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Newspace parameters

Copy content comment:Compute space of new eigenforms
 
Copy content gp:[N,k,chi] = [1620,1,Mod(79,1620)] 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("1620.79"); S:= CuspForms(chi, 1); N := Newforms(S);
 
Copy content sage:from sage.modular.dirichlet import DirichletCharacter H = DirichletGroup(1620, base_ring=CyclotomicField(54)) chi = DirichletCharacter(H, H._module([27, 28, 27])) B = ModularForms(chi, 1).cuspidal_submodule().basis() N = [B[i] for i in range(len(B))]
 
Level: \( N \) \(=\) \( 1620 = 2^{2} \cdot 3^{4} \cdot 5 \)
Weight: \( k \) \(=\) \( 1 \)
Character orbit: \([\chi]\) \(=\) 1620.bp (of order \(54\), degree \(18\), minimal)

Newform invariants

Copy content comment:select newform
 
Copy content sage:traces = [18,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,18] f = next(g for g in N if [g.coefficient(i+1).trace() for i in range(23)] == traces)
 
Copy content gp:f = lf[1] \\ Warning: the index may be different
 
Self dual: no
Analytic conductor: \(0.808485320465\)
Analytic rank: \(0\)
Dimension: \(18\)
Coefficient field: \(\Q(\zeta_{54})\)
Copy content comment:defining polynomial
 
Copy content gp:f.mod \\ as an extension of the character field
 
Defining polynomial: \( x^{18} - x^{9} + 1 \) Copy content Toggle raw display
Coefficient ring: \(\Z[a_1, a_2]\)
Coefficient ring index: \( 1 \)
Twist minimal: yes
Projective image: \(D_{27}\)
Projective field: Galois closure of \(\mathbb{Q}[x]/(x^{27} - \cdots)\)

$q$-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)
 

The \(q\)-expansion and trace form are shown below.

\(f(q)\) \(=\) \( q - \zeta_{54}^{25} q^{2} + \zeta_{54}^{26} q^{3} - \zeta_{54}^{23} q^{4} + \zeta_{54}^{8} q^{5} + \zeta_{54}^{24} q^{6} + (\zeta_{54}^{12} - \zeta_{54}^{5}) q^{7} - \zeta_{54}^{21} q^{8} - \zeta_{54}^{25} q^{9} + \cdots + (\zeta_{54}^{22} + \cdots + \zeta_{54}^{8}) q^{98} +O(q^{100}) \) Copy content Toggle raw display
\(\operatorname{Tr}(f)(q)\) \(=\) \( 18 q + 18 q^{23} - 9 q^{41} - 9 q^{42} - 9 q^{48} - 9 q^{58} + 18 q^{67} - 9 q^{69} - 9 q^{70} + 18 q^{80} - 9 q^{83} + 18 q^{84} - 9 q^{94}+O(q^{100}) \) Copy content Toggle raw display

Character values

We give the values of \(\chi\) on generators for \(\left(\mathbb{Z}/1620\mathbb{Z}\right)^\times\).

\(n\) \(811\) \(1297\) \(1541\)
\(\chi(n)\) \(-1\) \(-1\) \(-\zeta_{54}^{23}\)

