Properties

Label 1728.2.c.g
Level $1728$
Weight $2$
Character orbit 1728.c
Analytic conductor $13.798$
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] = [1728,2,Mod(1727,1728)]
 
mf = mfinit([N,k,chi],0)
 
lf = mfeigenbasis(mf)
 
from sage.modular.dirichlet import DirichletCharacter
 
H = DirichletGroup(1728, base_ring=CyclotomicField(2))
 
chi = DirichletCharacter(H, H._module([1, 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("1728.1727");
 
S:= CuspForms(chi, 2);
 
N := Newforms(S);
 
Level: \( N \) \(=\) \( 1728 = 2^{6} \cdot 3^{3} \)
Weight: \( k \) \(=\) \( 2 \)
Character orbit: \([\chi]\) \(=\) 1728.c (of order \(2\), degree \(1\), not 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: \(13.7981494693\)
Analytic rank: \(0\)
Dimension: \(8\)
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: \(\Z[a_1, \ldots, a_{11}]\)
Coefficient ring index: \( 2^{10} \)
Twist minimal: no (minimal twist has level 864)
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.

\(f(q)\) \(=\) \( q - \beta_{3} q^{5} - \beta_{7} q^{7}+O(q^{10}) \) Copy content Toggle raw display \( q - \beta_{3} q^{5} - \beta_{7} q^{7} + (\beta_{5} + \beta_1) q^{11} + (\beta_{6} + 2) q^{13} + ( - \beta_{4} - \beta_{3}) q^{17} + (2 \beta_{7} - \beta_{2}) q^{19} + \beta_{5} q^{23} - \beta_{6} q^{25} + ( - 3 \beta_{4} + \beta_{3}) q^{29} + ( - \beta_{7} + 3 \beta_{2}) q^{31} + ( - 2 \beta_{5} - 3 \beta_1) q^{35} + \beta_{6} q^{37} + ( - 3 \beta_{4} - \beta_{3}) q^{41} + (2 \beta_{7} - 2 \beta_{2}) q^{43} + ( - 2 \beta_{5} + 2 \beta_1) q^{47} - \beta_{6} q^{49} + ( - \beta_{4} - 4 \beta_{3}) q^{53} + ( - 3 \beta_{7} - 2 \beta_{2}) q^{55} + ( - 2 \beta_{5} + 2 \beta_1) q^{59} - 4 q^{61} + (\beta_{4} - 7 \beta_{3}) q^{65} + (2 \beta_{7} + 4 \beta_{2}) q^{67} + ( - \beta_{5} - 6 \beta_1) q^{71} + ( - \beta_{6} - 3) q^{73} - 5 \beta_{3} q^{77} - \beta_{2} q^{79} + (5 \beta_{5} - \beta_1) q^{83} + ( - \beta_{6} - 6) q^{85} + ( - 4 \beta_{4} + 2 \beta_{3}) q^{89} + ( - 4 \beta_{7} - 5 \beta_{2}) q^{91} + (3 \beta_{5} + 4 \beta_1) q^{95} - 5 q^{97}+O(q^{100}) \) Copy content Toggle raw display
\(\operatorname{Tr}(f)(q)\) \(=\) \( 8 q+O(q^{10}) \) Copy content Toggle raw display \( 8 q + 16 q^{13} - 32 q^{61} - 24 q^{73} - 48 q^{85} - 40 q^{97}+O(q^{100}) \) Copy content Toggle raw display

