Properties

Label 256.3.f.d
Level $256$
Weight $3$
Character orbit 256.f
Analytic conductor $6.975$
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] = [256,3,Mod(63,256)]
 
mf = mfinit([N,k,chi],0)
 
lf = mfeigenbasis(mf)
 
from sage.modular.dirichlet import DirichletCharacter
 
H = DirichletGroup(256, base_ring=CyclotomicField(4))
 
chi = DirichletCharacter(H, H._module([2, 1]))
 
N = Newforms(chi, 3, names="a")
 
//Please install CHIMP (https://github.com/edgarcosta/CHIMP) if you want to run this code
 
chi := DirichletCharacter("256.63");
 
S:= CuspForms(chi, 3);
 
N := Newforms(S);
 
Level: \( N \) \(=\) \( 256 = 2^{8} \)
Weight: \( k \) \(=\) \( 3 \)
Character orbit: \([\chi]\) \(=\) 256.f (of order \(4\), degree \(2\), 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: \(6.97549476762\)
Analytic rank: \(0\)
Dimension: \(8\)
Relative dimension: \(4\) over \(\Q(i)\)
Coefficient field: \(\Q(\zeta_{24})\)
comment: defining polynomial
 
gp: f.mod \\ as an extension of the character field
 
Defining polynomial: \( x^{8} - x^{4} + 1 \) Copy content Toggle raw display
Coefficient ring: \(\Z[a_1, \ldots, a_{9}]\)
Coefficient ring index: \( 2^{8} \)
Twist minimal: yes
Sato-Tate group: $\mathrm{SU}(2)[C_{4}]$

$q$-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.

\(f(q)\) \(=\) \( q + \beta_{2} q^{3} + ( - \beta_{4} + 2 \beta_1 + 2) q^{5} + ( - \beta_{5} + 3 \beta_{3} + 2 \beta_{2}) q^{7} + (\beta_{7} - \beta_{4} - 5 \beta_1) q^{9}+O(q^{10}) \) Copy content Toggle raw display \( q + \beta_{2} q^{3} + ( - \beta_{4} + 2 \beta_1 + 2) q^{5} + ( - \beta_{5} + 3 \beta_{3} + 2 \beta_{2}) q^{7} + (\beta_{7} - \beta_{4} - 5 \beta_1) q^{9} + (3 \beta_{6} - 3 \beta_{5} + \cdots - 3 \beta_{2}) q^{11}+ \cdots + (22 \beta_{6} + 22 \beta_{5} - 5 \beta_{2}) q^{99}+O(q^{100}) \) Copy content Toggle raw display
\(\operatorname{Tr}(f)(q)\) \(=\) \( 8 q + 16 q^{5}+O(q^{10}) \) Copy content Toggle raw display \( 8 q + 16 q^{5} - 64 q^{17} + 80 q^{21} - 112 q^{29} - 64 q^{33} - 32 q^{37} + 32 q^{45} + 56 q^{49} + 288 q^{61} + 336 q^{65} + 48 q^{69} - 16 q^{77} - 8 q^{81} - 464 q^{85} - 288 q^{93} - 448 q^{97}+O(q^{100}) \) Copy content Toggle raw display

Basis of coefficient ring

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

Character values

We give the values of \(\chi\) on generators for \(\left(\mathbb{Z}/256\mathbb{Z}\right)^\times\).

\(n\) \(5\) \(255\)
\(\chi(n)\) \(\beta_{1}\) \(-1\)

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   \(\iota_m(\nu)\) \( a_{2} \) \( a_{3} \) \( a_{4} \) \( a_{5} \) \( a_{6} \) \( a_{7} \) \( a_{8} \) \( a_{9} \) \( a_{10} \)
63.1
0.258819 + 0.965926i
0.965926 + 0.258819i
−0.965926 0.258819i
−0.258819 0.965926i
0.258819 0.965926i
0.965926 0.258819i
−0.965926 + 0.258819i
−0.258819 + 0.965926i
0 −1.93185 1.93185i 0 3.73205 + 3.73205i 0 −8.76268 0 1.53590i 0
63.2 0 −0.517638 0.517638i 0 0.267949 + 0.267949i 0 −5.93426 0 8.46410i 0
63.3 0 0.517638 + 0.517638i 0 0.267949 + 0.267949i 0 5.93426 0 8.46410i 0
63.4 0 1.93185 + 1.93185i 0 3.73205 + 3.73205i 0 8.76268 0 1.53590i 0
191.1 0 −1.93185 + 1.93185i 0 3.73205 3.73205i 0 −8.76268 0 1.53590i 0
191.2 0 −0.517638 + 0.517638i 0 0.267949 0.267949i 0 −5.93426 0 8.46410i 0
191.3 0 0.517638 0.517638i 0 0.267949 0.267949i 0 5.93426 0 8.46410i 0
191.4 0 1.93185 1.93185i 0 3.73205 3.73205i 0 8.76268 0 1.53590i 0
\(n\): e.g. 2-40 or 990-1000
Embeddings: e.g. 1-3 or 63.4
Significant digits:
Format:

