Properties

Label 7920.2.a.ca
Level $7920$
Weight $2$
Character orbit 7920.a
Self dual yes
Analytic conductor $63.242$
Analytic rank $0$
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: \(0\)
Dimension: \(2\)
Coefficient field: \(\Q(\sqrt{17}) \)
comment: defining polynomial
 
gp: f.mod \\ as an extension of the character field
 
Defining polynomial: \( x^{2} - x - 4 \) Copy content Toggle raw display
Coefficient ring: \(\Z[a_1, \ldots, a_{7}]\)
Coefficient ring index: \( 1 \)
Twist minimal: no (minimal twist has level 440)
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 \(\beta = \frac{1}{2}(1 + \sqrt{17})\). We also show the integral \(q\)-expansion of the trace form.

\(f(q)\) \(=\) \( q + q^{5} + ( - \beta - 1) q^{7}+O(q^{10}) \) Copy content Toggle raw display \( q + q^{5} + ( - \beta - 1) q^{7} + q^{11} + ( - 2 \beta + 2) q^{13} + ( - \beta - 3) q^{17} + (\beta - 5) q^{19} + (2 \beta + 2) q^{23} + q^{25} + ( - \beta + 3) q^{29} + ( - 3 \beta - 1) q^{31} + ( - \beta - 1) q^{35} + (5 \beta - 3) q^{37} + 10 q^{41} - 2 \beta q^{43} + ( - 2 \beta - 2) q^{47} + (3 \beta - 2) q^{49} + ( - \beta + 7) q^{53} + q^{55} + ( - 6 \beta + 2) q^{59} + ( - \beta - 1) q^{61} + ( - 2 \beta + 2) q^{65} + (\beta - 5) q^{71} + ( - 2 \beta + 10) q^{73} + ( - \beta - 1) q^{77} + (2 \beta - 6) q^{79} + 10 q^{83} + ( - \beta - 3) q^{85} + ( - 5 \beta + 3) q^{89} + (2 \beta + 6) q^{91} + (\beta - 5) q^{95} + (2 \beta + 12) q^{97} +O(q^{100}) \) Copy content Toggle raw display
\(\operatorname{Tr}(f)(q)\) \(=\) \( 2 q + 2 q^{5} - 3 q^{7}+O(q^{10}) \) Copy content Toggle raw display \( 2 q + 2 q^{5} - 3 q^{7} + 2 q^{11} + 2 q^{13} - 7 q^{17} - 9 q^{19} + 6 q^{23} + 2 q^{25} + 5 q^{29} - 5 q^{31} - 3 q^{35} - q^{37} + 20 q^{41} - 2 q^{43} - 6 q^{47} - q^{49} + 13 q^{53} + 2 q^{55} - 2 q^{59} - 3 q^{61} + 2 q^{65} - 9 q^{71} + 18 q^{73} - 3 q^{77} - 10 q^{79} + 20 q^{83} - 7 q^{85} + q^{89} + 14 q^{91} - 9 q^{95} + 26 q^{97}+O(q^{100}) \) 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
2.56155
−1.56155
0 0 0 1.00000 0 −3.56155 0 0 0
1.2 0 0 0 1.00000 0 0.561553 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.ca 2
3.b odd 2 1 880.2.a.l 2
4.b odd 2 1 3960.2.a.be 2
12.b even 2 1 440.2.a.f 2
15.d odd 2 1 4400.2.a.br 2
15.e even 4 2 4400.2.b.u 4
24.f even 2 1 3520.2.a.bl 2
24.h odd 2 1 3520.2.a.bs 2
33.d even 2 1 9680.2.a.bl 2
60.h even 2 1 2200.2.a.m 2
60.l odd 4 2 2200.2.b.h 4
132.d odd 2 1 4840.2.a.n 2
    
        By twisted newform orbit
Twist Min Dim Char Parity Ord Mult Type
440.2.a.f 2 12.b even 2 1
880.2.a.l 2 3.b odd 2 1
2200.2.a.m 2 60.h even 2 1
2200.2.b.h 4 60.l odd 4 2
3520.2.a.bl 2 24.f even 2 1
3520.2.a.bs 2 24.h odd 2 1
3960.2.a.be 2 4.b odd 2 1
4400.2.a.br 2 15.d odd 2 1
4400.2.b.u 4 15.e even 4 2
4840.2.a.n 2 132.d odd 2 1
7920.2.a.ca 2 1.a even 1 1 trivial
9680.2.a.bl 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 \(S_{2}^{\mathrm{new}}(\Gamma_0(7920))\):

\( T_{7}^{2} + 3T_{7} - 2 \) Copy content Toggle raw display
\( T_{13}^{2} - 2T_{13} - 16 \) Copy content Toggle raw display
\( T_{17}^{2} + 7T_{17} + 8 \) Copy content Toggle raw display
\( T_{19}^{2} + 9T_{19} + 16 \) Copy content Toggle raw display
\( T_{23}^{2} - 6T_{23} - 8 \) Copy content Toggle raw display
\( T_{29}^{2} - 5T_{29} + 2 \) 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
$7$ \( T^{2} + 3T - 2 \) Copy content Toggle raw display
$11$ \( (T - 1)^{2} \) Copy content Toggle raw display
$13$ \( T^{2} - 2T - 16 \) Copy content Toggle raw display
$17$ \( T^{2} + 7T + 8 \) Copy content Toggle raw display
$19$ \( T^{2} + 9T + 16 \) Copy content Toggle raw display
$23$ \( T^{2} - 6T - 8 \) Copy content Toggle raw display
$29$ \( T^{2} - 5T + 2 \) Copy content Toggle raw display
$31$ \( T^{2} + 5T - 32 \) Copy content Toggle raw display
$37$ \( T^{2} + T - 106 \) Copy content Toggle raw display
$41$ \( (T - 10)^{2} \) Copy content Toggle raw display
$43$ \( T^{2} + 2T - 16 \) Copy content Toggle raw display
$47$ \( T^{2} + 6T - 8 \) Copy content Toggle raw display
$53$ \( T^{2} - 13T + 38 \) Copy content Toggle raw display
$59$ \( T^{2} + 2T - 152 \) Copy content Toggle raw display
$61$ \( T^{2} + 3T - 2 \) Copy content Toggle raw display
$67$ \( T^{2} \) Copy content Toggle raw display
$71$ \( T^{2} + 9T + 16 \) Copy content Toggle raw display
$73$ \( T^{2} - 18T + 64 \) Copy content Toggle raw display
$79$ \( T^{2} + 10T + 8 \) Copy content Toggle raw display
$83$ \( (T - 10)^{2} \) Copy content Toggle raw display
$89$ \( T^{2} - T - 106 \) Copy content Toggle raw display
$97$ \( T^{2} - 26T + 152 \) Copy content Toggle raw display
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