Properties

Label 936.2.c.e
Level $936$
Weight $2$
Character orbit 936.c
Analytic conductor $7.474$
Analytic rank $0$
Dimension $8$
CM no
Inner twists $4$

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Show commands: Magma / PariGP / SageMath

Newspace parameters

comment: Compute space of new eigenforms
 
[N,k,chi] = [936,2,Mod(649,936)]
 
mf = mfinit([N,k,chi],0)
 
lf = mfeigenbasis(mf)
 
from sage.modular.dirichlet import DirichletCharacter
 
H = DirichletGroup(936, base_ring=CyclotomicField(2))
 
chi = DirichletCharacter(H, H._module([0, 0, 0, 1]))
 
N = Newforms(chi, 2, names="a")
 
//Please install CHIMP (https://github.com/edgarcosta/CHIMP) if you want to run this code
 
chi := DirichletCharacter("936.649");
 
S:= CuspForms(chi, 2);
 
N := Newforms(S);
 
Level: \( N \) \(=\) \( 936 = 2^{3} \cdot 3^{2} \cdot 13 \)
Weight: \( k \) \(=\) \( 2 \)
Character orbit: \([\chi]\) \(=\) 936.c (of order \(2\), degree \(1\), minimal)

Newform invariants

comment: select newform
 
sage: f = N[0] # Warning: the index may be different
 
gp: f = lf[1] \\ Warning: the index may be different
 
Self dual: no
Analytic conductor: \(7.47399762919\)
Analytic rank: \(0\)
Dimension: \(8\)
Coefficient field: 8.0.40960000.1
comment: defining polynomial
 
gp: f.mod \\ as an extension of the character field
 
Defining polynomial: \( x^{8} + 7x^{4} + 1 \) Copy content Toggle raw display
Coefficient ring: \(\Z[a_1, \ldots, a_{13}]\)
Coefficient ring index: \( 2^{12} \)
Twist minimal: yes
Sato-Tate group: $\mathrm{SU}(2)[C_{2}]$

$q$-expansion

comment: q-expansion
 
sage: f.q_expansion() # note that sage often uses an isomorphic number field
 
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.

\(f(q)\) \(=\) \( q - \beta_{2} q^{5} + \beta_1 q^{7}+O(q^{10}) \) Copy content Toggle raw display \( q - \beta_{2} q^{5} + \beta_1 q^{7} + (\beta_{4} - \beta_{2}) q^{11} - \beta_{7} q^{13} - \beta_{6} q^{17} + (\beta_{7} + \beta_{5} - \beta_1) q^{19} + ( - \beta_{6} - \beta_{3}) q^{23} + (\beta_{7} - \beta_{5} - 1) q^{25} + \beta_{3} q^{29} - \beta_1 q^{31} + ( - \beta_{6} + \beta_{3}) q^{35} + ( - \beta_{7} - \beta_{5}) q^{37} + (2 \beta_{4} - 3 \beta_{2}) q^{41} + ( - 2 \beta_{7} + 2 \beta_{5}) q^{43} + (3 \beta_{4} - \beta_{2}) q^{47} + (2 \beta_{7} - 2 \beta_{5} - 5) q^{49} + ( - \beta_{6} - \beta_{3}) q^{53} - 4 q^{55} + ( - \beta_{4} - 3 \beta_{2}) q^{59} + (\beta_{7} - \beta_{5} + 4) q^{61} + ( - 2 \beta_{4} - \beta_{3} - \beta_{2}) q^{65} + (\beta_{7} + \beta_{5} + \beta_1) q^{67} + (\beta_{4} - 3 \beta_{2}) q^{71} - \beta_{6} q^{77} + ( - 2 \beta_{7} + 2 \beta_{5} + 8) q^{79} + ( - 5 \beta_{4} + \beta_{2}) q^{83} - 4 \beta_1 q^{85} + (6 \beta_{4} + \beta_{2}) q^{89} + ( - \beta_{7} + 3 \beta_{5} + \beta_1 + 4) q^{91} + (\beta_{6} + \beta_{3}) q^{95} + ( - 2 \beta_{7} - 2 \beta_{5} + 4 \beta_1) q^{97}+O(q^{100}) \) Copy content Toggle raw display
\(\operatorname{Tr}(f)(q)\) \(=\) \( 8 q+O(q^{10}) \) Copy content Toggle raw display \( 8 q - 8 q^{25} - 40 q^{49} - 32 q^{55} + 32 q^{61} + 64 q^{79} + 32 q^{91}+O(q^{100}) \) Copy content Toggle raw display

