Properties

Label 1968.2.j.f
Level $1968$
Weight $2$
Character orbit 1968.j
Analytic conductor $15.715$
Analytic rank $0$
Dimension $8$
CM no
Inner twists $2$

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Show commands: Magma / PariGP / SageMath

Newspace parameters

comment: Compute space of new eigenforms
 
[N,k,chi] = [1968,2,Mod(1393,1968)]
 
mf = mfinit([N,k,chi],0)
 
lf = mfeigenbasis(mf)
 
from sage.modular.dirichlet import DirichletCharacter
 
H = DirichletGroup(1968, 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("1968.1393");
 
S:= CuspForms(chi, 2);
 
N := Newforms(S);
 
Level: \( N \) \(=\) \( 1968 = 2^{4} \cdot 3 \cdot 41 \)
Weight: \( k \) \(=\) \( 2 \)
Character orbit: \([\chi]\) \(=\) 1968.j (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: \(15.7145591178\)
Analytic rank: \(0\)
Dimension: \(8\)
Coefficient field: \(\mathbb{Q}[x]/(x^{8} + \cdots)\)
comment: defining polynomial
 
gp: f.mod \\ as an extension of the character field
 
Defining polynomial: \( x^{8} + 15x^{6} + 67x^{4} + 77x^{2} + 4 \) Copy content Toggle raw display
Coefficient ring: \(\Z[a_1, \ldots, a_{5}]\)
Coefficient ring index: \( 2 \)
Twist minimal: no (minimal twist has level 984)
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.

\(f(q)\) \(=\) \( q - \beta_{3} q^{3} + (\beta_{4} + 1) q^{5} + (\beta_{7} + \beta_1) q^{7} - q^{9}+O(q^{10}) \) Copy content Toggle raw display \( q - \beta_{3} q^{3} + (\beta_{4} + 1) q^{5} + (\beta_{7} + \beta_1) q^{7} - q^{9} + (\beta_{5} - \beta_{3}) q^{11} + (\beta_{5} + 2 \beta_{3}) q^{13} + ( - \beta_{3} + \beta_1) q^{15} + ( - \beta_{7} - \beta_{5}) q^{17} + (\beta_{5} + 2 \beta_{3} + 2 \beta_1) q^{19} + ( - \beta_{4} + \beta_{2}) q^{21} + (\beta_{6} - \beta_{2} + 3) q^{23} + (2 \beta_{4} - \beta_{2}) q^{25} + \beta_{3} q^{27} + ( - \beta_{5} - 3 \beta_{3} + 2 \beta_1) q^{29} + (\beta_{6} - \beta_{4} - 2 \beta_{2}) q^{31} + (\beta_{6} - 1) q^{33} + (2 \beta_{7} - \beta_{5} + \cdots + 3 \beta_1) q^{35}+ \cdots + ( - \beta_{5} + \beta_{3}) q^{99}+O(q^{100}) \) Copy content Toggle raw display
\(\operatorname{Tr}(f)(q)\) \(=\) \( 8 q + 10 q^{5} - 8 q^{9}+O(q^{10}) \) Copy content Toggle raw display \( 8 q + 10 q^{5} - 8 q^{9} + 20 q^{23} + 2 q^{25} - 8 q^{31} - 10 q^{33} - 14 q^{37} + 14 q^{39} + 12 q^{41} - 6 q^{43} - 10 q^{45} - 32 q^{49} + 10 q^{57} - 6 q^{59} - 22 q^{61} + 64 q^{73} + 12 q^{77} + 8 q^{81} - 22 q^{83} - 26 q^{87} + 12 q^{91}+O(q^{100}) \) Copy content Toggle raw display

Basis of coefficient ring in terms of a root \(\nu\) of \( x^{8} + 15x^{6} + 67x^{4} + 77x^{2} + 4 \) : Copy content Toggle raw display

\(\beta_{1}\)\(=\) \( \nu \) Copy content Toggle raw display
\(\beta_{2}\)\(=\) \( \nu^{2} + 4 \) Copy content Toggle raw display
\(\beta_{3}\)\(=\) \( ( \nu^{5} + 8\nu^{3} + 9\nu ) / 2 \) Copy content Toggle raw display
\(\beta_{4}\)\(=\) \( ( \nu^{6} + 8\nu^{4} + 9\nu^{2} ) / 2 \) Copy content Toggle raw display
\(\beta_{5}\)\(=\) \( ( \nu^{5} + 10\nu^{3} + 21\nu ) / 2 \) Copy content Toggle raw display
\(\beta_{6}\)\(=\) \( ( \nu^{6} + 10\nu^{4} + 23\nu^{2} + 6 ) / 2 \) Copy content Toggle raw display
\(\beta_{7}\)\(=\) \( ( \nu^{7} + 12\nu^{5} + 41\nu^{3} + 36\nu ) / 2 \) Copy content Toggle raw display
\(\nu\)\(=\) \( \beta_1 \) Copy content Toggle raw display
\(\nu^{2}\)\(=\) \( \beta_{2} - 4 \) Copy content Toggle raw display
\(\nu^{3}\)\(=\) \( \beta_{5} - \beta_{3} - 6\beta_1 \) Copy content Toggle raw display
\(\nu^{4}\)\(=\) \( \beta_{6} - \beta_{4} - 7\beta_{2} + 25 \) Copy content Toggle raw display
\(\nu^{5}\)\(=\) \( -8\beta_{5} + 10\beta_{3} + 39\beta_1 \) Copy content Toggle raw display
\(\nu^{6}\)\(=\) \( -8\beta_{6} + 10\beta_{4} + 47\beta_{2} - 164 \) Copy content Toggle raw display
\(\nu^{7}\)\(=\) \( 2\beta_{7} + 55\beta_{5} - 79\beta_{3} - 258\beta_1 \) Copy content Toggle raw display

Character values

We give the values of \(\chi\) on generators for \(\left(\mathbb{Z}/1968\mathbb{Z}\right)^\times\).

