Properties

Label 968.2.c.a
Level $968$
Weight $2$
Character orbit 968.c
Analytic conductor $7.730$
Analytic rank $0$
Dimension $2$
CM discriminant -88
Inner twists $4$

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Show commands: Magma / PariGP / SageMath

Newspace parameters

comment: Compute space of new eigenforms
 
[N,k,chi] = [968,2,Mod(485,968)]
 
mf = mfinit([N,k,chi],0)
 
lf = mfeigenbasis(mf)
 
from sage.modular.dirichlet import DirichletCharacter
 
H = DirichletGroup(968, base_ring=CyclotomicField(2))
 
chi = DirichletCharacter(H, H._module([0, 1, 0]))
 
N = Newforms(chi, 2, names="a")
 
//Please install CHIMP (https://github.com/edgarcosta/CHIMP) if you want to run this code
 
chi := DirichletCharacter("968.485");
 
S:= CuspForms(chi, 2);
 
N := Newforms(S);
 
Level: \( N \) \(=\) \( 968 = 2^{3} \cdot 11^{2} \)
Weight: \( k \) \(=\) \( 2 \)
Character orbit: \([\chi]\) \(=\) 968.c (of order \(2\), degree \(1\), 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: \(7.72951891566\)
Analytic rank: \(0\)
Dimension: \(2\)
Coefficient field: \(\Q(\sqrt{-2}) \)
comment: defining polynomial
 
gp: f.mod \\ as an extension of the character field
 
Defining polynomial: \( x^{2} + 2 \) Copy content Toggle raw display
Coefficient ring: \(\Z[a_1, a_2]\)
Coefficient ring index: \( 1 \)
Twist minimal: yes
Sato-Tate group: $\mathrm{U}(1)[D_{2}]$

$q$-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 \(\beta = \sqrt{-2}\). We also show the integral \(q\)-expansion of the trace form.

\(f(q)\) \(=\) \( q + \beta q^{2} - 2 q^{4} - 2 \beta q^{8} + 3 q^{9} +O(q^{10}) \) Copy content Toggle raw display \( q + \beta q^{2} - 2 q^{4} - 2 \beta q^{8} + 3 q^{9} + 2 \beta q^{13} + 4 q^{16} + 3 \beta q^{18} - 4 \beta q^{19} + 2 q^{23} + 5 q^{25} - 4 q^{26} + 6 \beta q^{29} + 6 q^{31} + 4 \beta q^{32} - 6 q^{36} + 8 q^{38} + 8 \beta q^{43} + 2 \beta q^{46} + 10 q^{47} - 7 q^{49} + 5 \beta q^{50} - 4 \beta q^{52} - 12 q^{58} + 10 \beta q^{61} + 6 \beta q^{62} - 8 q^{64} - 14 q^{71} - 6 \beta q^{72} + 8 \beta q^{76} + 9 q^{81} - 12 \beta q^{83} - 16 q^{86} + 2 q^{89} - 4 q^{92} + 10 \beta q^{94} + 6 q^{97} - 7 \beta q^{98} +O(q^{100}) \) Copy content Toggle raw display
\(\operatorname{Tr}(f)(q)\) \(=\) \( 2 q - 4 q^{4} + 6 q^{9}+O(q^{10}) \) Copy content Toggle raw display \( 2 q - 4 q^{4} + 6 q^{9} + 8 q^{16} + 4 q^{23} + 10 q^{25} - 8 q^{26} + 12 q^{31} - 12 q^{36} + 16 q^{38} + 20 q^{47} - 14 q^{49} - 24 q^{58} - 16 q^{64} - 28 q^{71} + 18 q^{81} - 32 q^{86} + 4 q^{89} - 8 q^{92} + 12 q^{97}+O(q^{100}) \) Copy content Toggle raw display

Character values

We give the values of \(\chi\) on generators for \(\left(\mathbb{Z}/968\mathbb{Z}\right)^\times\).

