Properties

Label 2020.1.bc.a
Level $2020$
Weight $1$
Character orbit 2020.bc
Analytic conductor $1.008$
Analytic rank $0$
Dimension $8$
Projective image $D_{20}$
CM discriminant -4
Inner twists $4$

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Show commands: Magma / PariGP / SageMath

Newspace parameters

comment: Compute space of new eigenforms
 
[N,k,chi] = [2020,1,Mod(163,2020)]
 
mf = mfinit([N,k,chi],0)
 
lf = mfeigenbasis(mf)
 
from sage.modular.dirichlet import DirichletCharacter
 
H = DirichletGroup(2020, base_ring=CyclotomicField(20))
 
chi = DirichletCharacter(H, H._module([10, 15, 17]))
 
N = Newforms(chi, 1, names="a")
 
//Please install CHIMP (https://github.com/edgarcosta/CHIMP) if you want to run this code
 
chi := DirichletCharacter("2020.163");
 
S:= CuspForms(chi, 1);
 
N := Newforms(S);
 
Level: \( N \) \(=\) \( 2020 = 2^{2} \cdot 5 \cdot 101 \)
Weight: \( k \) \(=\) \( 1 \)
Character orbit: \([\chi]\) \(=\) 2020.bc (of order \(20\), degree \(8\), minimal)

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: no
Analytic conductor: \(1.00811132552\)
Analytic rank: \(0\)
Dimension: \(8\)
Coefficient field: \(\Q(\zeta_{20})\)
comment: defining polynomial
 
gp: f.mod \\ as an extension of the character field
 
Defining polynomial: \( x^{8} - x^{6} + x^{4} - x^{2} + 1 \) Copy content Toggle raw display
Coefficient ring: \(\Z[a_1, \ldots, a_{5}]\)
Coefficient ring index: \( 1 \)
Twist minimal: yes
Projective image: \(D_{20}\)
Projective field: Galois closure of \(\mathbb{Q}[x]/(x^{20} - \cdots)\)

$q$-expansion

comment: q-expansion
 
sage: f.q_expansion() # note that sage often uses an isomorphic number field
 
gp: mfcoefs(f, 20)
 

The \(q\)-expansion and trace form are shown below.

\(f(q)\) \(=\) \( q + \zeta_{20}^{6} q^{2} - \zeta_{20}^{2} q^{4} + \zeta_{20}^{7} q^{5} - \zeta_{20}^{8} q^{8} - \zeta_{20}^{8} q^{9} +O(q^{10}) \) Copy content Toggle raw display \( q + \zeta_{20}^{6} q^{2} - \zeta_{20}^{2} q^{4} + \zeta_{20}^{7} q^{5} - \zeta_{20}^{8} q^{8} - \zeta_{20}^{8} q^{9} - \zeta_{20}^{3} q^{10} + (\zeta_{20}^{7} - 1) q^{13} + \zeta_{20}^{4} q^{16} + (\zeta_{20}^{5} - 1) q^{17} + \zeta_{20}^{4} q^{18} - \zeta_{20}^{9} q^{20} - \zeta_{20}^{4} q^{25} + ( - \zeta_{20}^{6} - \zeta_{20}^{3}) q^{26} + (\zeta_{20}^{6} + \zeta_{20}) q^{29} - q^{32} + ( - \zeta_{20}^{6} - \zeta_{20}) q^{34} - q^{36} + ( - \zeta_{20}^{4} + \zeta_{20}^{3}) q^{37} + \zeta_{20}^{5} q^{40} + (\zeta_{20}^{9} + \zeta_{20}^{6}) q^{41} + \zeta_{20}^{5} q^{45} + \zeta_{20}^{8} q^{49} + q^{50} + ( - \zeta_{20}^{9} + \zeta_{20}^{2}) q^{52} + (\zeta_{20}^{9} + \zeta_{20}^{7}) q^{53} + (\zeta_{20}^{7} - \zeta_{20}^{2}) q^{58} + ( - \zeta_{20}^{5} + \zeta_{20}^{4}) q^{61} - \zeta_{20}^{6} q^{64} + ( - \zeta_{20}^{7} - \zeta_{20}^{4}) q^{65} + ( - \zeta_{20}^{7} + \zeta_{20}^{2}) q^{68} - \zeta_{20}^{6} q^{72} + (\zeta_{20}^{9} - \zeta_{20}^{3}) q^{73} + (\zeta_{20}^{9} + 1) q^{74} - \zeta_{20} q^{80} - \zeta_{20}^{6} q^{81} + ( - \zeta_{20}^{5} - \zeta_{20}^{2}) q^{82} + ( - \zeta_{20}^{7} - \zeta_{20}^{2}) q^{85} + ( - \zeta_{20}^{9} - \zeta_{20}^{8}) q^{89} - \zeta_{20} q^{90} + ( - \zeta_{20}^{8} - \zeta_{20}) q^{97} - \zeta_{20}^{4} q^{98} +O(q^{100}) \) Copy content Toggle raw display
\(\operatorname{Tr}(f)(q)\) \(=\) \( 8 q + 2 q^{2} - 2 q^{4} + 2 q^{8} + 2 q^{9}+O(q^{10}) \) Copy content Toggle raw display \( 8 q + 2 q^{2} - 2 q^{4} + 2 q^{8} + 2 q^{9} - 8 q^{13} - 2 q^{16} - 8 q^{17} - 2 q^{18} + 2 q^{25} - 2 q^{26} + 2 q^{29} - 8 q^{32} - 2 q^{34} - 8 q^{36} + 2 q^{37} + 2 q^{41} - 2 q^{49} + 8 q^{50} + 2 q^{52} - 2 q^{58} - 2 q^{61} - 2 q^{64} + 2 q^{65} + 2 q^{68} - 2 q^{72} + 8 q^{74} - 2 q^{81} - 2 q^{82} - 2 q^{85} + 2 q^{89} + 2 q^{97} + 2 q^{98}+O(q^{100}) \) Copy content Toggle raw display

