Newspace parameters
comment: Compute space of new eigenforms
[N,k,chi] = [9,16,Mod(1,9)]
mf = mfinit([N,k,chi],0)
lf = mfeigenbasis(mf)
from sage.modular.dirichlet import DirichletCharacter
H = DirichletGroup(9, base_ring=CyclotomicField(2))
chi = DirichletCharacter(H, H._module([0]))
N = Newforms(chi, 16, names="a")
//Please install CHIMP (https://github.com/edgarcosta/CHIMP) if you want to run this code
chi := DirichletCharacter("9.1");
S:= CuspForms(chi, 16);
N := Newforms(S);
| Level: | \( N \) | \(=\) | \( 9 = 3^{2} \) |
| Weight: | \( k \) | \(=\) | \( 16 \) |
| Character orbit: | \([\chi]\) | \(=\) | 9.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: | \(12.8424154590\) |
| Analytic rank: | \(0\) |
| Dimension: | \(2\) |
| Coefficient field: | \(\Q(\sqrt{370}) \) |
|
comment: defining polynomial
gp: f.mod \\ as an extension of the character field
|
|
| Defining polynomial: |
\( x^{2} - 370 \)
|
| Coefficient ring: | \(\Z[a_1, a_2]\) |
| Coefficient ring index: | \( 2\cdot 3^{2} \) |
| Twist minimal: | yes |
| 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 \(\beta = 18\sqrt{370}\). 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 |
|
−346.237 | 0 | 87112.0 | −160654. | 0 | −2.59126e6 | −1.88159e7 | 0 | 5.56243e7 | ||||||||||||||||||||||||
| 1.2 | 346.237 | 0 | 87112.0 | 160654. | 0 | −2.59126e6 | 1.88159e7 | 0 | 5.56243e7 | |||||||||||||||||||||||||
Atkin-Lehner signs
| \( p \) | Sign |
|---|---|
| \(3\) | \(1\) |
Inner twists
| Char | Parity | Ord | Mult | Type |
|---|---|---|---|---|
| 1.a | even | 1 | 1 | trivial |
| 3.b | odd | 2 | 1 | inner |
Twists
| By twisting character orbit | |||||||
|---|---|---|---|---|---|---|---|
| Char | Parity | Ord | Mult | Type | Twist | Min | Dim |
| 1.a | even | 1 | 1 | trivial | 9.16.a.e | ✓ | 2 |
| 3.b | odd | 2 | 1 | inner | 9.16.a.e | ✓ | 2 |
| 4.b | odd | 2 | 1 | 144.16.a.t | 2 | ||
| 12.b | even | 2 | 1 | 144.16.a.t | 2 | ||
| By twisted newform orbit | |||||||
|---|---|---|---|---|---|---|---|
| Twist | Min | Dim | Char | Parity | Ord | Mult | Type |
| 9.16.a.e | ✓ | 2 | 1.a | even | 1 | 1 | trivial |
| 9.16.a.e | ✓ | 2 | 3.b | odd | 2 | 1 | inner |
| 144.16.a.t | 2 | 4.b | odd | 2 | 1 | ||
| 144.16.a.t | 2 | 12.b | even | 2 | 1 | ||
Hecke kernels
This newform subspace can be constructed as the kernel of the linear operator
\( T_{2}^{2} - 119880 \)
acting on \(S_{16}^{\mathrm{new}}(\Gamma_0(9))\).
Hecke characteristic polynomials
| $p$ | $F_p(T)$ |
|---|---|
| $2$ |
\( T^{2} - 119880 \)
|
| $3$ |
\( T^{2} \)
|
| $5$ |
\( T^{2} - 25809684480 \)
|
| $7$ |
\( (T + 2591260)^{2} \)
|
| $11$ |
\( T^{2} - 14\!\cdots\!00 \)
|
| $13$ |
\( (T + 77911990)^{2} \)
|
| $17$ |
\( T^{2} - 56\!\cdots\!20 \)
|
| $19$ |
\( (T + 976566184)^{2} \)
|
| $23$ |
\( T^{2} - 43\!\cdots\!80 \)
|
| $29$ |
\( T^{2} - 12\!\cdots\!00 \)
|
| $31$ |
\( (T - 162227927108)^{2} \)
|
| $37$ |
\( (T + 606605347330)^{2} \)
|
| $41$ |
\( T^{2} - 51\!\cdots\!00 \)
|
| $43$ |
\( (T - 1764832689560)^{2} \)
|
| $47$ |
\( T^{2} - 14\!\cdots\!80 \)
|
| $53$ |
\( T^{2} - 34\!\cdots\!20 \)
|
| $59$ |
\( T^{2} - 75\!\cdots\!00 \)
|
| $61$ |
\( (T - 31978275004262)^{2} \)
|
| $67$ |
\( (T - 126767977040)^{2} \)
|
| $71$ |
\( T^{2} - 21\!\cdots\!00 \)
|
| $73$ |
\( (T - 101136696626630)^{2} \)
|
| $79$ |
\( (T - 163797938010884)^{2} \)
|
| $83$ |
\( T^{2} - 95\!\cdots\!20 \)
|
| $89$ |
\( T^{2} - 45\!\cdots\!00 \)
|
| $97$ |
\( (T + 10\!\cdots\!10)^{2} \)
|
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