Basis of coefficient ring in terms of a root \(\nu\) of \( x^{8} + 7x^{4} + 1 \) : Copy content Toggle raw display

\(\beta_{1}\)\(=\) \( ( 2\nu^{7} + 16\nu^{3} + 6\nu ) / 3 \) Copy content Toggle raw display
\(\beta_{2}\)\(=\) \( ( -2\nu^{6} - 10\nu^{2} ) / 3 \) Copy content Toggle raw display
\(\beta_{3}\)\(=\) \( ( -4\nu^{7} - 32\nu^{3} + 12\nu ) / 3 \) Copy content Toggle raw display
\(\beta_{4}\)\(=\) \( ( 2\nu^{6} + 16\nu^{2} ) / 3 \) Copy content Toggle raw display
\(\beta_{5}\)\(=\) \( ( -4\nu^{7} - 2\nu^{5} - 2\nu^{4} - 26\nu^{3} - 10\nu - 7 ) / 3 \) Copy content Toggle raw display
\(\beta_{6}\)\(=\) \( ( -8\nu^{7} + 4\nu^{5} - 52\nu^{3} + 20\nu ) / 3 \) Copy content Toggle raw display
\(\beta_{7}\)\(=\) \( ( -4\nu^{7} - 2\nu^{5} + 2\nu^{4} - 26\nu^{3} - 10\nu + 7 ) / 3 \) Copy content Toggle raw display
\(\nu\)\(=\) \( ( \beta_{3} + 2\beta_1 ) / 8 \) Copy content Toggle raw display
\(\nu^{2}\)\(=\) \( ( \beta_{4} + \beta_{2} ) / 2 \) Copy content Toggle raw display
\(\nu^{3}\)\(=\) \( ( \beta_{7} + \beta_{6} + \beta_{5} - 2\beta_{3} + 4\beta_1 ) / 8 \) Copy content Toggle raw display
\(\nu^{4}\)\(=\) \( ( 3\beta_{7} - 3\beta_{5} - 14 ) / 4 \) Copy content Toggle raw display
\(\nu^{5}\)\(=\) \( ( -3\beta_{7} + 3\beta_{6} - 3\beta_{5} - 5\beta_{3} - 10\beta_1 ) / 8 \) Copy content Toggle raw display
\(\nu^{6}\)\(=\) \( ( -5\beta_{4} - 8\beta_{2} ) / 2 \) Copy content Toggle raw display
\(\nu^{7}\)\(=\) \( ( -8\beta_{7} - 8\beta_{6} - 8\beta_{5} + 13\beta_{3} - 26\beta_1 ) / 8 \) Copy content Toggle raw display

Character values

We give the values of \(\chi\) on generators for \(\left(\mathbb{Z}/936\mathbb{Z}\right)^\times\).

\(n\) \(145\) \(209\) \(469\) \(703\)
\(\chi(n)\) \(-1\) \(1\) \(1\) \(1\)

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.

comment: embeddings in the coefficient field
 
gp: mfembed(f)
 
Label   \(\iota_m(\nu)\) \( a_{2} \) \( a_{3} \) \( a_{4} \) \( a_{5} \) \( a_{6} \) \( a_{7} \) \( a_{8} \) \( a_{9} \) \( a_{10} \)
649.1
−1.14412 1.14412i
1.14412 + 1.14412i
0.437016 0.437016i
−0.437016 + 0.437016i
−0.437016 0.437016i
0.437016 + 0.437016i
1.14412 1.14412i
−1.14412 + 1.14412i
0 0 0 3.23607i 0 4.57649i 0 0 0
649.2 0 0 0 3.23607i 0 4.57649i 0 0 0
649.3 0 0 0 1.23607i 0 1.74806i 0 0 0
649.4 0 0 0 1.23607i 0 1.74806i 0 0 0
649.5 0 0 0 1.23607i 0 1.74806i 0 0 0
649.6 0 0 0 1.23607i 0 1.74806i 0 0 0
649.7 0 0 0 3.23607i 0 4.57649i 0 0 0
649.8 0 0 0 3.23607i 0 4.57649i 0 0 0
\(n\): e.g. 2-40 or 990-1000
Embeddings: e.g. 1-3 or 649.8
Significant digits:
Format:

