Newspace parameters
comment: Compute space of new eigenforms
[N,k,chi] = [400,3,Mod(193,400)]
mf = mfinit([N,k,chi],0)
lf = mfeigenbasis(mf)
from sage.modular.dirichlet import DirichletCharacter
H = DirichletGroup(400, base_ring=CyclotomicField(4))
chi = DirichletCharacter(H, H._module([0, 0, 3]))
N = Newforms(chi, 3, names="a")
//Please install CHIMP (https://github.com/edgarcosta/CHIMP) if you want to run this code
chi := DirichletCharacter("400.193");
S:= CuspForms(chi, 3);
N := Newforms(S);
| Level: | \( N \) | \(=\) | \( 400 = 2^{4} \cdot 5^{2} \) |
| Weight: | \( k \) | \(=\) | \( 3 \) |
| Character orbit: | \([\chi]\) | \(=\) | 400.p (of order \(4\), degree \(2\), 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: | \(10.8992105744\) |
| Analytic rank: | \(0\) |
| Dimension: | \(4\) |
| Relative dimension: | \(2\) over \(\Q(i)\) |
| Coefficient field: | \(\Q(i, \sqrt{6})\) |
|
comment: defining polynomial
gp: f.mod \\ as an extension of the character field
|
|
| Defining polynomial: |
\( x^{4} + 9 \)
|
| Coefficient ring: | \(\Z[a_1, \ldots, a_{19}]\) |
| Coefficient ring index: | \( 1 \) |
| Twist minimal: | no (minimal twist has level 100) |
| Sato-Tate group: | $\mathrm{SU}(2)[C_{4}]$ |
$q$-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
\( x^{4} + 9 \)
:
| \(\beta_{1}\) | \(=\) |
\( \nu \)
|
| \(\beta_{2}\) | \(=\) |
\( ( \nu^{2} ) / 3 \)
|
| \(\beta_{3}\) | \(=\) |
\( ( \nu^{3} ) / 3 \)
|
| \(\nu\) | \(=\) |
\( \beta_1 \)
|
| \(\nu^{2}\) | \(=\) |
\( 3\beta_{2} \)
|
| \(\nu^{3}\) | \(=\) |
\( 3\beta_{3} \)
|
Character values
We give the values of \(\chi\) on generators for \(\left(\mathbb{Z}/400\mathbb{Z}\right)^\times\).
| \(n\) | \(101\) | \(177\) | \(351\) |
| \(\chi(n)\) | \(1\) | \(-\beta_{2}\) | \(1\) |
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 | \(\iota_m(\nu)\) | \( a_{2} \) | \( a_{3} \) | \( a_{4} \) | \( a_{5} \) | \( a_{6} \) | \( a_{7} \) | \( a_{8} \) | \( a_{9} \) | \( a_{10} \) | ||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 193.1 |
|
0 | −3.67423 | − | 3.67423i | 0 | 0 | 0 | −4.89898 | + | 4.89898i | 0 | 18.0000i | 0 | ||||||||||||||||||||||||||
| 193.2 | 0 | 3.67423 | + | 3.67423i | 0 | 0 | 0 | 4.89898 | − | 4.89898i | 0 | 18.0000i | 0 | |||||||||||||||||||||||||||
| 257.1 | 0 | −3.67423 | + | 3.67423i | 0 | 0 | 0 | −4.89898 | − | 4.89898i | 0 | − | 18.0000i | 0 | ||||||||||||||||||||||||||