Character values

We give the values of \(\chi\) on generators for \(\left(\mathbb{Z}/2020\mathbb{Z}\right)^\times\).

\(n\) \(1011\) \(1617\) \(1921\)
\(\chi(n)\) \(-1\) \(\zeta_{20}^{5}\) \(\zeta_{20}^{7}\)

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   \(\iota_m(\nu)\) \( a_{2} \) \( a_{3} \) \( a_{4} \) \( a_{5} \) \( a_{6} \) \( a_{7} \) \( a_{8} \) \( a_{9} \) \( a_{10} \)
163.1
−0.951057 0.309017i
−0.587785 + 0.809017i
−0.951057 + 0.309017i
0.951057 0.309017i
0.587785 0.809017i
0.951057 + 0.309017i
0.587785 + 0.809017i
−0.587785 0.809017i
−0.309017 + 0.951057i 0 −0.809017 0.587785i 0.587785 0.809017i 0 0 0.809017 0.587785i 0.809017 0.587785i 0.587785 + 0.809017i
243.1 0.809017 + 0.587785i 0 0.309017 + 0.951057i −0.951057 + 0.309017i 0 0 −0.309017 + 0.951057i −0.309017 + 0.951057i −0.951057 0.309017i
347.1 −0.309017 0.951057i 0 −0.809017 + 0.587785i 0.587785 + 0.809017i 0 0 0.809017 + 0.587785i 0.809017 + 0.587785i 0.587785 0.809017i
663.1 −0.309017 0.951057i 0 −0.809017 + 0.587785i −0.587785 0.809017i 0 0 0.809017 + 0.587785i 0.809017 + 0.587785i −0.587785 + 0.809017i
767.1 0.809017 + 0.587785i 0 0.309017 + 0.951057i 0.951057 0.309017i 0 0 −0.309017 + 0.951057i −0.309017 + 0.951057i 0.951057 + 0.309017i
847.1 −0.309017 + 0.951057i 0 −0.809017 0.587785i −0.587785 + 0.809017i 0 0 0.809017 0.587785i 0.809017 0.587785i −0.587785 0.809017i
1143.1 0.809017 0.587785i 0 0.309017 0.951057i 0.951057 + 0.309017i 0 0 −0.309017 0.951057i −0.309017 0.951057i 0.951057 0.309017i
1887.1 0.809017 0.587785i 0 0.309017 0.951057i −0.951057 0.309017i 0 0 −0.309017 0.951057i −0.309017 0.951057i −0.951057 + 0.309017i
\(n\): e.g. 2-40 or 990-1000
Embeddings: e.g. 1-3 or 163.1
Significant digits:
Format:

