Properties

Label 2646.2.a.bm
Level $2646$
Weight $2$
Character orbit 2646.a
Self dual yes
Analytic conductor $21.128$
Analytic rank $1$
Dimension $2$
CM no
Inner twists $1$

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Show commands: Magma / PariGP / SageMath

Newspace parameters

comment: Compute space of new eigenforms
 
[N,k,chi] = [2646,2,Mod(1,2646)]
 
mf = mfinit([N,k,chi],0)
 
lf = mfeigenbasis(mf)
 
from sage.modular.dirichlet import DirichletCharacter
 
H = DirichletGroup(2646, base_ring=CyclotomicField(2))
 
chi = DirichletCharacter(H, H._module([0, 0]))
 
N = Newforms(chi, 2, names="a")
 
//Please install CHIMP (https://github.com/edgarcosta/CHIMP) if you want to run this code
 
chi := DirichletCharacter("2646.1");
 
S:= CuspForms(chi, 2);
 
N := Newforms(S);
 
Level: \( N \) \(=\) \( 2646 = 2 \cdot 3^{3} \cdot 7^{2} \)
Weight: \( k \) \(=\) \( 2 \)
Character orbit: \([\chi]\) \(=\) 2646.a (trivial)

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: yes
Analytic conductor: \(21.1284163748\)
Analytic rank: \(1\)
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: \(\Z[a_1, \ldots, a_{5}]\)
Coefficient ring index: \( 1 \)
Twist minimal: yes
Fricke sign: \(1\)
Sato-Tate group: $\mathrm{SU}(2)$

$q$-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.

\(f(q)\) \(=\) \( q + q^{2} + q^{4} + \beta q^{5} + q^{8}+O(q^{10}) \) Copy content Toggle raw display \( q + q^{2} + q^{4} + \beta q^{5} + q^{8} + \beta q^{10} + ( - 3 \beta - 2) q^{11} - 3 q^{13} + q^{16} + (\beta - 3) q^{17} + ( - \beta - 6) q^{19} + \beta q^{20} + ( - 3 \beta - 2) q^{22} - q^{23} - 3 q^{25} - 3 q^{26} + (3 \beta - 1) q^{29} + ( - 3 \beta - 3) q^{31} + q^{32} + (\beta - 3) q^{34} + (6 \beta - 2) q^{37} + ( - \beta - 6) q^{38} + \beta q^{40} - 2 \beta q^{41} + ( - 3 \beta - 1) q^{43} + ( - 3 \beta - 2) q^{44} - q^{46} - 5 \beta q^{47} - 3 q^{50} - 3 q^{52} + ( - 3 \beta + 7) q^{53} + ( - 2 \beta - 6) q^{55} + (3 \beta - 1) q^{58} + ( - 2 \beta - 3) q^{59} + (4 \beta - 6) q^{61} + ( - 3 \beta - 3) q^{62} + q^{64} - 3 \beta q^{65} + ( - 3 \beta + 9) q^{67} + (\beta - 3) q^{68} + (6 \beta + 3) q^{71} + 7 \beta q^{73} + (6 \beta - 2) q^{74} + ( - \beta - 6) q^{76} + (9 \beta + 2) q^{79} + \beta q^{80} - 2 \beta q^{82} + (8 \beta - 6) q^{83} + ( - 3 \beta + 2) q^{85} + ( - 3 \beta - 1) q^{86} + ( - 3 \beta - 2) q^{88} + (5 \beta + 9) q^{89} - q^{92} - 5 \beta q^{94} + ( - 6 \beta - 2) q^{95} + (2 \beta - 12) q^{97} +O(q^{100}) \) Copy content Toggle raw display
\(\operatorname{Tr}(f)(q)\) \(=\) \( 2 q + 2 q^{2} + 2 q^{4} + 2 q^{8}+O(q^{10}) \) Copy content Toggle raw display \( 2 q + 2 q^{2} + 2 q^{4} + 2 q^{8} - 4 q^{11} - 6 q^{13} + 2 q^{16} - 6 q^{17} - 12 q^{19} - 4 q^{22} - 2 q^{23} - 6 q^{25} - 6 q^{26} - 2 q^{29} - 6 q^{31} + 2 q^{32} - 6 q^{34} - 4 q^{37} - 12 q^{38} - 2 q^{43} - 4 q^{44} - 2 q^{46} - 6 q^{50} - 6 q^{52} + 14 q^{53} - 12 q^{55} - 2 q^{58} - 6 q^{59} - 12 q^{61} - 6 q^{62} + 2 q^{64} + 18 q^{67} - 6 q^{68} + 6 q^{71} - 4 q^{74} - 12 q^{76} + 4 q^{79} - 12 q^{83} + 4 q^{85} - 2 q^{86} - 4 q^{88} + 18 q^{89} - 2 q^{92} - 4 q^{95} - 24 q^{97}+O(q^{100}) \) Copy content Toggle raw display

