Properties

Label 1920.1.bm.a
Level $1920$
Weight $1$
Character orbit 1920.bm
Analytic conductor $0.958$
Analytic rank $0$
Dimension $4$
Projective image $D_{4}$
CM discriminant -15
Inner twists $8$

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Show commands: Magma / PariGP / SageMath

Newspace parameters

comment: Compute space of new eigenforms
 
[N,k,chi] = [1920,1,Mod(929,1920)]
 
mf = mfinit([N,k,chi],0)
 
lf = mfeigenbasis(mf)
 
from sage.modular.dirichlet import DirichletCharacter
 
H = DirichletGroup(1920, base_ring=CyclotomicField(4))
 
chi = DirichletCharacter(H, H._module([0, 3, 2, 2]))
 
N = Newforms(chi, 1, names="a")
 
//Please install CHIMP (https://github.com/edgarcosta/CHIMP) if you want to run this code
 
chi := DirichletCharacter("1920.929");
 
S:= CuspForms(chi, 1);
 
N := Newforms(S);
 
Level: \( N \) \(=\) \( 1920 = 2^{7} \cdot 3 \cdot 5 \)
Weight: \( k \) \(=\) \( 1 \)
Character orbit: \([\chi]\) \(=\) 1920.bm (of order \(4\), degree \(2\), 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: \(0.958204824255\)
Analytic rank: \(0\)
Dimension: \(4\)
Relative dimension: \(2\) over \(\Q(i)\)
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: \(\Z[a_1, a_2, a_3]\)
Coefficient ring index: \( 1 \)
Twist minimal: no (minimal twist has level 240)
Projective image: \(D_{4}\)
Projective field: Galois closure of 4.0.92160.2

$q$-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.

\(f(q)\) \(=\) \( q + \zeta_{8} q^{3} + \zeta_{8}^{3} q^{5} + \zeta_{8}^{2} q^{9}+O(q^{10}) \) Copy content Toggle raw display \( q + \zeta_{8} q^{3} + \zeta_{8}^{3} q^{5} + \zeta_{8}^{2} q^{9} - q^{15} + (\zeta_{8}^{3} - \zeta_{8}) q^{17} + (\zeta_{8}^{2} + 1) q^{19} + (\zeta_{8}^{3} + \zeta_{8}) q^{23} - \zeta_{8}^{2} q^{25} + \zeta_{8}^{3} q^{27} - \zeta_{8} q^{45} + ( - \zeta_{8}^{3} + \zeta_{8}) q^{47} - q^{49} + ( - \zeta_{8}^{2} - 1) q^{51} + (\zeta_{8}^{3} + \zeta_{8}) q^{57} + ( - \zeta_{8}^{2} - 1) q^{61} + (\zeta_{8}^{2} - 1) q^{69} - \zeta_{8}^{3} q^{75} + 2 q^{79} - q^{81} + ( - \zeta_{8}^{2} + 1) q^{85} + (\zeta_{8}^{3} - \zeta_{8}) q^{95} +O(q^{100}) \) Copy content Toggle raw display
\(\operatorname{Tr}(f)(q)\) \(=\) \( 4 q+O(q^{10}) \) Copy content Toggle raw display \( 4 q - 4 q^{15} + 4 q^{19} - 4 q^{49} - 4 q^{51} - 4 q^{61} - 4 q^{69} + 8 q^{79} - 4 q^{81} + 4 q^{85}+O(q^{100}) \) Copy content Toggle raw display

Character values

We give the values of \(\chi\) on generators for \(\left(\mathbb{Z}/1920\mathbb{Z}\right)^\times\).

\(n\) \(511\) \(641\) \(901\) \(1537\)
\(\chi(n)\) \(1\) \(-1\) \(-\zeta_{8}^{2}\) \(-1\)

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   \(\iota_m(\nu)\) \( a_{2} \) \( a_{3} \) \( a_{4} \) \( a_{5} \) \( a_{6} \) \( a_{7} \) \( a_{8} \) \( a_{9} \) \( a_{10} \)
929.1
−0.707107 0.707107i
0.707107 + 0.707107i
−0.707107 + 0.707107i
0.707107 0.707107i
0 −0.707107 0.707107i 0 0.707107 0.707107i 0 0 0 1.00000i 0
929.2 0 0.707107 + 0.707107i 0 −0.707107 + 0.707107i 0 0 0 1.00000i 0
1889.1 0 −0.707107 + 0.707107i 0 0.707107 + 0.707107i 0 0 0 1.00000i 0
1889.2 0 0.707107 0.707107i 0 −0.707107 0.707107i 0 0 0 1.00000i 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
15.d odd 2 1 CM by \(\Q(\sqrt{-15}) \)
3.b odd 2 1 inner
5.b even 2 1 inner
16.e even 4 1 inner
48.i odd 4 1 inner
80.q even 4 1 inner
240.bm odd 4 1 inner

