Newspace parameters
comment: Compute space of new eigenforms
[N,k,chi] = [16,28,Mod(1,16)]
mf = mfinit([N,k,chi],0)
lf = mfeigenbasis(mf)
from sage.modular.dirichlet import DirichletCharacter
H = DirichletGroup(16, base_ring=CyclotomicField(2))
chi = DirichletCharacter(H, H._module([0, 0]))
N = Newforms(chi, 28, names="a")
//Please install CHIMP (https://github.com/edgarcosta/CHIMP) if you want to run this code
chi := DirichletCharacter("16.1");
S:= CuspForms(chi, 28);
N := Newforms(S);
| Level: | \( N \) | \(=\) | \( 16 = 2^{4} \) |
| Weight: | \( k \) | \(=\) | \( 28 \) |
| Character orbit: | \([\chi]\) | \(=\) | 16.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: | \(73.8968919741\) |
| Analytic rank: | \(0\) |
| 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: |
\( x^{4} - 8494973x^{2} - 3687596342x + 10439241475305 \)
|
| Coefficient ring: | \(\Z[a_1, \ldots, a_{7}]\) |
| Coefficient ring index: | \( 2^{42}\cdot 3^{5}\cdot 5 \) |
| Twist minimal: | no (minimal twist has level 8) |
| 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
\( x^{4} - 8494973x^{2} - 3687596342x + 10439241475305 \)
:
| \(\beta_{1}\) | \(=\) |
\( ( -6400\nu^{3} + 12233856\nu^{2} + 30527542016\nu - 34262675761344 ) / 2193191 \)
|
| \(\beta_{2}\) | \(=\) |
\( ( 630016\nu^{3} + 951693696\nu^{2} - 5622508535552\nu - 5784739648646208 ) / 2193191 \)
|
| \(\beta_{3}\) | \(=\) |
\( ( 12169728\nu^{3} + 101784758016\nu^{2} + 162699231189504\nu - 465987168920678016 ) / 2193191 \)
|
| \(\nu\) | \(=\) |
\( ( \beta_{3} - 58\beta_{2} - 3808\beta_1 ) / 169869312 \)
|
| \(\nu^{2}\) | \(=\) |
\( ( 607\beta_{3} + 51194\beta_{2} + 6193760\beta _1 + 360758804742144 ) / 84934656 \)
|
| \(\nu^{3}\) | \(=\) |
\( ( 3545269\beta_{3} - 40468546\beta_{2} - 26348249248\beta _1 + 234903545080971264 ) / 84934656 \)
|
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 | −5.03426e6 | 0 | 2.36507e9 | 0 | 2.46921e11 | 0 | 1.77182e13 | 0 | ||||||||||||||||||||||||||||||
| 1.2 | 0 | −75899.9 | 0 | 1.61881e9 | 0 | −4.99032e11 | 0 | −7.61984e12 | 0 | |||||||||||||||||||||||||||||||
| 1.3 | 0 | 248705. | 0 | −3.54329e9 | 0 | 2.27408e11 | 0 | −7.56374e12 | 0 | |||||||||||||||||||||||||||||||
| 1.4 | 0 | 4.98397e6 | 0 | 3.10348e9 | 0 | 2.36469e11 | 0 | 1.72143e13 | 0 | |||||||||||||||||||||||||||||||
Atkin-Lehner signs
| \( p \) | Sign |
|---|---|
| \(2\) | \( +1 \) |
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 | 16.28.a.f | 4 | |
| 4.b | odd | 2 | 1 | 8.28.a.b | ✓ | 4 | |
| By twisted newform orbit | |||||||
|---|---|---|---|---|---|---|---|
| Twist | Min | Dim | Char | Parity | Ord | Mult | Type |
| 8.28.a.b | ✓ | 4 | 4.b | odd | 2 | 1 | |
| 16.28.a.f | 4 | 1.a | even | 1 | 1 | trivial | |
Hecke kernels
This newform subspace can be constructed as the kernel of the linear operator
\( T_{3}^{4} - 122512T_{3}^{3} - 25118155626912T_{3}^{2} + 4334841990686082816T_{3} + 473627677716066582339840 \)
acting on \(S_{28}^{\mathrm{new}}(\Gamma_0(16))\).
Hecke characteristic polynomials
| $p$ | $F_p(T)$ |
|---|---|
| $2$ |
\( T^{4} \)
|
| $3$ |
\( T^{4} + \cdots + 47\!\cdots\!40 \)
|
| $5$ |
\( T^{4} + \cdots - 42\!\cdots\!00 \)
|
| $7$ |
\( T^{4} + \cdots - 66\!\cdots\!32 \)
|
| $11$ |
\( T^{4} + \cdots - 13\!\cdots\!56 \)
|
| $13$ |
\( T^{4} + \cdots + 17\!\cdots\!12 \)
|
| $17$ |
\( T^{4} + \cdots - 37\!\cdots\!00 \)
|
| $19$ |
\( T^{4} + \cdots - 74\!\cdots\!16 \)
|
| $23$ |
\( T^{4} + \cdots - 43\!\cdots\!12 \)
|
| $29$ |
\( T^{4} + \cdots - 26\!\cdots\!76 \)
|
| $31$ |
\( T^{4} + \cdots - 10\!\cdots\!00 \)
|
| $37$ |
\( T^{4} + \cdots - 12\!\cdots\!96 \)
|
| $41$ |
\( T^{4} + \cdots - 32\!\cdots\!88 \)
|
| $43$ |
\( T^{4} + \cdots - 67\!\cdots\!12 \)
|
| $47$ |
\( T^{4} + \cdots - 27\!\cdots\!64 \)
|
| $53$ |
\( T^{4} + \cdots - 74\!\cdots\!24 \)
|
| $59$ |
\( T^{4} + \cdots - 99\!\cdots\!08 \)
|
| $61$ |
\( T^{4} + \cdots + 40\!\cdots\!00 \)
|
| $67$ |
\( T^{4} + \cdots + 24\!\cdots\!92 \)
|
| $71$ |
\( T^{4} + \cdots - 26\!\cdots\!80 \)
|
| $73$ |
\( T^{4} + \cdots + 28\!\cdots\!48 \)
|
| $79$ |
\( T^{4} + \cdots + 40\!\cdots\!40 \)
|
| $83$ |
\( T^{4} + \cdots - 19\!\cdots\!68 \)
|
| $89$ |
\( T^{4} + \cdots - 73\!\cdots\!56 \)
|
| $97$ |
\( T^{4} + \cdots - 17\!\cdots\!64 \)
|
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