Properties

Label 1815.2.c.g
Level $1815$
Weight $2$
Character orbit 1815.c
Analytic conductor $14.493$
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] = [1815,2,Mod(364,1815)] 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("1815.364"); S:= CuspForms(chi, 2); N := Newforms(S);
 
Copy content sage:from sage.modular.dirichlet import DirichletCharacter H = DirichletGroup(1815, base_ring=CyclotomicField(2)) chi = DirichletCharacter(H, H._module([0, 1, 0])) N = Newforms(chi, 2, names="a")
 
Level: \( N \) \(=\) \( 1815 = 3 \cdot 5 \cdot 11^{2} \)
Weight: \( k \) \(=\) \( 2 \)
Character orbit: \([\chi]\) \(=\) 1815.c (of order \(2\), degree \(1\), minimal)

Newform invariants

Copy content comment:select newform
 
Copy content sage:traces = [8,0,0,0,-8,0] 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: \(14.4928479669\)
Analytic rank: \(0\)
Dimension: \(8\)
Coefficient field: \(\Q(\zeta_{24})\)
Copy content comment:defining polynomial
 
Copy content gp:f.mod \\ as an extension of the character field
 
Defining polynomial: \( x^{8} - x^{4} + 1 \) Copy content Toggle raw display
Coefficient ring: \(\Z[a_1, \ldots, a_{7}]\)
Coefficient ring index: \( 2^{4} \)
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.

\(f(q)\) \(=\) \( q + (\beta_{5} - \beta_1) q^{2} + \beta_{3} q^{3} + (\beta_{7} - \beta_{3} - 1) q^{5} + (\beta_{5} + \beta_1) q^{6} + \beta_{4} q^{7} + (2 \beta_{5} - 2 \beta_1) q^{8} - q^{9} + (\beta_{6} - 2 \beta_{5} + \beta_{4}) q^{10}+ \cdots + (4 \beta_{5} - 4 \beta_1) q^{98}+O(q^{100}) \) Copy content Toggle raw display
\(\operatorname{Tr}(f)(q)\) \(=\) \( 8 q - 8 q^{5} - 8 q^{9} + 8 q^{15} - 32 q^{16} - 32 q^{26} - 24 q^{31} - 16 q^{34} + 8 q^{45} + 32 q^{49} - 64 q^{64} - 16 q^{69} - 24 q^{70} - 48 q^{71} + 8 q^{75} + 32 q^{80} + 8 q^{81} + 64 q^{86} + 48 q^{89}+ \cdots - 48 q^{91}+O(q^{100}) \) Copy content Toggle raw display

Basis of coefficient ring

\(\beta_{1}\)\(=\) \( \zeta_{24}^{3} \) Copy content Toggle raw display
\(\beta_{2}\)\(=\) \( \zeta_{24}^{5} + \zeta_{24} \) Copy content Toggle raw display
\(\beta_{3}\)\(=\) \( \zeta_{24}^{6} \) Copy content Toggle raw display
\(\beta_{4}\)\(=\) \( 2\zeta_{24}^{4} - 1 \) Copy content Toggle raw display
\(\beta_{5}\)\(=\) \( -\zeta_{24}^{5} + \zeta_{24} \) Copy content Toggle raw display
\(\beta_{6}\)\(=\) \( -\zeta_{24}^{6} + 2\zeta_{24}^{2} \) Copy content Toggle raw display
\(\beta_{7}\)\(=\) \( 2\zeta_{24}^{7} - \zeta_{24}^{3} \) Copy content Toggle raw display
\(\zeta_{24}\)\(=\) \( ( \beta_{5} + \beta_{2} ) / 2 \) Copy content Toggle raw display
\(\zeta_{24}^{2}\)\(=\) \( ( \beta_{6} + \beta_{3} ) / 2 \) Copy content Toggle raw display
\(\zeta_{24}^{3}\)\(=\) \( \beta_1 \) Copy content Toggle raw display
\(\zeta_{24}^{4}\)\(=\) \( ( \beta_{4} + 1 ) / 2 \) Copy content Toggle raw display
\(\zeta_{24}^{5}\)\(=\) \( ( -\beta_{5} + \beta_{2} ) / 2 \) Copy content Toggle raw display
\(\zeta_{24}^{6}\)\(=\) \( \beta_{3} \) Copy content Toggle raw display
\(\zeta_{24}^{7}\)\(=\) \( ( \beta_{7} + \beta_1 ) / 2 \) Copy content Toggle raw display

Character values

We give the values of \(\chi\) on generators for \(\left(\mathbb{Z}/1815\mathbb{Z}\right)^\times\).

