Properties

Label 960.2.bi.e
Level $960$
Weight $2$
Character orbit 960.bi
Analytic conductor $7.666$
Analytic rank $0$
Dimension $8$
CM no
Inner twists $8$

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Show commands: Magma / PariGP / SageMath

Newspace parameters

comment: Compute space of new eigenforms
 
[N,k,chi] = [960,2,Mod(353,960)]
 
mf = mfinit([N,k,chi],0)
 
lf = mfeigenbasis(mf)
 
from sage.modular.dirichlet import DirichletCharacter
 
H = DirichletGroup(960, base_ring=CyclotomicField(4))
 
chi = DirichletCharacter(H, H._module([0, 2, 2, 3]))
 
N = Newforms(chi, 2, names="a")
 
//Please install CHIMP (https://github.com/edgarcosta/CHIMP) if you want to run this code
 
chi := DirichletCharacter("960.353");
 
S:= CuspForms(chi, 2);
 
N := Newforms(S);
 
Level: \( N \) \(=\) \( 960 = 2^{6} \cdot 3 \cdot 5 \)
Weight: \( k \) \(=\) \( 2 \)
Character orbit: \([\chi]\) \(=\) 960.bi (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: \(7.66563859404\)
Analytic rank: \(0\)
Dimension: \(8\)
Relative dimension: \(4\) over \(\Q(i)\)
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: \(\Z[a_1, \ldots, a_{5}]\)
Coefficient ring index: \( 2^{4} \)
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.

\(f(q)\) \(=\) \( q + ( - \beta_{6} - \beta_{3} - 1) q^{3} - \beta_{7} q^{5} + (\beta_{5} + \beta_{4}) q^{7} + (2 \beta_{6} + \beta_{3} - 2 \beta_1) q^{9}+O(q^{10}) \) Copy content Toggle raw display \( q + ( - \beta_{6} - \beta_{3} - 1) q^{3} - \beta_{7} q^{5} + (\beta_{5} + \beta_{4}) q^{7} + (2 \beta_{6} + \beta_{3} - 2 \beta_1) q^{9} + (3 \beta_{6} - 3 \beta_1) q^{11} + ( - 2 \beta_{5} - 2 \beta_{4}) q^{13} + (\beta_{7} - \beta_{5} - \beta_{2}) q^{15} - 4 \beta_{6} q^{17} + 2 q^{19} + ( - \beta_{7} - 2 \beta_{5} + \beta_{2}) q^{21} - 2 \beta_{2} q^{23} - 5 \beta_{3} q^{25} + (\beta_{3} + 5 \beta_1 - 1) q^{27} + ( - 3 \beta_{7} - 3 \beta_{2}) q^{29} - 2 \beta_{4} q^{31} + (3 \beta_{3} + 6 \beta_1 - 3) q^{33} + ( - 5 \beta_{6} + 5 \beta_1) q^{35} + (2 \beta_{7} + 4 \beta_{5} - 2 \beta_{2}) q^{39} + (2 \beta_{6} + 2 \beta_1) q^{41} + (4 \beta_{3} + 4) q^{43} + (2 \beta_{5} - 2 \beta_{4} + \beta_{2}) q^{45} - 2 \beta_{7} q^{47} + 3 \beta_{3} q^{49} + (4 \beta_{6} - 4 \beta_{3} - 4 \beta_1) q^{51} - 4 \beta_{7} q^{53} + (3 \beta_{5} - 3 \beta_{4}) q^{55} + ( - 2 \beta_{6} - 2 \beta_{3} - 2) q^{57} + ( - 5 \beta_{6} - 5 \beta_1) q^{59} + 4 \beta_{5} q^{61} + (\beta_{5} - \beta_{4} - 4 \beta_{2}) q^{63} + (10 \beta_{6} - 10 \beta_1) q^{65} + (6 \beta_{3} - 6) q^{67} + (2 \beta_{7} - 2 \beta_{4} + 2 \beta_{2}) q^{69} + ( - 2 \beta_{7} - 2 \beta_{2}) q^{71} + (3 \beta_{3} - 3) q^{73} + (5 \beta_{3} - 5 \beta_1 - 5) q^{75} - 6 \beta_{2} q^{77} - 2 \beta_{5} q^{79} + ( - 4 \beta_{6} - 4 \beta_1 + 7) q^{81} + 8 \beta_{6} q^{83} - 4 \beta_{5} q^{85} + (6 \beta_{7} - 3 \beta_{5} - 3 \beta_{4}) q^{87} + ( - 6 \beta_{6} + 6 \beta_1) q^{89} - 20 \beta_{3} q^{91} + (2 \beta_{7} + 2 \beta_{5} + 2 \beta_{4}) q^{93} - 2 \beta_{7} q^{95} + (3 \beta_{3} + 3) q^{97} + ( - 3 \beta_{6} - 3 \beta_1 + 12) q^{99}+O(q^{100}) \) Copy content Toggle raw display
\(\operatorname{Tr}(f)(q)\) \(=\) \( 8 q - 8 q^{3}+O(q^{10}) \) Copy content Toggle raw display \( 8 q - 8 q^{3} + 16 q^{19} - 8 q^{27} - 24 q^{33} + 32 q^{43} - 16 q^{57} - 48 q^{67} - 24 q^{73} - 40 q^{75} + 56 q^{81} + 24 q^{97} + 96 q^{99}+O(q^{100}) \) 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

