Newspace parameters
comment: Compute space of new eigenforms
[N,k,chi] = [1156,2,Mod(1,1156)]
mf = mfinit([N,k,chi],0)
lf = mfeigenbasis(mf)
from sage.modular.dirichlet import DirichletCharacter
H = DirichletGroup(1156, base_ring=CyclotomicField(2))
chi = DirichletCharacter(H, H._module([0, 0]))
N = Newforms(chi, 2, names="a")
//Please install CHIMP (https://github.com/edgarcosta/CHIMP) if you want to run this code
chi := DirichletCharacter("1156.1");
S:= CuspForms(chi, 2);
N := Newforms(S);
| Level: | \( N \) | \(=\) | \( 1156 = 2^{2} \cdot 17^{2} \) |
| Weight: | \( k \) | \(=\) | \( 2 \) |
| Character orbit: | \([\chi]\) | \(=\) | 1156.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: | \(9.23070647366\) |
| Analytic rank: | \(0\) |
| Dimension: | \(4\) |
| Coefficient field: | \(\Q(\sqrt{2}, \sqrt{13})\) |
|
comment: defining polynomial
gp: f.mod \\ as an extension of the character field
|
|
| Defining polynomial: |
\( x^{4} - 2x^{3} - 9x^{2} + 10x - 1 \)
|
| Coefficient ring: | \(\Z[a_1, \ldots, a_{5}]\) |
| Coefficient ring index: | \( 2 \) |
| Twist minimal: | no (minimal twist has level 68) |
| 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 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
\( x^{4} - 2x^{3} - 9x^{2} + 10x - 1 \)
:
| \(\beta_{1}\) | \(=\) |
\( ( \nu^{3} + \nu^{2} - 11\nu - 8 ) / 5 \)
|
| \(\beta_{2}\) | \(=\) |
\( ( -2\nu^{3} + 3\nu^{2} + 17\nu - 9 ) / 5 \)
|
| \(\beta_{3}\) | \(=\) |
\( ( -4\nu^{3} + 6\nu^{2} + 44\nu - 23 ) / 5 \)
|
| \(\nu\) | \(=\) |
\( ( \beta_{3} - 2\beta_{2} + 1 ) / 2 \)
|
| \(\nu^{2}\) | \(=\) |
\( ( \beta_{3} + 4\beta _1 + 11 ) / 2 \)
|
| \(\nu^{3}\) | \(=\) |
\( 5\beta_{3} - 11\beta_{2} + 3\beta _1 + 8 \)
|
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 | −3.25662 | 0 | 1.41421 | 0 | −3.25662 | 0 | 7.60555 | 0 | ||||||||||||||||||||||||||||||
| 1.2 | 0 | −1.84240 | 0 | −1.41421 | 0 | −1.84240 | 0 | 0.394449 | 0 | |||||||||||||||||||||||||||||||
| 1.3 | 0 | 1.84240 | 0 | 1.41421 | 0 | 1.84240 | 0 | 0.394449 | 0 | |||||||||||||||||||||||||||||||
| 1.4 | 0 | 3.25662 | 0 | −1.41421 | 0 | 3.25662 | 0 | 7.60555 | 0 | |||||||||||||||||||||||||||||||
Atkin-Lehner signs
| \( p \) | Sign |
|---|---|
| \(2\) | \(-1\) |
| \(17\) | \(1\) |
Inner twists
| Char | Parity | Ord | Mult | Type |
|---|---|---|---|---|
| 1.a | even | 1 | 1 | trivial |
| 17.b | even | 2 | 1 | inner |
Twists
| By twisting character orbit | |||||||
|---|---|---|---|---|---|---|---|
| Char | Parity | Ord | Mult | Type | Twist | Min | Dim |
| 1.a | even | 1 | 1 | trivial | 1156.2.a.h | 4 | |
| 4.b | odd | 2 | 1 | 4624.2.a.bq | 4 | ||
| 17.b | even | 2 | 1 | inner | 1156.2.a.h | 4 | |
