Properties

Label 216.2.f.a
Level $216$
Weight $2$
Character orbit 216.f
Analytic conductor $1.725$
Analytic rank $0$
Dimension $8$
Inner twists $4$

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Newspace parameters

Copy content comment:Compute space of new eigenforms
 
Copy content gp:[N,k,chi] = [216,2,Mod(107,216)] mf = mfinit([N,k,chi],0) lf = mfeigenbasis(mf)
 
Copy content magma://Please install CHIMP (https://github.com/edgarcosta/CHIMP) if you want to run this code chi := DirichletCharacter("216.107"); S:= CuspForms(chi, 2); N := Newforms(S);
 
Copy content sage:from sage.modular.dirichlet import DirichletCharacter H = DirichletGroup(216, base_ring=CyclotomicField(2)) chi = DirichletCharacter(H, H._module([1, 1, 1])) N = Newforms(chi, 2, names="a")
 
Level: \( N \) \(=\) \( 216 = 2^{3} \cdot 3^{3} \)
Weight: \( k \) \(=\) \( 2 \)
Character orbit: \([\chi]\) \(=\) 216.f (of order \(2\), degree \(1\), minimal)

Newform invariants

Copy content comment:select newform
 
Copy content sage:traces = [8,0,0,-4] f = next(g for g in N if [g.coefficient(i+1).trace() for i in range(4)] == traces)
 
Copy content gp:f = lf[1] \\ Warning: the index may be different
 
Self dual: no
Analytic conductor: \(1.72476868366\)
Analytic rank: \(0\)
Dimension: \(8\)
Coefficient field: 8.0.23123460096.3
Copy content comment:defining polynomial
 
Copy content gp:f.mod \\ as an extension of the character field
 
Defining polynomial: \( x^{8} + 2x^{6} + 6x^{4} + 8x^{2} + 16 \) Copy content Toggle raw display
Coefficient ring: \(\Z[a_1, \ldots, a_{7}]\)
Coefficient ring index: \( 2^{2} \)
Twist minimal: yes
Sato-Tate group: $\mathrm{SU}(2)[C_{2}]$

$q$-expansion

Copy content comment:q-expansion
 
Copy content sage:f.q_expansion() # note that sage often uses an isomorphic number field
 
Copy content gp:mfcoefs(f, 20)
 

Coefficients of the \(q\)-expansion are expressed in terms of a basis \(1,\beta_1,\ldots,\beta_{7}\) for the coefficient ring described below. We also show the integral \(q\)-expansion of the trace form.

\(f(q)\) \(=\) \( q + \beta_{3} q^{2} + ( - \beta_{4} - \beta_1 - 1) q^{4} + \beta_{2} q^{5} + \beta_{6} q^{7} + (\beta_{7} - \beta_{3} + \beta_{2}) q^{8} + ( - \beta_{6} - \beta_{4}) q^{10} + (\beta_{7} + \beta_{5} + \beta_{2}) q^{11}+ \cdots + (4 \beta_{5} - 2 \beta_{3} + 4 \beta_{2}) q^{98}+O(q^{100}) \) Copy content Toggle raw display
\(\operatorname{Tr}(f)(q)\) \(=\) \( 8 q - 4 q^{4} - 16 q^{16} + 16 q^{19} - 8 q^{22} + 8 q^{25} - 12 q^{28} - 32 q^{34} + 24 q^{40} + 16 q^{43} - 24 q^{46} - 16 q^{49} + 36 q^{52} + 48 q^{58} + 8 q^{64} - 32 q^{67} + 72 q^{70} - 8 q^{73}+ \cdots - 8 q^{97}+O(q^{100}) \) Copy content Toggle raw display

Basis of coefficient ring in terms of a root \(\nu\) of \( x^{8} + 2x^{6} + 6x^{4} + 8x^{2} + 16 \) : Copy content Toggle raw display

