Newspace parameters
comment: Compute space of new eigenforms
[N,k,chi] = [1800,4,Mod(1,1800)]
mf = mfinit([N,k,chi],0)
lf = mfeigenbasis(mf)
from sage.modular.dirichlet import DirichletCharacter
H = DirichletGroup(1800, base_ring=CyclotomicField(2))
chi = DirichletCharacter(H, H._module([0, 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("1800.1");
S:= CuspForms(chi, 4);
N := Newforms(S);
| Level: | \( N \) | \(=\) | \( 1800 = 2^{3} \cdot 3^{2} \cdot 5^{2} \) |
| Weight: | \( k \) | \(=\) | \( 4 \) |
| Character orbit: | \([\chi]\) | \(=\) | 1800.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: | \(106.203438010\) |
| Analytic rank: | \(0\) |
| Dimension: | \(4\) |
| Coefficient field: | \(\Q(\sqrt{6}, \sqrt{46})\) |
|
comment: defining polynomial
gp: f.mod \\ as an extension of the character field
|
|
| Defining polynomial: |
\( x^{4} - 26x^{2} + 100 \)
|
| Coefficient ring: | \(\Z[a_1, \ldots, a_{17}]\) |
| Coefficient ring index: | \( 2^{7} \) |
| Twist minimal: | no (minimal twist has level 360) |
| 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
\( x^{4} - 26x^{2} + 100 \)
:
| \(\beta_{1}\) | \(=\) |
\( ( 2\nu^{3} - 52\nu ) / 5 \)
|
| \(\beta_{2}\) | \(=\) |
\( ( 4\nu^{3} - 64\nu ) / 5 \)
|
| \(\beta_{3}\) | \(=\) |
\( 2\nu^{2} - 26 \)
|
| \(\nu\) | \(=\) |
\( ( \beta_{2} - 2\beta_1 ) / 8 \)
|
| \(\nu^{2}\) | \(=\) |
\( ( \beta_{3} + 26 ) / 2 \)
|
| \(\nu^{3}\) | \(=\) |
\( ( 13\beta_{2} - 16\beta_1 ) / 4 \)
|
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 | 0 | 0 | −28.2616 | 0 | 0 | 0 | ||||||||||||||||||||||||||||||
| 1.2 | 0 | 0 | 0 | 0 | 0 | −1.13228 | 0 | 0 | 0 | |||||||||||||||||||||||||||||||
| 1.3 | 0 | 0 | 0 | 0 | 0 | 1.13228 | 0 | 0 | 0 | |||||||||||||||||||||||||||||||
| 1.4 | 0 | 0 | 0 | 0 | 0 | 28.2616 | 0 | 0 | 0 | |||||||||||||||||||||||||||||||
Atkin-Lehner signs
| \( p \) | Sign |
|---|---|
| \(2\) | \(-1\) |
| \(3\) | \(1\) |
| \(5\) | \(-1\) |
Inner twists
| Char | Parity | Ord | Mult | Type |
|---|---|---|---|---|
| 1.a | even | 1 | 1 | trivial |
| 15.d | odd | 2 | 1 | inner |
Twists
| By twisting character orbit | |||||||
|---|---|---|---|---|---|---|---|
| Char | Parity | Ord | Mult | Type | Twist | Min | Dim |
| 1.a | even | 1 | 1 | trivial | 1800.4.a.bw | 4 | |
| 3.b | odd | 2 | 1 | 1800.4.a.bv | 4 | ||
| 5.b | even | 2 | 1 | 1800.4.a.bv | 4 | ||
| 5.c | odd | 4 | 2 | 360.4.f.f | ✓ | 8 | |
| 15.d | odd | 2 | 1 | inner | 1800.4.a.bw | 4 | |
| 15.e | even | 4 | 2 | 360.4.f.f | ✓ | 8 | |
| 20.e | even | 4 | 2 | 720.4.f.n | 8 | ||
| 60.l | odd | 4 | 2 | 720.4.f.n | 8 | ||
| By twisted newform orbit | |||||||
|---|---|---|---|---|---|---|---|
| Twist | Min | Dim | Char | Parity | Ord | Mult | Type |
| 360.4.f.f | ✓ | 8 | 5.c | odd | 4 | 2 | |
| 360.4.f.f | ✓ | 8 | 15.e | even | 4 | 2 | |
| 720.4.f.n | 8 | 20.e | even | 4 | 2 | ||
| 720.4.f.n | 8 | 60.l | odd | 4 | 2 | ||
| 1800.4.a.bv | 4 | 3.b | odd | 2 | 1 | ||
| 1800.4.a.bv | 4 | 5.b | even | 2 | 1 | ||
| 1800.4.a.bw | 4 | 1.a | even | 1 | 1 | trivial | |
| 1800.4.a.bw | 4 | 15.d | odd | 2 | 1 | inner | |
Hecke kernels
This newform subspace can be constructed as the intersection of the kernels of the following linear operators acting on \(S_{4}^{\mathrm{new}}(\Gamma_0(1800))\):
|
\( T_{7}^{4} - 800T_{7}^{2} + 1024 \)
|
|
\( T_{11}^{4} - 2720T_{11}^{2} + 984064 \)
|
|
\( T_{17}^{2} - 24T_{17} - 132 \)
|
Hecke characteristic polynomials
| $p$ | $F_p(T)$ |
|---|---|
| $2$ |
\( T^{4} \)
|
| $3$ |
\( T^{4} \)
|
| $5$ |
\( T^{4} \)
|
| $7$ |
\( T^{4} - 800T^{2} + 1024 \)
|
| $11$ |
\( T^{4} - 2720 T^{2} + 984064 \)
|
| $13$ |
\( T^{4} - 1568 T^{2} + 173056 \)
|
| $17$ |
\( (T^{2} - 24 T - 132)^{2} \)
|
| $19$ |
\( (T^{2} - 40 T - 4016)^{2} \)
|
| $23$ |
\( (T^{2} - 32 T - 848)^{2} \)
|
| $29$ |
\( T^{4} - 46496 T^{2} + 523494400 \)
|
| $31$ |
\( (T^{2} + 96 T - 37440)^{2} \)
|
| $37$ |
\( T^{4} + \cdots + 8701158400 \)
|
| $41$ |
\( T^{4} + \cdots + 2182758400 \)
|
| $43$ |
\( T^{4} + \cdots + 8493465600 \)
|
| $47$ |
\( (T^{2} - 192 T - 18384)^{2} \)
|
| $53$ |
\( (T^{2} + 8 T - 79748)^{2} \)
|
| $59$ |
\( T^{4} + \cdots + 3739567104 \)
|
| $61$ |
\( (T^{2} + 332 T - 255068)^{2} \)
|
| $67$ |
\( T^{4} + \cdots + 436402929664 \)
|
| $71$ |
\( T^{4} + \cdots + 14880096256 \)
|
| $73$ |
\( T^{4} + \cdots + 5360582656 \)
|
| $79$ |
\( (T^{2} - 560 T - 137984)^{2} \)
|
| $83$ |
\( (T^{2} - 928 T - 531008)^{2} \)
|
| $89$ |
\( T^{4} + \cdots + 135895449600 \)
|
| $97$ |
\( T^{4} + \cdots + 1032208384 \)
|
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