | \(0\) |
| Dimension: | \(2\) |
| Coefficient field: | \(\Q(\sqrt{-3}) \) |
|
comment: defining polynomial
gp: f.mod \\ as an extension of the character field
|
|
| Defining polynomial: |
\( x^{2} - x + 1 \)
|
| Coefficient ring: | \(\Z[a_1, a_2]\) |
| Coefficient ring index: | \( 2 \) |
| Twist minimal: | yes |
| Sato-Tate group: | $\mathrm{SU}(2)[C_{2}]$ |
$q$-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 \(\beta = \sqrt{-3}\). We also show the integral \(q\)-expansion of the trace form.
Character values
We give the values of \(\chi\) on generators for \(\left(\mathbb{Z}/108\mathbb{Z}\right)^\times\).
| \(n\) | \(29\) | \(55\) |
| \(\chi(n)\) | \(1\) | \(-1\) |
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 | \(\iota_m(\nu)\) | \( a_{2} \) | \( a_{3} \) | \( a_{4} \) | \( a_{5} \) | \( a_{6} \) | \( a_{7} \) | \( a_{8} \) | \( a_{9} \) | \( a_{10} \) | ||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 55.1 |
|
1.00000 | − | 1.73205i | 0 | −2.00000 | − | 3.46410i | −7.00000 | 0 | − | 8.66025i | −8.00000 | 0 | −7.00000 | + | 12.1244i | |||||||||||||||||
| 55.2 | 1.00000 | + | 1.73205i | 0 | −2.00000 | + | 3.46410i | −7.00000 | 0 | 8.66025i | −8.00000 | 0 | −7.00000 | − | 12.1244i | |||||||||||||||||||
Inner twists
| Char | Parity | Ord | Mult | Type |
|---|---|---|---|---|
| 1.a | even | 1 | 1 | trivial |
| 4.b | odd | 2 | 1 | inner |
Twists
| By twisting character orbit | |||||||
|---|---|---|---|---|---|---|---|
| Char | Parity | Ord | Mult | Type | Twist | Min | Dim |
| 1.a | even | 1 | 1 | trivial | 108.3.d.b | yes | 2 |
| 3.b | odd | 2 | 1 | 108.3.d.a | ✓ | 2 | |
| 4.b | odd | 2 | 1 | inner | 108.3.d.b | yes | 2 |
| 8.b | even | 2 | 1 | 1728.3.g.f | 2 | ||
| 8.d | odd | 2 | 1 | 1728.3.g.f | 2 | ||
| 9.c | even | 3 | 1 | 324.3.f.b | 2 | ||
| 9.c | even | 3 | 1 | 324.3.f.h | 2 | ||
| 9.d | odd | 6 | 1 | 324.3.f.c | 2 | ||
| 9.d | odd | 6 | 1 | 324.3.f.i | 2 | ||
| 12.b | even | 2 | 1 | 108.3.d.a | ✓ | 2 | |
| 24.f | even | 2 | 1 | 1728.3.g.a | 2 | ||
| 24.h | odd | 2 | 1 | 1728.3.g.a | 2 | ||
| 36.f | odd | 6 | 1 | 324.3.f.b | 2 | ||
| 36.f | odd | 6 | 1 | 324.3.f.h | 2 | ||
| 36.h | even | 6 | 1 | 324.3.f.c | 2 | ||
| 36.h | even | 6 | 1 | 324.3.f.i | 2 | ||
| By twisted newform orbit | |||||||
|---|---|---|---|---|---|---|---|
| Twist | Min | Dim | Char | Parity | Ord | Mult | Type |
| 108.3.d.a | ✓ | 2 | 3.b | odd | 2 | 1 | |
| 108.3.d.a | ✓ | 2 | 12.b | even | 2 | 1 | |
| 108.3.d.b | yes | 2 | 1.a | even | 1 | 1 | trivial |
| 108.3.d.b | yes | 2 | 4.b | odd | 2 | 1 | inner |
| 324.3.f.b | 2 | 9.c | even | 3 | 1 | ||
| 324.3.f.b | 2 | 36.f | odd | 6 | 1 | ||
| 324.3.f.c | 2 | 9.d | odd | 6 | 1 | ||
| 324.3.f.c | 2 | 36.h | even | 6 | 1 | ||
| 324.3.f.h | 2 | 9.c | even | 3 | 1 | ||
| 324.3.f.h | 2 | 36.f | odd | 6 | 1 | ||
| 324.3.f.i | 2 | 9.d | odd | 6 | 1 | ||
| 324.3.f.i | 2 | 36.h | even | 6 | 1 | ||
| 1728.3.g.a | 2 | 24.f | even | 2 | 1 | ||
| 1728.3.g.a | 2 | 24.h | odd | 2 | 1 | ||
| 1728.3.g.f | 2 | 8.b | even | 2 | 1 | ||
| 1728.3.g.f | 2 | 8.d | odd | 2 | 1 | ||
Hecke kernels
This newform subspace can be constructed as the kernel of the linear operator
\( T_{5} + 7 \)
acting on \(S_{3}^{\mathrm{new}}(108, [\chi])\).
Hecke characteristic polynomials
| $p$ | $F_p(T)$ |
|---|---|
| $2$ |
\( T^{2} - 2T + 4 \)
|
| $3$ |
\( T^{2} \)
|
| $5$ |
\( (T + 7)^{2} \)
|
| $7$ |
\( T^{2} + 75 \)
|
| $11$ |
\( T^{2} + 75 \)
|
| $13$ |
\( (T - 20)^{2} \)
|
| $17$ |
\( (T - 8)^{2} \)
|
| $19$ |
\( T^{2} + 108 \)
|
| $23$ |
\( T^{2} + 12 \)
|
| $29$ |
\( (T + 10)^{2} \)
|
| $31$ |
\( T^{2} + 2883 \)
|
| $37$ |
\( (T + 10)^{2} \)
|
| $41$ |
\( (T - 50)^{2} \)
|
| $43$ |
\( T^{2} + 300 \)
|
| $47$ |
\( T^{2} + 7500 \)
|
| $53$ |
\( (T - 47)^{2} \)
|
| $59$ |
\( T^{2} + 1200 \)
|
| $61$ |
\( (T + 64)^{2} \)
|
| $67$ |
\( T^{2} + 7500 \)
|
| $71$ |
\( T^{2} \)
|
| $73$ |
\( (T + 55)^{2} \)
|
| $79$ |
\( T^{2} + 48 \)
|
| $83$ |
\( T^{2} + 867 \)
|
| $89$ |
\( (T + 10)^{2} \)
|
| $97$ |
\( (T + 25)^{2} \)
|
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