Inner twists

Char Parity Ord Mult Type
1.a even 1 1 trivial
4.b odd 2 1 CM by \(\Q(\sqrt{-1}) \)
505.o even 20 1 inner
2020.bc odd 20 1 inner

Twists

       By twisting character orbit
Char Parity Ord Mult Type Twist Min Dim
1.a even 1 1 trivial 2020.1.bc.a 8
4.b odd 2 1 CM 2020.1.bc.a 8
5.c odd 4 1 2020.1.bm.a yes 8
20.e even 4 1 2020.1.bm.a yes 8
101.f odd 20 1 2020.1.bm.a yes 8
404.l even 20 1 2020.1.bm.a yes 8
505.o even 20 1 inner 2020.1.bc.a 8
2020.bc odd 20 1 inner 2020.1.bc.a 8
    
        By twisted newform orbit
Twist Min Dim Char Parity Ord Mult Type
2020.1.bc.a 8 1.a even 1 1 trivial
2020.1.bc.a 8 4.b odd 2 1 CM
2020.1.bc.a 8 505.o even 20 1 inner
2020.1.bc.a 8 2020.bc odd 20 1 inner
2020.1.bm.a yes 8 5.c odd 4 1
2020.1.bm.a yes 8 20.e even 4 1
2020.1.bm.a yes 8 101.f odd 20 1
2020.1.bm.a yes 8 404.l even 20 1

Hecke kernels

This newform subspace is the entire newspace \(S_{1}^{\mathrm{new}}(2020, [\chi])\).

Hecke characteristic polynomials

$p$ $F_p(T)$
$2$ \( (T^{4} - T^{3} + T^{2} - T + 1)^{2} \) Copy content Toggle raw display
$3$ \( T^{8} \) Copy content Toggle raw display
$5$ \( T^{8} - T^{6} + T^{4} - T^{2} + 1 \) Copy content Toggle raw display
$7$ \( T^{8} \) Copy content Toggle raw display
$11$ \( T^{8} \) Copy content Toggle raw display
$13$ \( T^{8} + 8 T^{7} + 27 T^{6} + 50 T^{5} + \cdots + 1 \) Copy content Toggle raw display
$17$ \( (T^{2} + 2 T + 2)^{4} \) Copy content Toggle raw display
$19$ \( T^{8} \) Copy content Toggle raw display
$23$ \( T^{8} \) Copy content Toggle raw display
$29$ \( T^{8} - 2 T^{7} + 2 T^{6} - 4 T^{4} + \cdots + 16 \) Copy content Toggle raw display
$31$ \( T^{8} \) Copy content Toggle raw display
$37$ \( T^{8} - 2 T^{7} + 2 T^{6} - 10 T^{5} + \cdots + 1 \) Copy content Toggle raw display
$41$ \( T^{8} - 2 T^{7} + 2 T^{6} + 11 T^{4} + \cdots + 1 \) Copy content Toggle raw display
$43$ \( T^{8} \) Copy content Toggle raw display
$47$ \( T^{8} \) Copy content Toggle raw display
$53$ \( T^{8} + 10 T^{4} + 25 T^{2} + 25 \) Copy content Toggle raw display
$59$ \( T^{8} \) Copy content Toggle raw display
$61$ \( T^{8} + 2 T^{7} + 7 T^{6} + 10 T^{5} + \cdots + 1 \) Copy content Toggle raw display
$67$ \( T^{8} \) Copy content Toggle raw display
$71$ \( T^{8} \) Copy content Toggle raw display
$73$ \( T^{8} - 4 T^{6} + 6 T^{4} + T^{2} + 1 \) Copy content Toggle raw display
$79$ \( T^{8} \) Copy content Toggle raw display
$83$ \( T^{8} \) Copy content Toggle raw display
$89$ \( T^{8} - 2 T^{7} + 2 T^{6} - 4 T^{4} + \cdots + 1 \) Copy content Toggle raw display
$97$ \( T^{8} - 2 T^{7} + 2 T^{6} - 10 T^{5} + \cdots + 1 \) Copy content Toggle raw display
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