\(\beta_{1}\)\(=\) \( ( \nu^{5} + 5\nu ) / 3 \) Copy content Toggle raw display
\(\beta_{2}\)\(=\) \( ( \nu^{5} + 11\nu ) / 3 \) Copy content Toggle raw display
\(\beta_{3}\)\(=\) \( ( \nu^{6} + 8\nu^{2} ) / 3 \) Copy content Toggle raw display
\(\beta_{4}\)\(=\) \( ( 2\nu^{4} + 7 ) / 3 \) Copy content Toggle raw display
\(\beta_{5}\)\(=\) \( \nu^{6} + 6\nu^{2} \) Copy content Toggle raw display
\(\beta_{6}\)\(=\) \( ( 2\nu^{7} + 13\nu^{3} ) / 3 \) Copy content Toggle raw display
\(\beta_{7}\)\(=\) \( ( 4\nu^{7} + 29\nu^{3} ) / 3 \) Copy content Toggle raw display
\(\nu\)\(=\) \( ( \beta_{2} - \beta_1 ) / 2 \) Copy content Toggle raw display
\(\nu^{2}\)\(=\) \( ( -\beta_{5} + 3\beta_{3} ) / 2 \) Copy content Toggle raw display
\(\nu^{3}\)\(=\) \( \beta_{7} - 2\beta_{6} \) Copy content Toggle raw display
\(\nu^{4}\)\(=\) \( ( 3\beta_{4} - 7 ) / 2 \) Copy content Toggle raw display
\(\nu^{5}\)\(=\) \( ( -5\beta_{2} + 11\beta_1 ) / 2 \) Copy content Toggle raw display
\(\nu^{6}\)\(=\) \( 4\beta_{5} - 9\beta_{3} \) Copy content Toggle raw display
\(\nu^{7}\)\(=\) \( ( -13\beta_{7} + 29\beta_{6} ) / 2 \) Copy content Toggle raw display

Character values

We give the values of \(\chi\) on generators for \(\left(\mathbb{Z}/960\mathbb{Z}\right)^\times\).

\(n\) \(511\) \(577\) \(641\) \(901\)
\(\chi(n)\) \(1\) \(\beta_{3}\) \(-1\) \(-1\)

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   \(\iota_m(\nu)\) \( a_{2} \) \( a_{3} \) \( a_{4} \) \( a_{5} \) \( a_{6} \) \( a_{7} \) \( a_{8} \) \( a_{9} \) \( a_{10} \)
353.1
−0.437016 + 0.437016i
1.14412 1.14412i
−1.14412 + 1.14412i
0.437016 0.437016i
−0.437016 0.437016i
1.14412 + 1.14412i
−1.14412 1.14412i
0.437016 + 0.437016i
0 −1.70711 + 0.292893i 0 −1.58114 1.58114i 0 2.23607 2.23607i 0 2.82843 1.00000i 0
353.2 0 −1.70711 + 0.292893i 0 1.58114 + 1.58114i 0 −2.23607 + 2.23607i 0 2.82843 1.00000i 0
353.3 0 −0.292893 + 1.70711i 0 −1.58114 1.58114i 0 −2.23607 + 2.23607i 0 −2.82843 1.00000i 0
353.4 0 −0.292893 + 1.70711i 0 1.58114 + 1.58114i 0 2.23607 2.23607i 0 −2.82843 1.00000i 0
737.1 0 −1.70711 0.292893i 0 −1.58114 + 1.58114i 0 2.23607 + 2.23607i 0 2.82843 + 1.00000i 0
737.2 0 −1.70711 0.292893i 0 1.58114 1.58114i 0 −2.23607 2.23607i 0 2.82843 + 1.00000i 0
737.3 0 −0.292893 1.70711i 0 −1.58114 + 1.58114i 0 −2.23607 2.23607i 0 −2.82843 + 1.00000i 0
737.4 0 −0.292893 1.70711i 0 1.58114 1.58114i 0 2.23607 + 2.23607i 0 −2.82843 + 1.00000i 0
\(n\): e.g. 2-40 or 990-1000
Embeddings: e.g. 1-3 or 353.4
Significant digits:
Format:

Inner twists

Char Parity Ord Mult Type
1.a even 1 1 trivial
3.b odd 2 1 inner
8.d odd 2 1 inner
20.e even 4 1 inner
24.f even 2 1 inner
40.i odd 4 1 inner
60.l odd 4 1 inner
120.w even 4 1 inner