| 257.2 | 0 | 3.67423 | − | 3.67423i | 0 | 0 | 0 | 4.89898 | + | 4.89898i | 0 | − | 18.0000i | 0 | ||||||||||||||||||||||||||
Inner twists
| Char | Parity | Ord | Mult | Type |
|---|---|---|---|---|
| 1.a | even | 1 | 1 | trivial |
| 5.b | even | 2 | 1 | inner |
| 5.c | odd | 4 | 2 | inner |
Twists
| By twisting character orbit | |||||||
|---|---|---|---|---|---|---|---|
| Char | Parity | Ord | Mult | Type | Twist | Min | Dim |
| 1.a | even | 1 | 1 | trivial | 400.3.p.k | 4 | |
| 4.b | odd | 2 | 1 | 100.3.f.b | ✓ | 4 | |
| 5.b | even | 2 | 1 | inner | 400.3.p.k | 4 | |
| 5.c | odd | 4 | 2 | inner | 400.3.p.k | 4 | |
| 12.b | even | 2 | 1 | 900.3.l.g | 4 | ||
| 20.d | odd | 2 | 1 | 100.3.f.b | ✓ | 4 | |
| 20.e | even | 4 | 2 | 100.3.f.b | ✓ | 4 | |
| 60.h | even | 2 | 1 | 900.3.l.g | 4 | ||
| 60.l | odd | 4 | 2 | 900.3.l.g | 4 | ||
| By twisted newform orbit | |||||||
|---|---|---|---|---|---|---|---|
| Twist | Min | Dim | Char | Parity | Ord | Mult | Type |
| 100.3.f.b | ✓ | 4 | 4.b | odd | 2 | 1 | |
| 100.3.f.b | ✓ | 4 | 20.d | odd | 2 | 1 | |
| 100.3.f.b | ✓ | 4 | 20.e | even | 4 | 2 | |
| 400.3.p.k | 4 | 1.a | even | 1 | 1 | trivial | |
| 400.3.p.k | 4 | 5.b | even | 2 | 1 | inner | |
| 400.3.p.k | 4 | 5.c | odd | 4 | 2 | inner | |
| 900.3.l.g | 4 | 12.b | even | 2 | 1 | ||
| 900.3.l.g | 4 | 60.h | even | 2 | 1 | ||
| 900.3.l.g | 4 | 60.l | odd | 4 | 2 | ||
Hecke kernels
This newform subspace can be constructed as the intersection of the kernels of the following linear operators acting on \(S_{3}^{\mathrm{new}}(400, [\chi])\):
|
\( T_{3}^{4} + 729 \)
|
|
\( T_{7}^{4} + 2304 \)
|
Hecke characteristic polynomials
| $p$ | $F_p(T)$ |
|---|---|
| $2$ |
\( T^{4} \)
|
| $3$ |
\( T^{4} + 729 \)
|
| $5$ |
\( T^{4} \)
|
| $7$ |
\( T^{4} + 2304 \)
|
| $11$ |
\( (T - 15)^{4} \)
|
| $13$ |
\( T^{4} + 144 \)
|
| $17$ |
\( T^{4} + 729 \)
|
| $19$ |
\( (T^{2} + 289)^{2} \)
|
| $23$ |
\( T^{4} + 11664 \)
|
| $29$ |
\( (T^{2} + 1764)^{2} \)
|
| $31$ |
\( (T - 14)^{4} \)
|
| $37$ |
\( T^{4} + 2985984 \)
|
| $41$ |
\( (T + 39)^{4} \)
|
| $43$ |
\( T^{4} + 1440000 \)
|
| $47$ |
\( T^{4} + 28005264 \)
|
| $53$ |
\( T^{4} + 76527504 \)
|
| $59$ |
\( (T^{2} + 36)^{2} \)
|
| $61$ |
\( (T - 92)^{4} \)
|
| $67$ |
\( T^{4} + 6365529 \)
|
| $71$ |
\( (T - 102)^{4} \)
|
| $73$ |
\( T^{4} + 729 \)
|
| $79$ |
\( (T^{2} + 10816)^{2} \)
|
| $83$ |
\( T^{4} + 20820969 \)
|
| $89$ |
\( (T^{2} + 7569)^{2} \)
|
| $97$ |
\( T^{4} + 300259584 \)
|
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