Properties

Label 1280.2.d.k
Level $1280$
Weight $2$
Character orbit 1280.d
Analytic conductor $10.221$
Analytic rank $0$
Dimension $4$
CM no
Inner twists $2$

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Show commands: Magma / PariGP / SageMath

Newspace parameters

comment: Compute space of new eigenforms
 
[N,k,chi] = [1280,2,Mod(641,1280)]
 
mf = mfinit([N,k,chi],0)
 
lf = mfeigenbasis(mf)
 
from sage.modular.dirichlet import DirichletCharacter
 
H = DirichletGroup(1280, base_ring=CyclotomicField(2))
 
chi = DirichletCharacter(H, H._module([0, 1, 0]))
 
N = Newforms(chi, 2, names="a")
 
//Please install CHIMP (https://github.com/edgarcosta/CHIMP) if you want to run this code
 
chi := DirichletCharacter("1280.641");
 
S:= CuspForms(chi, 2);
 
N := Newforms(S);
 
Level: \( N \) \(=\) \( 1280 = 2^{8} \cdot 5 \)
Weight: \( k \) \(=\) \( 2 \)
Character orbit: \([\chi]\) \(=\) 1280.d (of order \(2\), degree \(1\), not 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: \(10.2208514587\)
Analytic rank: \(0\)
Dimension: \(4\)
Coefficient field: \(\Q(i, \sqrt{5})\)
comment: defining polynomial
 
gp: f.mod \\ as an extension of the character field
 
Defining polynomial: \( x^{4} + 3x^{2} + 1 \) Copy content Toggle raw display
Coefficient ring: \(\Z[a_1, \ldots, a_{5}]\)
Coefficient ring index: \( 2^{2} \)
Twist minimal: no (minimal twist has level 640)
Sato-Tate group: $\mathrm{SU}(2)[C_{2}]$

$q$-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 a basis \(1,\beta_1,\beta_2,\beta_3\) for the coefficient ring described below. We also show the integral \(q\)-expansion of the trace form.

\(f(q)\) \(=\) \( q + (\beta_{2} - \beta_1) q^{3} - \beta_1 q^{5} + ( - \beta_{3} - 1) q^{7} + (2 \beta_{3} - 3) q^{9}+O(q^{10}) \) Copy content Toggle raw display \( q + (\beta_{2} - \beta_1) q^{3} - \beta_1 q^{5} + ( - \beta_{3} - 1) q^{7} + (2 \beta_{3} - 3) q^{9} + 2 \beta_1 q^{11} + 2 \beta_{2} q^{13} + (\beta_{3} - 1) q^{15} + 2 \beta_{3} q^{17} - 2 \beta_{2} q^{19} - 4 \beta_1 q^{21} + (\beta_{3} - 7) q^{23} - q^{25} + ( - 2 \beta_{2} + 10 \beta_1) q^{27} + 2 \beta_1 q^{29} + ( - 2 \beta_{3} - 2) q^{31} + ( - 2 \beta_{3} + 2) q^{33} + (\beta_{2} + \beta_1) q^{35} + (4 \beta_{2} - 2 \beta_1) q^{37} + (2 \beta_{3} - 10) q^{39} + ( - 2 \beta_{3} - 8) q^{41} + (3 \beta_{2} + \beta_1) q^{43} + ( - 2 \beta_{2} + 3 \beta_1) q^{45} + (\beta_{3} + 5) q^{47} + (2 \beta_{3} - 1) q^{49} + ( - 2 \beta_{2} + 10 \beta_1) q^{51} + (2 \beta_{2} - 4 \beta_1) q^{53} + 2 q^{55} + ( - 2 \beta_{3} + 10) q^{57} + (2 \beta_{2} + 4 \beta_1) q^{59} + 6 \beta_1 q^{61} + (\beta_{3} - 7) q^{63} + 2 \beta_{3} q^{65} + (3 \beta_{2} + \beta_1) q^{67} + ( - 8 \beta_{2} + 12 \beta_1) q^{69} + ( - 2 \beta_{3} + 2) q^{71} - 2 \beta_{3} q^{73} + ( - \beta_{2} + \beta_1) q^{75} + ( - 2 \beta_{2} - 2 \beta_1) q^{77} + ( - 4 \beta_{3} - 4) q^{79} + ( - 6 \beta_{3} + 11) q^{81} + ( - 3 \beta_{2} + 3 \beta_1) q^{83} - 2 \beta_{2} q^{85} + ( - 2 \beta_{3} + 2) q^{87} + (4 \beta_{3} + 6) q^{89} + ( - 2 \beta_{2} - 10 \beta_1) q^{91} - 8 \beta_1 q^{93} - 2 \beta_{3} q^{95} + ( - 2 \beta_{3} - 12) q^{97} + (4 \beta_{2} - 6 \beta_1) q^{99}+O(q^{100}) \) Copy content Toggle raw display
\(\operatorname{Tr}(f)(q)\) \(=\) \( 4 q - 4 q^{7} - 12 q^{9}+O(q^{10}) \) Copy content Toggle raw display \( 4 q - 4 q^{7} - 12 q^{9} - 4 q^{15} - 28 q^{23} - 4 q^{25} - 8 q^{31} + 8 q^{33} - 40 q^{39} - 32 q^{41} + 20 q^{47} - 4 q^{49} + 8 q^{55} + 40 q^{57} - 28 q^{63} + 8 q^{71} - 16 q^{79} + 44 q^{81} + 8 q^{87} + 24 q^{89} - 48 q^{97}+O(q^{100}) \) Copy content Toggle raw display

