Properties

Label 855.2.a.f
Level $855$
Weight $2$
Character orbit 855.a
Self dual yes
Analytic conductor $6.827$
Analytic rank $1$
Dimension $2$
CM no
Inner twists $1$

Related objects

Downloads

Learn more

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: \(1\)
Dimension: \(2\)
Coefficient field: \(\Q(\sqrt{3}) \)
comment: defining polynomial
 
gp: f.mod \\ as an extension of the character field
 
Defining polynomial: \( x^{2} - 3 \) 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 \(\beta = \sqrt{3}\). We also show the integral \(q\)-expansion of the trace form.

\(f(q)\) \(=\) \( q + \beta q^{2} + q^{4} - q^{5} + ( - \beta - 1) q^{7} - \beta q^{8} +O(q^{10}) \) Copy content Toggle raw display \( q + \beta q^{2} + q^{4} - q^{5} + ( - \beta - 1) q^{7} - \beta q^{8} - \beta q^{10} + ( - \beta - 3) q^{11} + (\beta - 1) q^{13} + ( - \beta - 3) q^{14} - 5 q^{16} + q^{19} - q^{20} + ( - 3 \beta - 3) q^{22} - 2 \beta q^{23} + q^{25} + ( - \beta + 3) q^{26} + ( - \beta - 1) q^{28} + ( - 3 \beta - 3) q^{29} + (4 \beta + 2) q^{31} - 3 \beta q^{32} + (\beta + 1) q^{35} + ( - 3 \beta - 1) q^{37} + \beta q^{38} + \beta q^{40} + (\beta - 3) q^{41} + (3 \beta - 1) q^{43} + ( - \beta - 3) q^{44} - 6 q^{46} + 2 \beta q^{47} + (2 \beta - 3) q^{49} + \beta q^{50} + (\beta - 1) q^{52} + (2 \beta + 6) q^{53} + (\beta + 3) q^{55} + (\beta + 3) q^{56} + ( - 3 \beta - 9) q^{58} + (2 \beta - 6) q^{59} + (2 \beta - 10) q^{61} + (2 \beta + 12) q^{62} + q^{64} + ( - \beta + 1) q^{65} + 8 q^{67} + (\beta + 3) q^{70} + (6 \beta - 6) q^{71} + ( - 4 \beta - 10) q^{73} + ( - \beta - 9) q^{74} + q^{76} + (4 \beta + 6) q^{77} + ( - 4 \beta - 4) q^{79} + 5 q^{80} + ( - 3 \beta + 3) q^{82} + (4 \beta + 6) q^{83} + ( - \beta + 9) q^{86} + (3 \beta + 3) q^{88} + ( - \beta - 9) q^{89} - 2 q^{91} - 2 \beta q^{92} + 6 q^{94} - q^{95} + ( - 3 \beta - 1) q^{97} + ( - 3 \beta + 6) q^{98} +O(q^{100}) \) Copy content Toggle raw display
\(\operatorname{Tr}(f)(q)\) \(=\) \( 2 q + 2 q^{4} - 2 q^{5} - 2 q^{7}+O(q^{10}) \) Copy content Toggle raw display \( 2 q + 2 q^{4} - 2 q^{5} - 2 q^{7} - 6 q^{11} - 2 q^{13} - 6 q^{14} - 10 q^{16} + 2 q^{19} - 2 q^{20} - 6 q^{22} + 2 q^{25} + 6 q^{26} - 2 q^{28} - 6 q^{29} + 4 q^{31} + 2 q^{35} - 2 q^{37} - 6 q^{41} - 2 q^{43} - 6 q^{44} - 12 q^{46} - 6 q^{49} - 2 q^{52} + 12 q^{53} + 6 q^{55} + 6 q^{56} - 18 q^{58} - 12 q^{59} - 20 q^{61} + 24 q^{62} + 2 q^{64} + 2 q^{65} + 16 q^{67} + 6 q^{70} - 12 q^{71} - 20 q^{73} - 18 q^{74} + 2 q^{76} + 12 q^{77} - 8 q^{79} + 10 q^{80} + 6 q^{82} + 12 q^{83} + 18 q^{86} + 6 q^{88} - 18 q^{89} - 4 q^{91} + 12 q^{94} - 2 q^{95} - 2 q^{97} + 12 q^{98}+O(q^{100}) \) 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
−1.73205
1.73205
−1.73205 0 1.00000 −1.00000 0 0.732051 1.73205 0 1.73205
1.2 1.73205 0 1.00000 −1.00000 0 −2.73205 −1.73205 0 −1.73205
\(n\): 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.f 2
3.b odd 2 1 285.2.a.e 2
5.b even 2 1 4275.2.a.t 2
12.b even 2 1 4560.2.a.bh 2
15.d odd 2 1 1425.2.a.o 2
15.e even 4 2 1425.2.c.k 4
57.d even 2 1 5415.2.a.r 2
    
        By twisted newform orbit
Twist Min Dim Char Parity Ord Mult Type
285.2.a.e 2 3.b odd 2 1
855.2.a.f 2 1.a even 1 1 trivial
1425.2.a.o 2 15.d odd 2 1
1425.2.c.k 4 15.e even 4 2
4275.2.a.t 2 5.b even 2 1
4560.2.a.bh 2 12.b even 2 1
5415.2.a.r 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 \(S_{2}^{\mathrm{new}}(\Gamma_0(855))\):

\( T_{2}^{2} - 3 \) Copy content Toggle raw display
\( T_{7}^{2} + 2T_{7} - 2 \) Copy content Toggle raw display

Hecke characteristic polynomials

$p$ $F_p(T)$
$2$ \( T^{2} - 3 \) Copy content Toggle raw display
$3$ \( T^{2} \) Copy content Toggle raw display
$5$ \( (T + 1)^{2} \) Copy content Toggle raw display
$7$ \( T^{2} + 2T - 2 \) Copy content Toggle raw display
$11$ \( T^{2} + 6T + 6 \) Copy content Toggle raw display
$13$ \( T^{2} + 2T - 2 \) Copy content Toggle raw display
$17$ \( T^{2} \) Copy content Toggle raw display
$19$ \( (T - 1)^{2} \) Copy content Toggle raw display
$23$ \( T^{2} - 12 \) Copy content Toggle raw display
$29$ \( T^{2} + 6T - 18 \) Copy content Toggle raw display
$31$ \( T^{2} - 4T - 44 \) Copy content Toggle raw display
$37$ \( T^{2} + 2T - 26 \) Copy content Toggle raw display
$41$ \( T^{2} + 6T + 6 \) Copy content Toggle raw display
$43$ \( T^{2} + 2T - 26 \) Copy content Toggle raw display
$47$ \( T^{2} - 12 \) Copy content Toggle raw display
$53$ \( T^{2} - 12T + 24 \) Copy content Toggle raw display
$59$ \( T^{2} + 12T + 24 \) Copy content Toggle raw display
$61$ \( T^{2} + 20T + 88 \) Copy content Toggle raw display
$67$ \( (T - 8)^{2} \) Copy content Toggle raw display
$71$ \( T^{2} + 12T - 72 \) Copy content Toggle raw display
$73$ \( T^{2} + 20T + 52 \) Copy content Toggle raw display
$79$ \( T^{2} + 8T - 32 \) Copy content Toggle raw display
$83$ \( T^{2} - 12T - 12 \) Copy content Toggle raw display
$89$ \( T^{2} + 18T + 78 \) Copy content Toggle raw display
$97$ \( T^{2} + 2T - 26 \) Copy content Toggle raw display
show more
show less