Inner twists

Char Parity Ord Mult Type
1.a even 1 1 trivial
4.b odd 2 1 inner
16.e even 4 1 inner
16.f odd 4 1 inner

Twists

       By twisting character orbit
Char Parity Ord Mult Type Twist Min Dim
1.a even 1 1 trivial 256.3.f.d yes 8
4.b odd 2 1 inner 256.3.f.d yes 8
8.b even 2 1 256.3.f.a 8
8.d odd 2 1 256.3.f.a 8
16.e even 4 1 256.3.f.a 8
16.e even 4 1 inner 256.3.f.d yes 8
16.f odd 4 1 256.3.f.a 8
16.f odd 4 1 inner 256.3.f.d yes 8
32.g even 8 2 1024.3.c.i 8
32.g even 8 1 1024.3.d.e 4
32.g even 8 1 1024.3.d.i 4
32.h odd 8 2 1024.3.c.i 8
32.h odd 8 1 1024.3.d.e 4
32.h odd 8 1 1024.3.d.i 4
    
        By twisted newform orbit
Twist Min Dim Char Parity Ord Mult Type
256.3.f.a 8 8.b even 2 1
256.3.f.a 8 8.d odd 2 1
256.3.f.a 8 16.e even 4 1
256.3.f.a 8 16.f odd 4 1
256.3.f.d yes 8 1.a even 1 1 trivial
256.3.f.d yes 8 4.b odd 2 1 inner
256.3.f.d yes 8 16.e even 4 1 inner
256.3.f.d yes 8 16.f odd 4 1 inner
1024.3.c.i 8 32.g even 8 2
1024.3.c.i 8 32.h odd 8 2
1024.3.d.e 4 32.g even 8 1
1024.3.d.e 4 32.h odd 8 1
1024.3.d.i 4 32.g even 8 1
1024.3.d.i 4 32.h odd 8 1

Hecke kernels

This newform subspace can be constructed as the intersection of the kernels of the following linear operators acting on \(S_{3}^{\mathrm{new}}(256, [\chi])\):

\( T_{3}^{8} + 56T_{3}^{4} + 16 \) Copy content Toggle raw display
\( T_{5}^{4} - 8T_{5}^{3} + 32T_{5}^{2} - 16T_{5} + 4 \) Copy content Toggle raw display

Hecke characteristic polynomials

$p$ $F_p(T)$
$2$ \( T^{8} \) Copy content Toggle raw display
$3$ \( T^{8} + 56T^{4} + 16 \) Copy content Toggle raw display
$5$ \( (T^{4} - 8 T^{3} + 32 T^{2} + \cdots + 4)^{2} \) Copy content Toggle raw display
$7$ \( (T^{4} - 112 T^{2} + 2704)^{2} \) Copy content Toggle raw display
$11$ \( T^{8} + 33656 T^{4} + 193877776 \) Copy content Toggle raw display
$13$ \( (T^{4} + 86436)^{2} \) Copy content Toggle raw display
$17$ \( (T^{2} + 16 T - 524)^{4} \) Copy content Toggle raw display
$19$ \( T^{8} + \cdots + 65554433296 \) Copy content Toggle raw display
$23$ \( (T^{4} - 1488 T^{2} + 24336)^{2} \) Copy content Toggle raw display
$29$ \( (T^{4} + 56 T^{3} + \cdots + 58564)^{2} \) Copy content Toggle raw display
$31$ \( (T^{4} + 2496 T^{2} + 1115136)^{2} \) Copy content Toggle raw display
$37$ \( (T^{4} + 16 T^{3} + \cdots + 13924)^{2} \) Copy content Toggle raw display
$41$ \( (T^{4} + 1376 T^{2} + 30976)^{2} \) Copy content Toggle raw display
$43$ \( T^{8} + \cdots + 842290759696 \) Copy content Toggle raw display
$47$ \( (T^{2} + 2592)^{4} \) Copy content Toggle raw display
$53$ \( (T^{4} + 527076)^{2} \) Copy content Toggle raw display
$59$ \( T^{8} + \cdots + 28277252628496 \) Copy content Toggle raw display
$61$ \( (T^{4} - 144 T^{3} + \cdots + 4435236)^{2} \) Copy content Toggle raw display
$67$ \( T^{8} + \cdots + 493146635536 \) Copy content Toggle raw display
$71$ \( (T^{4} - 15568 T^{2} + 27920656)^{2} \) Copy content Toggle raw display
$73$ \( (T^{4} + 2912 T^{2} + 2050624)^{2} \) Copy content Toggle raw display
$79$ \( (T^{4} + 23296 T^{2} + 46895104)^{2} \) Copy content Toggle raw display
$83$ \( T^{8} + \cdots + 57\!\cdots\!76 \) Copy content Toggle raw display
$89$ \( (T^{4} + 37472 T^{2} + 315701824)^{2} \) Copy content Toggle raw display
$97$ \( (T^{2} + 112 T + 2164)^{4} \) Copy content Toggle raw display
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