Newspace parameters
comment: Compute space of new eigenforms
[N,k,chi] = [2736,3,Mod(721,2736)]
mf = mfinit([N,k,chi],0)
lf = mfeigenbasis(mf)
from sage.modular.dirichlet import DirichletCharacter
H = DirichletGroup(2736, base_ring=CyclotomicField(2))
chi = DirichletCharacter(H, H._module([0, 0, 0, 1]))
N = Newforms(chi, 3, names="a")
//Please install CHIMP (https://github.com/edgarcosta/CHIMP) if you want to run this code
chi := DirichletCharacter("2736.721");
S:= CuspForms(chi, 3);
N := Newforms(S);
| Level: | \( N \) | \(=\) | \( 2736 = 2^{4} \cdot 3^{2} \cdot 19 \) |
| Weight: | \( k \) | \(=\) | \( 3 \) |
| Character orbit: | \([\chi]\) | \(=\) | 2736.o (of order \(2\), degree \(1\), not 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: | \(74.5506003290\) |
| Analytic rank: | \(0\) |
| Dimension: | \(4\) |
| Coefficient field: | \(\Q(\sqrt{-7}, \sqrt{10})\) |
|
comment: defining polynomial
gp: f.mod \\ as an extension of the character field
|
|
| Defining polynomial: |
\( x^{4} - 2x^{3} - 15x^{2} + 16x + 134 \)
|
| Coefficient ring: | \(\Z[a_1, \ldots, a_{29}]\) |
| Coefficient ring index: | \( 2^{7} \) |
| Twist minimal: | no (minimal twist has level 171) |
| 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
\( x^{4} - 2x^{3} - 15x^{2} + 16x + 134 \)
:
| \(\beta_{1}\) | \(=\) |
\( ( -4\nu^{3} + 6\nu^{2} + 110\nu - 56 ) / 47 \)
|
| \(\beta_{2}\) | \(=\) |
\( ( 32\nu^{3} - 48\nu^{2} - 128\nu + 72 ) / 47 \)
|
| \(\beta_{3}\) | \(=\) |
\( 2\nu^{2} - 2\nu - 16 \)
|
| \(\nu\) | \(=\) |
\( ( \beta_{2} + 8\beta _1 + 8 ) / 16 \)
|
| \(\nu^{2}\) | \(=\) |
\( ( 8\beta_{3} + \beta_{2} + 8\beta _1 + 136 ) / 16 \)
|
| \(\nu^{3}\) | \(=\) |
\( ( 12\beta_{3} + 29\beta_{2} + 44\beta _1 + 200 ) / 16 \)
|
Character values
We give the values of \(\chi\) on generators for \(\left(\mathbb{Z}/2736\mathbb{Z}\right)^\times\).
| \(n\) | \(1009\) | \(1217\) | \(1711\) | \(2053\) |
| \(\chi(n)\) | \(-1\) | \(1\) | \(1\) | \(1\) |
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 | \(\iota_m(\nu)\) | \( a_{2} \) | \( a_{3} \) | \( a_{4} \) | \( a_{5} \) | \( a_{6} \) | \( a_{7} \) | \( a_{8} \) | \( a_{9} \) | \( a_{10} \) | ||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 721.1 |
|
0 | 0 | 0 | −6.32456 | 0 | 2.00000 | 0 | 0 | 0 | ||||||||||||||||||||||||||||||
| 721.2 | 0 | 0 | 0 | −6.32456 | 0 | 2.00000 | 0 | 0 | 0 | |||||||||||||||||||||||||||||||
| 721.3 | 0 | 0 | 0 | 6.32456 | 0 | 2.00000 | 0 | 0 | 0 | |||||||||||||||||||||||||||||||
| 721.4 | 0 | 0 | 0 | 6.32456 | 0 | 2.00000 | 0 | 0 | 0 | |||||||||||||||||||||||||||||||
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 | 2736.3.o.j | 4 | |
| 3.b | odd | 2 | 1 | inner | 2736.3.o.j | 4 | |
| 4.b | odd | 2 | 1 | 171.3.c.e | ✓ | 4 | |
| 12.b | even | 2 | 1 | 171.3.c.e | ✓ | 4 | |
| 19.b | odd | 2 | 1 | inner | 2736.3.o.j | 4 | |
| 57.d | even | 2 | 1 | inner | 2736.3.o.j | 4 | |
| 76.d | even | 2 | 1 | 171.3.c.e | ✓ | 4 | |
| 228.b | odd | 2 | 1 | 171.3.c.e | ✓ | 4 | |
| By twisted newform orbit | |||||||
|---|---|---|---|---|---|---|---|
| Twist | Min | Dim | Char | Parity | Ord | Mult | Type |
| 171.3.c.e | ✓ | 4 | 4.b | odd | 2 | 1 | |
| 171.3.c.e | ✓ | 4 | 12.b | even | 2 | 1 | |
| 171.3.c.e | ✓ | 4 | 76.d | even | 2 | 1 | |
| 171.3.c.e | ✓ | 4 | 228.b | odd | 2 | 1 | |
| 2736.3.o.j | 4 | 1.a | even | 1 | 1 | trivial | |
| 2736.3.o.j | 4 | 3.b | odd | 2 | 1 | inner | |
| 2736.3.o.j | 4 | 19.b | odd | 2 | 1 | inner | |
| 2736.3.o.j | 4 | 57.d | even | 2 | 1 | inner | |
Hecke kernels
This newform subspace can be constructed as the intersection of the kernels of the following linear operators acting on \(S_{3}^{\mathrm{new}}(2736, [\chi])\):
|
\( T_{5}^{2} - 40 \)
|
|
\( T_{7} - 2 \)
|
Hecke characteristic polynomials
| $p$ | $F_p(T)$ |
|---|---|
| $2$ |
\( T^{4} \)
|
| $3$ |
\( T^{4} \)
|
| $5$ |
\( (T^{2} - 40)^{2} \)
|
| $7$ |
\( (T - 2)^{4} \)
|
| $11$ |
\( (T^{2} - 160)^{2} \)
|
| $13$ |
\( (T^{2} + 280)^{2} \)
|
| $17$ |
\( T^{4} \)
|
| $19$ |
\( (T^{2} - 18 T + 361)^{2} \)
|
| $23$ |
\( (T^{2} - 40)^{2} \)
|
| $29$ |
\( (T^{2} + 448)^{2} \)
|
| $31$ |
\( (T^{2} + 280)^{2} \)
|
| $37$ |
\( (T^{2} + 2520)^{2} \)
|
| $41$ |
\( (T^{2} + 448)^{2} \)
|
| $43$ |
\( (T + 34)^{4} \)
|
| $47$ |
\( (T^{2} - 6760)^{2} \)
|
| $53$ |
\( (T^{2} + 4032)^{2} \)
|
| $59$ |
\( (T^{2} + 448)^{2} \)
|
| $61$ |
\( (T - 86)^{4} \)
|
| $67$ |
\( (T^{2} + 4480)^{2} \)
|
| $71$ |
\( (T^{2} + 16128)^{2} \)
|
| $73$ |
\( (T + 102)^{4} \)
|
| $79$ |
\( (T^{2} + 13720)^{2} \)
|
| $83$ |
\( (T^{2} - 640)^{2} \)
|
| $89$ |
\( (T^{2} + 16128)^{2} \)
|
| $97$ |
\( (T^{2} + 1120)^{2} \)
|
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