Newspace parameters
comment: Compute space of new eigenforms
[N,k,chi] = [1815,2,Mod(364,1815)]
mf = mfinit([N,k,chi],0)
lf = mfeigenbasis(mf)
from sage.modular.dirichlet import DirichletCharacter
H = DirichletGroup(1815, base_ring=CyclotomicField(2))
chi = DirichletCharacter(H, H._module([0, 1, 0]))
N = Newforms(chi, 2, names="a")
//Please install CHIMP (https://github.com/edgarcosta/CHIMP) if you want to run this code
chi := DirichletCharacter("1815.364");
S:= CuspForms(chi, 2);
N := Newforms(S);
| Level: | \( N \) | \(=\) | \( 1815 = 3 \cdot 5 \cdot 11^{2} \) |
| Weight: | \( k \) | \(=\) | \( 2 \) |
| Character orbit: | \([\chi]\) | \(=\) | 1815.c (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: | \(14.4928479669\) |
| Analytic rank: | \(0\) |
| Dimension: | \(8\) |
| Coefficient field: | \(\Q(\zeta_{24})\) |
|
comment: defining polynomial
gp: f.mod \\ as an extension of the character field
|
|
| Defining polynomial: |
\( x^{8} - x^{4} + 1 \)
|
| Coefficient ring: | \(\Z[a_1, \ldots, a_{7}]\) |
| Coefficient ring index: | \( 2^{4} \) |
| 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 \(1,\beta_1,\ldots,\beta_{7}\) for the coefficient ring described below. We also show the integral \(q\)-expansion of the trace form.
Basis of coefficient ring
| \(\beta_{1}\) | \(=\) |
\( \zeta_{24}^{3} \)
|
| \(\beta_{2}\) | \(=\) |
\( \zeta_{24}^{5} + \zeta_{24} \)
|
| \(\beta_{3}\) | \(=\) |
\( \zeta_{24}^{6} \)
|
| \(\beta_{4}\) | \(=\) |
\( 2\zeta_{24}^{4} - 1 \)
|
| \(\beta_{5}\) | \(=\) |
\( -\zeta_{24}^{5} + \zeta_{24} \)
|
| \(\beta_{6}\) | \(=\) |
\( -\zeta_{24}^{6} + 2\zeta_{24}^{2} \)
|
| \(\beta_{7}\) | \(=\) |
\( 2\zeta_{24}^{7} - \zeta_{24}^{3} \)
|
| \(\zeta_{24}\) | \(=\) |
\( ( \beta_{5} + \beta_{2} ) / 2 \)
|
| \(\zeta_{24}^{2}\) | \(=\) |
\( ( \beta_{6} + \beta_{3} ) / 2 \)
|
| \(\zeta_{24}^{3}\) | \(=\) |
\( \beta_1 \)
|
| \(\zeta_{24}^{4}\) | \(=\) |
\( ( \beta_{4} + 1 ) / 2 \)
|
| \(\zeta_{24}^{5}\) | \(=\) |
\( ( -\beta_{5} + \beta_{2} ) / 2 \)
|
| \(\zeta_{24}^{6}\) | \(=\) |
\( \beta_{3} \)
|
| \(\zeta_{24}^{7}\) | \(=\) |
\( ( \beta_{7} + \beta_1 ) / 2 \)
|
Character values
We give the values of \(\chi\) on generators for \(\left(\mathbb{Z}/1815\mathbb{Z}\right)^\times\).
| \(n\) | \(727\) | \(1211\) | \(1696\) |
| \(\chi(n)\) | \(-1\) | \(1\) | \(1\) |
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 | \(\iota_m(\nu)\) | \( a_{2} \) | \( a_{3} \) | \( a_{4} \) | \( a_{5} \) | \( a_{6} \) | \( a_{7} \) | \( a_{8} \) | \( a_{9} \) | \( a_{10} \) | ||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 364.1 |
|
− | 1.41421i | − | 1.00000i | 0 | −2.22474 | − | 0.224745i | −1.41421 | 1.73205i | − | 2.82843i | −1.00000 | −0.317837 | + | 3.14626i | |||||||||||||||||||||||||||||||||||
| 364.2 | − | 1.41421i | − | 1.00000i | 0 | 0.224745 | + | 2.22474i | −1.41421 | − | 1.73205i | − | 2.82843i | −1.00000 | 3.14626 | − | 0.317837i | |||||||||||||||||||||||||||||||||||
| 364.3 | − | 1.41421i | 1.00000i | 0 | −2.22474 | + | 0.224745i | 1.41421 | 1.73205i | − | 2.82843i | −1.00000 | 0.317837 | + | 3.14626i | |||||||||||||||||||||||||||||||||||||
| 364.4 | − | 1.41421i | 1.00000i | 0 | 0.224745 | − | 2.22474i | 1.41421 | − | 1.73205i | − | 2.82843i | −1.00000 | −3.14626 | − | 0.317837i | ||||||||||||||||||||||||||||||||||||
| 364.5 | 1.41421i | − | 1.00000i | 0 | −2.22474 | − | 0.224745i | 1.41421 | − | 1.73205i | 2.82843i | −1.00000 | 0.317837 | − | 3.14626i | |||||||||||||||||||||||||||||||||||||
| 364.6 | 1.41421i | − | 1.00000i | 0 | 0.224745 | + | 2.22474i | 1.41421 | 1.73205i | 2.82843i | −1.00000 | −3.14626 | + | 0.317837i | ||||||||||||||||||||||||||||||||||||||
| 364.7 | 1.41421i | 1.00000i | 0 | −2.22474 | + | 0.224745i | −1.41421 | − | 1.73205i | 2.82843i | −1.00000 | −0.317837 | − | 3.14626i | ||||||||||||||||||||||||||||||||||||||