Basis of coefficient ring in terms of a root \(\nu\) of \( x^{4} + 3x^{2} + 1 \) : Copy content Toggle raw display

\(\beta_{1}\)\(=\) \( \nu^{3} + 2\nu \) Copy content Toggle raw display
\(\beta_{2}\)\(=\) \( \nu^{3} + 4\nu \) Copy content Toggle raw display
\(\beta_{3}\)\(=\) \( 2\nu^{2} + 3 \) Copy content Toggle raw display
\(\nu\)\(=\) \( ( \beta_{2} - \beta_1 ) / 2 \) Copy content Toggle raw display
\(\nu^{2}\)\(=\) \( ( \beta_{3} - 3 ) / 2 \) Copy content Toggle raw display
\(\nu^{3}\)\(=\) \( -\beta_{2} + 2\beta_1 \) Copy content Toggle raw display

Character values

We give the values of \(\chi\) on generators for \(\left(\mathbb{Z}/1280\mathbb{Z}\right)^\times\).

\(n\) \(257\) \(261\) \(511\)
\(\chi(n)\) \(1\) \(-1\) \(1\)

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   \(\iota_m(\nu)\) \( a_{2} \) \( a_{3} \) \( a_{4} \) \( a_{5} \) \( a_{6} \) \( a_{7} \) \( a_{8} \) \( a_{9} \) \( a_{10} \)
641.1
1.61803i
0.618034i
0.618034i
1.61803i
0 3.23607i 0 1.00000i 0 1.23607 0 −7.47214 0
641.2 0 1.23607i 0 1.00000i 0 −3.23607 0 1.47214 0
641.3 0 1.23607i 0 1.00000i 0 −3.23607 0 1.47214 0
641.4 0 3.23607i 0 1.00000i 0 1.23607 0 −7.47214 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
8.b even 2 1 inner

Twists

       By twisting character orbit
Char Parity Ord Mult Type Twist Min Dim
1.a even 1 1 trivial 1280.2.d.k 4
4.b odd 2 1 1280.2.d.m 4
8.b even 2 1 inner 1280.2.d.k 4
8.d odd 2 1 1280.2.d.m 4
16.e even 4 1 640.2.a.j yes 2
16.e even 4 1 640.2.a.k yes 2
16.f odd 4 1 640.2.a.i 2
16.f odd 4 1 640.2.a.l yes 2
48.i odd 4 1 5760.2.a.cd 2
48.i odd 4 1 5760.2.a.ci 2
48.k even 4 1 5760.2.a.bw 2
48.k even 4 1 5760.2.a.ch 2
80.i odd 4 1 3200.2.c.v 4
80.i odd 4 1 3200.2.c.w 4
80.j even 4 1 3200.2.c.u 4
80.j even 4 1 3200.2.c.x 4
80.k odd 4 1 3200.2.a.bf 2
80.k odd 4 1 3200.2.a.bl 2
80.q even 4 1 3200.2.a.be 2
80.q even 4 1 3200.2.a.bk 2
80.s even 4 1 3200.2.c.u 4
80.s even 4 1 3200.2.c.x 4
80.t odd 4 1 3200.2.c.v 4
80.t odd 4 1 3200.2.c.w 4
    