Twists

       By twisting character orbit
Char Parity Ord Mult Type Twist Min Dim
1.a even 1 1 trivial 960.2.bi.e 8
3.b odd 2 1 inner 960.2.bi.e 8
4.b odd 2 1 960.2.bi.f yes 8
5.c odd 4 1 960.2.bi.f yes 8
8.b even 2 1 960.2.bi.f yes 8
8.d odd 2 1 inner 960.2.bi.e 8
12.b even 2 1 960.2.bi.f yes 8
15.e even 4 1 960.2.bi.f yes 8
20.e even 4 1 inner 960.2.bi.e 8
24.f even 2 1 inner 960.2.bi.e 8
24.h odd 2 1 960.2.bi.f yes 8
40.i odd 4 1 inner 960.2.bi.e 8
40.k even 4 1 960.2.bi.f yes 8
60.l odd 4 1 inner 960.2.bi.e 8
120.q odd 4 1 960.2.bi.f yes 8
120.w even 4 1 inner 960.2.bi.e 8
    
        By twisted newform orbit
Twist Min Dim Char Parity Ord Mult Type
960.2.bi.e 8 1.a even 1 1 trivial
960.2.bi.e 8 3.b odd 2 1 inner
960.2.bi.e 8 8.d odd 2 1 inner
960.2.bi.e 8 20.e even 4 1 inner
960.2.bi.e 8 24.f even 2 1 inner
960.2.bi.e 8 40.i odd 4 1 inner
960.2.bi.e 8 60.l odd 4 1 inner
960.2.bi.e 8 120.w even 4 1 inner
960.2.bi.f yes 8 4.b odd 2 1
960.2.bi.f yes 8 5.c odd 4 1
960.2.bi.f yes 8 8.b even 2 1
960.2.bi.f yes 8 12.b even 2 1
960.2.bi.f yes 8 15.e even 4 1
960.2.bi.f yes 8 24.h odd 2 1
960.2.bi.f yes 8 40.k even 4 1
960.2.bi.f yes 8 120.q odd 4 1

Hecke kernels

This newform subspace can be constructed as the intersection of the kernels of the following linear operators acting on \(S_{2}^{\mathrm{new}}(960, [\chi])\):

\( T_{7}^{4} + 100 \) Copy content Toggle raw display
\( T_{11}^{2} - 18 \) Copy content Toggle raw display
\( T_{19} - 2 \) Copy content Toggle raw display
\( T_{23}^{4} + 400 \) Copy content Toggle raw display

Hecke characteristic polynomials

$p$ $F_p(T)$
$2$ \( T^{8} \) Copy content Toggle raw display
$3$ \( (T^{4} + 4 T^{3} + 8 T^{2} + \cdots + 9)^{2} \) Copy content Toggle raw display
$5$ \( (T^{4} + 25)^{2} \) Copy content Toggle raw display
$7$ \( (T^{4} + 100)^{2} \) Copy content Toggle raw display
$11$ \( (T^{2} - 18)^{4} \) Copy content Toggle raw display
$13$ \( (T^{4} + 1600)^{2} \) Copy content Toggle raw display
$17$ \( (T^{4} + 256)^{2} \) Copy content Toggle raw display
$19$ \( (T - 2)^{8} \) Copy content Toggle raw display
$23$ \( (T^{4} + 400)^{2} \) Copy content Toggle raw display
$29$ \( (T^{2} + 90)^{4} \) Copy content Toggle raw display
$31$ \( (T^{2} - 20)^{4} \) Copy content Toggle raw display
$37$ \( T^{8} \) Copy content Toggle raw display
$41$ \( (T^{2} + 8)^{4} \) Copy content Toggle raw display
$43$ \( (T^{2} - 8 T + 32)^{4} \) Copy content Toggle raw display
$47$ \( (T^{4} + 400)^{2} \) Copy content Toggle raw display
$53$ \( (T^{4} + 6400)^{2} \) Copy content Toggle raw display
$59$ \( (T^{2} + 50)^{4} \) Copy content Toggle raw display
$61$ \( (T^{2} + 80)^{4} \) Copy content Toggle raw display
$67$ \( (T^{2} + 12 T + 72)^{4} \) Copy content Toggle raw display
$71$ \( (T^{2} + 40)^{4} \) Copy content Toggle raw display
$73$ \( (T^{2} + 6 T + 18)^{4} \) Copy content Toggle raw display
$79$ \( (T^{2} + 20)^{4} \) Copy content Toggle raw display
$83$ \( (T^{4} + 4096)^{2} \) Copy content Toggle raw display
$89$ \( (T^{2} - 72)^{4} \) Copy content Toggle raw display
$97$ \( (T^{2} - 6 T + 18)^{4} \) Copy content Toggle raw display
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