Newspace parameters
comment: Compute space of new eigenforms
[N,k,chi] = [805,2,Mod(1,805)]
mf = mfinit([N,k,chi],0)
lf = mfeigenbasis(mf)
from sage.modular.dirichlet import DirichletCharacter
H = DirichletGroup(805, base_ring=CyclotomicField(2))
chi = DirichletCharacter(H, H._module([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("805.1");
S:= CuspForms(chi, 2);
N := Newforms(S);
| Level: | \( N \) | \(=\) | \( 805 = 5 \cdot 7 \cdot 23 \) |
| Weight: | \( k \) | \(=\) | \( 2 \) |
| Character orbit: | \([\chi]\) | \(=\) | 805.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: | \(6.42795736271\) |
| Analytic rank: | \(1\) |
| Dimension: | \(5\) |
| Coefficient field: | 5.5.255877.1 |
|
comment: defining polynomial
gp: f.mod \\ as an extension of the character field
|
|
| Defining polynomial: |
\( x^{5} - x^{4} - 6x^{3} + 6x^{2} + 6x - 5 \)
|
| 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 a basis \(1,\beta_1,\beta_2,\beta_3,\beta_4\) for the coefficient ring described below. We also show the integral \(q\)-expansion of the trace form.
Basis of coefficient ring in terms of a root \(\nu\) of
\( x^{5} - x^{4} - 6x^{3} + 6x^{2} + 6x - 5 \)
:
| \(\beta_{1}\) | \(=\) |
\( \nu \)
|
| \(\beta_{2}\) | \(=\) |
\( \nu^{2} - 3 \)
|
| \(\beta_{3}\) | \(=\) |
\( \nu^{3} - 4\nu + 1 \)
|
| \(\beta_{4}\) | \(=\) |
\( \nu^{4} - 5\nu^{2} + 3 \)
|
| \(\nu\) | \(=\) |
\( \beta_1 \)
|
| \(\nu^{2}\) | \(=\) |
\( \beta_{2} + 3 \)
|
| \(\nu^{3}\) | \(=\) |
\( \beta_{3} + 4\beta _1 - 1 \)
|
| \(\nu^{4}\) | \(=\) |
\( \beta_{4} + 5\beta_{2} + 12 \)
|
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 |
|
−2.10917 | −1.54702 | 2.44859 | −1.00000 | 3.26292 | 1.00000 | −0.946160 | −0.606735 | 2.10917 | |||||||||||||||||||||||||||||||||
| 1.2 | −1.45275 | 2.09827 | 0.110473 | −1.00000 | −3.04825 | 1.00000 | 2.74500 | 1.40273 | 1.45275 | ||||||||||||||||||||||||||||||||||
| 1.3 | −0.698160 | −1.80045 | −1.51257 | −1.00000 | 1.25700 | 1.00000 | 2.45234 | 0.241606 | 0.698160 | ||||||||||||||||||||||||||||||||||
| 1.4 | 1.06459 | 0.382286 | −0.866643 | −1.00000 | 0.406979 | 1.00000 | −3.05181 | −2.85386 | −1.06459 | ||||||||||||||||||||||||||||||||||
| 1.5 | 2.19548 | −3.13309 | 2.82015 | −1.00000 | −6.87865 | 1.00000 | 1.80062 | 6.81626 | −2.19548 | ||||||||||||||||||||||||||||||||||
Atkin-Lehner signs
| \( p \) | Sign |
|---|---|
| \(5\) | \(1\) |
| \(7\) | \(-1\) |
| \(23\) | \(-1\) |
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 | 805.2.a.l | ✓ | 5 |
| 3.b | odd | 2 | 1 | 7245.2.a.bh | 5 | ||
| 5.b | even | 2 | 1 | 4025.2.a.q | 5 | ||
| 7.b | odd | 2 | 1 | 5635.2.a.y | 5 | ||
| By twisted newform orbit | |||||||
|---|---|---|---|---|---|---|---|
| Twist | Min | Dim | Char | Parity | Ord | Mult | Type |
| 805.2.a.l | ✓ | 5 | 1.a | even | 1 | 1 | trivial |
| 4025.2.a.q | 5 | 5.b | even | 2 | 1 | ||
| 5635.2.a.y | 5 | 7.b | odd | 2 | 1 | ||
| 7245.2.a.bh | 5 | 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 \(S_{2}^{\mathrm{new}}(\Gamma_0(805))\):
|
\( T_{2}^{5} + T_{2}^{4} - 6T_{2}^{3} - 6T_{2}^{2} + 6T_{2} + 5 \)
|
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\( T_{3}^{5} + 4T_{3}^{4} - 2T_{3}^{3} - 19T_{3}^{2} - 11T_{3} + 7 \)
|
|
\( T_{11}^{5} + 7T_{11}^{4} - 4T_{11}^{3} - 107T_{11}^{2} - 156T_{11} + 68 \)
|
Hecke characteristic polynomials
| $p$ | $F_p(T)$ |
|---|---|
| $2$ |
\( T^{5} + T^{4} - 6 T^{3} + \cdots + 5 \)
|
| $3$ |
\( T^{5} + 4 T^{4} + \cdots + 7 \)
|
| $5$ |
\( (T + 1)^{5} \)
|
| $7$ |
\( (T - 1)^{5} \)
|
| $11$ |
\( T^{5} + 7 T^{4} + \cdots + 68 \)
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| $13$ |
\( T^{5} + 5 T^{4} + \cdots - 5 \)
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| $17$ |
\( T^{5} + 7 T^{4} + \cdots + 716 \)
|
| $19$ |
\( T^{5} + 10 T^{4} + \cdots + 124 \)
|
| $23$ |
\( (T - 1)^{5} \)
|
| $29$ |
\( T^{5} + 14 T^{4} + \cdots - 392 \)
|
| $31$ |
\( T^{5} + 10 T^{4} + \cdots - 17 \)
|
| $37$ |
\( T^{5} + 3 T^{4} + \cdots + 428 \)
|
| $41$ |
\( T^{5} + 15 T^{4} + \cdots + 451 \)
|
| $43$ |
\( T^{5} - 8 T^{4} + \cdots + 140 \)
|
| $47$ |
\( T^{5} + 10 T^{4} + \cdots + 329 \)
|
| $53$ |
\( T^{5} + 9 T^{4} + \cdots - 6388 \)
|
| $59$ |
\( T^{5} + 19 T^{4} + \cdots - 400 \)
|
| $61$ |
\( T^{5} + 21 T^{4} + \cdots - 1228 \)
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| $67$ |
\( T^{5} - 5 T^{4} + \cdots + 6508 \)
|
| $71$ |
\( T^{5} + 16 T^{4} + \cdots + 1195 \)
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| $73$ |
\( T^{5} - T^{4} + \cdots + 22637 \)
|
| $79$ |
\( T^{5} - 20 T^{4} + \cdots + 4 \)
|
| $83$ |
\( T^{5} + 31 T^{4} + \cdots - 110564 \)
|
| $89$ |
\( T^{5} + 21 T^{4} + \cdots - 30644 \)
|
| $97$ |
\( T^{5} - 19 T^{4} + \cdots - 98812 \)
|
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