Newspace parameters
comment: Compute space of new eigenforms
[N,k,chi] = [100,18,Mod(49,100)]
mf = mfinit([N,k,chi],0)
lf = mfeigenbasis(mf)
from sage.modular.dirichlet import DirichletCharacter
H = DirichletGroup(100, base_ring=CyclotomicField(2))
chi = DirichletCharacter(H, H._module([0, 1]))
N = Newforms(chi, 18, names="a")
//Please install CHIMP (https://github.com/edgarcosta/CHIMP) if you want to run this code
chi := DirichletCharacter("100.49");
S:= CuspForms(chi, 18);
N := Newforms(S);
| Level: | \( N \) | \(=\) | \( 100 = 2^{2} \cdot 5^{2} \) |
| Weight: | \( k \) | \(=\) | \( 18 \) |
| Character orbit: | \([\chi]\) | \(=\) | 100.c (of order \(2\), degree \(1\), not minimal) |
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: | no |
| Analytic conductor: | \(183.222087345\) |
| Analytic rank: | \(0\) |
| Dimension: | \(4\) |
| Coefficient field: | \(\Q(i, \sqrt{9361})\) |
|
comment: defining polynomial
gp: f.mod \\ as an extension of the character field
|
|
| Defining polynomial: |
\( x^{4} + 4681x^{2} + 5475600 \)
|
| Coefficient ring: | \(\Z[a_1, \ldots, a_{13}]\) |
| Coefficient ring index: | \( 2^{15}\cdot 3^{2}\cdot 5^{2} \) |
| Twist minimal: | no (minimal twist has level 4) |
| Sato-Tate group: | $\mathrm{SU}(2)[C_{2}]$ |
$q$-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
\( x^{4} + 4681x^{2} + 5475600 \)
:
| \(\beta_{1}\) | \(=\) |
\( ( -\nu^{3} - 2341\nu ) / 234 \)
|
| \(\beta_{2}\) | \(=\) |
\( ( 16\nu^{3} + 112336\nu ) / 195 \)
|
| \(\beta_{3}\) | \(=\) |
\( 1920\nu^{2} + 4493760 \)
|
| \(\nu\) | \(=\) |
\( ( 5\beta_{2} + 96\beta_1 ) / 1920 \)
|
| \(\nu^{2}\) | \(=\) |
\( ( \beta_{3} - 4493760 ) / 1920 \)
|
| \(\nu^{3}\) | \(=\) |
\( ( -11705\beta_{2} - 674016\beta_1 ) / 1920 \)
|
Character values
We give the values of \(\chi\) on generators for \(\left(\mathbb{Z}/100\mathbb{Z}\right)^\times\).
| \(n\) | \(51\) | \(77\) |
| \(\chi(n)\) | \(1\) | \(-1\) |
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 | \(\iota_m(\nu)\) | \( a_{2} \) | \( a_{3} \) | \( a_{4} \) | \( a_{5} \) | \( a_{6} \) | \( a_{7} \) | \( a_{8} \) | \( a_{9} \) | \( a_{10} \) | ||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 49.1 |
|
0 | − | 21516.4i | 0 | 0 | 0 | − | 1.64068e6i | 0 | −3.33817e8 | 0 | ||||||||||||||||||||||||||||
| 49.2 | 0 | − | 15636.4i | 0 | 0 | 0 | 2.37095e7i | 0 | −1.15358e8 | 0 | ||||||||||||||||||||||||||||||
| 49.3 | 0 | 15636.4i | 0 | 0 | 0 | − | 2.37095e7i | 0 | −1.15358e8 | 0 | ||||||||||||||||||||||||||||||
| 49.4 | 0 | 21516.4i | 0 | 0 | 0 | 1.64068e6i | 0 | −3.33817e8 | 0 | |||||||||||||||||||||||||||||||
Inner twists
| Char | Parity | Ord | Mult | Type |