\(n\) \(485\) \(727\) \(849\)
\(\chi(n)\) \(-1\) \(1\) \(1\)

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   \(\iota_m(\nu)\) \( a_{2} \) \( a_{3} \) \( a_{4} \) \( a_{5} \) \( a_{6} \) \( a_{7} \) \( a_{8} \) \( a_{9} \) \( a_{10} \)
485.1
1.41421i
1.41421i
1.41421i 0 −2.00000 0 0 0 2.82843i 3.00000 0
485.2 1.41421i 0 −2.00000 0 0 0 2.82843i 3.00000 0
\(n\): e.g. 2-40 or 990-1000
Significant digits:
Format:

Inner twists

Char Parity Ord Mult Type
1.a even 1 1 trivial
88.b odd 2 1 CM by \(\Q(\sqrt{-22}) \)
8.b even 2 1 inner
11.b odd 2 1 inner

Twists

       By twisting character orbit
Char Parity Ord Mult Type Twist Min Dim
1.a even 1 1 trivial 968.2.c.a 2
4.b odd 2 1 3872.2.c.a 2
8.b even 2 1 inner 968.2.c.a 2
8.d odd 2 1 3872.2.c.a 2
11.b odd 2 1 inner 968.2.c.a 2
11.c even 5 4 968.2.o.a 8
11.d odd 10 4 968.2.o.a 8
44.c even 2 1 3872.2.c.a 2
88.b odd 2 1 CM 968.2.c.a 2
88.g even 2 1 3872.2.c.a 2
88.o even 10 4 968.2.o.a 8
88.p odd 10 4 968.2.o.a 8
    
        By twisted newform orbit
Twist Min Dim Char Parity Ord Mult Type
968.2.c.a 2 1.a even 1 1 trivial
968.2.c.a 2 8.b even 2 1 inner
968.2.c.a 2 11.b odd 2 1 inner
968.2.c.a 2 88.b odd 2 1 CM
968.2.o.a 8 11.c even 5 4
968.2.o.a 8 11.d odd 10 4
968.2.o.a 8 88.o even 10 4
968.2.o.a 8 88.p odd 10 4
3872.2.c.a 2 4.b odd 2 1
3872.2.c.a 2 8.d odd 2 1
3872.2.c.a 2 44.c even 2 1
3872.2.c.a 2 88.g even 2 1

Hecke kernels

This newform subspace can be constructed as the intersection of the kernels of the following linear operators acting on \(S_{2}^{\mathrm{new}}(968, [\chi])\):

\( T_{3} \) Copy content Toggle raw display
\( T_{5} \) Copy content Toggle raw display
\( T_{7} \) Copy content Toggle raw display

Hecke characteristic polynomials

$p$ $F_p(T)$
$2$ \( T^{2} + 2 \) Copy content Toggle raw display
$3$ \( T^{2} \) Copy content Toggle raw display
$5$ \( T^{2} \) Copy content Toggle raw display
$7$ \( T^{2} \) Copy content Toggle raw display
$11$ \( T^{2} \) Copy content Toggle raw display
$13$ \( T^{2} + 8 \) Copy content Toggle raw display
$17$ \( T^{2} \) Copy content Toggle raw display
$19$ \( T^{2} + 32 \) Copy content Toggle raw display
$23$ \( (T - 2)^{2} \) Copy content Toggle raw display
$29$ \( T^{2} + 72 \) Copy content Toggle raw display
$31$ \( (T - 6)^{2} \) Copy content Toggle raw display
$37$ \( T^{2} \) Copy content Toggle raw display
$41$ \( T^{2} \) Copy content Toggle raw display
$43$ \( T^{2} + 128 \) Copy content Toggle raw display
$47$ \( (T - 10)^{2} \) Copy content Toggle raw display
$53$ \( T^{2} \) Copy content Toggle raw display
$59$ \( T^{2} \) Copy content Toggle raw display
$61$ \( T^{2} + 200 \) Copy content Toggle raw display
$67$ \( T^{2} \) Copy content Toggle raw display
$71$ \( (T + 14)^{2} \) Copy content Toggle raw display
$73$ \( T^{2} \) Copy content Toggle raw display
$79$ \( T^{2} \) Copy content Toggle raw display
$83$ \( T^{2} + 288 \) Copy content Toggle raw display
$89$ \( (T - 2)^{2} \) Copy content Toggle raw display
$97$ \( (T - 6)^{2} \) Copy content Toggle raw display
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