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Newspace parameters

Copy content comment:Compute space of new eigenforms
 
Copy content gp:[N,k,chi] = [450,8,Mod(107,450)] 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("450.107"); S:= CuspForms(chi, 8); N := Newforms(S);
 
Copy content sage:from sage.modular.dirichlet import DirichletCharacter H = DirichletGroup(450, base_ring=CyclotomicField(4)) chi = DirichletCharacter(H, H._module([2, 1])) N = Newforms(chi, 8, names="a")
 
Level: \( N \) \(=\) \( 450 = 2 \cdot 3^{2} \cdot 5^{2} \)
Weight: \( k \) \(=\) \( 8 \)
Character orbit: \([\chi]\) \(=\) 450.f (of order \(4\), degree \(2\), minimal)

Newform invariants

Copy content comment:select newform
 
Copy content sage:traces = [4,0,0,0,0,0,4264] f = next(g for g in N if [g.coefficient(i+1).trace() for i in range(7)] == traces)
 
Copy content gp:f = lf[1] \\ Warning: the index may be different
 
Self dual: no
Analytic conductor: \(140.573261468\)
Analytic rank: \(0\)
Dimension: \(4\)
Relative dimension: \(2\) over \(\Q(i)\)
Coefficient field: \(\Q(\zeta_{8})\)
Copy content comment:defining polynomial
 
Copy content gp:f.mod \\ as an extension of the character field
 
Defining polynomial: \( x^{4} + 1 \) Copy content Toggle raw display
Coefficient ring: \(\Z[a_1, \ldots, a_{29}]\)
Coefficient ring index: \( 2 \)
Twist minimal: no (minimal twist has level 90)
Sato-Tate group: $\mathrm{SU}(2)[C_{4}]$

$q$-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 \(1,\beta_1,\beta_2,\beta_3\) for the coefficient ring described below. We also show the integral \(q\)-expansion of the trace form.

\(f(q)\) \(=\) \( q + (4 \beta_{3} + 4 \beta_{2}) q^{2} + 64 \beta_1 q^{4} + ( - 1066 \beta_1 + 1066) q^{7} + ( - 256 \beta_{3} + 256 \beta_{2}) q^{8} + 1138 \beta_{2} q^{11} + (3399 \beta_1 + 3399) q^{13} + 8528 \beta_{3} q^{14}+ \cdots + (5796676 \beta_{3} - 5796676 \beta_{2}) q^{98}+O(q^{100}) \) Copy content Toggle raw display
\(\operatorname{Tr}(f)(q)\) \(=\) \( 4 q + 4264 q^{7} + 13596 q^{13} - 16384 q^{16} - 36416 q^{22} + 272896 q^{28} - 841424 q^{31} - 1252356 q^{37} + 1446720 q^{43} + 186496 q^{46} - 870144 q^{52} + 5287328 q^{58} + 10737600 q^{61} + 11545072 q^{67}+ \cdots - 4484916 q^{97}+O(q^{100}) \) Copy content Toggle raw display

Basis of coefficient ring

\(\beta_{1}\)\(=\) \( \zeta_{8}^{2} \) Copy content Toggle raw display
\(\beta_{2}\)\(=\) \( \zeta_{8}^{3} + \zeta_{8} \) Copy content Toggle raw display
\(\beta_{3}\)\(=\) \( -\zeta_{8}^{3} + \zeta_{8} \) Copy content Toggle raw display
\(\zeta_{8}\)\(=\) \( ( \beta_{3} + \beta_{2} ) / 2 \) Copy content Toggle raw display
\(\zeta_{8}^{2}\)\(=\) \( \beta_1 \) Copy content Toggle raw display
\(\zeta_{8}^{3}\)\(=\) \( ( -\beta_{3} + \beta_{2} ) / 2 \) Copy content Toggle raw display

Character values

We give the values of \(\chi\) on generators for \(\left(\mathbb{Z}/450\mathbb{Z}\right)^\times\).

