Properties

Label 2016.1.dn.a
Level $2016$
Weight $1$
Character orbit 2016.dn
Analytic conductor $1.006$
Analytic rank $0$
Dimension $4$
Projective image $D_{8}$
CM discriminant -7
Inner twists $4$

Related objects

Downloads

Learn more

Show commands: Magma / PariGP / SageMath

Newspace parameters

comment: Compute space of new eigenforms
 
[N,k,chi] = [2016,1,Mod(251,2016)]
 
mf = mfinit([N,k,chi],0)
 
lf = mfeigenbasis(mf)
 
from sage.modular.dirichlet import DirichletCharacter
 
H = DirichletGroup(2016, base_ring=CyclotomicField(8))
 
chi = DirichletCharacter(H, H._module([4, 1, 4, 4]))
 
N = Newforms(chi, 1, names="a")
 
//Please install CHIMP (https://github.com/edgarcosta/CHIMP) if you want to run this code
 
chi := DirichletCharacter("2016.251");
 
S:= CuspForms(chi, 1);
 
N := Newforms(S);
 
Level: \( N \) \(=\) \( 2016 = 2^{5} \cdot 3^{2} \cdot 7 \)
Weight: \( k \) \(=\) \( 1 \)
Character orbit: \([\chi]\) \(=\) 2016.dn (of order \(8\), degree \(4\), 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: \(1.00611506547\)
Analytic rank: \(0\)
Dimension: \(4\)
Coefficient field: \(\Q(\zeta_{8})\)
comment: defining polynomial
 
gp: f.mod \\ as an extension of the character field
 
Defining polynomial: \( x^{4} + 1 \) Copy content Toggle raw display
Coefficient ring: \(\Z[a_1, \ldots, a_{7}]\)
Coefficient ring index: \( 1 \)
Twist minimal: yes
Projective image: \(D_{8}\)
Projective field: Galois closure of 8.0.3758802906120192.31

$q$-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.

\(f(q)\) \(=\) \( q - q^{2} + q^{4} + \zeta_{8}^{3} q^{7} - q^{8}+O(q^{10}) \) Copy content Toggle raw display \( q - q^{2} + q^{4} + \zeta_{8}^{3} q^{7} - q^{8} + (\zeta_{8}^{3} - \zeta_{8}^{2}) q^{11} - \zeta_{8}^{3} q^{14} + q^{16} + ( - \zeta_{8}^{3} + \zeta_{8}^{2}) q^{22} + \zeta_{8} q^{25} + \zeta_{8}^{3} q^{28} + (\zeta_{8}^{2} + \zeta_{8}) q^{29} - q^{32} + (\zeta_{8} - 1) q^{37} + (\zeta_{8}^{3} + \zeta_{8}^{2}) q^{43} + (\zeta_{8}^{3} - \zeta_{8}^{2}) q^{44} - \zeta_{8}^{2} q^{49} - \zeta_{8} q^{50} + (\zeta_{8}^{3} + \zeta_{8}^{2}) q^{53} - \zeta_{8}^{3} q^{56} + ( - \zeta_{8}^{2} - \zeta_{8}) q^{58} + q^{64} + ( - \zeta_{8}^{3} - 1) q^{67} + (\zeta_{8}^{2} + 1) q^{71} + ( - \zeta_{8} + 1) q^{74} + ( - \zeta_{8}^{2} + \zeta_{8}) q^{77} + (\zeta_{8}^{3} - \zeta_{8}) q^{79} + ( - \zeta_{8}^{3} - \zeta_{8}^{2}) q^{86} + ( - \zeta_{8}^{3} + \zeta_{8}^{2}) q^{88} + \zeta_{8}^{2} q^{98} +O(q^{100}) \) Copy content Toggle raw display
\(\operatorname{Tr}(f)(q)\) \(=\) \( 4 q - 4 q^{2} + 4 q^{4} - 4 q^{8}+O(q^{10}) \) Copy content Toggle raw display \( 4 q - 4 q^{2} + 4 q^{4} - 4 q^{8} + 4 q^{16} - 4 q^{32} - 4 q^{37} + 4 q^{64} - 4 q^{67} + 4 q^{71} + 4 q^{74}+O(q^{100}) \) Copy content Toggle raw display

Character values

We give the values of \(\chi\) on generators for \(\left(\mathbb{Z}/2016\mathbb{Z}\right)^\times\).

\(n\) \(127\) \(577\) \(1765\) \(1793\)
\(\chi(n)\) \(-1\) \(-1\) \(-\zeta_{8}\) \(-1\)

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   \(\iota_m(\nu)\) \( a_{2} \) \( a_{3} \) \( a_{4} \) \( a_{5} \) \( a_{6} \) \( a_{7} \) \( a_{8} \) \( a_{9} \) \( a_{10} \)
251.1
−0.707107 0.707107i
−0.707107 + 0.707107i
0.707107 + 0.707107i
0.707107 0.707107i
−1.00000 0 1.00000 0 0 0.707107 0.707107i −1.00000 0 0
755.1 −1.00000 0 1.00000 0 0 0.707107 + 0.707107i −1.00000 0 0
1259.1 −1.00000 0 1.00000 0 0 −0.707107 + 0.707107i −1.00000 0 0
1763.1 −1.00000 0 1.00000 0 0 −0.707107 0.707107i −1.00000 0 0
\(n\): e.g. 2-40 or 990-1000
Significant digits:
Format:

Inner twists

Char Parity Ord Mult Type
1.a even 1 1 trivial
7.b odd 2 1 CM by \(\Q(\sqrt{-7}) \)
96.o even 8 1 inner
672.br odd 8 1 inner

Twists

       By twisting character orbit
Char Parity Ord Mult Type Twist Min Dim
1.a even 1 1 trivial 2016.1.dn.a 4
3.b odd 2 1 2016.1.dn.d yes 4
7.b odd 2 1 CM 2016.1.dn.a 4
21.c even 2 1 2016.1.dn.d yes 4
32.h odd 8 1 2016.1.dn.d yes 4
96.o even 8 1 inner 2016.1.dn.a 4
224.x even 8 1 2016.1.dn.d yes 4
672.br odd 8 1 inner 2016.1.dn.a 4
    
        By twisted newform orbit
Twist Min Dim Char Parity Ord Mult Type
2016.1.dn.a 4 1.a even 1 1 trivial
2016.1.dn.a 4 7.b odd 2 1 CM
2016.1.dn.a 4 96.o even 8 1 inner
2016.1.dn.a 4 672.br odd 8 1 inner
2016.1.dn.d yes 4 3.b odd 2 1
2016.1.dn.d yes 4 21.c even 2 1
2016.1.dn.d yes 4 32.h odd 8 1
2016.1.dn.d yes 4 224.x even 8 1

Hecke kernels

This newform subspace can be constructed as the kernel of the linear operator \( T_{11}^{4} + 2T_{11}^{2} + 4T_{11} + 2 \) acting on \(S_{1}^{\mathrm{new}}(2016, [\chi])\). Copy content Toggle raw display

Hecke characteristic polynomials

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