\(n\) \(1231\) \(1313\) \(1441\) \(1477\)
\(\chi(n)\) \(1\) \(1\) \(-1\) \(1\)

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   \(\iota_m(\nu)\) \( a_{2} \) \( a_{3} \) \( a_{4} \) \( a_{5} \) \( a_{6} \) \( a_{7} \) \( a_{8} \) \( a_{9} \) \( a_{10} \)
1393.1
2.60520i
0.233455i
1.29051i
2.54814i
2.60520i
0.233455i
1.29051i
2.54814i
0 1.00000i 0 −1.60520 0 0.181860i 0 −1.00000 0
1393.2 0 1.00000i 0 0.766545 0 4.17895i 0 −1.00000 0
1393.3 0 1.00000i 0 2.29051 0 1.04406i 0 −1.00000 0
1393.4 0 1.00000i 0 3.54814 0 5.04115i 0 −1.00000 0
1393.5 0 1.00000i 0 −1.60520 0 0.181860i 0 −1.00000 0
1393.6 0 1.00000i 0 0.766545 0 4.17895i 0 −1.00000 0
1393.7 0 1.00000i 0 2.29051 0 1.04406i 0 −1.00000 0
1393.8 0 1.00000i 0 3.54814 0 5.04115i 0 −1.00000 0
\(n\): e.g. 2-40 or 990-1000
Embeddings: e.g. 1-3 or 1393.8
Significant digits:
Format:

Inner twists

Char Parity Ord Mult Type
1.a even 1 1 trivial
41.b even 2 1 inner

Twists

       By twisting character orbit
Char Parity Ord Mult Type Twist Min Dim
1.a even 1 1 trivial 1968.2.j.f 8
4.b odd 2 1 984.2.j.b 8
12.b even 2 1 2952.2.j.d 8
41.b even 2 1 inner 1968.2.j.f 8
164.d odd 2 1 984.2.j.b 8
492.d even 2 1 2952.2.j.d 8
    
        By twisted newform orbit
Twist Min Dim Char Parity Ord Mult Type
984.2.j.b 8 4.b odd 2 1
984.2.j.b 8 164.d odd 2 1
1968.2.j.f 8 1.a even 1 1 trivial
1968.2.j.f 8 41.b even 2 1 inner
2952.2.j.d 8 12.b even 2 1
2952.2.j.d 8 492.d even 2 1

Hecke kernels

This newform subspace can be constructed as the kernel of the linear operator \( T_{5}^{4} - 5T_{5}^{3} + 2T_{5}^{2} + 14T_{5} - 10 \) acting on \(S_{2}^{\mathrm{new}}(1968, [\chi])\). Copy content Toggle raw display

Hecke characteristic polynomials

$p$ $F_p(T)$
$2$ \( T^{8} \) Copy content Toggle raw display
$3$ \( (T^{2} + 1)^{4} \) Copy content Toggle raw display
$5$ \( (T^{4} - 5 T^{3} + 2 T^{2} + \cdots - 10)^{2} \) Copy content Toggle raw display
$7$ \( T^{8} + 44 T^{6} + \cdots + 16 \) Copy content Toggle raw display
$11$ \( T^{8} + 39 T^{6} + \cdots + 400 \) Copy content Toggle raw display
$13$ \( T^{8} + 45 T^{6} + \cdots + 2116 \) Copy content Toggle raw display
$17$ \( T^{8} + 60 T^{6} + \cdots + 169 \) Copy content Toggle raw display
$19$ \( T^{8} + 89 T^{6} + \cdots + 16900 \) Copy content Toggle raw display
$23$ \( (T^{4} - 10 T^{3} + \cdots - 208)^{2} \) Copy content Toggle raw display
$29$ \( T^{8} + 143 T^{6} + \cdots + 26896 \) Copy content Toggle raw display
$31$ \( (T^{4} + 4 T^{3} + \cdots + 1861)^{2} \) Copy content Toggle raw display
$37$ \( (T^{4} + 7 T^{3} + \cdots - 278)^{2} \) Copy content Toggle raw display
$41$ \( T^{8} - 12 T^{7} + \cdots + 2825761 \) Copy content Toggle raw display
$43$ \( (T^{4} + 3 T^{3} + \cdots + 6418)^{2} \) Copy content Toggle raw display
$47$ \( T^{8} + 275 T^{6} + \cdots + 732736 \) Copy content Toggle raw display
$53$ \( T^{8} + 52 T^{6} + \cdots + 64 \) Copy content Toggle raw display
$59$ \( (T^{4} + 3 T^{3} + \cdots - 784)^{2} \) Copy content Toggle raw display
$61$ \( (T^{4} + 11 T^{3} + \cdots - 2276)^{2} \) Copy content Toggle raw display
$67$ \( T^{8} + 437 T^{6} + \cdots + 47004736 \) Copy content Toggle raw display
$71$ \( T^{8} + 84 T^{6} + \cdots + 3025 \) Copy content Toggle raw display
$73$ \( (T^{4} - 32 T^{3} + \cdots - 4019)^{2} \) Copy content Toggle raw display
$79$ \( T^{8} + 380 T^{6} + \cdots + 19784704 \) Copy content Toggle raw display
$83$ \( (T^{4} + 11 T^{3} + \cdots + 634)^{2} \) Copy content Toggle raw display
$89$ \( T^{8} + 197 T^{6} + \cdots + 222784 \) Copy content Toggle raw display
$97$ \( T^{8} + 104 T^{6} + \cdots + 16 \) Copy content Toggle raw display
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