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   \(\iota_m(\nu)\) \( a_{2} \) \( a_{3} \) \( a_{4} \) \( a_{5} \) \( a_{6} \) \( a_{7} \) \( a_{8} \) \( a_{9} \) \( a_{10} \)
1.1
−1.41421
1.41421
1.00000 0 1.00000 −1.41421 0 0 1.00000 0 −1.41421
1.2 1.00000 0 1.00000 1.41421 0 0 1.00000 0 1.41421
\(n\): e.g. 2-40 or 990-1000
Significant digits:
Format:

Atkin-Lehner signs

\( p \) Sign
\(2\) \(-1\)
\(3\) \(-1\)
\(7\) \(1\)

Inner twists

This newform does not admit any (nontrivial) inner twists.

Twists

       By twisting character orbit
Char Parity Ord Mult Type Twist Min Dim
1.a even 1 1 trivial 2646.2.a.bm yes 2
3.b odd 2 1 2646.2.a.bg 2
7.b odd 2 1 2646.2.a.bn yes 2
21.c even 2 1 2646.2.a.bh yes 2
    
        By twisted newform orbit
Twist Min Dim Char Parity Ord Mult Type
2646.2.a.bg 2 3.b odd 2 1
2646.2.a.bh yes 2 21.c even 2 1
2646.2.a.bm yes 2 1.a even 1 1 trivial
2646.2.a.bn yes 2 7.b odd 2 1

Hecke kernels

This newform subspace can be constructed as the intersection of the kernels of the following linear operators acting on \(S_{2}^{\mathrm{new}}(\Gamma_0(2646))\):

\( T_{5}^{2} - 2 \) Copy content Toggle raw display
\( T_{11}^{2} + 4T_{11} - 14 \) Copy content Toggle raw display
\( T_{13} + 3 \) Copy content Toggle raw display
\( T_{17}^{2} + 6T_{17} + 7 \) Copy content Toggle raw display

Hecke characteristic polynomials

$p$ $F_p(T)$
$2$ \( (T - 1)^{2} \) Copy content Toggle raw display
$3$ \( T^{2} \) Copy content Toggle raw display
$5$ \( T^{2} - 2 \) Copy content Toggle raw display
$7$ \( T^{2} \) Copy content Toggle raw display
$11$ \( T^{2} + 4T - 14 \) Copy content Toggle raw display
$13$ \( (T + 3)^{2} \) Copy content Toggle raw display
$17$ \( T^{2} + 6T + 7 \) Copy content Toggle raw display
$19$ \( T^{2} + 12T + 34 \) Copy content Toggle raw display
$23$ \( (T + 1)^{2} \) Copy content Toggle raw display
$29$ \( T^{2} + 2T - 17 \) Copy content Toggle raw display
$31$ \( T^{2} + 6T - 9 \) Copy content Toggle raw display
$37$ \( T^{2} + 4T - 68 \) Copy content Toggle raw display
$41$ \( T^{2} - 8 \) Copy content Toggle raw display
$43$ \( T^{2} + 2T - 17 \) Copy content Toggle raw display
$47$ \( T^{2} - 50 \) Copy content Toggle raw display
$53$ \( T^{2} - 14T + 31 \) Copy content Toggle raw display
$59$ \( T^{2} + 6T + 1 \) Copy content Toggle raw display
$61$ \( T^{2} + 12T + 4 \) Copy content Toggle raw display
$67$ \( T^{2} - 18T + 63 \) Copy content Toggle raw display
$71$ \( T^{2} - 6T - 63 \) Copy content Toggle raw display
$73$ \( T^{2} - 98 \) Copy content Toggle raw display
$79$ \( T^{2} - 4T - 158 \) Copy content Toggle raw display
$83$ \( T^{2} + 12T - 92 \) Copy content Toggle raw display
$89$ \( T^{2} - 18T + 31 \) Copy content Toggle raw display
$97$ \( T^{2} + 24T + 136 \) Copy content Toggle raw display
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