Newspace parameters
comment: Compute space of new eigenforms
[N,k,chi] = [2805,2,Mod(1,2805)]
mf = mfinit([N,k,chi],0)
lf = mfeigenbasis(mf)
from sage.modular.dirichlet import DirichletCharacter
H = DirichletGroup(2805, base_ring=CyclotomicField(2))
chi = DirichletCharacter(H, H._module([0, 0, 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("2805.1");
S:= CuspForms(chi, 2);
N := Newforms(S);
| Level: | \( N \) | \(=\) | \( 2805 = 3 \cdot 5 \cdot 11 \cdot 17 \) |
| Weight: | \( k \) | \(=\) | \( 2 \) |
| Character orbit: | \([\chi]\) | \(=\) | 2805.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: | \(22.3980377670\) |
| Analytic rank: | \(0\) |
| Dimension: | \(2\) |
| Coefficient field: | \(\Q(\sqrt{2}) \) |
|
comment: defining polynomial
gp: f.mod \\ as an extension of the character field
|
|
| Defining polynomial: |
\( x^{2} - 2 \)
|
| Coefficient ring: | \(\Z[a_1, a_2]\) |
| 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)
Coefficients of the \(q\)-expansion are expressed in terms of \(\beta = \sqrt{2}\). 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 |
|
−2.41421 | −1.00000 | 3.82843 | −1.00000 | 2.41421 | 1.58579 | −4.41421 | 1.00000 | 2.41421 | ||||||||||||||||||||||||
| 1.2 | 0.414214 | −1.00000 | −1.82843 | −1.00000 | −0.414214 | 4.41421 | −1.58579 | 1.00000 | −0.414214 | |||||||||||||||||||||||||
Atkin-Lehner signs
| \( p \) | Sign |
|---|---|
| \(3\) | \(1\) |
| \(5\) | \(1\) |
| \(11\) | \(1\) |
| \(17\) | \(-1\) |
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 | 2805.2.a.f | ✓ | 2 |
| 3.b | odd | 2 | 1 | 8415.2.a.v | 2 | ||
| By twisted newform orbit | |||||||
|---|---|---|---|---|---|---|---|
| Twist | Min | Dim | Char | Parity | Ord | Mult | Type |
| 2805.2.a.f | ✓ | 2 | 1.a | even | 1 | 1 | trivial |
| 8415.2.a.v | 2 | 3.b | odd | 2 | 1 | ||
Hecke kernels
This newform subspace can be constructed as the intersection of the kernels of the following linear operators acting on \(S_{2}^{\mathrm{new}}(\Gamma_0(2805))\):
|
\( T_{2}^{2} + 2T_{2} - 1 \)
|
|
\( T_{7}^{2} - 6T_{7} + 7 \)
|
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\( T_{19}^{2} - 2T_{19} - 7 \)
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Hecke characteristic polynomials
| $p$ | $F_p(T)$ |
|---|---|
| $2$ |
\( T^{2} + 2T - 1 \)
|
| $3$ |
\( (T + 1)^{2} \)
|
| $5$ |
\( (T + 1)^{2} \)
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| $7$ |
\( T^{2} - 6T + 7 \)
|
| $11$ |
\( (T + 1)^{2} \)
|
| $13$ |
\( (T - 5)^{2} \)
|
| $17$ |
\( (T - 1)^{2} \)
|
| $19$ |
\( T^{2} - 2T - 7 \)
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| $23$ |
\( T^{2} + 6T + 1 \)
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| $29$ |
\( T^{2} - 4T - 28 \)
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| $31$ |
\( T^{2} - 2T - 49 \)
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| $37$ |
\( T^{2} + 2T - 17 \)
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| $41$ |
\( T^{2} - 72 \)
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| $43$ |
\( T^{2} - 16T + 56 \)
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| $47$ |
\( (T + 4)^{2} \)
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| $53$ |
\( T^{2} + 8T + 8 \)
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| $59$ |
\( (T - 10)^{2} \)
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| $61$ |
\( T^{2} + 22T + 119 \)
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| $67$ |
\( T^{2} - 22T + 113 \)
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| $71$ |
\( T^{2} - 4T - 124 \)
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| $73$ |
\( T^{2} - 12T + 4 \)
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| $79$ |
\( T^{2} - 128 \)
|
| $83$ |
\( T^{2} + 6T - 89 \)
|
| $89$ |
\( (T - 14)^{2} \)
|
| $97$ |
\( T^{2} - 14T - 1 \)
|
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