LMFDB - Newform orbit 720.1.bk.a

Show commands: Magma / PariGP / SageMath

Newspace parameters

comment: Compute space of new eigenforms

[N,k,chi] = [720,1,Mod(143,720)]

mf = mfinit([N,k,chi],0)

lf = mfeigenbasis(mf)

from sage.modular.dirichlet import DirichletCharacter

H = DirichletGroup(720, base_ring=CyclotomicField(4))

chi = DirichletCharacter(H, H._module([2, 0, 2, 3]))

N = Newforms(chi, 1, names="a")

//Please install CHIMP (https://github.com/edgarcosta/CHIMP) if you want to run this code

chi := DirichletCharacter("720.143");

S:= CuspForms(chi, 1);

N := Newforms(S);

Level:	$N$	$=$	$720 = 2^{4} \cdot 3^{2} \cdot 5$
Weight:	$k$	$=$	$1$
Character orbit:	$[\chi]$	$=$	720.bk (of order $4$ , degree $2$ , 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:	$0.359326809096$
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:	$x^{4} + 1$ x^4 + 1
Coefficient ring:	$\Z[a_1, \ldots, a_{5}]$
Coefficient ring index:	$1$
Twist minimal:	yes
Projective image:	$D_{4}$
Projective field:	Galois closure of 4.0.13500.1

$q$ -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.

$f(q)$	$=$	$q - \zeta_{8} q^{5} + ( - \zeta_{8}^{2} + 1) q^{13} - 2 \zeta_{8}^{3} q^{17} + \zeta_{8}^{2} q^{25} + (\zeta_{8}^{3} - \zeta_{8}) q^{29} + ( - \zeta_{8}^{2} - 1) q^{37} + (\zeta_{8}^{3} + \zeta_{8}) q^{41} + \cdots + ( - \zeta_{8}^{2} - 1) q^{97} +O(q^{100})$ q - z * q^5 + (-z^2 + 1) * q^13 - 2z^3 q^17 + z^2 * q^25 + (z^3 - z) * q^29 + (-z^2 - 1) * q^37 + (z^3 + z) * q^41 + z^2 * q^49 + 2z q^53 + (z^3 - z) * q^65 + (z^2 - 1) * q^73 - 2 * q^85 + (-z^3 + z) * q^89 + (-z^2 - 1) * q^97
$\operatorname{Tr}(f)(q)$	$=$	$4 q + 4 q^{13} - 4 q^{37} - 4 q^{73} - 8 q^{85} - 4 q^{97}+O(q^{100})$ 4 * q + 4 * q^13 - 4 * q^37 - 4 * q^73 - 8 * q^85 - 4 * q^97

Character values

We give the values of $\chi$ on generators for $\left(\mathbb{Z}/720\mathbb{Z}\right)^\times$ .

$n$	$181$	$271$	$577$	$641$
$\chi(n)$	$1$	$-1$	$\zeta_{8}^{2}$	$-1$

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}

143.1

0.707107	−	0.707107i
−0.707107	+	0.707107i
0.707107	+	0.707107i
−0.707107	−	0.707107i

−0.707107

0.707107i

143.2

0.707107

−

0.707107i

287.1

−0.707107

−

0.707107i

287.2

0.707107

0.707107i

Inner twists

Char	Parity	Ord	Mult	Type
1.a	even	1	1	trivial
4.b	odd	2	1	CM by $\Q(\sqrt{-1})$
3.b	odd	2	1	inner
5.c	odd	4	1	inner
12.b	even	2	1	inner
15.e	even	4	1	inner
20.e	even	4	1	inner
60.l	odd	4	1	inner

Twists

By twisting character orbit
Char	Parity	Ord	Mult	Type	Twist	Min	Dim
1.a	even	1	1	trivial	720.1.bk.a	✓	4
3.b	odd	2	1	inner	720.1.bk.a	✓	4
4.b	odd	2	1	CM	720.1.bk.a	✓	4
5.b	even	2	1		3600.1.bk.a		4
5.c	odd	4	1	inner	720.1.bk.a	✓	4
5.c	odd	4	1		3600.1.bk.a		4
8.b	even	2	1		2880.1.bk.a		4
8.d	odd	2	1		2880.1.bk.a		4
12.b	even	2	1	inner	720.1.bk.a	✓	4
15.d	odd	2	1		3600.1.bk.a		4
15.e	even	4	1	inner	720.1.bk.a	✓	4
15.e	even	4	1		3600.1.bk.a		4
20.d	odd	2	1		3600.1.bk.a		4
20.e	even	4	1	inner	720.1.bk.a	✓	4
20.e	even	4	1		3600.1.bk.a		4
24.f	even	2	1		2880.1.bk.a		4
24.h	odd	2	1		2880.1.bk.a		4
40.i	odd	4	1		2880.1.bk.a		4
40.k	even	4	1		2880.1.bk.a		4
60.h	even	2	1		3600.1.bk.a		4
60.l	odd	4	1	inner	720.1.bk.a	✓	4
60.l	odd	4	1		3600.1.bk.a		4
120.q	odd	4	1		2880.1.bk.a		4
120.w	even	4	1		2880.1.bk.a		4