\(n\) \(727\) \(1211\) \(1696\)
\(\chi(n)\) \(-1\) \(1\) \(1\)

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   \(\iota_m(\nu)\) \( a_{2} \) \( a_{3} \) \( a_{4} \) \( a_{5} \) \( a_{6} \) \( a_{7} \) \( a_{8} \) \( a_{9} \) \( a_{10} \)
364.1
0.258819 0.965926i
−0.965926 + 0.258819i
0.965926 + 0.258819i
−0.258819 0.965926i
0.965926 0.258819i
−0.258819 + 0.965926i
0.258819 + 0.965926i
−0.965926 0.258819i
1.41421i 1.00000i 0 −2.22474 0.224745i −1.41421 1.73205i 2.82843i −1.00000 −0.317837 + 3.14626i
364.2 1.41421i 1.00000i 0 0.224745 + 2.22474i −1.41421 1.73205i 2.82843i −1.00000 3.14626 0.317837i
364.3 1.41421i 1.00000i 0 −2.22474 + 0.224745i 1.41421 1.73205i 2.82843i −1.00000 0.317837 + 3.14626i
364.4 1.41421i 1.00000i 0 0.224745 2.22474i 1.41421 1.73205i 2.82843i −1.00000 −3.14626 0.317837i
364.5 1.41421i 1.00000i 0 −2.22474 0.224745i 1.41421 1.73205i 2.82843i −1.00000 0.317837 3.14626i
364.6 1.41421i 1.00000i 0 0.224745 + 2.22474i 1.41421 1.73205i 2.82843i −1.00000 −3.14626 + 0.317837i
364.7 1.41421i 1.00000i 0 −2.22474 + 0.224745i −1.41421 1.73205i 2.82843i −1.00000 −0.317837 3.14626i
364.8 1.41421i 1.00000i 0 0.224745 2.22474i −1.41421 1.73205i 2.82843i −1.00000 3.14626 + 0.317837i
\(n\): e.g. 2-40 or 80-90
Embeddings: e.g. 1-3 or 364.8
Significant digits:
Format:

Inner twists

Char Parity Ord Mult Type
1.a even 1 1 trivial
5.b even 2 1 inner
11.b odd 2 1 inner
55.d odd 2 1 inner

Twists

       By twisting character orbit
Char Parity Ord Mult Type Twist Min Dim
1.a even 1 1 trivial 1815.2.c.g 8
5.b even 2 1 inner 1815.2.c.g 8
5.c odd 4 1 9075.2.a.cr 4
5.c odd 4 1 9075.2.a.cy 4
11.b odd 2 1 inner 1815.2.c.g 8
55.d odd 2 1 inner 1815.2.c.g 8
55.e even 4 1 9075.2.a.cr 4
55.e even 4 1 9075.2.a.cy 4
    
        By twisted newform orbit
Twist Min Dim Char Parity Ord Mult Type
1815.2.c.g 8 1.a even 1 1 trivial
1815.2.c.g 8 5.b even 2 1 inner
1815.2.c.g 8 11.b odd 2 1 inner
1815.2.c.g 8 55.d odd 2 1 inner
9075.2.a.cr 4 5.c odd 4 1
9075.2.a.cr 4 55.e even 4 1
9075.2.a.cy 4 5.c odd 4 1
9075.2.a.cy 4 55.e even 4 1

Hecke kernels

This newform subspace can be constructed as the intersection of the kernels of the following linear operators acting on \(S_{2}^{\mathrm{new}}(1815, [\chi])\):

\( T_{2}^{2} + 2 \) Copy content Toggle raw display
\( T_{19}^{2} - 3 \) Copy content Toggle raw display

Hecke characteristic polynomials

$p$ $F_p(T)$
$2$ \( (T^{2} + 2)^{4} \) Copy content Toggle raw display
$3$ \( (T^{2} + 1)^{4} \) Copy content Toggle raw display
$5$ \( (T^{4} + 4 T^{3} + 8 T^{2} + \cdots + 25)^{2} \) Copy content Toggle raw display
$7$ \( (T^{2} + 3)^{4} \) Copy content Toggle raw display
$11$ \( T^{8} \) Copy content Toggle raw display
$13$ \( (T^{4} + 40 T^{2} + 16)^{2} \) Copy content Toggle raw display
$17$ \( (T^{4} + 28 T^{2} + 100)^{2} \) Copy content Toggle raw display
$19$ \( (T^{2} - 3)^{4} \) Copy content Toggle raw display
$23$ \( (T^{2} + 4)^{4} \) Copy content Toggle raw display
$29$ \( (T^{4} - 100 T^{2} + 2116)^{2} \) Copy content Toggle raw display
$31$ \( (T^{2} + 6 T - 15)^{4} \) Copy content Toggle raw display
$37$ \( (T^{4} + 50 T^{2} + 529)^{2} \) Copy content Toggle raw display
$41$ \( (T^{4} - 88 T^{2} + 400)^{2} \) Copy content Toggle raw display
$43$ \( (T^{2} + 32)^{4} \) Copy content Toggle raw display
$47$ \( (T^{2} + 54)^{4} \) Copy content Toggle raw display
$53$ \( (T^{2} + 100)^{4} \) Copy content Toggle raw display
$59$ \( (T^{2} - 150)^{4} \) Copy content Toggle raw display
$61$ \( (T^{4} - 198 T^{2} + 2025)^{2} \) Copy content Toggle raw display
$67$ \( (T^{4} + 210 T^{2} + 3249)^{2} \) Copy content Toggle raw display
$71$ \( (T^{2} + 12 T + 30)^{4} \) Copy content Toggle raw display
$73$ \( (T^{4} + 198 T^{2} + 2025)^{2} \) Copy content Toggle raw display
$79$ \( (T^{4} - 150 T^{2} + 4761)^{2} \) Copy content Toggle raw display
$83$ \( (T^{2} + 162)^{4} \) Copy content Toggle raw display
$89$ \( (T^{2} - 12 T - 18)^{4} \) Copy content Toggle raw display
$97$ \( (T^{2} + 25)^{4} \) Copy content Toggle raw display
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