Newspace parameters
comment: Compute space of new eigenforms
[N,k,chi] = [2240,4,Mod(1,2240)]
mf = mfinit([N,k,chi],0)
lf = mfeigenbasis(mf)
from sage.modular.dirichlet import DirichletCharacter
H = DirichletGroup(2240, base_ring=CyclotomicField(2))
chi = DirichletCharacter(H, H._module([0, 0, 0, 0]))
N = Newforms(chi, 4, names="a")
//Please install CHIMP (https://github.com/edgarcosta/CHIMP) if you want to run this code
chi := DirichletCharacter("2240.1");
S:= CuspForms(chi, 4);
N := Newforms(S);
| Level: | \( N \) | \(=\) | \( 2240 = 2^{6} \cdot 5 \cdot 7 \) |
| Weight: | \( k \) | \(=\) | \( 4 \) |
| Character orbit: | \([\chi]\) | \(=\) | 2240.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: | \(132.164278413\) |
| Analytic rank: | \(1\) |
| Dimension: | \(4\) |
| Coefficient field: | \(\mathbb{Q}[x]/(x^{4} - \cdots)\) |
|
comment: defining polynomial
gp: f.mod \\ as an extension of the character field
|
|
| Defining polynomial: |
\( x^{4} - x^{3} - 65x^{2} - 11x + 724 \)
|
| Coefficient ring: | \(\Z[a_1, \ldots, a_{13}]\) |
| Coefficient ring index: | \( 2^{3} \) |
| Twist minimal: | no (minimal twist has level 1120) |
| 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 \(1,\beta_1,\beta_2,\beta_3\) 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
\( x^{4} - x^{3} - 65x^{2} - 11x + 724 \)
:
| \(\beta_{1}\) | \(=\) |
\( \nu \)
|
| \(\beta_{2}\) | \(=\) |
\( \nu^{2} - 2\nu - 32 \)
|
| \(\beta_{3}\) | \(=\) |
\( ( \nu^{3} - 4\nu^{2} - 39\nu + 84 ) / 2 \)
|
| \(\nu\) | \(=\) |
\( \beta_1 \)
|
| \(\nu^{2}\) | \(=\) |
\( \beta_{2} + 2\beta _1 + 32 \)
|
| \(\nu^{3}\) | \(=\) |
\( 2\beta_{3} + 4\beta_{2} + 47\beta _1 + 44 \)
|
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 |
|
0 | −7.92333 | 0 | 5.00000 | 0 | −7.00000 | 0 | 35.7791 | 0 | ||||||||||||||||||||||||||||||
| 1.2 | 0 | −3.48924 | 0 | 5.00000 | 0 | −7.00000 | 0 | −14.8252 | 0 | |||||||||||||||||||||||||||||||
| 1.3 | 0 | 4.24838 | 0 | 5.00000 | 0 | −7.00000 | 0 | −8.95131 | 0 | |||||||||||||||||||||||||||||||
| 1.4 | 0 | 6.16420 | 0 | 5.00000 | 0 | −7.00000 | 0 | 10.9973 | 0 | |||||||||||||||||||||||||||||||
Atkin-Lehner signs
| \( p \) | Sign |
|---|---|
| \(2\) | \(1\) |
| \(5\) | \(-1\) |
| \(7\) | \(1\) |
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 | 2240.4.a.cf | 4 | |
| 4.b | odd | 2 | 1 | 2240.4.a.cg | 4 | ||
| 8.b | even | 2 | 1 | 1120.4.a.k | yes | 4 | |
| 8.d | odd | 2 | 1 | 1120.4.a.j | ✓ | 4 | |
| By twisted newform orbit | |||||||
|---|---|---|---|---|---|---|---|
| Twist | Min | Dim | Char | Parity | Ord | Mult | Type |
| 1120.4.a.j | ✓ | 4 | 8.d | odd | 2 | 1 | |
| 1120.4.a.k | yes | 4 | 8.b | even | 2 | 1 | |
| 2240.4.a.cf | 4 | 1.a | even | 1 | 1 | trivial | |
| 2240.4.a.cg | 4 | 4.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 \(S_{4}^{\mathrm{new}}(\Gamma_0(2240))\):
|
\( T_{3}^{4} + T_{3}^{3} - 65T_{3}^{2} + 11T_{3} + 724 \)
|
|
\( T_{11}^{4} + 31T_{11}^{3} - 293T_{11}^{2} - 4627T_{11} + 33520 \)
|
Hecke characteristic polynomials
| $p$ | $F_p(T)$ |
|---|---|
| $2$ |
\( T^{4} \)
|
| $3$ |
\( T^{4} + T^{3} + \cdots + 724 \)
|
| $5$ |
\( (T - 5)^{4} \)
|
| $7$ |
\( (T + 7)^{4} \)
|
| $11$ |
\( T^{4} + 31 T^{3} + \cdots + 33520 \)
|
| $13$ |
\( T^{4} - 13 T^{3} + \cdots + 2220550 \)
|
| $17$ |
\( T^{4} - 25 T^{3} + \cdots - 287350 \)
|
| $19$ |
\( T^{4} + 68 T^{3} + \cdots - 30637440 \)
|
| $23$ |
\( T^{4} - 36 T^{3} + \cdots + 100445184 \)
|
| $29$ |
\( T^{4} - 109 T^{3} + \cdots - 47381910 \)
|
| $31$ |
\( T^{4} + 66 T^{3} + \cdots + 8055360 \)
|
| $37$ |
\( T^{4} - 10 T^{3} + \cdots + 918676800 \)
|
| $41$ |
\( T^{4} + 72 T^{3} + \cdots - 671665200 \)
|
| $43$ |
\( T^{4} + \cdots + 5708371712 \)
|
| $47$ |
\( T^{4} + 255 T^{3} + \cdots - 890784288 \)
|
| $53$ |
\( T^{4} - 510 T^{3} + \cdots + 535824000 \)
|
| $59$ |
\( T^{4} + \cdots + 21420134400 \)
|
| $61$ |
\( T^{4} + \cdots - 23638540400 \)
|
| $67$ |
\( T^{4} + \cdots + 12425516032 \)
|
| $71$ |
\( T^{4} + \cdots - 5405350400 \)
|
| $73$ |
\( T^{4} + \cdots - 2160516560 \)
|
| $79$ |
\( T^{4} + \cdots - 36565188120 \)
|
| $83$ |
\( T^{4} + \cdots - 7818427392 \)
|
| $89$ |
\( T^{4} + \cdots - 21201471216 \)
|
| $97$ |
\( T^{4} + \cdots - 72239327910 \)
|
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