Newspace parameters
comment: Compute space of new eigenforms
[N,k,chi] = [1856,4,Mod(1,1856)]
mf = mfinit([N,k,chi],0)
lf = mfeigenbasis(mf)
from sage.modular.dirichlet import DirichletCharacter
H = DirichletGroup(1856, 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("1856.1");
S:= CuspForms(chi, 4);
N := Newforms(S);
| Level: | \( N \) | \(=\) | \( 1856 = 2^{6} \cdot 29 \) |
| Weight: | \( k \) | \(=\) | \( 4 \) |
| Character orbit: | \([\chi]\) | \(=\) | 1856.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: | \(109.507544971\) |
| Analytic rank: | \(0\) |
| Dimension: | \(3\) |
| Coefficient field: | 3.3.229.1 |
|
comment: defining polynomial
gp: f.mod \\ as an extension of the character field
|
|
| Defining polynomial: |
\( x^{3} - 4x - 1 \)
|
| Coefficient ring: | \(\Z[a_1, \ldots, a_{5}]\) |
| Coefficient ring index: | \( 2 \) |
| Twist minimal: | no (minimal twist has level 232) |
| 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 \(1,\beta_1,\beta_2\) 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
\( x^{3} - 4x - 1 \)
:
| \(\beta_{1}\) | \(=\) |
\( \nu^{2} + \nu - 3 \)
|
| \(\beta_{2}\) | \(=\) |
\( \nu^{2} - \nu - 3 \)
|
| \(\nu\) | \(=\) |
\( ( -\beta_{2} + \beta_1 ) / 2 \)
|
| \(\nu^{2}\) | \(=\) |
\( ( \beta_{2} + \beta _1 + 6 ) / 2 \)
|
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 | −5.97021 | 0 | 12.4882 | 0 | 28.6773 | 0 | 8.64344 | 0 | |||||||||||||||||||||||||||
| 1.2 | 0 | 2.92622 | 0 | −14.3315 | 0 | −16.8804 | 0 | −18.4372 | 0 | ||||||||||||||||||||||||||||
| 1.3 | 0 | 9.04399 | 0 | −2.15672 | 0 | −27.7969 | 0 | 54.7938 | 0 | ||||||||||||||||||||||||||||
Atkin-Lehner signs
| \( p \) | Sign |
|---|---|
| \(2\) | \(-1\) |
| \(29\) | \(-1\) |
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 | 1856.4.a.u | 3 | |
| 4.b | odd | 2 | 1 | 1856.4.a.p | 3 | ||
| 8.b | even | 2 | 1 | 464.4.a.g | 3 | ||
| 8.d | odd | 2 | 1 | 232.4.a.b | ✓ | 3 | |
| 24.f | even | 2 | 1 | 2088.4.a.b | 3 | ||
| By twisted newform orbit | |||||||
|---|---|---|---|---|---|---|---|
| Twist | Min | Dim | Char | Parity | Ord | Mult | Type |
| 232.4.a.b | ✓ | 3 | 8.d | odd | 2 | 1 | |
| 464.4.a.g | 3 | 8.b | even | 2 | 1 | ||
| 1856.4.a.p | 3 | 4.b | odd | 2 | 1 | ||
| 1856.4.a.u | 3 | 1.a | even | 1 | 1 | trivial | |
| 2088.4.a.b | 3 | 24.f | even | 2 | 1 | ||
Hecke kernels
This newform subspace can be constructed as the intersection of the kernels of the following linear operators acting on \(S_{4}^{\mathrm{new}}(\Gamma_0(1856))\):
|
\( T_{3}^{3} - 6T_{3}^{2} - 45T_{3} + 158 \)
|
|
\( T_{5}^{3} + 4T_{5}^{2} - 175T_{5} - 386 \)
|
|
\( T_{7}^{3} + 16T_{7}^{2} - 812T_{7} - 13456 \)
|
Hecke characteristic polynomials
| $p$ | $F_p(T)$ |
|---|---|
| $2$ |
\( T^{3} \)
|
| $3$ |
\( T^{3} - 6 T^{2} + \cdots + 158 \)
|
| $5$ |
\( T^{3} + 4 T^{2} + \cdots - 386 \)
|
| $7$ |
\( T^{3} + 16 T^{2} + \cdots - 13456 \)
|
| $11$ |
\( T^{3} + 2 T^{2} + \cdots - 106 \)
|
| $13$ |
\( T^{3} + 28 T^{2} + \cdots - 137518 \)
|
| $17$ |
\( T^{3} + 66 T^{2} + \cdots - 1696 \)
|
| $19$ |
\( T^{3} + 66 T^{2} + \cdots - 393632 \)
|
| $23$ |
\( T^{3} + 176 T^{2} + \cdots + 106688 \)
|
| $29$ |
\( (T - 29)^{3} \)
|
| $31$ |
\( T^{3} - 190 T^{2} + \cdots + 9505226 \)
|
| $37$ |
\( T^{3} + 442 T^{2} + \cdots - 10323328 \)
|
| $41$ |
\( T^{3} - 1162 T^{2} + \cdots - 53735864 \)
|
| $43$ |
\( T^{3} - 30 T^{2} + \cdots - 8035162 \)
|
| $47$ |
\( T^{3} - 738 T^{2} + \cdots - 10647458 \)
|
| $53$ |
\( T^{3} + 312 T^{2} + \cdots + 4921082 \)
|
| $59$ |
\( T^{3} - 44 T^{2} + \cdots - 849664 \)
|
| $61$ |
\( T^{3} + 54 T^{2} + \cdots - 87366816 \)
|
| $67$ |
\( T^{3} + 116 T^{2} + \cdots + 19023808 \)
|
| $71$ |
\( T^{3} - 1200 T^{2} + \cdots - 44065376 \)
|
| $73$ |
\( T^{3} + 1118 T^{2} + \cdots - 19620512 \)
|
| $79$ |
\( T^{3} - 2262 T^{2} + \cdots - 199598902 \)
|
| $83$ |
\( T^{3} + 1804 T^{2} + \cdots - 652294144 \)
|
| $89$ |
\( T^{3} + \cdots + 1024346504 \)
|
| $97$ |
\( T^{3} + \cdots + 1820417096 \)
|
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