LMFDB - Newform orbit 2448.2.bg.b

Show commands: Magma / PariGP / SageMath

Newspace parameters

comment: Compute space of new eigenforms

[N,k,chi] = [2448,2,Mod(863,2448)]

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

lf = mfeigenbasis(mf)

from sage.modular.dirichlet import DirichletCharacter

H = DirichletGroup(2448, base_ring=CyclotomicField(4))

chi = DirichletCharacter(H, H._module([2, 0, 2, 1]))

N = Newforms(chi, 2, names="a")

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

chi := DirichletCharacter("2448.863");

S:= CuspForms(chi, 2);

N := Newforms(S);

Level:	$ N $	$=$	$ 2448 = 2^{4} \cdot 3^{2} \cdot 17 $
Weight:	$ k $	$=$	$ 2 $
Character orbit:	$[\chi]$	$=$	2448.bg (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:	$19.5473784148$
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:	$\Z[a_1, \ldots, a_{17}]$
Coefficient ring index:	$ 1 $
Twist minimal:	yes
Sato-Tate group:	$\mathrm{U}(1)[D_{4}]$

$q$-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 primitive root of unity $\zeta_{8}$. We also show the integral $q$-expansion of the trace form.

$f(q)$	$=$	$ q + 2 \zeta_{8} q^{5}+O(q^{10}) $ q + 2z q^5	$ q + 2 \zeta_{8} q^{5} + 6 q^{13} + ( - 4 \zeta_{8}^{3} + \zeta_{8}) q^{17} - \zeta_{8}^{2} q^{25} - 4 \zeta_{8} q^{29} + ( - 5 \zeta_{8}^{2} + 5) q^{37} + 8 \zeta_{8}^{3} q^{41} + 7 \zeta_{8}^{2} q^{49} + ( - 5 \zeta_{8}^{3} + 5 \zeta_{8}) q^{53} + ( - \zeta_{8}^{2} - 1) q^{61} + 12 \zeta_{8} q^{65} + ( - 11 \zeta_{8}^{2} + 11) q^{73} + (2 \zeta_{8}^{2} + 8) q^{85} + (13 \zeta_{8}^{3} + 13 \zeta_{8}) q^{89} + ( - 13 \zeta_{8}^{2} + 13) q^{97} +O(q^{100}) $ q + 2z q^5 + 6 * q^13 + (-4z^3 + z) q^17 - z^2 * q^25 - 4z q^29 + (-5z^2 + 5) q^37 + 8z^3 q^41 + 7z^2 q^49 + (-5z^3 + 5z) * q^53 + (-z^2 - 1) * q^61 + 12z q^65 + (-11z^2 + 11) q^73 + (2z^2 + 8) q^85 + (13z^3 + 13z) * q^89 + (-13z^2 + 13) q^97
$\operatorname{Tr}(f)(q)$	$=$	$ 4 q+O(q^{10}) $ 4 * q	$ 4 q + 24 q^{13} + 20 q^{37} - 4 q^{61} + 44 q^{73} + 32 q^{85} + 52 q^{97}+O(q^{100}) $ 4 * q + 24 * q^13 + 20 * q^37 - 4 * q^61 + 44 * q^73 + 32 * q^85 + 52 * q^97

Display 100 coefficients 10 coefficients

Character values

We give the values of $\chi$ on generators for $\left(\mathbb{Z}/2448\mathbb{Z}\right)^\times$.

$n$	$613$	$1361$	$1873$	$2143$
$\chi(n)$	$1$	$-1$	$-\zeta_{8}^{2}$	$-1$

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} $

863.1

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

−1.41421

1.41421i

863.2

1.41421

−

1.41421i

1007.1

−1.41421

−

1.41421i

1007.2

1.41421

1.41421i

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
12.b	even	2	1	inner
17.c	even	4	1	inner
51.f	odd	4	1	inner
68.f	odd	4	1	inner
204.l	even	4	1	inner

