Newspace parameters
comment: Compute space of new eigenforms
[N,k,chi] = [1728,4,Mod(1,1728)]
mf = mfinit([N,k,chi],0)
lf = mfeigenbasis(mf)
from sage.modular.dirichlet import DirichletCharacter
H = DirichletGroup(1728, base_ring=CyclotomicField(2))
chi = DirichletCharacter(H, H._module([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("1728.1");
S:= CuspForms(chi, 4);
N := Newforms(S);
| Level: | \( N \) | \(=\) | \( 1728 = 2^{6} \cdot 3^{3} \) |
| Weight: | \( k \) | \(=\) | \( 4 \) |
| Character orbit: | \([\chi]\) | \(=\) | 1728.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: | \(101.955300490\) |
| Analytic rank: | \(0\) |
| Dimension: | \(3\) |
| Coefficient field: | 3.3.148.1 |
|
comment: defining polynomial
gp: f.mod \\ as an extension of the character field
|
|
| Defining polynomial: |
\( x^{3} - x^{2} - 3x + 1 \)
|
| Coefficient ring: | \(\Z[a_1, \ldots, a_{7}]\) |
| Coefficient ring index: | \( 2^{3}\cdot 3^{2} \) |
| Twist minimal: | no (minimal twist has level 864) |
| 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 \(1,\beta_1,\beta_2\) 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
\( x^{3} - x^{2} - 3x + 1 \)
:
| \(\beta_{1}\) | \(=\) |
\( -6\nu^{2} + 12\nu + 10 \)
|
| \(\beta_{2}\) | \(=\) |
\( 6\nu^{2} - 14 \)
|
| \(\nu\) | \(=\) |
\( ( \beta_{2} + \beta _1 + 4 ) / 12 \)
|
| \(\nu^{2}\) | \(=\) |
\( ( \beta_{2} + 14 ) / 6 \)
|
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 | 0 | 0 | −15.4193 | 0 | 29.5718 | 0 | 0 | 0 | |||||||||||||||||||||||||||
| 1.2 | 0 | 0 | 0 | −2.83638 | 0 | −17.1016 | 0 | 0 | 0 | ||||||||||||||||||||||||||||
| 1.3 | 0 | 0 | 0 | 12.2557 | 0 | −3.47027 | 0 | 0 | 0 | ||||||||||||||||||||||||||||
Atkin-Lehner signs
| \( p \) | Sign |
|---|---|
| \(2\) | \(-1\) |
| \(3\) | \(-1\) |
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 | 1728.4.a.bx | 3 | |
| 3.b | odd | 2 | 1 | 1728.4.a.cd | 3 | ||
| 4.b | odd | 2 | 1 | 1728.4.a.bw | 3 | ||
| 8.b | even | 2 | 1 | 864.4.a.r | yes | 3 | |
| 8.d | odd | 2 | 1 | 864.4.a.q | yes | 3 | |
| 12.b | even | 2 | 1 | 1728.4.a.cc | 3 | ||
| 24.f | even | 2 | 1 | 864.4.a.k | ✓ | 3 | |
| 24.h | odd | 2 | 1 | 864.4.a.l | yes | 3 | |
| By twisted newform orbit | |||||||
|---|---|---|---|---|---|---|---|
| Twist | Min | Dim | Char | Parity | Ord | Mult | Type |
| 864.4.a.k | ✓ | 3 | 24.f | even | 2 | 1 | |
| 864.4.a.l | yes | 3 | 24.h | odd | 2 | 1 | |
| 864.4.a.q | yes | 3 | 8.d | odd | 2 | 1 | |
| 864.4.a.r | yes | 3 | 8.b | even | 2 | 1 | |
| 1728.4.a.bw | 3 | 4.b | odd | 2 | 1 | ||
| 1728.4.a.bx | 3 | 1.a | even | 1 | 1 | trivial | |
| 1728.4.a.cc | 3 | 12.b | even | 2 | 1 | ||
| 1728.4.a.cd | 3 | 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 \(S_{4}^{\mathrm{new}}(\Gamma_0(1728))\):
|
\( T_{5}^{3} + 6T_{5}^{2} - 180T_{5} - 536 \)
|
|
\( T_{7}^{3} - 9T_{7}^{2} - 549T_{7} - 1755 \)
|
|
\( T_{11}^{3} + 18T_{11}^{2} - 1332T_{11} + 7992 \)
|
Hecke characteristic polynomials
| $p$ | $F_p(T)$ |
|---|---|
| $2$ |
\( T^{3} \)
|
| $3$ |
\( T^{3} \)
|
| $5$ |
\( T^{3} + 6 T^{2} + \cdots - 536 \)
|
| $7$ |
\( T^{3} - 9 T^{2} + \cdots - 1755 \)
|
| $11$ |
\( T^{3} + 18 T^{2} + \cdots + 7992 \)
|
| $13$ |
\( T^{3} + 3 T^{2} + \cdots + 59265 \)
|
| $17$ |
\( T^{3} - 18 T^{2} + \cdots + 449224 \)
|
| $19$ |
\( T^{3} + 27 T^{2} + \cdots - 863271 \)
|
| $23$ |
\( T^{3} - 90 T^{2} + \cdots + 119016 \)
|
| $29$ |
\( T^{3} + 72 T^{2} + \cdots - 70144 \)
|
| $31$ |
\( T^{3} - 144 T^{2} + \cdots + 1492992 \)
|
| $37$ |
\( T^{3} - 159 T^{2} + \cdots + 10625203 \)
|
| $41$ |
\( T^{3} + 168 T^{2} + \cdots - 6238720 \)
|
| $43$ |
\( T^{3} - 180 T^{2} + \cdots - 1086912 \)
|
| $47$ |
\( T^{3} - 522 T^{2} + \cdots + 117365544 \)
|
| $53$ |
\( T^{3} - 84 T^{2} + \cdots - 12028096 \)
|
| $59$ |
\( T^{3} + 1458 T^{2} + \cdots - 97306056 \)
|
| $61$ |
\( T^{3} + 33 T^{2} + \cdots + 42707123 \)
|
| $67$ |
\( T^{3} - 837 T^{2} + \cdots - 3857031 \)
|
| $71$ |
\( T^{3} - 1908 T^{2} + \cdots - 154692288 \)
|
| $73$ |
\( T^{3} + 165 T^{2} + \cdots + 184786407 \)
|
| $79$ |
\( T^{3} - 531 T^{2} + \cdots + 401433327 \)
|
| $83$ |
\( T^{3} + 2268 T^{2} + \cdots + 346227264 \)
|
| $89$ |
\( T^{3} - 618 T^{2} + \cdots + 401389160 \)
|
| $97$ |
\( T^{3} + 117 T^{2} + \cdots + 1877175 \)
|
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