Properties

Label 7920.2.a.ch
Level $7920$
Weight $2$
Character orbit 7920.a
Self dual yes
Analytic conductor $63.242$
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] = [7920,2,Mod(1,7920)]
 
mf = mfinit([N,k,chi],0)
 
lf = mfeigenbasis(mf)
 
from sage.modular.dirichlet import DirichletCharacter
 
H = DirichletGroup(7920, base_ring=CyclotomicField(2))
 
chi = DirichletCharacter(H, H._module([0, 0, 0, 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("7920.1");
 
S:= CuspForms(chi, 2);
 
N := Newforms(S);
 
Level: \( N \) \(=\) \( 7920 = 2^{4} \cdot 3^{2} \cdot 5 \cdot 11 \)
Weight: \( k \) \(=\) \( 2 \)
Character orbit: \([\chi]\) \(=\) 7920.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: \(63.2415184009\)
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: \(\Z[a_1, \ldots, a_{13}]\)
Coefficient ring index: \( 2 \)
Twist minimal: no (minimal twist has level 55)
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 \(\beta = 2\sqrt{2}\). We also show the integral \(q\)-expansion of the trace form.

\(f(q)\) \(=\) \( q + q^{5} + 2 q^{7}+O(q^{10}) \) Copy content Toggle raw display \( q + q^{5} + 2 q^{7} + q^{11} + (\beta - 4) q^{13} + ( - \beta - 4) q^{17} - \beta q^{23} + q^{25} + (2 \beta - 2) q^{29} + 2 q^{35} + ( - 2 \beta - 2) q^{37} - 6 q^{41} + 6 q^{43} + \beta q^{47} - 3 q^{49} + ( - 2 \beta - 6) q^{53} + q^{55} + (2 \beta - 4) q^{59} + ( - 4 \beta + 2) q^{61} + (\beta - 4) q^{65} + ( - 3 \beta - 4) q^{67} + 4 \beta q^{71} + (\beta - 4) q^{73} + 2 q^{77} - 4 q^{79} - 6 q^{83} + ( - \beta - 4) q^{85} + (4 \beta + 2) q^{89} + (2 \beta - 8) q^{91} + (2 \beta - 2) q^{97} +O(q^{100}) \) Copy content Toggle raw display
\(\operatorname{Tr}(f)(q)\) \(=\) \( 2 q + 2 q^{5} + 4 q^{7}+O(q^{10}) \) Copy content Toggle raw display \( 2 q + 2 q^{5} + 4 q^{7} + 2 q^{11} - 8 q^{13} - 8 q^{17} + 2 q^{25} - 4 q^{29} + 4 q^{35} - 4 q^{37} - 12 q^{41} + 12 q^{43} - 6 q^{49} - 12 q^{53} + 2 q^{55} - 8 q^{59} + 4 q^{61} - 8 q^{65} - 8 q^{67} - 8 q^{73} + 4 q^{77} - 8 q^{79} - 12 q^{83} - 8 q^{85} + 4 q^{89} - 16 q^{91} - 4 q^{97}+O(q^{100}) \) 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
0 0 0 1.00000 0 2.00000 0 0 0
1.2 0 0 0 1.00000 0 2.00000 0 0 0
\(n\): e.g. 2-40 or 990-1000
Significant digits:
Format:

Atkin-Lehner signs

\( p \) Sign
\(2\) \(-1\)
\(3\) \(-1\)
\(5\) \(-1\)
\(11\) \(-1\)

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 7920.2.a.ch 2
3.b odd 2 1 880.2.a.m 2
4.b odd 2 1 495.2.a.b 2
12.b even 2 1 55.2.a.b 2
15.d odd 2 1 4400.2.a.bn 2
15.e even 4 2 4400.2.b.q 4
20.d odd 2 1 2475.2.a.x 2
20.e even 4 2 2475.2.c.l 4
24.f even 2 1 3520.2.a.bn 2
24.h odd 2 1 3520.2.a.bo 2
33.d even 2 1 9680.2.a.bn 2
44.c even 2 1 5445.2.a.y 2
60.h even 2 1 275.2.a.c 2
60.l odd 4 2 275.2.b.d 4
84.h odd 2 1 2695.2.a.f 2
132.d odd 2 1 605.2.a.d 2
132.n odd 10 4 605.2.g.l 8
132.o even 10 4 605.2.g.f 8
156.h even 2 1 9295.2.a.g 2
660.g odd 2 1 3025.2.a.o 2
    