Basis of coefficient ring

\(\beta_{1}\)\(=\) \( -\zeta_{24}^{6} + 2\zeta_{24}^{2} \) Copy content Toggle raw display
\(\beta_{2}\)\(=\) \( 2\zeta_{24}^{6} \) Copy content Toggle raw display
\(\beta_{3}\)\(=\) \( \zeta_{24}^{5} + 2\zeta_{24}^{4} + \zeta_{24}^{3} - \zeta_{24} - 1 \) Copy content Toggle raw display
\(\beta_{4}\)\(=\) \( -\zeta_{24}^{5} + 2\zeta_{24}^{4} - \zeta_{24}^{3} + \zeta_{24} - 1 \) Copy content Toggle raw display
\(\beta_{5}\)\(=\) \( -2\zeta_{24}^{5} + 2\zeta_{24}^{3} + 2\zeta_{24} \) Copy content Toggle raw display
\(\beta_{6}\)\(=\) \( -4\zeta_{24}^{7} + 2\zeta_{24}^{5} + 2\zeta_{24}^{3} + 2\zeta_{24} \) Copy content Toggle raw display
\(\beta_{7}\)\(=\) \( 2\zeta_{24}^{7} + \zeta_{24}^{6} + \zeta_{24}^{5} - \zeta_{24}^{3} + \zeta_{24} \) Copy content Toggle raw display
\(\zeta_{24}\)\(=\) \( ( 2\beta_{7} + \beta_{6} + \beta_{5} + \beta_{4} - \beta_{3} - \beta_{2} ) / 8 \) Copy content Toggle raw display
\(\zeta_{24}^{2}\)\(=\) \( ( \beta_{2} + 2\beta_1 ) / 4 \) Copy content Toggle raw display
\(\zeta_{24}^{3}\)\(=\) \( ( \beta_{5} - \beta_{4} + \beta_{3} ) / 4 \) Copy content Toggle raw display
\(\zeta_{24}^{4}\)\(=\) \( ( \beta_{4} + \beta_{3} + 2 ) / 4 \) Copy content Toggle raw display
\(\zeta_{24}^{5}\)\(=\) \( ( 2\beta_{7} + \beta_{6} - \beta_{5} - \beta_{4} + \beta_{3} - \beta_{2} ) / 8 \) Copy content Toggle raw display
\(\zeta_{24}^{6}\)\(=\) \( ( \beta_{2} ) / 2 \) Copy content Toggle raw display
\(\zeta_{24}^{7}\)\(=\) \( ( 2\beta_{7} - \beta_{6} + \beta_{5} - \beta_{4} + \beta_{3} - \beta_{2} ) / 8 \) Copy content Toggle raw display

Character values

We give the values of \(\chi\) on generators for \(\left(\mathbb{Z}/1728\mathbb{Z}\right)^\times\).

\(n\) \(325\) \(703\) \(1217\)
\(\chi(n)\) \(1\) \(-1\) \(-1\)

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.

comment: embeddings in the coefficient field
 
gp: mfembed(f)
 
Label   \(\iota_m(\nu)\) \( a_{2} \) \( a_{3} \) \( a_{4} \) \( a_{5} \) \( a_{6} \) \( a_{7} \) \( a_{8} \) \( a_{9} \) \( a_{10} \)
1727.1
0.965926 + 0.258819i
0.258819 0.965926i
−0.258819 + 0.965926i
−0.965926 0.258819i
−0.965926 + 0.258819i
−0.258819 0.965926i
0.258819 + 0.965926i
0.965926 0.258819i
0 0 0 3.14626i 0 3.44949i 0 0 0
1727.2 0 0 0 3.14626i 0 3.44949i 0 0 0
1727.3 0 0 0 0.317837i 0 1.44949i 0 0 0
1727.4 0 0 0 0.317837i 0 1.44949i 0 0 0
1727.5 0 0 0 0.317837i 0 1.44949i 0 0 0
1727.6 0 0 0 0.317837i 0 1.44949i 0 0 0
1727.7 0 0 0 3.14626i 0 3.44949i 0 0 0
1727.8 0 0 0 3.14626i 0 3.44949i 0 0 0
\(n\): e.g. 2-40 or 990-1000
Embeddings: e.g. 1-3 or 1727.8
Significant digits:
Format:

Inner twists

Char Parity Ord Mult Type
1.a even 1 1 trivial
3.b odd 2 1 inner
4.b odd 2 1 inner
12.b even 2 1 inner

