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Newspace parameters

Copy content comment:Compute space of new eigenforms
 
Copy content gp:[N,k,chi] = [50,8,Mod(49,50)] 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("50.49"); S:= CuspForms(chi, 8); N := Newforms(S);
 
Copy content sage:from sage.modular.dirichlet import DirichletCharacter H = DirichletGroup(50, base_ring=CyclotomicField(2)) chi = DirichletCharacter(H, H._module([1])) N = Newforms(chi, 8, names="a")
 
Level: \( N \) \(=\) \( 50 = 2 \cdot 5^{2} \)
Weight: \( k \) \(=\) \( 8 \)
Character orbit: \([\chi]\) \(=\) 50.b (of order \(2\), degree \(1\), not minimal)

Newform invariants

Copy content comment:select newform
 
Copy content sage:traces = [2,0,0,-128,0,448] f = next(g for g in N if [g.coefficient(i+1).trace() for i in range(6)] == traces)
 
Copy content gp:f = lf[1] \\ Warning: the index may be different
 
Self dual: no
Analytic conductor: \(15.6192512742\)
Analytic rank: \(0\)
Dimension: \(2\)
Coefficient field: \(\Q(\sqrt{-1}) \)
Copy content comment:defining polynomial
 
Copy content gp:f.mod \\ as an extension of the character field
 
Defining polynomial: \( x^{2} + 1 \) Copy content Toggle raw display
Coefficient ring: \(\Z[a_1, \ldots, a_{13}]\)
Coefficient ring index: \( 2 \)
Twist minimal: no (minimal twist has level 10)
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 \(\beta = 2i\). We also show the integral \(q\)-expansion of the trace form.

\(f(q)\) \(=\) \( q - 4 \beta q^{2} + 14 \beta q^{3} - 64 q^{4} + 224 q^{6} - 52 \beta q^{7} + 256 \beta q^{8} + 1403 q^{9} - 5148 q^{11} - 896 \beta q^{12} - 4301 \beta q^{13} - 832 q^{14} + 4096 q^{16} - 10137 \beta q^{17} + \cdots - 7222644 q^{99} +O(q^{100}) \) Copy content Toggle raw display
\(\operatorname{Tr}(f)(q)\) \(=\) \( 2 q - 128 q^{4} + 448 q^{6} + 2806 q^{9} - 10296 q^{11} - 1664 q^{14} + 8192 q^{16} - 91000 q^{19} + 5824 q^{21} - 28672 q^{24} - 137632 q^{26} - 463020 q^{29} - 160256 q^{31} - 324384 q^{34} - 179584 q^{36}+ \cdots - 14445288 q^{99}+O(q^{100}) \) Copy content Toggle raw display

Character values

We give the values of \(\chi\) on generators for \(\left(\mathbb{Z}/50\mathbb{Z}\right)^\times\).

\(n\) \(27\)
\(\chi(n)\) \(-1\)

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   \(\iota_m(\nu)\) \( a_{2} \) \( a_{3} \) \( a_{4} \) \( a_{5} \) \( a_{6} \) \( a_{7} \) \( a_{8} \) \( a_{9} \) \( a_{10} \)
49.1
1.00000i
1.00000i
8.00000i 28.0000i −64.0000 0 224.000 104.000i 512.000i 1403.00 0
49.2 8.00000i 28.0000i −64.0000 0 224.000 104.000i 512.000i 1403.00 0
\(n\): e.g. 2-40 or 80-90
Significant digits:
Format:

Inner twists

Char Parity Ord Mult Type
1.a even 1 1 trivial
5.b even 2 1 inner

Twists

       By twisting character orbit
Char Parity Ord Mult Type Twist Min Dim
1.a even 1 1 trivial 50.8.b.d 2
3.b odd 2 1 450.8.c.p 2
4.b odd 2 1 400.8.c.i 2
5.b even 2 1 inner 50.8.b.d 2
5.c odd 4 1 10.8.a.a 1
5.c odd 4 1 50.8.a.b 1
15.d odd 2 1 450.8.c.p 2
15.e even 4 1 90.8.a.a 1
15.e even 4 1 450.8.a.t 1
20.d odd 2 1 400.8.c.i 2
20.e even 4 1 80.8.a.a 1
20.e even 4 1 400.8.a.m 1
35.f even 4 1 490.8.a.b 1
40.i odd 4 1 320.8.a.c 1
40.k even 4 1 320.8.a.f 1
    
        By twisted newform orbit
Twist Min Dim Char Parity Ord Mult Type
10.8.a.a 1 5.c odd 4 1
50.8.a.b 1 5.c odd 4 1
50.8.b.d 2 1.a even 1 1 trivial
50.8.b.d 2 5.b even 2 1 inner
80.8.a.a 1 20.e even 4 1
90.8.a.a 1 15.e even 4 1
320.8.a.c 1 40.i odd 4 1
320.8.a.f 1 40.k even 4 1
400.8.a.m 1 20.e even 4 1
400.8.c.i 2 4.b odd 2 1
400.8.c.i 2 20.d odd 2 1
450.8.a.t 1 15.e even 4 1
450.8.c.p 2 3.b odd 2 1
450.8.c.p 2 15.d odd 2 1
490.8.a.b 1 35.f even 4 1

Hecke kernels

This newform subspace can be constructed as the kernel of the linear operator \( T_{3}^{2} + 784 \) acting on \(S_{8}^{\mathrm{new}}(50, [\chi])\). Copy content Toggle raw display

Hecke characteristic polynomials

$p$ $F_p(T)$
$2$ \( T^{2} + 64 \) Copy content Toggle raw display
$3$ \( T^{2} + 784 \) Copy content Toggle raw display
$5$ \( T^{2} \) Copy content Toggle raw display
$7$ \( T^{2} + 10816 \) Copy content Toggle raw display
$11$ \( (T + 5148)^{2} \) Copy content Toggle raw display
$13$ \( T^{2} + 73994404 \) Copy content Toggle raw display
$17$ \( T^{2} + 411035076 \) Copy content Toggle raw display
$19$ \( (T + 45500)^{2} \) Copy content Toggle raw display
$23$ \( T^{2} + 5194373184 \) Copy content Toggle raw display
$29$ \( (T + 231510)^{2} \) Copy content Toggle raw display
$31$ \( (T + 80128)^{2} \) Copy content Toggle raw display
$37$ \( T^{2} + 10952459716 \) Copy content Toggle raw display
$41$ \( (T - 584922)^{2} \) Copy content Toggle raw display
$43$ \( T^{2} + 632871163024 \) Copy content Toggle raw display
$47$ \( T^{2} + 181189840896 \) Copy content Toggle raw display
$53$ \( T^{2} + 2252394636804 \) Copy content Toggle raw display
$59$ \( (T + 246420)^{2} \) Copy content Toggle raw display
$61$ \( (T - 893942)^{2} \) Copy content Toggle raw display
$67$ \( T^{2} + 5460802490896 \) Copy content Toggle raw display
$71$ \( (T + 203688)^{2} \) Copy content Toggle raw display
$73$ \( T^{2} + 14483367712804 \) Copy content Toggle raw display
$79$ \( (T + 5053040)^{2} \) Copy content Toggle raw display
$83$ \( T^{2} + 2069522064 \) Copy content Toggle raw display
$89$ \( (T + 980010)^{2} \) Copy content Toggle raw display
$97$ \( T^{2} + 27537788541316 \) Copy content Toggle raw display
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