Properties

Label 855.2.a.g
Level $855$
Weight $2$
Character orbit 855.a
Self dual yes
Analytic conductor $6.827$
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] = [855,2,Mod(1,855)]
 
mf = mfinit([N,k,chi],0)
 
lf = mfeigenbasis(mf)
 
from sage.modular.dirichlet import DirichletCharacter
 
H = DirichletGroup(855, base_ring=CyclotomicField(2))
 
chi = DirichletCharacter(H, H._module([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("855.1");
 
S:= CuspForms(chi, 2);
 
N := Newforms(S);
 
Level: \( N \) \(=\) \( 855 = 3^{2} \cdot 5 \cdot 19 \)
Weight: \( k \) \(=\) \( 2 \)
Character orbit: \([\chi]\) \(=\) 855.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: \(6.82720937282\)
Analytic rank: \(0\)
Dimension: \(2\)
Coefficient field: \(\Q(\sqrt{7}) \)
comment: defining polynomial
 
gp: f.mod \\ as an extension of the character field
 
Defining polynomial: \( x^{2} - 7 \) Copy content Toggle raw display
Coefficient ring: \(\Z[a_1, a_2]\)
Coefficient ring index: \( 1 \)
Twist minimal: no (minimal twist has level 285)
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 \(\beta = \sqrt{7}\). We also show the integral \(q\)-expansion of the trace form.

\(f(q)\) \(=\) \( q + \beta q^{2} + 5 q^{4} - q^{5} + (\beta - 1) q^{7} + 3 \beta q^{8}+O(q^{10}) \) Copy content Toggle raw display \( q + \beta q^{2} + 5 q^{4} - q^{5} + (\beta - 1) q^{7} + 3 \beta q^{8} - \beta q^{10} + (\beta - 3) q^{11} + (\beta - 3) q^{13} + ( - \beta + 7) q^{14} + 11 q^{16} + 4 q^{17} - q^{19} - 5 q^{20} + ( - 3 \beta + 7) q^{22} + ( - 2 \beta - 4) q^{23} + q^{25} + ( - 3 \beta + 7) q^{26} + (5 \beta - 5) q^{28} + ( - 3 \beta - 1) q^{29} + 6 q^{31} + 5 \beta q^{32} + 4 \beta q^{34} + ( - \beta + 1) q^{35} + (\beta + 1) q^{37} - \beta q^{38} - 3 \beta q^{40} + (\beta + 7) q^{41} + (\beta + 3) q^{43} + (5 \beta - 15) q^{44} + ( - 4 \beta - 14) q^{46} + (2 \beta - 4) q^{47} + ( - 2 \beta + 1) q^{49} + \beta q^{50} + (5 \beta - 15) q^{52} + ( - 2 \beta - 6) q^{53} + ( - \beta + 3) q^{55} + ( - 3 \beta + 21) q^{56} + ( - \beta - 21) q^{58} + ( - 2 \beta - 6) q^{59} + ( - 2 \beta - 6) q^{61} + 6 \beta q^{62} + 13 q^{64} + ( - \beta + 3) q^{65} + ( - 4 \beta + 4) q^{67} + 20 q^{68} + (\beta - 7) q^{70} + ( - 2 \beta - 2) q^{71} + 10 q^{73} + (\beta + 7) q^{74} - 5 q^{76} + ( - 4 \beta + 10) q^{77} + (4 \beta - 4) q^{79} - 11 q^{80} + (7 \beta + 7) q^{82} - 6 q^{83} - 4 q^{85} + (3 \beta + 7) q^{86} + ( - 9 \beta + 21) q^{88} + (3 \beta + 9) q^{89} + ( - 4 \beta + 10) q^{91} + ( - 10 \beta - 20) q^{92} + ( - 4 \beta + 14) q^{94} + q^{95} + ( - 3 \beta + 5) q^{97} + (\beta - 14) q^{98} +O(q^{100}) \) Copy content Toggle raw display
\(\operatorname{Tr}(f)(q)\) \(=\) \( 2 q + 10 q^{4} - 2 q^{5} - 2 q^{7}+O(q^{10}) \) Copy content Toggle raw display \( 2 q + 10 q^{4} - 2 q^{5} - 2 q^{7} - 6 q^{11} - 6 q^{13} + 14 q^{14} + 22 q^{16} + 8 q^{17} - 2 q^{19} - 10 q^{20} + 14 q^{22} - 8 q^{23} + 2 q^{25} + 14 q^{26} - 10 q^{28} - 2 q^{29} + 12 q^{31} + 2 q^{35} + 2 q^{37} + 14 q^{41} + 6 q^{43} - 30 q^{44} - 28 q^{46} - 8 q^{47} + 2 q^{49} - 30 q^{52} - 12 q^{53} + 6 q^{55} + 42 q^{56} - 42 q^{58} - 12 q^{59} - 12 q^{61} + 26 q^{64} + 6 q^{65} + 8 q^{67} + 40 q^{68} - 14 q^{70} - 4 q^{71} + 20 q^{73} + 14 q^{74} - 10 q^{76} + 20 q^{77} - 8 q^{79} - 22 q^{80} + 14 q^{82} - 12 q^{83} - 8 q^{85} + 14 q^{86} + 42 q^{88} + 18 q^{89} + 20 q^{91} - 40 q^{92} + 28 q^{94} + 2 q^{95} + 10 q^{97} - 28 q^{98}+O(q^{100}) \) 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
−2.64575
2.64575
−2.64575 0 5.00000 −1.00000 0 −3.64575 −7.93725 0 2.64575
1.2 2.64575 0 5.00000 −1.00000 0 1.64575 7.93725 0 −2.64575
\(n\): e.g. 2-40 or 990-1000
Significant digits:
Format:

