Properties

Label 920.2.x.b
Level $920$
Weight $2$
Character orbit 920.x
Analytic conductor $7.346$
Analytic rank $0$
Dimension $8$
CM discriminant -184
Inner twists $8$

Related objects

Downloads

Learn more

Show commands: Magma / PariGP / SageMath

Newspace parameters

comment: Compute space of new eigenforms
 
[N,k,chi] = [920,2,Mod(413,920)]
 
mf = mfinit([N,k,chi],0)
 
lf = mfeigenbasis(mf)
 
from sage.modular.dirichlet import DirichletCharacter
 
H = DirichletGroup(920, base_ring=CyclotomicField(4))
 
chi = DirichletCharacter(H, H._module([0, 2, 3, 2]))
 
N = Newforms(chi, 2, names="a")
 
//Please install CHIMP (https://github.com/edgarcosta/CHIMP) if you want to run this code
 
chi := DirichletCharacter("920.413");
 
S:= CuspForms(chi, 2);
 
N := Newforms(S);
 
Level: \( N \) \(=\) \( 920 = 2^{3} \cdot 5 \cdot 23 \)
Weight: \( k \) \(=\) \( 2 \)
Character orbit: \([\chi]\) \(=\) 920.x (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: \(7.34623698596\)
Analytic rank: \(0\)
Dimension: \(8\)
Relative dimension: \(4\) over \(\Q(i)\)
Coefficient field: 8.0.4694952902656.4
comment: defining polynomial
 
gp: f.mod \\ as an extension of the character field
 
Defining polynomial: \( x^{8} - 4x^{6} + 8x^{4} - 100x^{2} + 625 \) Copy content Toggle raw display
Coefficient ring: \(\Z[a_1, \ldots, a_{11}]\)
Coefficient ring index: \( 5 \)
Twist minimal: yes
Sato-Tate group: $\mathrm{U}(1)[D_{4}]$

$q$-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.

\(f(q)\) \(=\) \( q + ( - \beta_{3} + 1) q^{2} - 2 \beta_{3} q^{4} - \beta_{4} q^{5} + ( - 2 \beta_{3} - 2) q^{8} + 3 \beta_{3} q^{9}+O(q^{10}) \) Copy content Toggle raw display \( q + ( - \beta_{3} + 1) q^{2} - 2 \beta_{3} q^{4} - \beta_{4} q^{5} + ( - 2 \beta_{3} - 2) q^{8} + 3 \beta_{3} q^{9} + ( - \beta_{4} + \beta_1) q^{10} + (\beta_{5} - \beta_{4} + \beta_1) q^{11} - 4 q^{16} + (3 \beta_{3} + 3) q^{18} + ( - \beta_{5} - 3 \beta_{4} + \beta_1) q^{19} + 2 \beta_1 q^{20} + (\beta_{7} + \beta_{5} + 2 \beta_1) q^{22} - \beta_{6} q^{23} + ( - \beta_{3} - \beta_{2} - 1) q^{25} + (\beta_{6} + \beta_{2} + 4) q^{31} + (4 \beta_{3} - 4) q^{32} + 6 q^{36} + (\beta_{5} + 2 \beta_{4} + 2 \beta_1) q^{37} + ( - \beta_{7} - \beta_{5} + \cdots + 4 \beta_1) q^{38}+ \cdots + ( - 3 \beta_{7} - 3 \beta_{4} - 3 \beta_1) q^{99}+O(q^{100}) \) Copy content Toggle raw display
\(\operatorname{Tr}(f)(q)\) \(=\) \( 8 q + 8 q^{2} - 16 q^{8}+O(q^{10}) \) Copy content Toggle raw display \( 8 q + 8 q^{2} - 16 q^{8} - 32 q^{16} + 24 q^{18} - 8 q^{25} + 32 q^{31} - 32 q^{32} + 48 q^{36} - 48 q^{41} - 8 q^{47} - 16 q^{50} + 56 q^{55} + 32 q^{62} + 48 q^{72} - 72 q^{81} - 48 q^{82} - 104 q^{95} - 56 q^{98}+O(q^{100}) \) Copy content Toggle raw display

Basis of coefficient ring in terms of a root \(\nu\) of \( x^{8} - 4x^{6} + 8x^{4} - 100x^{2} + 625 \) : Copy content Toggle raw display