|---|---|---|---|---|
| 1.a | even | 1 | 1 | trivial |
| 5.b | even | 2 | 1 | inner |
Twists
| By twisting character orbit | |||||||
|---|---|---|---|---|---|---|---|
| Char | Parity | Ord | Mult | Type | Twist | Min | Dim |
| 1.a | even | 1 | 1 | trivial | 100.18.c.a | 4 | |
| 5.b | even | 2 | 1 | inner | 100.18.c.a | 4 | |
| 5.c | odd | 4 | 1 | 4.18.a.a | ✓ | 2 | |
| 5.c | odd | 4 | 1 | 100.18.a.b | 2 | ||
| 15.e | even | 4 | 1 | 36.18.a.d | 2 | ||
| 20.e | even | 4 | 1 | 16.18.a.e | 2 | ||
| 40.i | odd | 4 | 1 | 64.18.a.l | 2 | ||
| 40.k | even | 4 | 1 | 64.18.a.g | 2 | ||
| By twisted newform orbit | |||||||
|---|---|---|---|---|---|---|---|
| Twist | Min | Dim | Char | Parity | Ord | Mult | Type |
| 4.18.a.a | ✓ | 2 | 5.c | odd | 4 | 1 | |
| 16.18.a.e | 2 | 20.e | even | 4 | 1 | ||
| 36.18.a.d | 2 | 15.e | even | 4 | 1 | ||
| 64.18.a.g | 2 | 40.k | even | 4 | 1 | ||
| 64.18.a.l | 2 | 40.i | odd | 4 | 1 | ||
| 100.18.a.b | 2 | 5.c | odd | 4 | 1 | ||
| 100.18.c.a | 4 | 1.a | even | 1 | 1 | trivial | |
| 100.18.c.a | 4 | 5.b | even | 2 | 1 | inner | |
Hecke kernels
This newform subspace can be constructed as the kernel of the linear operator
\( T_{3}^{4} + 707455008T_{3}^{2} + 113192078155612416 \)
acting on \(S_{18}^{\mathrm{new}}(100, [\chi])\).
Hecke characteristic polynomials
| $p$ | $F_p(T)$ |
|---|---|
| $2$ |
\( T^{4} \)
|
| $3$ |
\( T^{4} + \cdots + 11\!\cdots\!16 \)
|
| $5$ |
\( T^{4} \)
|
| $7$ |
\( T^{4} + \cdots + 15\!\cdots\!36 \)
|
| $11$ |
\( (T^{2} + \cdots - 10\!\cdots\!00)^{2} \)
|
| $13$ |
\( T^{4} + \cdots + 75\!\cdots\!36 \)
|
| $17$ |
\( T^{4} + \cdots + 31\!\cdots\!16 \)
|
| $19$ |
\( (T^{2} + \cdots - 26\!\cdots\!44)^{2} \)
|
| $23$ |
\( T^{4} + \cdots + 42\!\cdots\!96 \)
|
| $29$ |
\( (T^{2} + \cdots - 50\!\cdots\!24)^{2} \)
|
| $31$ |
\( (T^{2} + \cdots - 57\!\cdots\!04)^{2} \)
|
| $37$ |
\( T^{4} + \cdots + 63\!\cdots\!76 \)
|
| $41$ |
\( (T^{2} + \cdots - 12\!\cdots\!44)^{2} \)
|
| $43$ |
\( T^{4} + \cdots + 49\!\cdots\!00 \)
|
| $47$ |
\( T^{4} + \cdots + 18\!\cdots\!36 \)
|
| $53$ |
\( T^{4} + \cdots + 73\!\cdots\!76 \)
|
| $59$ |
\( (T^{2} + \cdots + 19\!\cdots\!44)^{2} \)
|
| $61$ |
\( (T^{2} + \cdots - 45\!\cdots\!76)^{2} \)
|
| $67$ |
\( T^{4} + \cdots + 15\!\cdots\!56 \)
|
| $71$ |
\( (T^{2} + \cdots - 37\!\cdots\!56)^{2} \)
|
| $73$ |
\( T^{4} + \cdots + 16\!\cdots\!76 \)
|
| $79$ |
\( (T^{2} + \cdots + 11\!\cdots\!04)^{2} \)
|
| $83$ |
\( T^{4} + \cdots + 21\!\cdots\!56 \)
|
| $89$ |
\( (T^{2} + \cdots + 65\!\cdots\!36)^{2} \)
|
| $97$ |
\( T^{4} + \cdots + 79\!\cdots\!96 \)
|
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