By twisted newform orbit
Twist	Min	Dim	Char	Parity	Ord	Mult	Type
720.1.bk.a	✓	4	1.a	even	1	1	trivial
720.1.bk.a	✓	4	3.b	odd	2	1	inner
720.1.bk.a	✓	4	4.b	odd	2	1	CM
720.1.bk.a	✓	4	5.c	odd	4	1	inner
720.1.bk.a	✓	4	12.b	even	2	1	inner
720.1.bk.a	✓	4	15.e	even	4	1	inner
720.1.bk.a	✓	4	20.e	even	4	1	inner
720.1.bk.a	✓	4	60.l	odd	4	1	inner
2880.1.bk.a		4	8.b	even	2	1
2880.1.bk.a		4	8.d	odd	2	1
2880.1.bk.a		4	24.f	even	2	1
2880.1.bk.a		4	24.h	odd	2	1
2880.1.bk.a		4	40.i	odd	4	1
2880.1.bk.a		4	40.k	even	4	1
2880.1.bk.a		4	120.q	odd	4	1
2880.1.bk.a		4	120.w	even	4	1
3600.1.bk.a		4	5.b	even	2	1
3600.1.bk.a		4	5.c	odd	4	1
3600.1.bk.a		4	15.d	odd	2	1
3600.1.bk.a		4	15.e	even	4	1
3600.1.bk.a		4	20.d	odd	2	1
3600.1.bk.a		4	20.e	even	4	1
3600.1.bk.a		4	60.h	even	2	1
3600.1.bk.a		4	60.l	odd	4	1

Hecke kernels

This newform subspace is the entire newspace $S_{1}^{\mathrm{new}}(720, [\chi])$ .

Hecke characteristic polynomials

$p$	$F_p(T)$
$2$	$T^{4}$ T^4
$3$	$T^{4}$ T^4
$5$	$T^{4} + 1$ T^4 + 1
$7$	$T^{4}$ T^4
$11$	$T^{4}$ T^4
$13$	$(T^{2} - 2 T + 2)^{2}$ (T^2 - 2*T + 2)^2
$17$	$T^{4} + 16$ T^4 + 16
$19$	$T^{4}$ T^4
$23$	$T^{4}$ T^4
$29$	$(T^{2} - 2)^{2}$ (T^2 - 2)^2
$31$	$T^{4}$ T^4
$37$	$(T^{2} + 2 T + 2)^{2}$ (T^2 + 2*T + 2)^2
$41$	$(T^{2} + 2)^{2}$ (T^2 + 2)^2
$43$	$T^{4}$ T^4
$47$	$T^{4}$ T^4
$53$	$T^{4} + 16$ T^4 + 16
$59$	$T^{4}$ T^4
$61$	$T^{4}$ T^4
$67$	$T^{4}$ T^4
$71$	$T^{4}$ T^4
$73$	$(T^{2} + 2 T + 2)^{2}$ (T^2 + 2*T + 2)^2
$79$	$T^{4}$ T^4
$83$	$T^{4}$ T^4
$89$	$(T^{2} - 2)^{2}$ (T^2 - 2)^2
$97$	$(T^{2} + 2 T + 2)^{2}$ (T^2 + 2*T + 2)^2
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Newspace parameters

Newform invariants

$q$ -expansion

Character values

Embeddings

Inner twists

Twists

Hecke kernels

Hecke characteristic polynomials

This project is supported by grants from the US National Science Foundation, the UK Engineering and Physical Sciences Research Council, and the Simons Foundation.

Label	720.1.bk.a

Level	$720$
Weight	$1$
Character orbit	720.bk
Analytic conductor	$0.359$
Analytic rank	$0$
Dimension	$4$
Projective image	$D_{4}$
CM discriminant	-4
Inner twists	$8$