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gp:[N,k,chi] = [3840,1,Mod(929,3840)]
mf = mfinit([N,k,chi],0)
lf = mfeigenbasis(mf)
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magma://Please install CHIMP (https://github.com/edgarcosta/CHIMP) if you want to run this code
chi := DirichletCharacter("3840.929");
S:= CuspForms(chi, 1);
N := Newforms(S);
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sage:from sage.modular.dirichlet import DirichletCharacter
H = DirichletGroup(3840, base_ring=CyclotomicField(8))
chi = DirichletCharacter(H, H._module([0, 3, 4, 4]))
B = ModularForms(chi, 1).cuspidal_submodule().basis()
N = [B[i] for i in range(len(B))]
Newform invariants
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sage:traces = [8,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,8]
f = next(g for g in N if [g.coefficient(i+1).trace() for i in range(51)] == traces)
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gp:f = lf[1] \\ Warning: the index may be different
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sage:f.q_expansion() # note that sage often uses an isomorphic number field
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gp:mfcoefs(f, 20)
The \(q\)-expansion and trace form are shown below.
Character values
We give the values of \(\chi\) on generators for \(\left(\mathbb{Z}/3840\mathbb{Z}\right)^\times\).
| \(n\) |
\(511\) |
\(1537\) |
\(2561\) |
\(2821\) |
| \(\chi(n)\) |
\(1\) |
\(-1\) |
\(-1\) |
\(\zeta_{16}^{6}\) |
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.
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gp:mfembed(f)
This newform subspace can be constructed as the kernel of the linear operator
\( T_{19}^{4} + 2T_{19}^{2} - 4T_{19} + 2 \)
acting on \(S_{1}^{\mathrm{new}}(3840, [\chi])\).
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| $p$ |
$F_p(T)$ |
| $2$ |
\( T^{8} \)
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| $3$ |
\( T^{8} + 1 \)
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| $5$ |
\( T^{8} + 1 \)
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| $7$ |
\( T^{8} \)
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|
| $11$ |
\( T^{8} \)
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|
| $13$ |
\( T^{8} \)
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|
| $17$ |
\( (T^{4} + 4 T^{2} + 2)^{2} \)
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|
| $19$ |
\( (T^{4} + 2 T^{2} - 4 T + 2)^{2} \)
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| $23$ |
\( T^{8} + 12T^{4} + 4 \)
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| $29$ |
\( T^{8} \)
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| $31$ |
\( (T^{2} - 2)^{4} \)
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| $37$ |
\( T^{8} \)
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| $41$ |
\( T^{8} \)
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| $43$ |
\( T^{8} \)
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| $47$ |
\( (T^{4} + 4 T^{2} + 2)^{2} \)
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|
| $53$ |
\( T^{8} + 16 \)
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| $59$ |
\( T^{8} \)
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| $61$ |
\( (T^{4} - 4 T^{3} + 6 T^{2} + \cdots + 2)^{2} \)
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|
| $67$ |
\( T^{8} \)
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| $71$ |
\( T^{8} \)
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| $73$ |
\( T^{8} \)
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| $79$ |
\( T^{8} \)
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| $83$ |
\( T^{8} + 16 \)
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|
| $89$ |
\( T^{8} \)
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| $97$ |
\( T^{8} \)
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