Newspace parameters
comment: Compute space of new eigenforms
[N,k,chi] = [784,6,Mod(1,784)]
mf = mfinit([N,k,chi],0)
lf = mfeigenbasis(mf)
from sage.modular.dirichlet import DirichletCharacter
H = DirichletGroup(784, base_ring=CyclotomicField(2))
chi = DirichletCharacter(H, H._module([0, 0, 0]))
N = Newforms(chi, 6, names="a")
//Please install CHIMP (https://github.com/edgarcosta/CHIMP) if you want to run this code
chi := DirichletCharacter("784.1");
S:= CuspForms(chi, 6);
N := Newforms(S);
| Level: | \( N \) | \(=\) | \( 784 = 2^{4} \cdot 7^{2} \) |
| Weight: | \( k \) | \(=\) | \( 6 \) |
| Character orbit: | \([\chi]\) | \(=\) | 784.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: | \(125.740914733\) |
| Analytic rank: | \(1\) |
| Dimension: | \(2\) |
| Coefficient field: | \(\Q(\sqrt{109}) \) |
|
comment: defining polynomial
gp: f.mod \\ as an extension of the character field
|
|
| Defining polynomial: |
\( x^{2} - x - 27 \)
|
| Coefficient ring: | \(\Z[a_1, a_2, a_3]\) |
| Coefficient ring index: | \( 2 \) |
| Twist minimal: | no (minimal twist has level 28) |
| 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 \(\beta = \sqrt{109}\). We also show the integral \(q\)-expansion of the trace form.
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 | 3.55969 | 0 | 41.6418 | 0 | 0 | 0 | −230.329 | 0 | ||||||||||||||||||||||||
| 1.2 | 0 | 24.4403 | 0 | −83.6418 | 0 | 0 | 0 | 354.329 | 0 | |||||||||||||||||||||||||
Atkin-Lehner signs
| \( p \) | Sign |
|---|---|
| \(2\) | \(-1\) |
| \(7\) | \(-1\) |
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 | 784.6.a.bd | 2 | |
| 4.b | odd | 2 | 1 | 196.6.a.h | 2 | ||
| 7.b | odd | 2 | 1 | 784.6.a.o | 2 | ||
| 7.d | odd | 6 | 2 | 112.6.i.e | 4 | ||
| 28.d | even | 2 | 1 | 196.6.a.j | 2 | ||
| 28.f | even | 6 | 2 | 28.6.e.b | ✓ | 4 | |
| 28.g | odd | 6 | 2 | 196.6.e.k | 4 | ||
| 84.j | odd | 6 | 2 | 252.6.k.d | 4 | ||
| By twisted newform orbit | |||||||
|---|---|---|---|---|---|---|---|
| Twist | Min | Dim | Char | Parity | Ord | Mult | Type |
| 28.6.e.b | ✓ | 4 | 28.f | even | 6 | 2 | |
| 112.6.i.e | 4 | 7.d | odd | 6 | 2 | ||
| 196.6.a.h | 2 | 4.b | odd | 2 | 1 | ||
| 196.6.a.j | 2 | 28.d | even | 2 | 1 | ||
| 196.6.e.k | 4 | 28.g | odd | 6 | 2 | ||
| 252.6.k.d | 4 | 84.j | odd | 6 | 2 | ||
| 784.6.a.o | 2 | 7.b | odd | 2 | 1 | ||
| 784.6.a.bd | 2 | 1.a | even | 1 | 1 | trivial | |
Hecke kernels
This newform subspace can be constructed as the kernel of the linear operator
\( T_{3}^{2} - 28T_{3} + 87 \)
acting on \(S_{6}^{\mathrm{new}}(\Gamma_0(784))\).
Hecke characteristic polynomials
| $p$ | $F_p(T)$ |
|---|---|
| $2$ |
\( T^{2} \)
|
| $3$ |
\( T^{2} - 28T + 87 \)
|
| $5$ |
\( T^{2} + 42T - 3483 \)
|
| $7$ |
\( T^{2} \)
|
| $11$ |
\( T^{2} + 660T + 60831 \)
|
| $13$ |
\( T^{2} - 644T - 147452 \)
|
| $17$ |
\( T^{2} - 210T - 51759 \)
|
| $19$ |
\( T^{2} - 3724 T + 3458215 \)
|
| $23$ |
\( T^{2} + 24T - 2355237 \)
|
| $29$ |
\( T^{2} - 5532 T - 4654908 \)
|
| $31$ |
\( T^{2} - 2800 T - 19238429 \)
|
| $37$ |
\( T^{2} + 13238 T + 34389637 \)
|
| $41$ |
\( T^{2} + 4116 T - 68342940 \)
|
| $43$ |
\( (T + 6716)^{2} \)
|
| $47$ |
\( T^{2} - 8064 T - 522391437 \)
|
| $53$ |
\( T^{2} + 53958 T + 695371797 \)
|
| $59$ |
\( T^{2} - 36036 T - 17996337 \)
|
| $61$ |
\( T^{2} + \cdots + 1761336253 \)
|
| $67$ |
\( T^{2} - 2660 T - 38657129 \)
|
| $71$ |
\( T^{2} + 71568 T - 491520960 \)
|
| $73$ |
\( T^{2} + \cdots - 3148663319 \)
|
| $79$ |
\( T^{2} + \cdots - 4176683117 \)
|
| $83$ |
\( T^{2} + \cdots - 1440901872 \)
|
| $89$ |
\( T^{2} + \cdots + 6608830905 \)
|
| $97$ |
\( T^{2} + \cdots - 5263077500 \)
|
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