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   \(\iota_m(\nu)\) \( a_{2} \) \( a_{3} \) \( a_{4} \) \( a_{5} \) \( a_{6} \) \( a_{7} \) \( a_{8} \) \( a_{9} \) \( a_{10} \)
79.1
0.686242 − 0.727374i
−0.893633 − 0.448799i
0.993238 − 0.116093i
0.993238 + 0.116093i
0.835488 + 0.549509i
−0.973045 + 0.230616i
0.286803 + 0.957990i
0.835488 − 0.549509i
−0.396080 + 0.918216i
−0.597159 + 0.802123i
−0.893633 + 0.448799i
0.286803 − 0.957990i
−0.973045 − 0.230616i
0.0581448 + 0.998308i
−0.597159 − 0.802123i
−0.396080 − 0.918216i
0.0581448 − 0.998308i
0.686242 + 0.727374i
−0.0581448 + 0.998308i −0.686242 − 0.727374i −0.993238 − 0.116093i 0.973045 − 0.230616i 0.766044 − 0.642788i −0.342534 − 0.460103i 0.173648 − 0.984808i −0.0581448 + 0.998308i 0.173648 + 0.984808i
139.1 0.597159 − 0.802123i 0.893633 − 0.448799i −0.286803 − 0.957990i −0.835488 − 0.549509i 0.173648 − 0.984808i 0.0798028 + 0.0845860i −0.939693 − 0.342020i 0.597159 − 0.802123i −0.939693 + 0.342020i
259.1 0.973045 + 0.230616i −0.993238 − 0.116093i 0.893633 + 0.448799i 0.597159 − 0.802123i −0.939693 − 0.342020i −0.661840 − 0.435299i 0.766044 + 0.642788i 0.973045 + 0.230616i 0.766044 − 0.642788i
319.1 0.973045 − 0.230616i −0.993238 + 0.116093i 0.893633 − 0.448799i 0.597159 + 0.802123i −0.939693 + 0.342020i −0.661840 + 0.435299i 0.766044 − 0.642788i 0.973045 − 0.230616i 0.766044 + 0.642788i
439.1 0.396080 − 0.918216i −0.835488 + 0.549509i −0.686242 − 0.727374i −0.0581448 − 0.998308i 0.173648 + 0.984808i 1.73909 + 0.412172i −0.939693 + 0.342020i 0.396080 − 0.918216i −0.939693 − 0.342020i
499.1 0.893633 + 0.448799i 0.973045 + 0.230616i 0.597159 + 0.802123i −0.286803 − 0.957990i 0.766044 + 0.642788i −0.543613 − 1.26024i 0.173648 + 0.984808i 0.893633 + 0.448799i 0.173648 − 0.984808i
619.1 −0.835488 − 0.549509i −0.286803 + 0.957990i 0.396080 + 0.918216i −0.686242 − 0.727374i 0.766044 − 0.642788i −1.93293 + 0.225927i 0.173648 − 0.984808i −0.835488 − 0.549509i 0.173648 + 0.984808i
679.1 0.396080 + 0.918216i −0.835488 − 0.549509i −0.686242 + 0.727374i −0.0581448 + 0.998308i 0.173648 − 0.984808i 1.73909 − 0.412172i −0.939693 − 0.342020i 0.396080 + 0.918216i −0.939693 + 0.342020i
799.1 −0.686242 + 0.727374i 0.396080 + 0.918216i −0.0581448 − 0.998308i −0.993238 − 0.116093i −0.939693 − 0.342020i 1.06728 − 0.536009i 0.766044 + 0.642788i −0.686242 + 0.727374i 0.766044 − 0.642788i
859.1 −0.286803 + 0.957990i 0.597159 + 0.802123i −0.835488 − 0.549509i 0.396080 − 0.918216i −0.939693 + 0.342020i 0.115503 + 1.98312i 0.766044 − 0.642788i −0.286803 + 0.957990i 0.766044 + 0.642788i
979.1 0.597159 + 0.802123i 0.893633 + 0.448799i −0.286803 + 0.957990i −0.835488 + 0.549509i 0.173648 + 0.984808i 0.0798028 − 0.0845860i −0.939693 + 0.342020i 0.597159 + 0.802123i −0.939693 − 0.342020i
1039.1 −0.835488 + 0.549509i −0.286803 − 0.957990i 0.396080 − 0.918216i −0.686242 + 0.727374i 0.766044 + 0.642788i −1.93293 − 0.225927i 0.173648 + 0.984808i −0.835488 + 0.549509i 0.173648 − 0.984808i
1159.1 0.893633 − 0.448799i 0.973045 − 0.230616i 0.597159 − 0.802123i −0.286803 + 0.957990i 0.766044 − 0.642788i −0.543613 + 1.26024i 0.173648 − 0.984808i 0.893633 − 0.448799i 0.173648 + 0.984808i
1219.1 −0.993238 − 0.116093i −0.0581448 + 0.998308i 0.973045 + 0.230616i 0.893633 − 0.448799i 0.173648 − 0.984808i 0.479241 − 1.60078i −0.939693 − 0.342020i −0.993238 − 0.116093i −0.939693 + 0.342020i
1339.1 −0.286803 − 0.957990i 0.597159 − 0.802123i −0.835488 + 0.549509i 0.396080 + 0.918216i −0.939693 − 0.342020i 0.115503 − 1.98312i 0.766044 + 0.642788i −0.286803 − 0.957990i 0.766044 − 0.642788i
1399.1 −0.686242 − 0.727374i 0.396080 − 0.918216i −0.0581448 + 0.998308i −0.993238 + 0.116093i −0.939693 + 0.342020i 1.06728 + 0.536009i 0.766044 − 0.642788i −0.686242 − 0.727374i 0.766044 + 0.642788i
1519.1 −0.993238 + 0.116093i −0.0581448 − 0.998308i 0.973045 − 0.230616i 0.893633 + 0.448799i 0.173648 + 0.984808i 0.479241 + 1.60078i −0.939693 + 0.342020i −0.993238 + 0.116093i −0.939693 − 0.342020i
1579.1 −0.0581448 − 0.998308i −0.686242 + 0.727374i −0.993238 + 0.116093i 0.973045 + 0.230616i 0.766044 + 0.642788i −0.342534 + 0.460103i 0.173648 + 0.984808i −0.0581448 − 0.998308i 0.173648 − 0.984808i
\(n\): e.g. 2-40 or 80-90
Embeddings: e.g. 1-3 or 79.1
Significant digits:
Format:

Inner twists

Char Parity Ord Mult Type
1.a even 1 1 trivial
20.d odd 2 1 CM by \(\Q(\sqrt{-5}) \)
81.g even 27 1 inner
1620.bp odd 54 1 inner

Twists

       By twisting character orbit
Char Parity Ord Mult Type Twist Min Dim
1.a even 1 1 trivial 1620.1.bp.b yes 18
4.b odd 2 1 1620.1.bp.a ✓ 18
5.b even 2 1 1620.1.bp.a ✓ 18
20.d odd 2 1 CM 1620.1.bp.b yes 18
81.g even 27 1 inner 1620.1.bp.b yes 18
324.n odd 54 1 1620.1.bp.a ✓ 18
405.t even 54 1 1620.1.bp.a ✓ 18
1620.bp odd 54 1 inner 1620.1.bp.b yes 18
    
        By twisted newform orbit
Twist Min Dim Char Parity Ord Mult Type
1620.1.bp.a ✓ 18 4.b odd 2 1
1620.1.bp.a ✓ 18 5.b even 2 1
1620.1.bp.a ✓ 18 324.n odd 54 1
1620.1.bp.a ✓ 18 405.t even 54 1
1620.1.bp.b yes 18 1.a even 1 1 trivial
1620.1.bp.b yes 18 20.d odd 2 1 CM
1620.1.bp.b yes 18 81.g even 27 1 inner
1620.1.bp.b yes 18 1620.bp odd 54 1 inner

Hecke kernels

This newform subspace can be constructed as the kernel of the linear operator \( T_{7}^{18} + 3 T_{7}^{15} - 18 T_{7}^{14} + 6 T_{7}^{12} - 9 T_{7}^{11} + 99 T_{7}^{10} + 8 T_{7}^{9} + \cdots + 1 \) acting on \(S_{1}^{\mathrm{new}}(1620, [\chi])\). Copy content Toggle raw display

Hecke characteristic polynomials

$p$ $F_p(T)$
$2$ \( T^{18} + T^{9} + 1 \) Copy content Toggle raw display
$3$ \( T^{18} + T^{9} + 1 \) Copy content Toggle raw display
$5$ \( T^{18} + T^{9} + 1 \) Copy content Toggle raw display
$7$ \( T^{18} + 3 T^{15} + \cdots + 1 \) Copy content Toggle raw display
$11$ \( T^{18} \) Copy content Toggle raw display
$13$ \( T^{18} \) Copy content Toggle raw display
$17$ \( T^{18} \) Copy content Toggle raw display
$19$ \( T^{18} \) Copy content Toggle raw display
$23$ \( T^{18} - 18 T^{17} + \cdots + 1 \) Copy content Toggle raw display
$29$ \( T^{18} + 3 T^{15} + \cdots + 1 \) Copy content Toggle raw display
$31$ \( T^{18} \) Copy content Toggle raw display
$37$ \( T^{18} \) Copy content Toggle raw display
$41$ \( T^{18} + 9 T^{17} + \cdots + 1 \) Copy content Toggle raw display
$43$ \( T^{18} + 9 T^{15} + \cdots + 1 \) Copy content Toggle raw display
$47$ \( T^{18} + 3 T^{15} + \cdots + 1 \) Copy content Toggle raw display
$53$ \( T^{18} \) Copy content Toggle raw display
$59$ \( T^{18} \) Copy content Toggle raw display
$61$ \( T^{18} + 3 T^{15} + \cdots + 1 \) Copy content Toggle raw display
$67$ \( T^{18} - 18 T^{17} + \cdots + 1 \) Copy content Toggle raw display
$71$ \( T^{18} \) Copy content Toggle raw display
$73$ \( T^{18} \) Copy content Toggle raw display
$79$ \( T^{18} \) Copy content Toggle raw display
$83$ \( T^{18} + 9 T^{17} + \cdots + 1 \) Copy content Toggle raw display
$89$ \( T^{18} + 9 T^{13} + \cdots + 1 \) Copy content Toggle raw display
$97$ \( T^{18} \) Copy content Toggle raw display
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