LMFDB - Newform orbit 2856.1.bd.i

Show commands: Magma / Pari/GP / SageMath

Newspace parameters

comment:Compute space of new eigenforms

gp:[N,k,chi] = [2856,1,Mod(1427,2856)] mf = mfinit([N,k,chi],0) lf = mfeigenbasis(mf)

sage:from sage.modular.dirichlet import DirichletCharacter H = DirichletGroup(2856, base_ring=CyclotomicField(2)) chi = DirichletCharacter(H, H._module([1, 1, 1, 1, 1])) N = Newforms(chi, 1, names="a")

magma://Please install CHIMP (https://github.com/edgarcosta/CHIMP) if you want to run this code chi := DirichletCharacter("2856.1427"); S:= CuspForms(chi, 1); N := Newforms(S);

Level:	$ N $	$=$	$ 2856 = 2^{3} \cdot 3 \cdot 7 \cdot 17 $
Weight:	$ k $	$=$	$ 1 $
Character orbit:	$[\chi]$	$=$	2856.bd (of order $2$, degree $1$, minimal)

Newform invariants

comment:select newform

sage:traces = [2,-2,0,2,0,0,0] f = next(g for g in N if [g.coefficient(i+1).trace() for i in range(7)] == traces)

gp:f = lf[1] \\ Warning: the index may be different

Self dual:	no
Analytic conductor:	$1.42532967608$
Analytic rank:	$0$
Dimension:	$2$
Coefficient field:	$\Q(i)$
comment:defining polynomial gp:f.mod \\ as an extension of the character field
Defining polynomial:	$ x^{2} + 1 $ x^2 + 1
Coefficient ring:	$\Z[a_1, a_2, a_3]$
Coefficient ring index:	$ 1 $
Twist minimal:	yes
Projective image:	$D_{2}$
Projective field:	Galois closure of $\Q(\sqrt{-42}, \sqrt{102})$
Artin image:	$D_4:C_2$
Artin field:	Galois closure of 8.0.115507538496.3

$q$-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 - q^{2} - i q^{3} + q^{4} + i q^{6} + i q^{7} - q^{8} - q^{9} - i q^{12} - i q^{14} + q^{16} - i q^{17} + q^{18} + q^{21} + i q^{24} - q^{25} + i q^{27} + i q^{28} - 2 i q^{31} - q^{32} + i q^{34} + \cdots + q^{98} +O(q^{100}) $ q - q^2 - z * q^3 + q^4 + z * q^6 + z * q^7 - q^8 - q^9 - z * q^12 - z * q^14 + q^16 - z * q^17 + q^18 + q^21 + z * q^24 - q^25 + z * q^27 + z * q^28 - 2z q^31 - q^32 + z * q^34 - q^36 - 2z q^41 - q^42 + 2 * q^43 - z * q^48 - q^49 + q^50 - q^51 + 2 * q^53 - z * q^54 - z * q^56 - 2z q^61 + 2z q^62 - z * q^63 + q^64 + 2 * q^67 - z * q^68 + q^72 + z * q^75 + q^81 + 2z q^82 + q^84 - 2 * q^86 - 2 * q^93 + z * q^96 + q^98
$\operatorname{Tr}(f)(q)$	$=$	$ 2 q - 2 q^{2} + 2 q^{4} - 2 q^{8} - 2 q^{9} + 2 q^{16} + 2 q^{18} + 2 q^{21} - 2 q^{25} - 2 q^{32} - 2 q^{36} - 2 q^{42} + 4 q^{43} - 2 q^{49} + 2 q^{50} - 2 q^{51} + 4 q^{53} + 2 q^{64} + 4 q^{67} + 2 q^{72}+ \cdots + 2 q^{98}+O(q^{100}) $ 2 * q - 2 * q^2 + 2 * q^4 - 2 * q^8 - 2 * q^9 + 2 * q^16 + 2 * q^18 + 2 * q^21 - 2 * q^25 - 2 * q^32 - 2 * q^36 - 2 * q^42 + 4 * q^43 - 2 * q^49 + 2 * q^50 - 2 * q^51 + 4 * q^53 + 2 * q^64 + 4 * q^67 + 2 * q^72 + 2 * q^81 + 2 * q^84 - 4 * q^86 - 4 * q^93 + 2 * q^98

Character values

We give the values of $\chi$ on generators for $\left(\mathbb{Z}/2856\mathbb{Z}\right)^\times$.

$n$	$409$	$953$	$1429$	$2143$	$2689$
$\chi(n)$	$-1$	$-1$	$-1$	$-1$	$-1$

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} $

1427.1

		1.00000i
	−	1.00000i

−1.00000

−

1.00000i

1.00000

1.00000i

−1.00000

1427.2

−1.00000

1.00000i

1.00000

−

1.00000i

−

1.00000i

−1.00000

Inner twists

Char	Parity	Ord	Mult	Type
1.a	even	1	1	trivial
119.d	odd	2	1	CM by $\Q(\sqrt{-119}) $
168.e	odd	2	1	CM by $\Q(\sqrt{-42}) $
408.h	even	2	1	RM by $\Q(\sqrt{102}) $
7.b	odd	2	1	inner
17.b	even	2	1	inner
24.f	even	2	1	inner
2856.bd	odd	2	1	inner