| 17.c | even | 4 | 2 | 1156.2.b.a | 4 | ||
| 17.d | even | 8 | 2 | 68.2.e.a | ✓ | 4 | |
| 17.d | even | 8 | 2 | 1156.2.e.c | 4 | ||
| 17.e | odd | 16 | 8 | 1156.2.h.e | 16 | ||
| 51.g | odd | 8 | 2 | 612.2.k.e | 4 | ||
| 68.d | odd | 2 | 1 | 4624.2.a.bq | 4 | ||
| 68.g | odd | 8 | 2 | 272.2.o.g | 4 | ||
| 85.k | odd | 8 | 2 | 1700.2.m.b | 4 | ||
| 85.m | even | 8 | 2 | 1700.2.o.c | 4 | ||
| 85.n | odd | 8 | 2 | 1700.2.m.a | 4 | ||
| 136.o | even | 8 | 2 | 1088.2.o.t | 4 | ||
| 136.p | odd | 8 | 2 | 1088.2.o.s | 4 | ||
| 204.p | even | 8 | 2 | 2448.2.be.u | 4 | ||
| By twisted newform orbit | |||||||
|---|---|---|---|---|---|---|---|
| Twist | Min | Dim | Char | Parity | Ord | Mult | Type |
| 68.2.e.a | ✓ | 4 | 17.d | even | 8 | 2 | |
| 272.2.o.g | 4 | 68.g | odd | 8 | 2 | ||
| 612.2.k.e | 4 | 51.g | odd | 8 | 2 | ||
| 1088.2.o.s | 4 | 136.p | odd | 8 | 2 | ||
| 1088.2.o.t | 4 | 136.o | even | 8 | 2 | ||
| 1156.2.a.h | 4 | 1.a | even | 1 | 1 | trivial | |
| 1156.2.a.h | 4 | 17.b | even | 2 | 1 | inner | |
| 1156.2.b.a | 4 | 17.c | even | 4 | 2 | ||
| 1156.2.e.c | 4 | 17.d | even | 8 | 2 | ||
| 1156.2.h.e | 16 | 17.e | odd | 16 | 8 | ||
| 1700.2.m.a | 4 | 85.n | odd | 8 | 2 | ||
| 1700.2.m.b | 4 | 85.k | odd | 8 | 2 | ||
| 1700.2.o.c | 4 | 85.m | even | 8 | 2 | ||
| 2448.2.be.u | 4 | 204.p | even | 8 | 2 | ||
| 4624.2.a.bq | 4 | 4.b | odd | 2 | 1 | ||
| 4624.2.a.bq | 4 | 68.d | odd | 2 | 1 | ||
Hecke kernels
This newform subspace can be constructed as the kernel of the linear operator
\( T_{3}^{4} - 14T_{3}^{2} + 36 \)
acting on \(S_{2}^{\mathrm{new}}(\Gamma_0(1156))\).
Hecke characteristic polynomials
| $p$ | $F_p(T)$ |
|---|---|
| $2$ |
\( T^{4} \)
|
| $3$ |
\( T^{4} - 14T^{2} + 36 \)
|
| $5$ |
\( (T^{2} - 2)^{2} \)
|
| $7$ |
\( T^{4} - 14T^{2} + 36 \)
|
| $11$ |
\( T^{4} - 22T^{2} + 4 \)
|
| $13$ |
\( (T^{2} - 2 T - 12)^{2} \)
|
| $17$ |
\( T^{4} \)
|
| $19$ |
\( (T^{2} + 6 T - 4)^{2} \)
|
| $23$ |
\( T^{4} - 38T^{2} + 36 \)
|
| $29$ |
\( T^{4} - 68T^{2} + 324 \)
|
| $31$ |
\( T^{4} - 38T^{2} + 36 \)
|
| $37$ |
\( (T^{2} - 18)^{2} \)
|
| $41$ |
\( (T^{2} - 2)^{2} \)
|
| $43$ |
\( (T^{2} - 14 T + 36)^{2} \)
|
| $47$ |
\( (T - 4)^{4} \)
|
| $53$ |
\( (T^{2} - 4 T - 48)^{2} \)
|
| $59$ |
\( (T^{2} - 10 T + 12)^{2} \)
|
| $61$ |
\( T^{4} - 212 T^{2} + 10404 \)
|
| $67$ |
\( (T^{2} - 4 T - 48)^{2} \)
|
| $71$ |
\( T^{4} - 142T^{2} + 2116 \)
|
| $73$ |
\( (T^{2} - 98)^{2} \)
|
| $79$ |
\( T^{4} - 22T^{2} + 4 \)
|
| $83$ |
\( (T^{2} - 14 T - 68)^{2} \)
|
| $89$ |
\( (T^{2} - 6 T - 108)^{2} \)
|
| $97$ |
\( T^{4} - 116T^{2} + 36 \)
|
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