Properties

Label 360.2.d.a
Level $360$
Weight $2$
Character orbit 360.d
Analytic conductor $2.875$
Analytic rank $0$
Dimension $4$
CM discriminant -120
Inner twists $8$

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Show commands: Magma / PariGP / SageMath

Newspace parameters

comment: Compute space of new eigenforms
 
[N,k,chi] = [360,2,Mod(109,360)]
 
mf = mfinit([N,k,chi],0)
 
lf = mfeigenbasis(mf)
 
from sage.modular.dirichlet import DirichletCharacter
 
H = DirichletGroup(360, base_ring=CyclotomicField(2))
 
chi = DirichletCharacter(H, H._module([0, 1, 0, 1]))
 
N = Newforms(chi, 2, names="a")
 
//Please install CHIMP (https://github.com/edgarcosta/CHIMP) if you want to run this code
 
chi := DirichletCharacter("360.109");
 
S:= CuspForms(chi, 2);
 
N := Newforms(S);
 
Level: \( N \) \(=\) \( 360 = 2^{3} \cdot 3^{2} \cdot 5 \)
Weight: \( k \) \(=\) \( 2 \)
Character orbit: \([\chi]\) \(=\) 360.d (of order \(2\), degree \(1\), 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: \(2.87461447277\)
Analytic rank: \(0\)
Dimension: \(4\)
Coefficient field: \(\Q(\sqrt{-2}, \sqrt{-5})\)
comment: defining polynomial
 
gp: f.mod \\ as an extension of the character field
 
Defining polynomial: \( x^{4} - 4x^{2} + 9 \) Copy content Toggle raw display
Coefficient ring: \(\Z[a_1, \ldots, a_{5}]\)
Coefficient ring index: \( 2 \)
Twist minimal: yes
Sato-Tate group: $\mathrm{U}(1)[D_{2}]$

$q$-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.

\(f(q)\) \(=\) \( q - \beta_1 q^{2} - 2 q^{4} + \beta_{2} q^{5} + 2 \beta_1 q^{8}+O(q^{10}) \) Copy content Toggle raw display \( q - \beta_1 q^{2} - 2 q^{4} + \beta_{2} q^{5} + 2 \beta_1 q^{8} + \beta_{3} q^{10} + 2 \beta_{2} q^{11} + 2 \beta_{3} q^{13} + 4 q^{16} - 2 \beta_1 q^{17} - 2 \beta_{2} q^{20} + 2 \beta_{3} q^{22} + 4 \beta_1 q^{23} - 5 q^{25} - 4 \beta_{2} q^{26} + 2 \beta_{2} q^{29} + 2 q^{31} - 4 \beta_1 q^{32} - 4 q^{34} + 2 \beta_{3} q^{37} - 2 \beta_{3} q^{40} - 4 \beta_{3} q^{43} - 4 \beta_{2} q^{44} + 8 q^{46} - 8 \beta_1 q^{47} + 7 q^{49} + 5 \beta_1 q^{50} - 4 \beta_{3} q^{52} - 10 q^{55} + 2 \beta_{3} q^{58} + 2 \beta_{2} q^{59} - 2 \beta_1 q^{62} - 8 q^{64} + 10 \beta_1 q^{65} - 4 \beta_{3} q^{67} + 4 \beta_1 q^{68} - 4 \beta_{2} q^{74} + 14 q^{79} + 4 \beta_{2} q^{80} + 2 \beta_{3} q^{85} + 8 \beta_{2} q^{86} - 4 \beta_{3} q^{88} - 8 \beta_1 q^{92} - 16 q^{94} - 7 \beta_1 q^{98}+O(q^{100}) \) Copy content Toggle raw display
\(\operatorname{Tr}(f)(q)\) \(=\) \( 4 q - 8 q^{4}+O(q^{10}) \) Copy content Toggle raw display \( 4 q - 8 q^{4} + 16 q^{16} - 20 q^{25} + 8 q^{31} - 16 q^{34} + 32 q^{46} + 28 q^{49} - 40 q^{55} - 32 q^{64} + 56 q^{79} - 64 q^{94}+O(q^{100}) \) Copy content Toggle raw display

Basis of coefficient ring in terms of a root \(\nu\) of \( x^{4} - 4x^{2} + 9 \) : Copy content Toggle raw display

\(\beta_{1}\)\(=\) \( ( \nu^{3} - \nu ) / 3 \) Copy content Toggle raw display
\(\beta_{2}\)\(=\) \( \nu^{2} - 2 \) Copy content Toggle raw display
\(\beta_{3}\)\(=\) \( ( -\nu^{3} + 7\nu ) / 3 \) Copy content Toggle raw display
\(\nu\)\(=\) \( ( \beta_{3} + \beta_1 ) / 2 \) Copy content Toggle raw display
\(\nu^{2}\)\(=\) \( \beta_{2} + 2 \) Copy content Toggle raw display
\(\nu^{3}\)\(=\) \( ( \beta_{3} + 7\beta_1 ) / 2 \) Copy content Toggle raw display

Character values

We give the values of \(\chi\) on generators for \(\left(\mathbb{Z}/360\mathbb{Z}\right)^\times\).