Twists

By twisting character orbit
Char	Parity	Ord	Mult	Type	Twist	Min	Dim
1.a	even	1	1	trivial	2448.2.bg.b	✓	4
3.b	odd	2	1	inner	2448.2.bg.b	✓	4
4.b	odd	2	1	CM	2448.2.bg.b	✓	4
12.b	even	2	1	inner	2448.2.bg.b	✓	4
17.c	even	4	1	inner	2448.2.bg.b	✓	4
51.f	odd	4	1	inner	2448.2.bg.b	✓	4
68.f	odd	4	1	inner	2448.2.bg.b	✓	4
204.l	even	4	1	inner	2448.2.bg.b	✓	4

By twisted newform orbit
Twist	Min	Dim	Char	Parity	Ord	Mult	Type
2448.2.bg.b	✓	4	1.a	even	1	1	trivial
2448.2.bg.b	✓	4	3.b	odd	2	1	inner
2448.2.bg.b	✓	4	4.b	odd	2	1	CM
2448.2.bg.b	✓	4	12.b	even	2	1	inner
2448.2.bg.b	✓	4	17.c	even	4	1	inner
2448.2.bg.b	✓	4	51.f	odd	4	1	inner
2448.2.bg.b	✓	4	68.f	odd	4	1	inner
2448.2.bg.b	✓	4	204.l	even	4	1	inner

Hecke kernels

This newform subspace can be constructed as the intersection of the kernels of the following linear operators acting on $S_{2}^{\mathrm{new}}(2448, [\chi])$:

$ T_{5}^{4} + 16 $

$ T_{7} $

Hecke characteristic polynomials

$p$	$F_p(T)$
$2$	$ T^{4} $ T^4
$3$	$ T^{4} $ T^4
$5$	$ T^{4} + 16 $ T^4 + 16
$7$	$ T^{4} $ T^4
$11$	$ T^{4} $ T^4
$13$	$ (T - 6)^{4} $ (T - 6)^4
$17$	$ T^{4} - 16T^{2} + 289 $ T^4 - 16*T^2 + 289
$19$	$ T^{4} $ T^4
$23$	$ T^{4} $ T^4
$29$	$ T^{4} + 256 $ T^4 + 256
$31$	$ T^{4} $ T^4
$37$	$ (T^{2} - 10 T + 50)^{2} $ (T^2 - 10*T + 50)^2
$41$	$ T^{4} + 4096 $ T^4 + 4096
$43$	$ T^{4} $ T^4
$47$	$ T^{4} $ T^4
$53$	$ (T^{2} - 50)^{2} $ (T^2 - 50)^2
$59$	$ T^{4} $ T^4
$61$	$ (T^{2} + 2 T + 2)^{2} $ (T^2 + 2*T + 2)^2
$67$	$ T^{4} $ T^4
$71$	$ T^{4} $ T^4
$73$	$ (T^{2} - 22 T + 242)^{2} $ (T^2 - 22*T + 242)^2
$79$	$ T^{4} $ T^4
$83$	$ T^{4} $ T^4
$89$	$ (T^{2} + 338)^{2} $ (T^2 + 338)^2
$97$	$ (T^{2} - 26 T + 338)^{2} $ (T^2 - 26*T + 338)^2
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Elliptic curves over $\Q$
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Higher genus families
Abelian varieties over $\F_{q}$

Level:	\( N \)	\(=\)	\( 2448 = 2^{4} \cdot 3^{2} \cdot 17 \)
Weight:	\( k \)	\(=\)	\( 2 \)
Character orbit:	\([\chi]\)	\(=\)	2448.bg (of order \(4\), degree \(2\), minimal)