\(\beta_{1}\)\(=\) \( \nu^{2} \) Copy content Toggle raw display
\(\beta_{2}\)\(=\) \( ( \nu^{5} + 2\nu ) / 2 \) Copy content Toggle raw display
\(\beta_{3}\)\(=\) \( ( \nu^{7} + 2\nu^{5} + 6\nu^{3} + 8\nu ) / 8 \) Copy content Toggle raw display
\(\beta_{4}\)\(=\) \( ( \nu^{6} + 2\nu^{4} + 2\nu^{2} + 4 ) / 4 \) Copy content Toggle raw display
\(\beta_{5}\)\(=\) \( ( -\nu^{7} - 2\nu^{5} + 2\nu^{3} - 8\nu ) / 8 \) Copy content Toggle raw display
\(\beta_{6}\)\(=\) \( ( -\nu^{6} + 2\nu^{4} - 2\nu^{2} + 4 ) / 4 \) Copy content Toggle raw display
\(\beta_{7}\)\(=\) \( ( -\nu^{7} - 2\nu^{5} + 2\nu^{3} + 8\nu ) / 8 \) Copy content Toggle raw display
\(\nu\)\(=\) \( ( \beta_{7} - \beta_{5} ) / 2 \) Copy content Toggle raw display
\(\nu^{2}\)\(=\) \( \beta_1 \) Copy content Toggle raw display
\(\nu^{3}\)\(=\) \( \beta_{5} + \beta_{3} \) Copy content Toggle raw display
\(\nu^{4}\)\(=\) \( \beta_{6} + \beta_{4} - 2 \) Copy content Toggle raw display
\(\nu^{5}\)\(=\) \( -\beta_{7} + \beta_{5} + 2\beta_{2} \) Copy content Toggle raw display
\(\nu^{6}\)\(=\) \( -2\beta_{6} + 2\beta_{4} - 2\beta_1 \) Copy content Toggle raw display
\(\nu^{7}\)\(=\) \( -2\beta_{7} - 4\beta_{5} + 2\beta_{3} - 4\beta_{2} \) Copy content Toggle raw display

Character values

We give the values of \(\chi\) on generators for \(\left(\mathbb{Z}/216\mathbb{Z}\right)^\times\).

\(n\) \(55\) \(109\) \(137\)
\(\chi(n)\) \(-1\) \(-1\) \(-1\)

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.

Copy content comment:embeddings in the coefficient field
 
Copy content gp:mfembed(f)
 
Label   \(\iota_m(\nu)\) \( a_{2} \) \( a_{3} \) \( a_{4} \) \( a_{5} \) \( a_{6} \) \( a_{7} \) \( a_{8} \) \( a_{9} \) \( a_{10} \)
107.1
1.08766 0.903873i
1.08766 + 0.903873i
0.563016 1.29731i
0.563016 + 1.29731i
−0.563016 1.29731i
−0.563016 + 1.29731i
−1.08766 0.903873i
−1.08766 + 0.903873i
−1.08766 0.903873i 0 0.366025 + 1.96622i −1.59245 0 1.43937i 1.37910 2.46943i 0 1.73205 + 1.43937i
107.2 −1.08766 + 0.903873i 0 0.366025 1.96622i −1.59245 0 1.43937i 1.37910 + 2.46943i 0 1.73205 1.43937i
107.3 −0.563016 1.29731i 0 −1.36603 + 1.46081i 3.07638 0 3.99102i 2.66422 + 0.949697i 0 −1.73205 3.99102i
107.4 −0.563016 + 1.29731i 0 −1.36603 1.46081i 3.07638 0 3.99102i 2.66422 0.949697i 0 −1.73205 + 3.99102i
107.5 0.563016 1.29731i 0 −1.36603 1.46081i −3.07638 0 3.99102i −2.66422 + 0.949697i 0 −1.73205 + 3.99102i
107.6 0.563016 + 1.29731i 0 −1.36603 + 1.46081i −3.07638 0 3.99102i −2.66422 0.949697i 0 −1.73205 3.99102i
107.7 1.08766 0.903873i 0 0.366025 1.96622i 1.59245 0 1.43937i −1.37910 2.46943i 0 1.73205 1.43937i
107.8 1.08766 + 0.903873i 0 0.366025 + 1.96622i 1.59245 0 1.43937i −1.37910 + 2.46943i 0 1.73205 + 1.43937i
\(n\): e.g. 2-40 or 990-1000
Embeddings: e.g. 1-3 or 107.8
Significant digits:
Format:

Inner twists

Char Parity Ord Mult Type
1.a even 1 1 trivial
3.b odd 2 1 inner
8.d odd 2 1 inner
24.f even 2 1 inner

