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gp:[N,k,chi] = [126,8,Mod(1,126)]
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("126.1");
S:= CuspForms(chi, 8);
N := Newforms(S);
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sage:from sage.modular.dirichlet import DirichletCharacter
H = DirichletGroup(126, base_ring=CyclotomicField(2))
chi = DirichletCharacter(H, H._module([0, 0]))
N = Newforms(chi, 8, names="a")
Newform invariants
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sage:traces = [2,-16,0,128,56]
f = next(g for g in N if [g.coefficient(i+1).trace() for i in range(5)] == 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)
Coefficients of the \(q\)-expansion are expressed in terms of \(\beta = 6\sqrt{499}\).
We also show the integral \(q\)-expansion of the trace form.
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)
| \( p \) |
Sign
|
| \(2\) |
\( +1 \) |
| \(3\) |
\( +1 \) |
| \(7\) |
\( +1 \) |
This newform does not admit any (nontrivial) inner twists.
This newform subspace can be constructed as the kernel of the linear operator
\( T_{5}^{2} - 56T_{5} - 17180 \)
acting on \(S_{8}^{\mathrm{new}}(\Gamma_0(126))\).
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| $p$ |
$F_p(T)$ |
| $2$ |
\( (T + 8)^{2} \)
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|
| $3$ |
\( T^{2} \)
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|
| $5$ |
\( T^{2} - 56T - 17180 \)
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|
| $7$ |
\( (T + 343)^{2} \)
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|
| $11$ |
\( T^{2} - 3016 T - 5648060 \)
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|
| $13$ |
\( T^{2} + 4284 T - 134525052 \)
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|
| $17$ |
\( T^{2} - 22792 T - 197525084 \)
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|
| $19$ |
\( T^{2} + \cdots - 1047280112 \)
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|
| $23$ |
\( T^{2} + \cdots - 2163137948 \)
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|
| $29$ |
\( T^{2} + \cdots - 39554773184 \)
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|
| $31$ |
\( T^{2} + \cdots + 11760496272 \)
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|
| $37$ |
\( T^{2} + \cdots - 129454449500 \)
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|
| $41$ |
\( T^{2} + \cdots - 144288297468 \)
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|
| $43$ |
\( T^{2} + \cdots - 134132111216 \)
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|
| $47$ |
\( T^{2} + \cdots + 699327068688 \)
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|
| $53$ |
\( T^{2} + \cdots + 281599875216 \)
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|
| $59$ |
\( T^{2} + \cdots + 639834821008 \)
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|
| $61$ |
\( T^{2} + \cdots + 2216323599012 \)
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|
| $67$ |
\( T^{2} + \cdots + 1462529789200 \)
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|
| $71$ |
\( T^{2} + \cdots + 6072438504580 \)
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|
| $73$ |
\( T^{2} + \cdots - 8979931120892 \)
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|
| $79$ |
\( T^{2} + \cdots - 4275555115968 \)
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|
| $83$ |
\( T^{2} + \cdots - 15717088167680 \)
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|
| $89$ |
\( T^{2} + \cdots + 49678412623524 \)
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|
| $97$ |
\( T^{2} + \cdots + 20756643857284 \)
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