| 364.8 | 1.41421i | 1.00000i | 0 | 0.224745 | − | 2.22474i | −1.41421 | 1.73205i | 2.82843i | −1.00000 | 3.14626 | + | 0.317837i | |||||||||||||||||||||||||||||||||||||||
Inner twists
| Char | Parity | Ord | Mult | Type |
|---|---|---|---|---|
| 1.a | even | 1 | 1 | trivial |
| 5.b | even | 2 | 1 | inner |
| 11.b | odd | 2 | 1 | inner |
| 55.d | odd | 2 | 1 | inner |
Twists
| By twisting character orbit | |||||||
|---|---|---|---|---|---|---|---|
| Char | Parity | Ord | Mult | Type | Twist | Min | Dim |
| 1.a | even | 1 | 1 | trivial | 1815.2.c.g | ✓ | 8 |
| 5.b | even | 2 | 1 | inner | 1815.2.c.g | ✓ | 8 |
| 5.c | odd | 4 | 1 | 9075.2.a.cr | 4 | ||
| 5.c | odd | 4 | 1 | 9075.2.a.cy | 4 | ||
| 11.b | odd | 2 | 1 | inner | 1815.2.c.g | ✓ | 8 |
| 55.d | odd | 2 | 1 | inner | 1815.2.c.g | ✓ | 8 |
| 55.e | even | 4 | 1 | 9075.2.a.cr | 4 | ||
| 55.e | even | 4 | 1 | 9075.2.a.cy | 4 | ||
| By twisted newform orbit | |||||||
|---|---|---|---|---|---|---|---|
| Twist | Min | Dim | Char | Parity | Ord | Mult | Type |
| 1815.2.c.g | ✓ | 8 | 1.a | even | 1 | 1 | trivial |
| 1815.2.c.g | ✓ | 8 | 5.b | even | 2 | 1 | inner |
| 1815.2.c.g | ✓ | 8 | 11.b | odd | 2 | 1 | inner |
| 1815.2.c.g | ✓ | 8 | 55.d | odd | 2 | 1 | inner |
| 9075.2.a.cr | 4 | 5.c | odd | 4 | 1 | ||
| 9075.2.a.cr | 4 | 55.e | even | 4 | 1 | ||
| 9075.2.a.cy | 4 | 5.c | odd | 4 | 1 | ||
| 9075.2.a.cy | 4 | 55.e | even | 4 | 1 | ||
Hecke kernels
This newform subspace can be constructed as the intersection of the kernels of the following linear operators acting on \(S_{2}^{\mathrm{new}}(1815, [\chi])\):
|
\( T_{2}^{2} + 2 \)
|
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\( T_{19}^{2} - 3 \)
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Hecke characteristic polynomials
| $p$ | $F_p(T)$ |
|---|---|
| $2$ |
\( (T^{2} + 2)^{4} \)
|
| $3$ |
\( (T^{2} + 1)^{4} \)
|
| $5$ |
\( (T^{4} + 4 T^{3} + 8 T^{2} + \cdots + 25)^{2} \)
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| $7$ |
\( (T^{2} + 3)^{4} \)
|
| $11$ |
\( T^{8} \)
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| $13$ |
\( (T^{4} + 40 T^{2} + 16)^{2} \)
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| $17$ |
\( (T^{4} + 28 T^{2} + 100)^{2} \)
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| $19$ |
\( (T^{2} - 3)^{4} \)
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| $23$ |
\( (T^{2} + 4)^{4} \)
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| $29$ |
\( (T^{4} - 100 T^{2} + 2116)^{2} \)
|
| $31$ |
\( (T^{2} + 6 T - 15)^{4} \)
|
| $37$ |
\( (T^{4} + 50 T^{2} + 529)^{2} \)
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| $41$ |
\( (T^{4} - 88 T^{2} + 400)^{2} \)
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| $43$ |
\( (T^{2} + 32)^{4} \)
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| $47$ |
\( (T^{2} + 54)^{4} \)
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| $53$ |
\( (T^{2} + 100)^{4} \)
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| $59$ |
\( (T^{2} - 150)^{4} \)
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| $61$ |
\( (T^{4} - 198 T^{2} + 2025)^{2} \)
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| $67$ |
\( (T^{4} + 210 T^{2} + 3249)^{2} \)
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| $71$ |
\( (T^{2} + 12 T + 30)^{4} \)
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| $73$ |
\( (T^{4} + 198 T^{2} + 2025)^{2} \)
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| $79$ |
\( (T^{4} - 150 T^{2} + 4761)^{2} \)
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| $83$ |
\( (T^{2} + 162)^{4} \)
|
| $89$ |
\( (T^{2} - 12 T - 18)^{4} \)
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| $97$ |
\( (T^{2} + 25)^{4} \)
|
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