Newspace parameters
comment: Compute space of new eigenforms
[N,k,chi] = [75,10,Mod(1,75)]
mf = mfinit([N,k,chi],0)
lf = mfeigenbasis(mf)
from sage.modular.dirichlet import DirichletCharacter
H = DirichletGroup(75, base_ring=CyclotomicField(2))
chi = DirichletCharacter(H, H._module([0, 0]))
N = Newforms(chi, 10, names="a")
//Please install CHIMP (https://github.com/edgarcosta/CHIMP) if you want to run this code
chi := DirichletCharacter("75.1");
S:= CuspForms(chi, 10);
N := Newforms(S);
| Level: | \( N \) | \(=\) | \( 75 = 3 \cdot 5^{2} \) |
| Weight: | \( k \) | \(=\) | \( 10 \) |
| Character orbit: | \([\chi]\) | \(=\) | 75.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: | \(38.6276877123\) |
| 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: |
\( x^{4} - x^{3} - 469x^{2} + 4449x - 5580 \)
|
| Coefficient ring: | \(\Z[a_1, \ldots, a_{7}]\) |
| Coefficient ring index: | \( 2^{2}\cdot 3^{2}\cdot 5^{2} \) |
| Twist minimal: | no (minimal twist has level 15) |
| 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
\( x^{4} - x^{3} - 469x^{2} + 4449x - 5580 \)
:
| \(\beta_{1}\) | \(=\) |
\( ( \nu^{3} + 8\nu^{2} - 349\nu + 1188 ) / 24 \)
|
| \(\beta_{2}\) | \(=\) |
\( ( -11\nu^{3} - 88\nu^{2} + 4559\nu - 13308 ) / 24 \)
|
| \(\beta_{3}\) | \(=\) |
\( ( 59\nu^{3} + 832\nu^{2} - 17351\nu - 14868 ) / 24 \)
|
| \(\nu\) | \(=\) |
\( ( \beta_{2} + 11\beta _1 + 10 ) / 30 \)
|
| \(\nu^{2}\) | \(=\) |
\( ( 2\beta_{3} - 9\beta_{2} - 217\beta _1 + 6990 ) / 30 \)
|
| \(\nu^{3}\) | \(=\) |
\( ( -16\beta_{3} + 421\beta_{2} + 6295\beta _1 - 88070 ) / 30 \)
|
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 |
|
−33.3847 | 81.0000 | 602.537 | 0 | −2704.16 | 176.118 | −3022.54 | 6561.00 | 0 | ||||||||||||||||||||||||||||||
| 1.2 | −14.3372 | 81.0000 | −306.446 | 0 | −1161.31 | −2878.61 | 11734.2 | 6561.00 | 0 | |||||||||||||||||||||||||||||||
| 1.3 | 20.9703 | 81.0000 | −72.2477 | 0 | 1698.59 | 3575.78 | −12251.8 | 6561.00 | 0 | |||||||||||||||||||||||||||||||
| 1.4 | 29.7516 | 81.0000 | 373.156 | 0 | 2409.88 | −10707.3 | −4130.82 | 6561.00 | 0 | |||||||||||||||||||||||||||||||
Atkin-Lehner signs
| \( p \) | Sign |
|---|---|
| \(3\) | \(-1\) |
| \(5\) | \(-1\) |
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 | 75.10.a.l | 4 | |
| 3.b | odd | 2 | 1 | 225.10.a.q | 4 | ||
| 5.b | even | 2 | 1 | 75.10.a.i | 4 | ||
| 5.c | odd | 4 | 2 | 15.10.b.a | ✓ | 8 | |
| 15.d | odd | 2 | 1 | 225.10.a.u | 4 | ||
| 15.e | even | 4 | 2 | 45.10.b.c | 8 | ||
| 20.e | even | 4 | 2 | 240.10.f.c | 8 | ||
| By twisted newform orbit | |||||||
|---|---|---|---|---|---|---|---|
| Twist | Min | Dim | Char | Parity | Ord | Mult | Type |
| 15.10.b.a | ✓ | 8 | 5.c | odd | 4 | 2 | |
| 45.10.b.c | 8 | 15.e | even | 4 | 2 | ||
| 75.10.a.i | 4 | 5.b | even | 2 | 1 | ||
| 75.10.a.l | 4 | 1.a | even | 1 | 1 | trivial | |
| 225.10.a.q | 4 | 3.b | odd | 2 | 1 | ||
| 225.10.a.u | 4 | 15.d | odd | 2 | 1 | ||
| 240.10.f.c | 8 | 20.e | even | 4 | 2 | ||
Hecke kernels
This newform subspace can be constructed as the kernel of the linear operator
\( T_{2}^{4} - 3T_{2}^{3} - 1318T_{2}^{2} + 5496T_{2} + 298624 \)
acting on \(S_{10}^{\mathrm{new}}(\Gamma_0(75))\).
Hecke characteristic polynomials
| $p$ | $F_p(T)$ |
|---|---|
| $2$ |
\( T^{4} - 3 T^{3} + \cdots + 298624 \)
|
| $3$ |
\( (T - 81)^{4} \)
|
| $5$ |
\( T^{4} \)
|
| $7$ |
\( T^{4} + \cdots + 19410591362400 \)
|
| $11$ |
\( T^{4} + \cdots + 69\!\cdots\!44 \)
|
| $13$ |
\( T^{4} + \cdots - 21\!\cdots\!56 \)
|
| $17$ |
\( T^{4} + \cdots + 14\!\cdots\!76 \)
|
| $19$ |
\( T^{4} + \cdots - 31\!\cdots\!00 \)
|
| $23$ |
\( T^{4} + \cdots + 48\!\cdots\!00 \)
|
| $29$ |
\( T^{4} + \cdots + 29\!\cdots\!00 \)
|
| $31$ |
\( T^{4} + \cdots - 79\!\cdots\!00 \)
|
| $37$ |
\( T^{4} + \cdots - 84\!\cdots\!00 \)
|
| $41$ |
\( T^{4} + \cdots - 62\!\cdots\!00 \)
|
| $43$ |
\( T^{4} + \cdots - 22\!\cdots\!24 \)
|
| $47$ |
\( T^{4} + \cdots - 25\!\cdots\!24 \)
|
| $53$ |
\( T^{4} + \cdots - 17\!\cdots\!00 \)
|
| $59$ |
\( T^{4} + \cdots - 71\!\cdots\!00 \)
|
| $61$ |
\( T^{4} + \cdots - 30\!\cdots\!64 \)
|
| $67$ |
\( T^{4} + \cdots + 29\!\cdots\!36 \)
|
| $71$ |
\( T^{4} + \cdots - 70\!\cdots\!04 \)
|
| $73$ |
\( T^{4} + \cdots - 69\!\cdots\!00 \)
|
| $79$ |
\( T^{4} + \cdots - 29\!\cdots\!00 \)
|
| $83$ |
\( T^{4} + \cdots - 14\!\cdots\!16 \)
|
| $89$ |
\( T^{4} + \cdots - 14\!\cdots\!00 \)
|
| $97$ |
\( T^{4} + \cdots + 20\!\cdots\!36 \)
|
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