Newspace parameters
comment: Compute space of new eigenforms
[N,k,chi] = [2400,4,Mod(1,2400)]
mf = mfinit([N,k,chi],0)
lf = mfeigenbasis(mf)
from sage.modular.dirichlet import DirichletCharacter
H = DirichletGroup(2400, 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("2400.1");
S:= CuspForms(chi, 4);
N := Newforms(S);
| Level: | \( N \) | \(=\) | \( 2400 = 2^{5} \cdot 3 \cdot 5^{2} \) |
| Weight: | \( k \) | \(=\) | \( 4 \) |
| Character orbit: | \([\chi]\) | \(=\) | 2400.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: | \(141.604584014\) |
| Analytic rank: | \(1\) |
| Dimension: | \(4\) |
| Coefficient field: | 4.4.1965645.1 |
|
comment: defining polynomial
gp: f.mod \\ as an extension of the character field
|
|
| Defining polynomial: |
\( x^{4} - x^{3} - 43x^{2} + 100x - 32 \)
|
| Coefficient ring: | \(\Z[a_1, \ldots, a_{13}]\) |
| Coefficient ring index: | \( 2^{6} \) |
| Twist minimal: | no (minimal twist has level 480) |
| 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
\( x^{4} - x^{3} - 43x^{2} + 100x - 32 \)
:
| \(\beta_{1}\) | \(=\) |
\( ( \nu^{3} + 5\nu^{2} - 33\nu - 58 ) / 5 \)
|
| \(\beta_{2}\) | \(=\) |
\( ( -2\nu^{3} + 96\nu - 109 ) / 5 \)
|
| \(\beta_{3}\) | \(=\) |
\( ( 4\nu^{3} - 152\nu + 208 ) / 5 \)
|
| \(\nu\) | \(=\) |
\( ( \beta_{3} + 2\beta_{2} + 2 ) / 8 \)
|
| \(\nu^{2}\) | \(=\) |
\( ( -3\beta_{3} - 2\beta_{2} + 8\beta _1 + 174 ) / 8 \)
|
| \(\nu^{3}\) | \(=\) |
\( ( 12\beta_{3} + 19\beta_{2} - 85 ) / 2 \)
|
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 | 3.00000 | 0 | 0 | 0 | −17.4568 | 0 | 9.00000 | 0 | ||||||||||||||||||||||||||||||
| 1.2 | 0 | 3.00000 | 0 | 0 | 0 | −17.4568 | 0 | 9.00000 | 0 | |||||||||||||||||||||||||||||||
| 1.3 | 0 | 3.00000 | 0 | 0 | 0 | 11.4568 | 0 | 9.00000 | 0 | |||||||||||||||||||||||||||||||
| 1.4 | 0 | 3.00000 | 0 | 0 | 0 | 11.4568 | 0 | 9.00000 | 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 |
| 20.d | odd | 2 | 1 | inner |
Twists
| By twisting character orbit | |||||||
|---|---|---|---|---|---|---|---|
| Char | Parity | Ord | Mult | Type | Twist | Min | Dim |
| 1.a | even | 1 | 1 | trivial | 2400.4.a.cb | 4 | |
| 4.b | odd | 2 | 1 | 2400.4.a.by | 4 | ||
| 5.b | even | 2 | 1 | 2400.4.a.by | 4 | ||
| 5.c | odd | 4 | 2 | 480.4.f.g | ✓ | 8 | |
| 15.e | even | 4 | 2 | 1440.4.f.l | 8 | ||
| 20.d | odd | 2 | 1 | inner | 2400.4.a.cb | 4 | |
| 20.e | even | 4 | 2 | 480.4.f.g | ✓ | 8 | |
| 40.i | odd | 4 | 2 | 960.4.f.t | 8 | ||
| 40.k | even | 4 | 2 | 960.4.f.t | 8 | ||
| 60.l | odd | 4 | 2 | 1440.4.f.l | 8 | ||
| By twisted newform orbit | |||||||
|---|---|---|---|---|---|---|---|
| Twist | Min | Dim | Char | Parity | Ord | Mult | Type |
| 480.4.f.g | ✓ | 8 | 5.c | odd | 4 | 2 | |
| 480.4.f.g | ✓ | 8 | 20.e | even | 4 | 2 | |
| 960.4.f.t | 8 | 40.i | odd | 4 | 2 | ||
| 960.4.f.t | 8 | 40.k | even | 4 | 2 | ||
| 1440.4.f.l | 8 | 15.e | even | 4 | 2 | ||
| 1440.4.f.l | 8 | 60.l | odd | 4 | 2 | ||
| 2400.4.a.by | 4 | 4.b | odd | 2 | 1 | ||
| 2400.4.a.by | 4 | 5.b | even | 2 | 1 | ||
| 2400.4.a.cb | 4 | 1.a | even | 1 | 1 | trivial | |
| 2400.4.a.cb | 4 | 20.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 \(S_{4}^{\mathrm{new}}(\Gamma_0(2400))\):
|
\( T_{7}^{2} + 6T_{7} - 200 \)
|
|
\( T_{11}^{4} - 1380T_{11}^{2} + 288000 \)
|
Hecke characteristic polynomials
| $p$ | $F_p(T)$ |
|---|---|
| $2$ |
\( T^{4} \)
|
| $3$ |
\( (T - 3)^{4} \)
|
| $5$ |
\( T^{4} \)
|
| $7$ |
\( (T^{2} + 6 T - 200)^{2} \)
|
| $11$ |
\( T^{4} - 1380 T^{2} + 288000 \)
|
| $13$ |
\( T^{4} - 5556 T^{2} + 486720 \)
|
| $17$ |
\( T^{4} - 11364 T^{2} + 6094080 \)
|
| $19$ |
\( T^{4} - 2256 T^{2} + 1152000 \)
|
| $23$ |
\( (T^{2} + 52 T - 6848)^{2} \)
|
| $29$ |
\( (T^{2} + 222 T - 4608)^{2} \)
|
| $31$ |
\( T^{4} + \cdots + 5709496320 \)
|
| $37$ |
\( T^{4} + \cdots + 3976200000 \)
|
| $41$ |
\( (T^{2} + 48 T - 260)^{2} \)
|
| $43$ |
\( (T^{2} - 120 T - 49904)^{2} \)
|
| $47$ |
\( (T^{2} + 400 T + 9904)^{2} \)
|
| $53$ |
\( T^{4} + \cdots + 1096384320 \)
|
| $59$ |
\( T^{4} + \cdots + 33019188480 \)
|
| $61$ |
\( (T^{2} + 252 T - 465660)^{2} \)
|
| $67$ |
\( (T^{2} + 492 T + 39616)^{2} \)
|
| $71$ |
\( T^{4} + \cdots + 36172615680 \)
|
| $73$ |
\( T^{4} + \cdots + 12556062720 \)
|
| $79$ |
\( T^{4} + \cdots + 806669844480 \)
|
| $83$ |
\( (T^{2} + 400 T - 230864)^{2} \)
|
| $89$ |
\( (T^{2} - 468 T - 697644)^{2} \)
|
| $97$ |
\( T^{4} + \cdots + 8206110720 \)
|
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