Newspace parameters
comment: Compute space of new eigenforms
[N,k,chi] = [7200,2,Mod(2449,7200)]
mf = mfinit([N,k,chi],0)
lf = mfeigenbasis(mf)
from sage.modular.dirichlet import DirichletCharacter
H = DirichletGroup(7200, base_ring=CyclotomicField(2))
chi = DirichletCharacter(H, H._module([0, 1, 0, 1]))
N = Newforms(chi, 2, names="a")
//Please install CHIMP (https://github.com/edgarcosta/CHIMP) if you want to run this code
chi := DirichletCharacter("7200.2449");
S:= CuspForms(chi, 2);
N := Newforms(S);
| Level: | \( N \) | \(=\) | \( 7200 = 2^{5} \cdot 3^{2} \cdot 5^{2} \) |
| Weight: | \( k \) | \(=\) | \( 2 \) |
| Character orbit: | \([\chi]\) | \(=\) | 7200.d (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: | \(57.4922894553\) |
| Analytic rank: | \(0\) |
| Dimension: | \(4\) |
| Coefficient field: | \(\Q(\zeta_{8})\) |
|
comment: defining polynomial
gp: f.mod \\ as an extension of the character field
|
|
| Defining polynomial: |
\( x^{4} + 1 \)
|
| Coefficient ring: | \(\Z[a_1, \ldots, a_{53}]\) |
| Coefficient ring index: | \( 2^{4} \) |
| Twist minimal: | no (minimal twist has level 72) |
| Sato-Tate group: | $\mathrm{U}(1)[D_{2}]$ |
$q$-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
| \(\beta_{1}\) | \(=\) |
\( 2\zeta_{8}^{2} \)
|
| \(\beta_{2}\) | \(=\) |
\( 2\zeta_{8}^{3} + 2\zeta_{8} \)
|
| \(\beta_{3}\) | \(=\) |
\( -2\zeta_{8}^{3} + 2\zeta_{8} \)
|
| \(\zeta_{8}\) | \(=\) |
\( ( \beta_{3} + \beta_{2} ) / 4 \)
|
| \(\zeta_{8}^{2}\) | \(=\) |
\( ( \beta_1 ) / 2 \)
|
| \(\zeta_{8}^{3}\) | \(=\) |
\( ( -\beta_{3} + \beta_{2} ) / 4 \)
|
Character values
We give the values of \(\chi\) on generators for \(\left(\mathbb{Z}/7200\mathbb{Z}\right)^\times\).
| \(n\) | \(577\) | \(901\) | \(6401\) | \(6751\) |
| \(\chi(n)\) | \(-1\) | \(-1\) | \(1\) | \(1\) |
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 | \(\iota_m(\nu)\) | \( a_{2} \) | \( a_{3} \) | \( a_{4} \) | \( a_{5} \) | \( a_{6} \) | \( a_{7} \) | \( a_{8} \) | \( a_{9} \) | \( a_{10} \) | ||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2449.1 |
|
0 | 0 | 0 | 0 | 0 | − | 2.00000i | 0 | 0 | 0 | |||||||||||||||||||||||||||||
| 2449.2 | 0 | 0 | 0 | 0 | 0 | − | 2.00000i | 0 | 0 | 0 | ||||||||||||||||||||||||||||||
| 2449.3 | 0 | 0 | 0 | 0 | 0 | 2.00000i | 0 | 0 | 0 | |||||||||||||||||||||||||||||||
| 2449.4 | 0 | 0 | 0 | 0 | 0 | 2.00000i | 0 | 0 | 0 | |||||||||||||||||||||||||||||||
Inner twists
| Char | Parity | Ord | Mult | Type |
|---|---|---|---|---|
| 1.a | even | 1 | 1 | trivial |
| 24.h | odd | 2 | 1 | CM by \(\Q(\sqrt{-6}) \) |
| 3.b | odd | 2 | 1 | inner |
| 5.b | even | 2 | 1 | inner |
| 8.b | even | 2 | 1 | inner |
| 15.d | odd | 2 | 1 | inner |
| 40.f | even | 2 | 1 | inner |
| 120.i | odd | 2 | 1 | inner |
Twists
Hecke kernels
This newform subspace can be constructed as the intersection of the kernels of the following linear operators acting on \(S_{2}^{\mathrm{new}}(7200, [\chi])\):
|
\( T_{7}^{2} + 4 \)
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\( T_{11}^{2} + 32 \)
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\( T_{13} \)
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\( T_{37} \)
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\( T_{41} \)
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\( T_{53}^{2} - 200 \)
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Hecke characteristic polynomials
| $p$ | $F_p(T)$ |
|---|---|
| $2$ |
\( T^{4} \)
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| $3$ |
\( T^{4} \)
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| $5$ |
\( T^{4} \)
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| $7$ |
\( (T^{2} + 4)^{2} \)
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| $11$ |
\( (T^{2} + 32)^{2} \)
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| $13$ |
\( T^{4} \)
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| $17$ |
\( T^{4} \)
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| $19$ |
\( T^{4} \)
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| $23$ |
\( T^{4} \)
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| $29$ |
\( (T^{2} + 8)^{2} \)
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| $31$ |
\( (T - 10)^{4} \)
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| $37$ |
\( T^{4} \)
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| $41$ |
\( T^{4} \)
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| $43$ |
\( T^{4} \)
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| $47$ |
\( T^{4} \)
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| $53$ |
\( (T^{2} - 200)^{2} \)
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| $59$ |
\( (T^{2} + 128)^{2} \)
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| $61$ |
\( T^{4} \)
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| $67$ |
\( T^{4} \)
|
| $71$ |
\( T^{4} \)
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| $73$ |
\( (T^{2} + 196)^{2} \)
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| $79$ |
\( (T + 10)^{4} \)
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| $83$ |
\( (T^{2} - 32)^{2} \)
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| $89$ |
\( T^{4} \)
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| $97$ |
\( (T^{2} + 4)^{2} \)
|
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