        By twisted newform orbit
Twist Min Dim Char Parity Ord Mult Type
640.2.a.i 2 16.f odd 4 1
640.2.a.j yes 2 16.e even 4 1
640.2.a.k yes 2 16.e even 4 1
640.2.a.l yes 2 16.f odd 4 1
1280.2.d.k 4 1.a even 1 1 trivial
1280.2.d.k 4 8.b even 2 1 inner
1280.2.d.m 4 4.b odd 2 1
1280.2.d.m 4 8.d odd 2 1
3200.2.a.be 2 80.q even 4 1
3200.2.a.bf 2 80.k odd 4 1
3200.2.a.bk 2 80.q even 4 1
3200.2.a.bl 2 80.k odd 4 1
3200.2.c.u 4 80.j even 4 1
3200.2.c.u 4 80.s even 4 1
3200.2.c.v 4 80.i odd 4 1
3200.2.c.v 4 80.t odd 4 1
3200.2.c.w 4 80.i odd 4 1
3200.2.c.w 4 80.t odd 4 1
3200.2.c.x 4 80.j even 4 1
3200.2.c.x 4 80.s even 4 1
5760.2.a.bw 2 48.k even 4 1
5760.2.a.cd 2 48.i odd 4 1
5760.2.a.ch 2 48.k even 4 1
5760.2.a.ci 2 48.i odd 4 1

Hecke kernels

This newform subspace can be constructed as the intersection of the kernels of the following linear operators acting on \(S_{2}^{\mathrm{new}}(1280, [\chi])\):

\( T_{3}^{4} + 12T_{3}^{2} + 16 \) Copy content Toggle raw display
\( T_{7}^{2} + 2T_{7} - 4 \) Copy content Toggle raw display
\( T_{11}^{2} + 4 \) Copy content Toggle raw display
\( T_{31}^{2} + 4T_{31} - 16 \) Copy content Toggle raw display

Hecke characteristic polynomials

$p$ $F_p(T)$
$2$ \( T^{4} \) Copy content Toggle raw display
$3$ \( T^{4} + 12T^{2} + 16 \) Copy content Toggle raw display
$5$ \( (T^{2} + 1)^{2} \) Copy content Toggle raw display
$7$ \( (T^{2} + 2 T - 4)^{2} \) Copy content Toggle raw display
$11$ \( (T^{2} + 4)^{2} \) Copy content Toggle raw display
$13$ \( (T^{2} + 20)^{2} \) Copy content Toggle raw display
$17$ \( (T^{2} - 20)^{2} \) Copy content Toggle raw display
$19$ \( (T^{2} + 20)^{2} \) Copy content Toggle raw display
$23$ \( (T^{2} + 14 T + 44)^{2} \) Copy content Toggle raw display
$29$ \( (T^{2} + 4)^{2} \) Copy content Toggle raw display
$31$ \( (T^{2} + 4 T - 16)^{2} \) Copy content Toggle raw display
$37$ \( T^{4} + 168T^{2} + 5776 \) Copy content Toggle raw display
$41$ \( (T^{2} + 16 T + 44)^{2} \) Copy content Toggle raw display
$43$ \( T^{4} + 92T^{2} + 1936 \) Copy content Toggle raw display
$47$ \( (T^{2} - 10 T + 20)^{2} \) Copy content Toggle raw display
$53$ \( T^{4} + 72T^{2} + 16 \) Copy content Toggle raw display
$59$ \( T^{4} + 72T^{2} + 16 \) Copy content Toggle raw display
$61$ \( (T^{2} + 36)^{2} \) Copy content Toggle raw display
$67$ \( T^{4} + 92T^{2} + 1936 \) Copy content Toggle raw display
$71$ \( (T^{2} - 4 T - 16)^{2} \) Copy content Toggle raw display
$73$ \( (T^{2} - 20)^{2} \) Copy content Toggle raw display
$79$ \( (T^{2} + 8 T - 64)^{2} \) Copy content Toggle raw display
$83$ \( T^{4} + 108T^{2} + 1296 \) Copy content Toggle raw display
$89$ \( (T^{2} - 12 T - 44)^{2} \) Copy content Toggle raw display
$97$ \( (T^{2} + 24 T + 124)^{2} \) Copy content Toggle raw display
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