Atkin-Lehner signs

\( p \) Sign
\(3\) \( -1 \)
\(5\) \( +1 \)
\(19\) \( +1 \)

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 855.2.a.g 2
3.b odd 2 1 285.2.a.d 2
5.b even 2 1 4275.2.a.u 2
12.b even 2 1 4560.2.a.bo 2
15.d odd 2 1 1425.2.a.p 2
15.e even 4 2 1425.2.c.i 4
57.d even 2 1 5415.2.a.s 2
    
        By twisted newform orbit
Twist Min Dim Char Parity Ord Mult Type
285.2.a.d 2 3.b odd 2 1
855.2.a.g 2 1.a even 1 1 trivial
1425.2.a.p 2 15.d odd 2 1
1425.2.c.i 4 15.e even 4 2
4275.2.a.u 2 5.b even 2 1
4560.2.a.bo 2 12.b even 2 1
5415.2.a.s 2 57.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 \(S_{2}^{\mathrm{new}}(\Gamma_0(855))\):

\( T_{2}^{2} - 7 \) Copy content Toggle raw display
\( T_{7}^{2} + 2T_{7} - 6 \) Copy content Toggle raw display

Hecke characteristic polynomials

$p$ $F_p(T)$
$2$ \( T^{2} - 7 \) Copy content Toggle raw display
$3$ \( T^{2} \) Copy content Toggle raw display
$5$ \( (T + 1)^{2} \) Copy content Toggle raw display
$7$ \( T^{2} + 2T - 6 \) Copy content Toggle raw display
$11$ \( T^{2} + 6T + 2 \) Copy content Toggle raw display
$13$ \( T^{2} + 6T + 2 \) Copy content Toggle raw display
$17$ \( (T - 4)^{2} \) Copy content Toggle raw display
$19$ \( (T + 1)^{2} \) Copy content Toggle raw display
$23$ \( T^{2} + 8T - 12 \) Copy content Toggle raw display
$29$ \( T^{2} + 2T - 62 \) Copy content Toggle raw display
$31$ \( (T - 6)^{2} \) Copy content Toggle raw display
$37$ \( T^{2} - 2T - 6 \) Copy content Toggle raw display
$41$ \( T^{2} - 14T + 42 \) Copy content Toggle raw display
$43$ \( T^{2} - 6T + 2 \) Copy content Toggle raw display
$47$ \( T^{2} + 8T - 12 \) Copy content Toggle raw display
$53$ \( T^{2} + 12T + 8 \) Copy content Toggle raw display
$59$ \( T^{2} + 12T + 8 \) Copy content Toggle raw display
$61$ \( T^{2} + 12T + 8 \) Copy content Toggle raw display
$67$ \( T^{2} - 8T - 96 \) Copy content Toggle raw display
$71$ \( T^{2} + 4T - 24 \) Copy content Toggle raw display
$73$ \( (T - 10)^{2} \) Copy content Toggle raw display
$79$ \( T^{2} + 8T - 96 \) Copy content Toggle raw display
$83$ \( (T + 6)^{2} \) Copy content Toggle raw display
$89$ \( T^{2} - 18T + 18 \) Copy content Toggle raw display
$97$ \( T^{2} - 10T - 38 \) Copy content Toggle raw display
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