Newspace parameters
comment: Compute space of new eigenforms
[N,k,chi] = [1296,3,Mod(161,1296)]
mf = mfinit([N,k,chi],0)
lf = mfeigenbasis(mf)
from sage.modular.dirichlet import DirichletCharacter
H = DirichletGroup(1296, base_ring=CyclotomicField(2))
chi = DirichletCharacter(H, H._module([0, 0, 1]))
N = Newforms(chi, 3, names="a")
//Please install CHIMP (https://github.com/edgarcosta/CHIMP) if you want to run this code
chi := DirichletCharacter("1296.161");
S:= CuspForms(chi, 3);
N := Newforms(S);
| Level: | \( N \) | \(=\) | \( 1296 = 2^{4} \cdot 3^{4} \) |
| Weight: | \( k \) | \(=\) | \( 3 \) |
| Character orbit: | \([\chi]\) | \(=\) | 1296.e (of order \(2\), degree \(1\), 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: | \(35.3134422611\) |
| Analytic rank: | \(0\) |
| Dimension: | \(4\) |
| Coefficient field: | \(\Q(\sqrt{-2}, \sqrt{3})\) |
|
comment: defining polynomial
gp: f.mod \\ as an extension of the character field
|
|
| Defining polynomial: |
\( x^{4} + 4x^{2} + 1 \)
|
| Coefficient ring: | \(\Z[a_1, \ldots, a_{11}]\) |
| Coefficient ring index: | \( 3^{3} \) |
| Twist minimal: | no (minimal twist has level 81) |
| 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 a basis \(1,\beta_1,\beta_2,\beta_3\) for the coefficient ring described below. We also show the integral \(q\)-expansion of the trace form.
Basis of coefficient ring in terms of a root \(\nu\) of
\( x^{4} + 4x^{2} + 1 \)
:
| \(\beta_{1}\) | \(=\) |
\( \nu^{3} + 8\nu \)
|
| \(\beta_{2}\) | \(=\) |
\( -2\nu^{3} - 7\nu \)
|
| \(\beta_{3}\) | \(=\) |
\( 3\nu^{2} + 6 \)
|
| \(\nu\) | \(=\) |
\( ( \beta_{2} + 2\beta_1 ) / 9 \)
|
| \(\nu^{2}\) | \(=\) |
\( ( \beta_{3} - 6 ) / 3 \)
|
| \(\nu^{3}\) | \(=\) |
\( ( -8\beta_{2} - 7\beta_1 ) / 9 \)
|
Character values
We give the values of \(\chi\) on generators for \(\left(\mathbb{Z}/1296\mathbb{Z}\right)^\times\).
| \(n\) | \(325\) | \(1135\) | \(1217\) |
| \(\chi(n)\) | \(1\) | \(1\) | \(-1\) |
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 | \(\iota_m(\nu)\) | \( a_{2} \) | \( a_{3} \) | \( a_{4} \) | \( a_{5} \) | \( a_{6} \) | \( a_{7} \) | \( a_{8} \) | \( a_{9} \) | \( a_{10} \) | ||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 161.1 |
|
0 | 0 | 0 | − | 8.24504i | 0 | −4.19615 | 0 | 0 | 0 | |||||||||||||||||||||||||||||
| 161.2 | 0 | 0 | 0 | − | 4.00240i | 0 | 6.19615 | 0 | 0 | 0 | ||||||||||||||||||||||||||||||
| 161.3 | 0 | 0 | 0 | 4.00240i | 0 | 6.19615 | 0 | 0 | 0 | |||||||||||||||||||||||||||||||
| 161.4 | 0 | 0 | 0 | 8.24504i | 0 | −4.19615 | 0 | 0 | 0 | |||||||||||||||||||||||||||||||
