Newspace parameters
comment: Compute space of new eigenforms
[N,k,chi] = [15,2,Mod(1,15)]
mf = mfinit([N,k,chi],0)
lf = mfeigenbasis(mf)
from sage.modular.dirichlet import DirichletCharacter
H = DirichletGroup(15, base_ring=CyclotomicField(2))
chi = DirichletCharacter(H, H._module([0, 0]))
N = Newforms(chi, 2, names="a")
//Please install CHIMP (https://github.com/edgarcosta/CHIMP) if you want to run this code
chi := DirichletCharacter("15.1");
S:= CuspForms(chi, 2);
N := Newforms(S);
| Level: | \( N \) | \(=\) | \( 15 = 3 \cdot 5 \) |
| Weight: | \( k \) | \(=\) | \( 2 \) |
| Character orbit: | \([\chi]\) | \(=\) | 15.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: | \(0.119775603032\) |
| Analytic rank: | \(0\) |
| Dimension: | \(1\) |
| Coefficient field: | \(\mathbb{Q}\) |
| Coefficient ring: | \(\mathbb{Z}\) |
| Coefficient ring index: | \( 1 \) |
| 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)
Expression as an eta quotient
\(f(z) = \eta(z)\eta(3z)\eta(5z)\eta(15z)=q\prod_{n=1}^\infty(1 - q^{n})^{}(1 - q^{3n})^{}(1 - q^{5n})^{}(1 - q^{15n})^{}\)
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 |
|
−1.00000 | −1.00000 | −1.00000 | 1.00000 | 1.00000 | 0 | 3.00000 | 1.00000 | −1.00000 | |||||||||||||||||||||
Atkin-Lehner signs
| \( p \) | Sign |
|---|---|
| \(3\) | \(1\) |
| \(5\) | \(-1\) |
Inner twists
This newform does not admit any (nontrivial) inner twists.
Twists
Hecke kernels
This newform subspace is the entire newspace \(S_{2}^{\mathrm{new}}(\Gamma_0(15))\).
Hecke characteristic polynomials
| $p$ | $F_p(T)$ |
|---|---|
| $2$ |
\( T + 1 \)
|
| $3$ |
\( T + 1 \)
|
| $5$ |
\( T - 1 \)
|
| $7$ |
\( T \)
|
| $11$ |
\( T + 4 \)
|
| $13$ |
\( T + 2 \)
|
| $17$ |
\( T - 2 \)
|
| $19$ |
\( T - 4 \)
|
| $23$ |
\( T \)
|
| $29$ |
\( T + 2 \)
|
| $31$ |
\( T \)
|
| $37$ |
\( T + 10 \)
|
| $41$ |
\( T - 10 \)
|
| $43$ |
\( T - 4 \)
|
| $47$ |
\( T - 8 \)
|
| $53$ |
\( T + 10 \)
|
| $59$ |
\( T + 4 \)
|
| $61$ |
\( T + 2 \)
|
| $67$ |
\( T - 12 \)
|
| $71$ |
\( T + 8 \)
|
| $73$ |
\( T - 10 \)
|
| $79$ |
\( T \)
|
| $83$ |
\( T - 12 \)
|
| $89$ |
\( T + 6 \)
|
| $97$ |
\( T - 2 \)
|
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