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: | 3.3.4481.1 |
|
comment: defining polynomial
gp: f.mod \\ as an extension of the character field
|
|
| Defining polynomial: |
\( x^{3} - 17x - 8 \)
|
| Coefficient ring: | \(\Z[a_1, \ldots, a_{5}]\) |
| Coefficient ring index: | \( 2^{3} \) |
| 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
\( x^{3} - 17x - 8 \)
:
| \(\beta_{1}\) | \(=\) |
\( 2\nu \)
|
| \(\beta_{2}\) | \(=\) |
\( 2\nu^{2} - 2\nu - 23 \)
|
| \(\nu\) | \(=\) |
\( ( \beta_1 ) / 2 \)
|
| \(\nu^{2}\) | \(=\) |
\( ( \beta_{2} + \beta _1 + 23 ) / 2 \)
|
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 | −7.68170 | 0 | −18.6859 | 0 | 10.3225 | 0 | 32.0084 | 0 | |||||||||||||||||||||||||||
| 1.2 | 0 | 1.95394 | 0 | 18.5450 | 0 | −7.63711 | 0 | −23.1821 | 0 | ||||||||||||||||||||||||||||
| 1.3 | 0 | 8.72775 | 0 | −10.8591 | 0 | 35.3146 | 0 | 49.1737 | 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.t | 3 | |
| 4.b | odd | 2 | 1 | 1856.4.a.q | 3 | ||
| 8.b | even | 2 | 1 | 464.4.a.h | 3 | ||
| 8.d | odd | 2 | 1 | 232.4.a.a | ✓ | 3 | |
| 24.f | even | 2 | 1 | 2088.4.a.a | 3 | ||
| By twisted newform orbit | |||||||
|---|---|---|---|---|---|---|---|
| Twist | Min | Dim | Char | Parity | Ord | Mult | Type |
| 232.4.a.a | ✓ | 3 | 8.d | odd | 2 | 1 | |
| 464.4.a.h | 3 | 8.b | even | 2 | 1 | ||
| 1856.4.a.q | 3 | 4.b | odd | 2 | 1 | ||
| 1856.4.a.t | 3 | 1.a | even | 1 | 1 | trivial | |
| 2088.4.a.a | 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 \(S_{4}^{\mathrm{new}}(\Gamma_0(1856))\):
|
\( T_{3}^{3} - 3T_{3}^{2} - 65T_{3} + 131 \)
|
|
\( T_{5}^{3} + 11T_{5}^{2} - 345T_{5} - 3763 \)
|
|
\( T_{7}^{3} - 38T_{7}^{2} + 16T_{7} + 2784 \)
|
Hecke characteristic polynomials
| $p$ | $F_p(T)$ |
|---|---|
| $2$ |
\( T^{3} \)
|
| $3$ |
\( T^{3} - 3 T^{2} + \cdots + 131 \)
|
| $5$ |
\( T^{3} + 11 T^{2} + \cdots - 3763 \)
|
| $7$ |
\( T^{3} - 38 T^{2} + \cdots + 2784 \)
|
| $11$ |
\( T^{3} - 65 T^{2} + \cdots + 17161 \)
|
| $13$ |
\( T^{3} + 29 T^{2} + \cdots + 11819 \)
|
| $17$ |
\( T^{3} - 244 T^{2} + \cdots - 462496 \)
|
| $19$ |
\( T^{3} - 312 T^{2} + \cdots - 856448 \)
|
| $23$ |
\( T^{3} - 24 T^{2} + \cdots - 76432 \)
|
| $29$ |
\( (T - 29)^{3} \)
|
| $31$ |
\( T^{3} + 249 T^{2} + \cdots + 3931 \)
|
| $37$ |
\( T^{3} + 200 T^{2} + \cdots + 732672 \)
|
| $41$ |
\( T^{3} + 470 T^{2} + \cdots + 670464 \)
|
| $43$ |
\( T^{3} - 97 T^{2} + \cdots + 15326777 \)
|
| $47$ |
\( T^{3} + 377 T^{2} + \cdots - 2208837 \)
|
| $53$ |
\( T^{3} + 1007 T^{2} + \cdots - 67774943 \)
|
| $59$ |
\( T^{3} + 364 T^{2} + \cdots - 91904896 \)
|
| $61$ |
\( T^{3} - 524 T^{2} + \cdots + 68889888 \)
|
| $67$ |
\( T^{3} + 820 T^{2} + \cdots - 521984 \)
|
| $71$ |
\( T^{3} - 782 T^{2} + \cdots - 10922248 \)
|
| $73$ |
\( T^{3} - 1620 T^{2} + \cdots - 75323392 \)
|
| $79$ |
\( T^{3} + 427 T^{2} + \cdots + 63730809 \)
|
| $83$ |
\( T^{3} - 1520 T^{2} + \cdots + 77896912 \)
|
| $89$ |
\( T^{3} + 2474 T^{2} + \cdots + 261171936 \)
|
| $97$ |
\( T^{3} + 170 T^{2} + \cdots + 692649728 \)
|
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