Inner twists
| Char | Parity | Ord | Mult | Type |
|---|---|---|---|---|
| 1.a | even | 1 | 1 | trivial |
| 3.b | odd | 2 | 1 | inner |
Twists
| By twisting character orbit | |||||||
|---|---|---|---|---|---|---|---|
| Char | Parity | Ord | Mult | Type | Twist | Min | Dim |
| 1.a | even | 1 | 1 | trivial | 1296.3.e.h | 4 | |
| 3.b | odd | 2 | 1 | inner | 1296.3.e.h | 4 | |
| 4.b | odd | 2 | 1 | 81.3.b.b | ✓ | 4 | |
| 9.c | even | 3 | 2 | 1296.3.q.m | 8 | ||
| 9.d | odd | 6 | 2 | 1296.3.q.m | 8 | ||
| 12.b | even | 2 | 1 | 81.3.b.b | ✓ | 4 | |
| 36.f | odd | 6 | 2 | 81.3.d.c | 8 | ||
| 36.h | even | 6 | 2 | 81.3.d.c | 8 | ||
| By twisted newform orbit | |||||||
|---|---|---|---|---|---|---|---|
| Twist | Min | Dim | Char | Parity | Ord | Mult | Type |
| 81.3.b.b | ✓ | 4 | 4.b | odd | 2 | 1 | |
| 81.3.b.b | ✓ | 4 | 12.b | even | 2 | 1 | |
| 81.3.d.c | 8 | 36.f | odd | 6 | 2 | ||
| 81.3.d.c | 8 | 36.h | even | 6 | 2 | ||
| 1296.3.e.h | 4 | 1.a | even | 1 | 1 | trivial | |
| 1296.3.e.h | 4 | 3.b | odd | 2 | 1 | inner | |
| 1296.3.q.m | 8 | 9.c | even | 3 | 2 | ||
| 1296.3.q.m | 8 | 9.d | odd | 6 | 2 | ||
Hecke kernels
This newform subspace can be constructed as the intersection of the kernels of the following linear operators acting on \(S_{3}^{\mathrm{new}}(1296, [\chi])\):
|
\( T_{5}^{4} + 84T_{5}^{2} + 1089 \)
|
|
\( T_{7}^{2} - 2T_{7} - 26 \)
|
Hecke characteristic polynomials
| $p$ | $F_p(T)$ |
|---|---|
| $2$ |
\( T^{4} \)
|
| $3$ |
\( T^{4} \)
|
| $5$ |
\( T^{4} + 84T^{2} + 1089 \)
|
| $7$ |
\( (T^{2} - 2 T - 26)^{2} \)
|
| $11$ |
\( T^{4} + 156T^{2} + 4356 \)
|
| $13$ |
\( (T^{2} - 22 T + 13)^{2} \)
|
| $17$ |
\( T^{4} + 108T^{2} + 729 \)
|
| $19$ |
\( (T^{2} - 14 T - 194)^{2} \)
|
| $23$ |
\( T^{4} + 1956 T^{2} + 617796 \)
|
| $29$ |
\( T^{4} + 12T^{2} + 9 \)
|
| $31$ |
\( (T^{2} - 32 T + 148)^{2} \)
|
| $37$ |
\( (T^{2} - 4 T - 239)^{2} \)
|
| $41$ |
\( T^{4} + 2316 T^{2} + 1313316 \)
|
| $43$ |
\( (T^{2} + 70 T + 1198)^{2} \)
|
| $47$ |
\( T^{4} + 7536 T^{2} + 13927824 \)
|
| $53$ |
\( (T^{2} + 4374)^{2} \)
|
| $59$ |
\( T^{4} + 1488 T^{2} + 24336 \)
|
| $61$ |
\( (T^{2} - 88 T + 1261)^{2} \)
|
| $67$ |
\( (T^{2} + 58 T - 8906)^{2} \)
|
| $71$ |
\( T^{4} + 7236 T^{2} + 10850436 \)
|
| $73$ |
\( (T^{2} + 32 T - 1931)^{2} \)
|
| $79$ |
\( (T^{2} - 182 T + 8254)^{2} \)
|
| $83$ |
\( T^{4} + 17616 T^{2} + 74235456 \)
|
| $89$ |
\( T^{4} + 29268 T^{2} + 213364449 \)
|
| $97$ |
\( (T^{2} - 16 T - 2636)^{2} \)
|
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