Newspace parameters
comment: Compute space of new eigenforms
[N,k,chi] = [216,4,Mod(1,216)]
mf = mfinit([N,k,chi],0)
lf = mfeigenbasis(mf)
from sage.modular.dirichlet import DirichletCharacter
H = DirichletGroup(216, base_ring=CyclotomicField(2))
chi = DirichletCharacter(H, H._module([0, 0, 0]))
N = Newforms(chi, 4, names="a")
//Please install CHIMP (https://github.com/edgarcosta/CHIMP) if you want to run this code
chi := DirichletCharacter("216.1");
S:= CuspForms(chi, 4);
N := Newforms(S);
| Level: | \( N \) | \(=\) | \( 216 = 2^{3} \cdot 3^{3} \) |
| Weight: | \( k \) | \(=\) | \( 4 \) |
| Character orbit: | \([\chi]\) | \(=\) | 216.a (trivial) |
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: | yes |
| Analytic conductor: | \(12.7444125612\) |
| Analytic rank: | \(0\) |
| Dimension: | \(2\) |
| Coefficient field: | \(\Q(\sqrt{5}) \) |
|
comment: defining polynomial
gp: f.mod \\ as an extension of the character field
|
|
| Defining polynomial: |
\( x^{2} - x - 1 \)
|
| Coefficient ring: | \(\Z[a_1, \ldots, a_{5}]\) |
| Coefficient ring index: | \( 2^{2}\cdot 3 \) |
| Twist minimal: | yes |
| Fricke sign: | \(1\) |
| Sato-Tate group: | $\mathrm{SU}(2)$ |
$q$-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 \(\beta = 6\sqrt{5}\). We also show the integral \(q\)-expansion of the trace form.
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 | \(\iota_m(\nu)\) | \( a_{2} \) | \( a_{3} \) | \( a_{4} \) | \( a_{5} \) | \( a_{6} \) | \( a_{7} \) | \( a_{8} \) | \( a_{9} \) | \( a_{10} \) | ||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1.1 |
|
0 | 0 | 0 | −11.4164 | 0 | −29.8328 | 0 | 0 | 0 | ||||||||||||||||||||||||
| 1.2 | 0 | 0 | 0 | 15.4164 | 0 | 23.8328 | 0 | 0 | 0 | |||||||||||||||||||||||||
Atkin-Lehner signs
| \( p \) | Sign |
|---|---|
| \(2\) | \(-1\) |
| \(3\) | \(-1\) |
Inner twists
This newform does not admit any (nontrivial) inner twists.
Twists
| By twisting character orbit | |||||||
|---|---|---|---|---|---|---|---|
| Char | Parity | Ord | Mult | Type | Twist | Min | Dim |
| 1.a | even | 1 | 1 | trivial | 216.4.a.g | yes | 2 |
| 3.b | odd | 2 | 1 | 216.4.a.f | ✓ | 2 | |
| 4.b | odd | 2 | 1 | 432.4.a.r | 2 | ||
| 8.b | even | 2 | 1 | 1728.4.a.bi | 2 | ||
| 8.d | odd | 2 | 1 | 1728.4.a.bj | 2 | ||
| 9.c | even | 3 | 2 | 648.4.i.o | 4 | ||
| 9.d | odd | 6 | 2 | 648.4.i.r | 4 | ||
| 12.b | even | 2 | 1 | 432.4.a.p | 2 | ||
| 24.f | even | 2 | 1 | 1728.4.a.br | 2 | ||
| 24.h | odd | 2 | 1 | 1728.4.a.bq | 2 | ||
| By twisted newform orbit | |||||||
|---|---|---|---|---|---|---|---|
| Twist | Min | Dim | Char | Parity | Ord | Mult | Type |
| 216.4.a.f | ✓ | 2 | 3.b | odd | 2 | 1 | |
| 216.4.a.g | yes | 2 | 1.a | even | 1 | 1 | trivial |
| 432.4.a.p | 2 | 12.b | even | 2 | 1 | ||
| 432.4.a.r | 2 | 4.b | odd | 2 | 1 | ||
| 648.4.i.o | 4 | 9.c | even | 3 | 2 | ||
| 648.4.i.r | 4 | 9.d | odd | 6 | 2 | ||
| 1728.4.a.bi | 2 | 8.b | even | 2 | 1 | ||
| 1728.4.a.bj | 2 | 8.d | odd | 2 | 1 | ||
| 1728.4.a.bq | 2 | 24.h | odd | 2 | 1 | ||
| 1728.4.a.br | 2 | 24.f | even | 2 | 1 | ||
Hecke kernels
This newform subspace can be constructed as the kernel of the linear operator
\( T_{5}^{2} - 4T_{5} - 176 \)
acting on \(S_{4}^{\mathrm{new}}(\Gamma_0(216))\).
Hecke characteristic polynomials
| $p$ | $F_p(T)$ |
|---|---|
| $2$ |
\( T^{2} \)
|
| $3$ |
\( T^{2} \)
|
| $5$ |
\( T^{2} - 4T - 176 \)
|
| $7$ |
\( T^{2} + 6T - 711 \)
|
| $11$ |
\( T^{2} - 52T - 944 \)
|
| $13$ |
\( T^{2} - 26T - 551 \)
|
| $17$ |
\( T^{2} - 188T + 8656 \)
|
| $19$ |
\( T^{2} + 74T - 10151 \)
|
| $23$ |
\( T^{2} - 148T + 976 \)
|
| $29$ |
\( T^{2} - 288T + 9216 \)
|
| $31$ |
\( T^{2} + 248T + 3856 \)
|
| $37$ |
\( T^{2} - 342T + 11241 \)
|
| $41$ |
\( T^{2} - 184320 \)
|
| $43$ |
\( T^{2} + 256T + 13504 \)
|
| $47$ |
\( T^{2} - 132T + 4176 \)
|
| $53$ |
\( T^{2} - 952T + 191296 \)
|
| $59$ |
\( T^{2} + 1004 T + 172624 \)
|
| $61$ |
\( T^{2} + 34T - 207791 \)
|
| $67$ |
\( T^{2} + 866T + 141409 \)
|
| $71$ |
\( T^{2} - 776T - 11456 \)
|
| $73$ |
\( T^{2} - 1874 T + 852049 \)
|
| $79$ |
\( T^{2} - 182T - 113399 \)
|
| $83$ |
\( T^{2} + 1336T + 65344 \)
|
| $89$ |
\( T^{2} - 876T + 112464 \)
|
| $97$ |
\( T^{2} + 38T - 1393559 \)
|
| show more | |
| show less |