Newspace parameters
comment: Compute space of new eigenforms
[N,k,chi] = [57,4,Mod(56,57)]
mf = mfinit([N,k,chi],0)
lf = mfeigenbasis(mf)
from sage.modular.dirichlet import DirichletCharacter
H = DirichletGroup(57, base_ring=CyclotomicField(2))
chi = DirichletCharacter(H, H._module([1, 1]))
N = Newforms(chi, 4, names="a")
//Please install CHIMP (https://github.com/edgarcosta/CHIMP) if you want to run this code
chi := DirichletCharacter("57.56");
S:= CuspForms(chi, 4);
N := Newforms(S);
| Level: | \( N \) | \(=\) | \( 57 = 3 \cdot 19 \) |
| Weight: | \( k \) | \(=\) | \( 4 \) |
| Character orbit: | \([\chi]\) | \(=\) | 57.d (of order \(2\), degree \(1\), 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: | \(3.36310887033\) |
| Analytic rank: | \(0\) |
| Dimension: | \(4\) |
| Coefficient field: | \(\Q(\sqrt{-10}, \sqrt{17})\) |
|
comment: defining polynomial
gp: f.mod \\ as an extension of the character field
|
|
| Defining polynomial: |
\( x^{4} - 2x^{3} + 13x^{2} - 12x + 206 \)
|
| Coefficient ring: | \(\Z[a_1, a_2, a_3]\) |
| Coefficient ring index: | \( 2^{2} \) |
| Twist minimal: | yes |
| 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
\( x^{4} - 2x^{3} + 13x^{2} - 12x + 206 \)
:
| \(\beta_{1}\) | \(=\) |
\( ( 2\nu^{3} - 3\nu^{2} + 53\nu - 26 ) / 57 \)
|
| \(\beta_{2}\) | \(=\) |
\( ( -4\nu^{3} + 6\nu^{2} + 8\nu - 5 ) / 57 \)
|
| \(\beta_{3}\) | \(=\) |
\( \nu^{2} - \nu + 6 \)
|
| \(\nu\) | \(=\) |
\( ( \beta_{2} + 2\beta _1 + 1 ) / 2 \)
|
| \(\nu^{2}\) | \(=\) |
\( ( 2\beta_{3} + \beta_{2} + 2\beta _1 - 11 ) / 2 \)
|
| \(\nu^{3}\) | \(=\) |
\( ( 3\beta_{3} - 25\beta_{2} + 7\beta _1 - 17 ) / 2 \)
|
Character values
We give the values of \(\chi\) on generators for \(\left(\mathbb{Z}/57\mathbb{Z}\right)^\times\).
| \(n\) | \(20\) | \(40\) |
| \(\chi(n)\) | \(-1\) | \(-1\) |
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 | \(\iota_m(\nu)\) | \( a_{2} \) | \( a_{3} \) | \( a_{4} \) | \( a_{5} \) | \( a_{6} \) | \( a_{7} \) | \( a_{8} \) | \( a_{9} \) | \( a_{10} \) | ||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 56.1 |
|
−4.12311 | −4.12311 | − | 3.16228i | 9.00000 | − | 13.0384i | 17.0000 | + | 13.0384i | −20.0000 | −4.12311 | 7.00000 | + | 26.0768i | 53.7587i | |||||||||||||||||||||||
| 56.2 | −4.12311 | −4.12311 | + | 3.16228i | 9.00000 | 13.0384i | 17.0000 | − | 13.0384i | −20.0000 | −4.12311 | 7.00000 | − | 26.0768i | − | 53.7587i | ||||||||||||||||||||||||
| 56.3 | 4.12311 | 4.12311 | − | 3.16228i | 9.00000 | 13.0384i | 17.0000 | − | 13.0384i | −20.0000 | 4.12311 | 7.00000 | − | 26.0768i | 53.7587i | |||||||||||||||||||||||||
| 56.4 | 4.12311 | 4.12311 | + | 3.16228i | 9.00000 | − | 13.0384i | 17.0000 | + | 13.0384i | −20.0000 | 4.12311 | 7.00000 | + | 26.0768i | − | 53.7587i | |||||||||||||||||||||||
Inner twists
| Char | Parity | Ord | Mult | Type |
|---|---|---|---|---|
| 1.a | even | 1 | 1 | trivial |
| 3.b | odd | 2 | 1 | inner |
| 19.b | odd | 2 | 1 | inner |
| 57.d | even | 2 | 1 | inner |
Twists
| By twisting character orbit | |||||||
|---|---|---|---|---|---|---|---|
| Char | Parity | Ord | Mult | Type | Twist | Min | Dim |
| 1.a | even | 1 | 1 | trivial | 57.4.d.b | ✓ | 4 |
| 3.b | odd | 2 | 1 | inner | 57.4.d.b | ✓ | 4 |
| 19.b | odd | 2 | 1 | inner | 57.4.d.b | ✓ | 4 |
| 57.d | even | 2 | 1 | inner | 57.4.d.b | ✓ | 4 |
| By twisted newform orbit | |||||||
|---|---|---|---|---|---|---|---|
| Twist | Min | Dim | Char | Parity | Ord | Mult | Type |
| 57.4.d.b | ✓ | 4 | 1.a | even | 1 | 1 | trivial |
| 57.4.d.b | ✓ | 4 | 3.b | odd | 2 | 1 | inner |
| 57.4.d.b | ✓ | 4 | 19.b | odd | 2 | 1 | inner |
| 57.4.d.b | ✓ | 4 | 57.d | even | 2 | 1 | inner |
Hecke kernels
This newform subspace can be constructed as the kernel of the linear operator
\( T_{2}^{2} - 17 \)
acting on \(S_{4}^{\mathrm{new}}(57, [\chi])\).
Hecke characteristic polynomials
| $p$ | $F_p(T)$ |
|---|---|
| $2$ |
\( (T^{2} - 17)^{2} \)
|
| $3$ |
\( T^{4} - 14T^{2} + 729 \)
|
| $5$ |
\( (T^{2} + 170)^{2} \)
|
| $7$ |
\( (T + 20)^{4} \)
|
| $11$ |
\( (T^{2} + 2720)^{2} \)
|
| $13$ |
\( (T^{2} + 250)^{2} \)
|
| $17$ |
\( (T^{2} + 6120)^{2} \)
|
| $19$ |
\( (T^{2} - 114 T + 6859)^{2} \)
|
| $23$ |
\( (T^{2} + 8330)^{2} \)
|
| $29$ |
\( (T^{2} - 42500)^{2} \)
|
| $31$ |
\( (T^{2} + 1690)^{2} \)
|
| $37$ |
\( (T^{2} + 47610)^{2} \)
|
| $41$ |
\( (T^{2} - 27200)^{2} \)
|
| $43$ |
\( (T + 350)^{4} \)
|
| $47$ |
\( (T^{2} + 89930)^{2} \)
|
| $53$ |
\( (T^{2} - 103428)^{2} \)
|
| $59$ |
\( (T^{2} - 6800)^{2} \)
|
| $61$ |
\( (T - 362)^{4} \)
|
| $67$ |
\( (T^{2} + 876160)^{2} \)
|
| $71$ |
\( (T^{2} - 61200)^{2} \)
|
| $73$ |
\( (T + 1020)^{4} \)
|
| $79$ |
\( (T^{2} + 1576090)^{2} \)
|
| $83$ |
\( (T^{2} + 196520)^{2} \)
|
| $89$ |
\( (T^{2} - 137700)^{2} \)
|
| $97$ |
\( (T^{2} + 316840)^{2} \)
|
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