\(n\) \(181\) \(217\) \(271\) \(281\)
\(\chi(n)\) \(-1\) \(-1\) \(1\) \(1\)

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   \(\iota_m(\nu)\) \( a_{2} \) \( a_{3} \) \( a_{4} \) \( a_{5} \) \( a_{6} \) \( a_{7} \) \( a_{8} \) \( a_{9} \) \( a_{10} \)
109.1
−1.58114 + 0.707107i
1.58114 + 0.707107i
1.58114 0.707107i
−1.58114 0.707107i
1.41421i 0 −2.00000 2.23607i 0 0 2.82843i 0 −3.16228
109.2 1.41421i 0 −2.00000 2.23607i 0 0 2.82843i 0 3.16228
109.3 1.41421i 0 −2.00000 2.23607i 0 0 2.82843i 0 3.16228
109.4 1.41421i 0 −2.00000 2.23607i 0 0 2.82843i 0 −3.16228
\(n\): e.g. 2-40 or 990-1000
Significant digits:
Format:

Inner twists

Char Parity Ord Mult Type
1.a even 1 1 trivial
120.i odd 2 1 CM by \(\Q(\sqrt{-30}) \)
3.b odd 2 1 inner
5.b even 2 1 inner
8.b even 2 1 inner
15.d odd 2 1 inner
24.h odd 2 1 inner
40.f even 2 1 inner

Twists

       By twisting character orbit
Char Parity Ord Mult Type Twist Min Dim
1.a even 1 1 trivial 360.2.d.a 4
3.b odd 2 1 inner 360.2.d.a 4
4.b odd 2 1 1440.2.d.a 4
5.b even 2 1 inner 360.2.d.a 4
5.c odd 4 2 1800.2.k.o 4
8.b even 2 1 inner 360.2.d.a 4
8.d odd 2 1 1440.2.d.a 4
12.b even 2 1 1440.2.d.a 4
15.d odd 2 1 inner 360.2.d.a 4
15.e even 4 2 1800.2.k.o 4
20.d odd 2 1 1440.2.d.a 4
20.e even 4 2 7200.2.k.m 4
24.f even 2 1 1440.2.d.a 4
24.h odd 2 1 inner 360.2.d.a 4
40.e odd 2 1 1440.2.d.a 4
40.f even 2 1 inner 360.2.d.a 4
40.i odd 4 2 1800.2.k.o 4
40.k even 4 2 7200.2.k.m 4
60.h even 2 1 1440.2.d.a 4
60.l odd 4 2 7200.2.k.m 4
120.i odd 2 1 CM 360.2.d.a 4
120.m even 2 1 1440.2.d.a 4
120.q odd 4 2 7200.2.k.m 4
120.w even 4 2 1800.2.k.o 4
    
        By twisted newform orbit
Twist Min Dim Char Parity Ord Mult Type
360.2.d.a 4 1.a even 1 1 trivial
360.2.d.a 4 3.b odd 2 1 inner
360.2.d.a 4 5.b even 2 1 inner
360.2.d.a 4 8.b even 2 1 inner
360.2.d.a 4 15.d odd 2 1 inner
360.2.d.a 4 24.h odd 2 1 inner
360.2.d.a 4 40.f even 2 1 inner
360.2.d.a 4 120.i odd 2 1 CM
1440.2.d.a 4 4.b odd 2 1
1440.2.d.a 4 8.d odd 2 1
1440.2.d.a 4 12.b even 2 1
1440.2.d.a 4 20.d odd 2 1
1440.2.d.a 4 24.f even 2 1
1440.2.d.a 4 40.e odd 2 1
1440.2.d.a 4 60.h even 2 1
1440.2.d.a 4 120.m even 2 1
1800.2.k.o 4 5.c odd 4 2
1800.2.k.o 4 15.e even 4 2
1800.2.k.o 4 40.i odd 4 2
1800.2.k.o 4 120.w even 4 2
7200.2.k.m 4 20.e even 4 2
7200.2.k.m 4 40.k even 4 2
7200.2.k.m 4 60.l odd 4 2
7200.2.k.m 4 120.q odd 4 2

Hecke kernels

This newform subspace can be constructed as the intersection of the kernels of the following linear operators acting on \(S_{2}^{\mathrm{new}}(360, [\chi])\):

\( T_{7} \) Copy content Toggle raw display
\( T_{11}^{2} + 20 \) Copy content Toggle raw display
\( T_{13}^{2} - 40 \) Copy content Toggle raw display

Hecke characteristic polynomials

$p$ $F_p(T)$
$2$ \( (T^{2} + 2)^{2} \) Copy content Toggle raw display
$3$ \( T^{4} \) Copy content Toggle raw display
$5$ \( (T^{2} + 5)^{2} \) Copy content Toggle raw display
$7$ \( T^{4} \) Copy content Toggle raw display
$11$ \( (T^{2} + 20)^{2} \) Copy content Toggle raw display
$13$ \( (T^{2} - 40)^{2} \) Copy content Toggle raw display
$17$ \( (T^{2} + 8)^{2} \) Copy content Toggle raw display
$19$ \( T^{4} \) Copy content Toggle raw display
$23$ \( (T^{2} + 32)^{2} \) Copy content Toggle raw display
$29$ \( (T^{2} + 20)^{2} \) Copy content Toggle raw display
$31$ \( (T - 2)^{4} \) Copy content Toggle raw display
$37$ \( (T^{2} - 40)^{2} \) Copy content Toggle raw display
$41$ \( T^{4} \) Copy content Toggle raw display
$43$ \( (T^{2} - 160)^{2} \) Copy content Toggle raw display
$47$ \( (T^{2} + 128)^{2} \) Copy content Toggle raw display
$53$ \( T^{4} \) Copy content Toggle raw display
$59$ \( (T^{2} + 20)^{2} \) Copy content Toggle raw display
$61$ \( T^{4} \) Copy content Toggle raw display
$67$ \( (T^{2} - 160)^{2} \) Copy content Toggle raw display
$71$ \( T^{4} \) Copy content Toggle raw display
$73$ \( T^{4} \) Copy content Toggle raw display
$79$ \( (T - 14)^{4} \) 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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