\(f(q)\)	\(=\)	\( q + 2 \zeta_{8} q^{5}+O(q^{10}) \) q + 2z q^5	\( q + 2 \zeta_{8} q^{5} + 6 q^{13} + ( - 4 \zeta_{8}^{3} + \zeta_{8}) q^{17} - \zeta_{8}^{2} q^{25} - 4 \zeta_{8} q^{29} + ( - 5 \zeta_{8}^{2} + 5) q^{37} + 8 \zeta_{8}^{3} q^{41} + 7 \zeta_{8}^{2} q^{49} + ( - 5 \zeta_{8}^{3} + 5 \zeta_{8}) q^{53} + ( - \zeta_{8}^{2} - 1) q^{61} + 12 \zeta_{8} q^{65} + ( - 11 \zeta_{8}^{2} + 11) q^{73} + (2 \zeta_{8}^{2} + 8) q^{85} + (13 \zeta_{8}^{3} + 13 \zeta_{8}) q^{89} + ( - 13 \zeta_{8}^{2} + 13) q^{97} +O(q^{100}) \) q + 2z q^5 + 6 * q^13 + (-4z^3 + z) q^17 - z^2 * q^25 - 4z q^29 + (-5z^2 + 5) q^37 + 8z^3 q^41 + 7z^2 q^49 + (-5z^3 + 5z) * q^53 + (-z^2 - 1) * q^61 + 12z q^65 + (-11z^2 + 11) q^73 + (2z^2 + 8) q^85 + (13z^3 + 13z) * q^89 + (-13z^2 + 13) q^97
\(\operatorname{Tr}(f)(q)\)	\(=\)	\( 4 q+O(q^{10}) \) 4 * q	\( 4 q + 24 q^{13} + 20 q^{37} - 4 q^{61} + 44 q^{73} + 32 q^{85} + 52 q^{97}+O(q^{100}) \) 4 * q + 24 * q^13 + 20 * q^37 - 4 * q^61 + 44 * q^73 + 32 * q^85 + 52 * q^97

Introduction

L-functions

Modular forms

Varieties

Fields

Representations

Groups

Database

Properties

Related objects

Downloads

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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	2448.2.bg.b

Level	$2448$
Weight	$2$
Character orbit	2448.bg
Analytic conductor	$19.547$
Analytic rank	$0$
Dimension	$4$
CM discriminant	-4
Inner twists	$8$

Self dual:	no
Analytic conductor:	\(19.5473784148\)
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:	\(\Z[a_1, \ldots, a_{17}]\)
Coefficient ring index:	\( 1 \)
Twist minimal:	yes
Sato-Tate group:	$\mathrm{U}(1)[D_{4}]$

\(n\)	\(613\)	\(1361\)	\(1873\)	\(2143\)
\(\chi(n)\)	\(1\)	\(-1\)	\(-\zeta_{8}^{2}\)	\(-1\)

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
12.b	even	2	1	inner
17.c	even	4	1	inner
51.f	odd	4	1	inner
68.f	odd	4	1	inner
204.l	even	4	1	inner

$p$	$F_p(T)$
$2$	\( T^{4} \) T^4
$3$	\( T^{4} \) T^4
$5$	\( T^{4} + 16 \) T^4 + 16
$7$	\( T^{4} \) T^4
$11$	\( T^{4} \) T^4
$13$	\( (T - 6)^{4} \) (T - 6)^4
$17$	\( T^{4} - 16T^{2} + 289 \) T^4 - 16*T^2 + 289
$19$	\( T^{4} \) T^4
$23$	\( T^{4} \) T^4
$29$	\( T^{4} + 256 \) T^4 + 256
$31$	\( T^{4} \) T^4
$37$	\( (T^{2} - 10 T + 50)^{2} \) (T^2 - 10*T + 50)^2
$41$	\( T^{4} + 4096 \) T^4 + 4096
$43$	\( T^{4} \) T^4
$47$	\( T^{4} \) T^4
$53$	\( (T^{2} - 50)^{2} \) (T^2 - 50)^2
$59$	\( T^{4} \) T^4
$61$	\( (T^{2} + 2 T + 2)^{2} \) (T^2 + 2*T + 2)^2
$67$	\( T^{4} \) T^4
$71$	\( T^{4} \) T^4
$73$	\( (T^{2} - 22 T + 242)^{2} \) (T^2 - 22*T + 242)^2
$79$	\( T^{4} \) T^4
$83$	\( T^{4} \) T^4
$89$	\( (T^{2} + 338)^{2} \) (T^2 + 338)^2
$97$	\( (T^{2} - 26 T + 338)^{2} \) (T^2 - 26*T + 338)^2
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