Twists

       By twisting character orbit
Char Parity Ord Mult Type Twist Min Dim
1.a even 1 1 trivial 1728.2.c.g 8
3.b odd 2 1 inner 1728.2.c.g 8
4.b odd 2 1 inner 1728.2.c.g 8
8.b even 2 1 864.2.c.a 8
8.d odd 2 1 864.2.c.a 8
12.b even 2 1 inner 1728.2.c.g 8
24.f even 2 1 864.2.c.a 8
24.h odd 2 1 864.2.c.a 8
72.j odd 6 1 2592.2.s.a 8
72.j odd 6 1 2592.2.s.h 8
72.l even 6 1 2592.2.s.a 8
72.l even 6 1 2592.2.s.h 8
72.n even 6 1 2592.2.s.a 8
72.n even 6 1 2592.2.s.h 8
72.p odd 6 1 2592.2.s.a 8
72.p odd 6 1 2592.2.s.h 8
    
        By twisted newform orbit
Twist Min Dim Char Parity Ord Mult Type
864.2.c.a 8 8.b even 2 1
864.2.c.a 8 8.d odd 2 1
864.2.c.a 8 24.f even 2 1
864.2.c.a 8 24.h odd 2 1
1728.2.c.g 8 1.a even 1 1 trivial
1728.2.c.g 8 3.b odd 2 1 inner
1728.2.c.g 8 4.b odd 2 1 inner
1728.2.c.g 8 12.b even 2 1 inner
2592.2.s.a 8 72.j odd 6 1
2592.2.s.a 8 72.l even 6 1
2592.2.s.a 8 72.n even 6 1
2592.2.s.a 8 72.p odd 6 1
2592.2.s.h 8 72.j odd 6 1
2592.2.s.h 8 72.l even 6 1
2592.2.s.h 8 72.n even 6 1
2592.2.s.h 8 72.p odd 6 1

Hecke kernels

This newform subspace can be constructed as the intersection of the kernels of the following linear operators acting on \(S_{2}^{\mathrm{new}}(1728, [\chi])\):

\( T_{5}^{4} + 10T_{5}^{2} + 1 \) Copy content Toggle raw display
\( T_{7}^{4} + 14T_{7}^{2} + 25 \) 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
$5$ \( (T^{4} + 10 T^{2} + 1)^{2} \) Copy content Toggle raw display
$7$ \( (T^{4} + 14 T^{2} + 25)^{2} \) Copy content Toggle raw display
$11$ \( (T^{4} - 22 T^{2} + 25)^{2} \) Copy content Toggle raw display
$13$ \( (T^{2} - 4 T - 20)^{4} \) Copy content Toggle raw display
$17$ \( (T^{2} + 12)^{4} \) Copy content Toggle raw display
$19$ \( (T^{2} + 24)^{4} \) Copy content Toggle raw display
$23$ \( (T^{2} - 8)^{4} \) Copy content Toggle raw display
$29$ \( (T^{4} + 88 T^{2} + 400)^{2} \) Copy content Toggle raw display
$31$ \( (T^{4} + 62 T^{2} + 361)^{2} \) Copy content Toggle raw display
$37$ \( (T^{2} - 24)^{4} \) Copy content Toggle raw display
$41$ \( (T^{4} + 112 T^{2} + 1600)^{2} \) Copy content Toggle raw display
$43$ \( (T^{4} + 56 T^{2} + 400)^{2} \) Copy content Toggle raw display
$47$ \( (T^{4} - 88 T^{2} + 400)^{2} \) Copy content Toggle raw display
$53$ \( (T^{4} + 186 T^{2} + 3249)^{2} \) Copy content Toggle raw display
$59$ \( (T^{4} - 88 T^{2} + 400)^{2} \) Copy content Toggle raw display
$61$ \( (T + 4)^{8} \) Copy content Toggle raw display
$67$ \( (T^{4} + 248 T^{2} + 5776)^{2} \) Copy content Toggle raw display
$71$ \( (T^{4} - 232 T^{2} + 10000)^{2} \) Copy content Toggle raw display
$73$ \( (T^{2} + 6 T - 15)^{4} \) Copy content Toggle raw display
$79$ \( (T^{2} + 4)^{4} \) Copy content Toggle raw display
$83$ \( (T^{4} - 406 T^{2} + 38809)^{2} \) Copy content Toggle raw display
$89$ \( (T^{4} + 168 T^{2} + 3600)^{2} \) Copy content Toggle raw display
$97$ \( (T + 5)^{8} \) Copy content Toggle raw display
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