        By twisted newform orbit
Twist Min Dim Char Parity Ord Mult Type
55.2.a.b 2 12.b even 2 1
275.2.a.c 2 60.h even 2 1
275.2.b.d 4 60.l odd 4 2
495.2.a.b 2 4.b odd 2 1
605.2.a.d 2 132.d odd 2 1
605.2.g.f 8 132.o even 10 4
605.2.g.l 8 132.n odd 10 4
880.2.a.m 2 3.b odd 2 1
2475.2.a.x 2 20.d odd 2 1
2475.2.c.l 4 20.e even 4 2
2695.2.a.f 2 84.h odd 2 1
3025.2.a.o 2 660.g odd 2 1
3520.2.a.bn 2 24.f even 2 1
3520.2.a.bo 2 24.h odd 2 1
4400.2.a.bn 2 15.d odd 2 1
4400.2.b.q 4 15.e even 4 2
5445.2.a.y 2 44.c even 2 1
7920.2.a.ch 2 1.a even 1 1 trivial
9295.2.a.g 2 156.h even 2 1
9680.2.a.bn 2 33.d even 2 1

Hecke kernels

This newform subspace can be constructed as the intersection of the kernels of the following linear operators acting on \(S_{2}^{\mathrm{new}}(\Gamma_0(7920))\):

\( T_{7} - 2 \) Copy content Toggle raw display
\( T_{13}^{2} + 8T_{13} + 8 \) Copy content Toggle raw display
\( T_{17}^{2} + 8T_{17} + 8 \) Copy content Toggle raw display
\( T_{19} \) Copy content Toggle raw display
\( T_{23}^{2} - 8 \) Copy content Toggle raw display
\( T_{29}^{2} + 4T_{29} - 28 \) Copy content Toggle raw display

Hecke characteristic polynomials

$p$ $F_p(T)$
$2$ \( T^{2} \) Copy content Toggle raw display
$3$ \( T^{2} \) Copy content Toggle raw display
$5$ \( (T - 1)^{2} \) Copy content Toggle raw display
$7$ \( (T - 2)^{2} \) Copy content Toggle raw display
$11$ \( (T - 1)^{2} \) Copy content Toggle raw display
$13$ \( T^{2} + 8T + 8 \) Copy content Toggle raw display
$17$ \( T^{2} + 8T + 8 \) Copy content Toggle raw display
$19$ \( T^{2} \) Copy content Toggle raw display
$23$ \( T^{2} - 8 \) Copy content Toggle raw display
$29$ \( T^{2} + 4T - 28 \) Copy content Toggle raw display
$31$ \( T^{2} \) Copy content Toggle raw display
$37$ \( T^{2} + 4T - 28 \) Copy content Toggle raw display
$41$ \( (T + 6)^{2} \) Copy content Toggle raw display
$43$ \( (T - 6)^{2} \) Copy content Toggle raw display
$47$ \( T^{2} - 8 \) Copy content Toggle raw display
$53$ \( T^{2} + 12T + 4 \) Copy content Toggle raw display
$59$ \( T^{2} + 8T - 16 \) Copy content Toggle raw display
$61$ \( T^{2} - 4T - 124 \) Copy content Toggle raw display
$67$ \( T^{2} + 8T - 56 \) Copy content Toggle raw display
$71$ \( T^{2} - 128 \) Copy content Toggle raw display
$73$ \( T^{2} + 8T + 8 \) Copy content Toggle raw display
$79$ \( (T + 4)^{2} \) Copy content Toggle raw display
$83$ \( (T + 6)^{2} \) Copy content Toggle raw display
$89$ \( T^{2} - 4T - 124 \) Copy content Toggle raw display
$97$ \( T^{2} + 4T - 28 \) Copy content Toggle raw display
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