Twists

       By twisting character orbit
Char Parity Ord Mult Type Twist Min Dim
1.a even 1 1 trivial 216.2.f.a 8
3.b odd 2 1 inner 216.2.f.a 8
4.b odd 2 1 864.2.f.a 8
8.b even 2 1 864.2.f.a 8
8.d odd 2 1 inner 216.2.f.a 8
9.c even 3 2 648.2.l.f 16
9.d odd 6 2 648.2.l.f 16
12.b even 2 1 864.2.f.a 8
24.f even 2 1 inner 216.2.f.a 8
24.h odd 2 1 864.2.f.a 8
36.f odd 6 2 2592.2.p.f 16
36.h even 6 2 2592.2.p.f 16
72.j odd 6 2 2592.2.p.f 16
72.l even 6 2 648.2.l.f 16
72.n even 6 2 2592.2.p.f 16
72.p odd 6 2 648.2.l.f 16
    
        By twisted newform orbit
Twist Min Dim Char Parity Ord Mult Type
216.2.f.a 8 1.a even 1 1 trivial
216.2.f.a 8 3.b odd 2 1 inner
216.2.f.a 8 8.d odd 2 1 inner
216.2.f.a 8 24.f even 2 1 inner
648.2.l.f 16 9.c even 3 2
648.2.l.f 16 9.d odd 6 2
648.2.l.f 16 72.l even 6 2
648.2.l.f 16 72.p odd 6 2
864.2.f.a 8 4.b odd 2 1
864.2.f.a 8 8.b even 2 1
864.2.f.a 8 12.b even 2 1
864.2.f.a 8 24.h odd 2 1
2592.2.p.f 16 36.f odd 6 2
2592.2.p.f 16 36.h even 6 2
2592.2.p.f 16 72.j odd 6 2
2592.2.p.f 16 72.n even 6 2

Hecke kernels

This newform subspace can be constructed as the kernel of the linear operator \( T_{5}^{4} - 12T_{5}^{2} + 24 \) acting on \(S_{2}^{\mathrm{new}}(216, [\chi])\). Copy content Toggle raw display

Hecke characteristic polynomials

$p$ $F_p(T)$
$2$ \( T^{8} + 2 T^{6} + \cdots + 16 \) Copy content Toggle raw display
$3$ \( T^{8} \) Copy content Toggle raw display
$5$ \( (T^{4} - 12 T^{2} + 24)^{2} \) Copy content Toggle raw display
$7$ \( (T^{4} + 18 T^{2} + 33)^{2} \) Copy content Toggle raw display
$11$ \( (T^{4} + 28 T^{2} + 88)^{2} \) Copy content Toggle raw display
$13$ \( (T^{4} + 30 T^{2} + 33)^{2} \) Copy content Toggle raw display
$17$ \( (T^{4} + 52 T^{2} + 88)^{2} \) Copy content Toggle raw display
$19$ \( (T^{2} - 4 T + 1)^{4} \) Copy content Toggle raw display
$23$ \( (T^{4} - 36 T^{2} + 24)^{2} \) Copy content Toggle raw display
$29$ \( (T^{4} - 96 T^{2} + 1536)^{2} \) Copy content Toggle raw display
$31$ \( (T^{4} + 96 T^{2} + 2112)^{2} \) Copy content Toggle raw display
$37$ \( (T^{4} + 54 T^{2} + 297)^{2} \) Copy content Toggle raw display
$41$ \( (T^{4} + 112 T^{2} + 1408)^{2} \) Copy content Toggle raw display
$43$ \( (T - 2)^{8} \) Copy content Toggle raw display
$47$ \( (T^{4} - 132 T^{2} + 4056)^{2} \) Copy content Toggle raw display
$53$ \( (T^{4} - 144 T^{2} + 3456)^{2} \) Copy content Toggle raw display
$59$ \( (T^{4} + 28 T^{2} + 88)^{2} \) Copy content Toggle raw display
$61$ \( (T^{4} + 30 T^{2} + 33)^{2} \) Copy content Toggle raw display
$67$ \( (T^{2} + 8 T - 11)^{4} \) Copy content Toggle raw display
$71$ \( (T^{4} - 144 T^{2} + 3456)^{2} \) Copy content Toggle raw display
$73$ \( (T^{2} + 2 T - 47)^{4} \) Copy content Toggle raw display
$79$ \( (T^{4} + 186 T^{2} + 5577)^{2} \) Copy content Toggle raw display
$83$ \( (T^{4} + 160 T^{2} + 5632)^{2} \) Copy content Toggle raw display
$89$ \( (T^{4} + 436 T^{2} + 46552)^{2} \) Copy content Toggle raw display
$97$ \( (T^{2} + 2 T - 107)^{4} \) Copy content Toggle raw display
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