\(\beta_{1}\)\(=\) \( \nu \) Copy content Toggle raw display
\(\beta_{2}\)\(=\) \( ( 2\nu^{6} + 17\nu^{4} + 491\nu^{2} - 625 ) / 525 \) Copy content Toggle raw display
\(\beta_{3}\)\(=\) \( ( -2\nu^{6} - 17\nu^{4} + 34\nu^{2} + 100 ) / 525 \) Copy content Toggle raw display
\(\beta_{4}\)\(=\) \( ( 2\nu^{7} + 17\nu^{5} - 34\nu^{3} - 100\nu ) / 525 \) Copy content Toggle raw display
\(\beta_{5}\)\(=\) \( ( -23\nu^{7} + 67\nu^{5} + 916\nu^{3} + 100\nu ) / 2625 \) Copy content Toggle raw display
\(\beta_{6}\)\(=\) \( ( -23\nu^{6} + 67\nu^{4} - 134\nu^{2} + 1675 ) / 525 \) Copy content Toggle raw display
\(\beta_{7}\)\(=\) \( ( 46\nu^{7} - 134\nu^{5} + 793\nu^{3} - 2825\nu ) / 2625 \) Copy content Toggle raw display
\(\nu\)\(=\) \( \beta_1 \) Copy content Toggle raw display
\(\nu^{2}\)\(=\) \( \beta_{3} + \beta_{2} + 1 \) Copy content Toggle raw display
\(\nu^{3}\)\(=\) \( \beta_{7} + 2\beta_{5} + \beta_1 \) Copy content Toggle raw display
\(\nu^{4}\)\(=\) \( 2\beta_{6} - 21\beta_{3} + 2\beta_{2} \) Copy content Toggle raw display
\(\nu^{5}\)\(=\) \( -2\beta_{7} + 6\beta_{5} + 23\beta_{4} + 2\beta_1 \) Copy content Toggle raw display
\(\nu^{6}\)\(=\) \( -17\beta_{6} - 67\beta_{3} + 67 \) Copy content Toggle raw display
\(\nu^{7}\)\(=\) \( 34\beta_{7} - 17\beta_{5} + 67\beta_{4} + 50\beta_1 \) Copy content Toggle raw display

Character values

We give the values of \(\chi\) on generators for \(\left(\mathbb{Z}/920\mathbb{Z}\right)^\times\).

\(n\) \(231\) \(281\) \(461\) \(737\)
\(\chi(n)\) \(1\) \(-1\) \(-1\) \(-\beta_{3}\)

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   \(\iota_m(\nu)\) \( a_{2} \) \( a_{3} \) \( a_{4} \) \( a_{5} \) \( a_{6} \) \( a_{7} \) \( a_{8} \) \( a_{9} \) \( a_{10} \)
413.1
1.14211 + 1.92239i
−2.16693 + 0.551740i
2.16693 0.551740i
−1.14211 1.92239i
1.14211 1.92239i
−2.16693 0.551740i
2.16693 + 0.551740i
−1.14211 + 1.92239i
1.00000 1.00000i 0 2.00000i −1.92239 + 1.14211i 0 0 −2.00000 2.00000i 3.00000i −0.780279 + 3.06450i
413.2 1.00000 1.00000i 0 2.00000i −0.551740 2.16693i 0 0 −2.00000 2.00000i 3.00000i −2.71867 1.61519i
413.3 1.00000 1.00000i 0 2.00000i 0.551740 + 2.16693i 0 0 −2.00000 2.00000i 3.00000i 2.71867 + 1.61519i
413.4 1.00000 1.00000i 0 2.00000i 1.92239 1.14211i 0 0 −2.00000 2.00000i 3.00000i 0.780279 3.06450i
597.1 1.00000 + 1.00000i 0 2.00000i −1.92239 1.14211i 0 0 −2.00000 + 2.00000i 3.00000i −0.780279 3.06450i
597.2 1.00000 + 1.00000i 0 2.00000i −0.551740 + 2.16693i 0 0 −2.00000 + 2.00000i 3.00000i −2.71867 + 1.61519i
597.3 1.00000 + 1.00000i 0 2.00000i 0.551740 2.16693i 0 0 −2.00000 + 2.00000i 3.00000i 2.71867 1.61519i
597.4 1.00000 + 1.00000i 0 2.00000i 1.92239 + 1.14211i 0 0 −2.00000 + 2.00000i 3.00000i 0.780279 + 3.06450i
\(n\): e.g. 2-40 or 990-1000
Embeddings: e.g. 1-3 or 413.4
Significant digits:
Format:

Inner twists

Char Parity Ord Mult Type
1.a even 1 1 trivial
184.e odd 2 1 CM by \(\Q(\sqrt{-46}) \)
5.c odd 4 1 inner
8.b even 2 1 inner
23.b odd 2 1 inner
40.i odd 4 1 inner
115.e even 4 1 inner
920.x even 4 1 inner

Twists

       By twisting character orbit
Char Parity Ord Mult Type Twist Min Dim
1.a even 1 1 trivial 920.2.x.b 8
5.c odd 4 1 inner 920.2.x.b 8
8.b even 2 1 inner 920.2.x.b 8
23.b odd 2 1 inner 920.2.x.b 8
40.i odd 4 1 inner 920.2.x.b 8
115.e even 4 1 inner 920.2.x.b 8
184.e odd 2 1 CM 920.2.x.b 8
920.x even 4 1 inner 920.2.x.b 8
    
        By twisted newform orbit
Twist Min Dim Char Parity Ord Mult Type
920.2.x.b 8 1.a even 1 1 trivial
920.2.x.b 8 5.c odd 4 1 inner
920.2.x.b 8 8.b even 2 1 inner
920.2.x.b 8 23.b odd 2 1 inner
920.2.x.b 8 40.i odd 4 1 inner
920.2.x.b 8 115.e even 4 1 inner
920.2.x.b 8 184.e odd 2 1 CM
920.2.x.b 8 920.x even 4 1 inner

Hecke kernels

This newform subspace can be constructed as the intersection of the kernels of the following linear operators acting on \(S_{2}^{\mathrm{new}}(920, [\chi])\):

\( T_{3} \) Copy content Toggle raw display
\( T_{11}^{4} - 72T_{11}^{2} + 1250 \) Copy content Toggle raw display

Hecke characteristic polynomials

$p$ $F_p(T)$
$2$ \( (T^{2} - 2 T + 2)^{4} \) Copy content Toggle raw display
$3$ \( T^{8} \) Copy content Toggle raw display
$5$ \( T^{8} + 4 T^{6} + \cdots + 625 \) Copy content Toggle raw display
$7$ \( T^{8} \) Copy content Toggle raw display
$11$ \( (T^{4} - 72 T^{2} + 1250)^{2} \) Copy content Toggle raw display
$13$ \( T^{8} \) Copy content Toggle raw display
$17$ \( T^{8} \) Copy content Toggle raw display
$19$ \( (T^{4} + 128 T^{2} + 4050)^{2} \) Copy content Toggle raw display
$23$ \( (T^{4} + 529)^{2} \) Copy content Toggle raw display
$29$ \( T^{8} \) Copy content Toggle raw display
$31$ \( (T^{2} - 8 T - 30)^{4} \) Copy content Toggle raw display
$37$ \( T^{8} + 9916 T^{4} + 202500 \) Copy content Toggle raw display
$41$ \( (T^{2} + 12 T - 10)^{4} \) Copy content Toggle raw display
$43$ \( T^{8} + 9116 T^{4} + 2500 \) Copy content Toggle raw display
$47$ \( (T^{4} + 4 T^{3} + \cdots + 8100)^{2} \) Copy content Toggle raw display
$53$ \( T^{8} + 9116 T^{4} + 2500 \) Copy content Toggle raw display
$59$ \( T^{8} \) Copy content Toggle raw display
$61$ \( (T^{4} - 72 T^{2} + 1250)^{2} \) Copy content Toggle raw display
$67$ \( T^{8} + 9916 T^{4} + 202500 \) Copy content Toggle raw display
$71$ \( (T^{2} - 184)^{4} \) Copy content Toggle raw display
$73$ \( (T^{4} + 8464)^{2} \) Copy content Toggle raw display
$79$ \( T^{8} \) Copy content Toggle raw display
$83$ \( T^{8} + 97276 T^{4} + 486202500 \) Copy content Toggle raw display
$89$ \( T^{8} \) Copy content Toggle raw display
$97$ \( T^{8} \) Copy content Toggle raw display
show more
show less