\(n\) \(101\) \(127\)
\(\chi(n)\) \(-1\) \(-\beta_{1}\)

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
−0.707107 + 0.707107i
0.707107 0.707107i
−0.707107 0.707107i
0.707107 + 0.707107i
−5.65685 + 5.65685i 0 64.0000i 0 0 1066.00 + 1066.00i 362.039 + 362.039i 0 0
107.2 5.65685 5.65685i 0 64.0000i 0 0 1066.00 + 1066.00i −362.039 362.039i 0 0
143.1 −5.65685 5.65685i 0 64.0000i 0 0 1066.00 1066.00i 362.039 362.039i 0 0
143.2 5.65685 + 5.65685i 0 64.0000i 0 0 1066.00 1066.00i −362.039 + 362.039i 0 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
3.b odd 2 1 inner
5.c odd 4 1 inner
15.e even 4 1 inner

Twists

       By twisting character orbit
Char Parity Ord Mult Type Twist Min Dim
1.a even 1 1 trivial 450.8.f.b 4
3.b odd 2 1 inner 450.8.f.b 4
5.b even 2 1 90.8.f.a 4
5.c odd 4 1 90.8.f.a 4
5.c odd 4 1 inner 450.8.f.b 4
15.d odd 2 1 90.8.f.a 4
15.e even 4 1 90.8.f.a 4
15.e even 4 1 inner 450.8.f.b 4
    
        By twisted newform orbit
Twist Min Dim Char Parity Ord Mult Type
90.8.f.a 4 5.b even 2 1
90.8.f.a 4 5.c odd 4 1
90.8.f.a 4 15.d odd 2 1
90.8.f.a 4 15.e even 4 1
450.8.f.b 4 1.a even 1 1 trivial
450.8.f.b 4 3.b odd 2 1 inner
450.8.f.b 4 5.c odd 4 1 inner
450.8.f.b 4 15.e even 4 1 inner

Hecke kernels

This newform subspace can be constructed as the kernel of the linear operator \( T_{7}^{2} - 2132T_{7} + 2272712 \) acting on \(S_{8}^{\mathrm{new}}(450, [\chi])\). Copy content Toggle raw display

Hecke characteristic polynomials

$p$ $F_p(T)$
$2$ \( T^{4} + 4096 \) Copy content Toggle raw display
$3$ \( T^{4} \) Copy content Toggle raw display
$5$ \( T^{4} \) Copy content Toggle raw display
$7$ \( (T^{2} - 2132 T + 2272712)^{2} \) Copy content Toggle raw display
$11$ \( (T^{2} + 2590088)^{2} \) Copy content Toggle raw display
$13$ \( (T^{2} - 6798 T + 23106402)^{2} \) Copy content Toggle raw display
$17$ \( T^{4} + 11166183629056 \) Copy content Toggle raw display
$19$ \( (T^{2} + 50580544)^{2} \) Copy content Toggle raw display
$23$ \( T^{4} + 11\!\cdots\!56 \) Copy content Toggle raw display
$29$ \( (T^{2} - 54601244882)^{2} \) Copy content Toggle raw display
$31$ \( (T + 210356)^{4} \) Copy content Toggle raw display
$37$ \( (T^{2} + 626178 T + 196049443842)^{2} \) Copy content Toggle raw display
$41$ \( (T^{2} + 189768658178)^{2} \) Copy content Toggle raw display
$43$ \( (T^{2} - 723360 T + 261624844800)^{2} \) Copy content Toggle raw display
$47$ \( T^{4} + 24\!\cdots\!00 \) Copy content Toggle raw display
$53$ \( T^{4} + 87\!\cdots\!36 \) Copy content Toggle raw display
$59$ \( (T^{2} - 5335220183048)^{2} \) Copy content Toggle raw display
$61$ \( (T - 2684400)^{4} \) Copy content Toggle raw display
$67$ \( (T^{2} + \cdots + 16661085935648)^{2} \) Copy content Toggle raw display
$71$ \( (T^{2} + 14752920898592)^{2} \) Copy content Toggle raw display
$73$ \( (T^{2} + \cdots + 22596312361058)^{2} \) Copy content Toggle raw display
$79$ \( (T^{2} + 815647409424)^{2} \) Copy content Toggle raw display
$83$ \( T^{4} + 17\!\cdots\!56 \) Copy content Toggle raw display
$89$ \( (T^{2} - 4137626651138)^{2} \) Copy content Toggle raw display
$97$ \( (T^{2} + \cdots + 2514308940882)^{2} \) Copy content Toggle raw display
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