Inner twists

Char Parity Ord Mult Type
1.a even 1 1 trivial
3.b odd 2 1 inner
13.b even 2 1 inner
39.d odd 2 1 inner

Twists

       By twisting character orbit
Char Parity Ord Mult Type Twist Min Dim
1.a even 1 1 trivial 936.2.c.e 8
3.b odd 2 1 inner 936.2.c.e 8
4.b odd 2 1 1872.2.c.l 8
12.b even 2 1 1872.2.c.l 8
13.b even 2 1 inner 936.2.c.e 8
39.d odd 2 1 inner 936.2.c.e 8
52.b odd 2 1 1872.2.c.l 8
156.h even 2 1 1872.2.c.l 8
    
        By twisted newform orbit
Twist Min Dim Char Parity Ord Mult Type
936.2.c.e 8 1.a even 1 1 trivial
936.2.c.e 8 3.b odd 2 1 inner
936.2.c.e 8 13.b even 2 1 inner
936.2.c.e 8 39.d odd 2 1 inner
1872.2.c.l 8 4.b odd 2 1
1872.2.c.l 8 12.b even 2 1
1872.2.c.l 8 52.b odd 2 1
1872.2.c.l 8 156.h even 2 1

Hecke kernels

This newform subspace can be constructed as the kernel of the linear operator \( T_{5}^{4} + 12T_{5}^{2} + 16 \) acting on \(S_{2}^{\mathrm{new}}(936, [\chi])\). Copy content Toggle raw display

Hecke characteristic polynomials

$p$ $F_p(T)$
$2$ \( T^{8} \) Copy content Toggle raw display
$3$ \( T^{8} \) Copy content Toggle raw display
$5$ \( (T^{4} + 12 T^{2} + 16)^{2} \) Copy content Toggle raw display
$7$ \( (T^{4} + 24 T^{2} + 64)^{2} \) Copy content Toggle raw display
$11$ \( (T^{4} + 12 T^{2} + 16)^{2} \) Copy content Toggle raw display
$13$ \( (T^{4} + 6 T^{2} + 169)^{2} \) Copy content Toggle raw display
$17$ \( (T^{2} - 32)^{4} \) Copy content Toggle raw display
$19$ \( (T^{4} + 56 T^{2} + 64)^{2} \) Copy content Toggle raw display
$23$ \( (T^{4} - 96 T^{2} + 1024)^{2} \) Copy content Toggle raw display
$29$ \( (T^{4} - 96 T^{2} + 1024)^{2} \) Copy content Toggle raw display
$31$ \( (T^{4} + 24 T^{2} + 64)^{2} \) Copy content Toggle raw display
$37$ \( (T^{2} + 32)^{4} \) Copy content Toggle raw display
$41$ \( (T^{4} + 92 T^{2} + 1936)^{2} \) Copy content Toggle raw display
$43$ \( (T^{2} - 80)^{4} \) Copy content Toggle raw display
$47$ \( (T^{4} + 60 T^{2} + 400)^{2} \) Copy content Toggle raw display
$53$ \( (T^{4} - 96 T^{2} + 1024)^{2} \) Copy content Toggle raw display
$59$ \( (T^{4} + 140 T^{2} + 400)^{2} \) Copy content Toggle raw display
$61$ \( (T^{2} - 8 T - 4)^{4} \) Copy content Toggle raw display
$67$ \( (T^{4} + 120 T^{2} + 1600)^{2} \) Copy content Toggle raw display
$71$ \( (T^{4} + 92 T^{2} + 1936)^{2} \) Copy content Toggle raw display
$73$ \( T^{8} \) Copy content Toggle raw display
$79$ \( (T^{2} - 16 T - 16)^{4} \) Copy content Toggle raw display
$83$ \( (T^{4} + 172 T^{2} + 5776)^{2} \) Copy content Toggle raw display
$89$ \( (T^{4} + 348 T^{2} + 26896)^{2} \) Copy content Toggle raw display
$97$ \( (T^{4} + 384 T^{2} + 16384)^{2} \) Copy content Toggle raw display
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