Twists

       By twisting character orbit
Char Parity Ord Mult Type Twist Min Dim
1.a even 1 1 trivial 1920.1.bm.a 4
3.b odd 2 1 inner 1920.1.bm.a 4
4.b odd 2 1 1920.1.bm.b 4
5.b even 2 1 inner 1920.1.bm.a 4
8.b even 2 1 240.1.bm.a 4
8.d odd 2 1 960.1.bm.a 4
12.b even 2 1 1920.1.bm.b 4
15.d odd 2 1 CM 1920.1.bm.a 4
16.e even 4 1 240.1.bm.a 4
16.e even 4 1 inner 1920.1.bm.a 4
16.f odd 4 1 960.1.bm.a 4
16.f odd 4 1 1920.1.bm.b 4
20.d odd 2 1 1920.1.bm.b 4
24.f even 2 1 960.1.bm.a 4
24.h odd 2 1 240.1.bm.a 4
40.e odd 2 1 960.1.bm.a 4
40.f even 2 1 240.1.bm.a 4
40.i odd 4 2 1200.1.r.a 4
48.i odd 4 1 240.1.bm.a 4
48.i odd 4 1 inner 1920.1.bm.a 4
48.k even 4 1 960.1.bm.a 4
48.k even 4 1 1920.1.bm.b 4
60.h even 2 1 1920.1.bm.b 4
80.i odd 4 1 1200.1.r.a 4
80.k odd 4 1 960.1.bm.a 4
80.k odd 4 1 1920.1.bm.b 4
80.q even 4 1 240.1.bm.a 4
80.q even 4 1 inner 1920.1.bm.a 4
80.t odd 4 1 1200.1.r.a 4
120.i odd 2 1 240.1.bm.a 4
120.m even 2 1 960.1.bm.a 4
120.w even 4 2 1200.1.r.a 4
240.t even 4 1 960.1.bm.a 4
240.t even 4 1 1920.1.bm.b 4
240.bb even 4 1 1200.1.r.a 4
240.bf even 4 1 1200.1.r.a 4
240.bm odd 4 1 240.1.bm.a 4
240.bm odd 4 1 inner 1920.1.bm.a 4
    
        By twisted newform orbit
Twist Min Dim Char Parity Ord Mult Type
240.1.bm.a 4 8.b even 2 1
240.1.bm.a 4 16.e even 4 1
240.1.bm.a 4 24.h odd 2 1
240.1.bm.a 4 40.f even 2 1
240.1.bm.a 4 48.i odd 4 1
240.1.bm.a 4 80.q even 4 1
240.1.bm.a 4 120.i odd 2 1
240.1.bm.a 4 240.bm odd 4 1
960.1.bm.a 4 8.d odd 2 1
960.1.bm.a 4 16.f odd 4 1
960.1.bm.a 4 24.f even 2 1
960.1.bm.a 4 40.e odd 2 1
960.1.bm.a 4 48.k even 4 1
960.1.bm.a 4 80.k odd 4 1
960.1.bm.a 4 120.m even 2 1
960.1.bm.a 4 240.t even 4 1
1200.1.r.a 4 40.i odd 4 2
1200.1.r.a 4 80.i odd 4 1
1200.1.r.a 4 80.t odd 4 1
1200.1.r.a 4 120.w even 4 2
1200.1.r.a 4 240.bb even 4 1
1200.1.r.a 4 240.bf even 4 1
1920.1.bm.a 4 1.a even 1 1 trivial
1920.1.bm.a 4 3.b odd 2 1 inner
1920.1.bm.a 4 5.b even 2 1 inner
1920.1.bm.a 4 15.d odd 2 1 CM
1920.1.bm.a 4 16.e even 4 1 inner
1920.1.bm.a 4 48.i odd 4 1 inner
1920.1.bm.a 4 80.q even 4 1 inner
1920.1.bm.a 4 240.bm odd 4 1 inner
1920.1.bm.b 4 4.b odd 2 1
1920.1.bm.b 4 12.b even 2 1
1920.1.bm.b 4 16.f odd 4 1
1920.1.bm.b 4 20.d odd 2 1
1920.1.bm.b 4 48.k even 4 1
1920.1.bm.b 4 60.h even 2 1
1920.1.bm.b 4 80.k odd 4 1
1920.1.bm.b 4 240.t even 4 1

Hecke kernels

This newform subspace can be constructed as the kernel of the linear operator \( T_{19}^{2} - 2T_{19} + 2 \) acting on \(S_{1}^{\mathrm{new}}(1920, [\chi])\). Copy content Toggle raw display

Hecke characteristic polynomials

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