Twists

By twisting character orbit
Char	Parity	Ord	Mult	Type	Twist	Min	Dim
1.a	even	1	1	trivial	2856.1.bd.i	✓	2
3.b	odd	2	1		2856.1.bd.j	yes	2
7.b	odd	2	1	inner	2856.1.bd.i	✓	2
8.d	odd	2	1		2856.1.bd.j	yes	2
17.b	even	2	1	inner	2856.1.bd.i	✓	2
21.c	even	2	1		2856.1.bd.j	yes	2
24.f	even	2	1	inner	2856.1.bd.i	✓	2
51.c	odd	2	1		2856.1.bd.j	yes	2
56.e	even	2	1		2856.1.bd.j	yes	2
119.d	odd	2	1	CM	2856.1.bd.i	✓	2
136.e	odd	2	1		2856.1.bd.j	yes	2
168.e	odd	2	1	CM	2856.1.bd.i	✓	2
357.c	even	2	1		2856.1.bd.j	yes	2
408.h	even	2	1	RM	2856.1.bd.i	✓	2
952.k	even	2	1		2856.1.bd.j	yes	2
2856.bd	odd	2	1	inner	2856.1.bd.i	✓	2

By twisted newform orbit
Twist	Min	Dim	Char	Parity	Ord	Mult	Type
2856.1.bd.i	✓	2	1.a	even	1	1	trivial
2856.1.bd.i	✓	2	7.b	odd	2	1	inner
2856.1.bd.i	✓	2	17.b	even	2	1	inner
2856.1.bd.i	✓	2	24.f	even	2	1	inner
2856.1.bd.i	✓	2	119.d	odd	2	1	CM
2856.1.bd.i	✓	2	168.e	odd	2	1	CM
2856.1.bd.i	✓	2	408.h	even	2	1	RM
2856.1.bd.i	✓	2	2856.bd	odd	2	1	inner
2856.1.bd.j	yes	2	3.b	odd	2	1
2856.1.bd.j	yes	2	8.d	odd	2	1
2856.1.bd.j	yes	2	21.c	even	2	1
2856.1.bd.j	yes	2	51.c	odd	2	1
2856.1.bd.j	yes	2	56.e	even	2	1
2856.1.bd.j	yes	2	136.e	odd	2	1
2856.1.bd.j	yes	2	357.c	even	2	1
2856.1.bd.j	yes	2	952.k	even	2	1

Hecke kernels

This newform subspace can be constructed as the intersection of the kernels of the following linear operators acting on $S_{1}^{\mathrm{new}}(2856, [\chi])$:

$ T_{5} $

T5

$ T_{11} $

T11

$ T_{37} $

T37

$ T_{53} - 2 $

T53 - 2

Hecke characteristic polynomials

$p$	$F_p(T)$
$2$	$ (T + 1)^{2} $ (T + 1)^2
$3$	$ T^{2} + 1 $ T^2 + 1
$5$	$ T^{2} $ T^2
$7$	$ T^{2} + 1 $ T^2 + 1
$11$	$ T^{2} $ T^2
$13$	$ T^{2} $ T^2
$17$	$ T^{2} + 1 $ T^2 + 1
$19$	$ T^{2} $ T^2
$23$	$ T^{2} $ T^2
$29$	$ T^{2} $ T^2
$31$	$ T^{2} + 4 $ T^2 + 4
$37$	$ T^{2} $ T^2
$41$	$ T^{2} + 4 $ T^2 + 4
$43$	$ (T - 2)^{2} $ (T - 2)^2
$47$	$ T^{2} $ T^2
$53$	$ (T - 2)^{2} $ (T - 2)^2
$59$	$ T^{2} $ T^2
$61$	$ T^{2} + 4 $ T^2 + 4
$67$	$ (T - 2)^{2} $ (T - 2)^2
$71$	$ T^{2} $ T^2
$73$	$ T^{2} $ T^2
$79$	$ T^{2} $ T^2
$83$	$ T^{2} $ T^2
$89$	$ T^{2} $ T^2
$97$	$ T^{2} $ T^2
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Level:	\( N \)	\(=\)	\( 2856 = 2^{3} \cdot 3 \cdot 7 \cdot 17 \)
Weight:	\( k \)	\(=\)	\( 1 \)
Character orbit:	\([\chi]\)	\(=\)	2856.bd (of order \(2\), degree \(1\), minimal)

\(f(q)\)	\(=\)	\( q - q^{2} - i q^{3} + q^{4} + i q^{6} + i q^{7} - q^{8} - q^{9} - i q^{12} - i q^{14} + q^{16} - i q^{17} + q^{18} + q^{21} + i q^{24} - q^{25} + i q^{27} + i q^{28} - 2 i q^{31} - q^{32} + i q^{34} + \cdots + q^{98} +O(q^{100}) \) q - q^2 - z * q^3 + q^4 + z * q^6 + z * q^7 - q^8 - q^9 - z * q^12 - z * q^14 + q^16 - z * q^17 + q^18 + q^21 + z * q^24 - q^25 + z * q^27 + z * q^28 - 2z q^31 - q^32 + z * q^34 - q^36 - 2z q^41 - q^42 + 2 * q^43 - z * q^48 - q^49 + q^50 - q^51 + 2 * q^53 - z * q^54 - z * q^56 - 2z q^61 + 2z q^62 - z * q^63 + q^64 + 2 * q^67 - z * q^68 + q^72 + z * q^75 + q^81 + 2z q^82 + q^84 - 2 * q^86 - 2 * q^93 + z * q^96 + q^98
\(\operatorname{Tr}(f)(q)\)	\(=\)	\( 2 q - 2 q^{2} + 2 q^{4} - 2 q^{8} - 2 q^{9} + 2 q^{16} + 2 q^{18} + 2 q^{21} - 2 q^{25} - 2 q^{32} - 2 q^{36} - 2 q^{42} + 4 q^{43} - 2 q^{49} + 2 q^{50} - 2 q^{51} + 4 q^{53} + 2 q^{64} + 4 q^{67} + 2 q^{72}+ \cdots + 2 q^{98}+O(q^{100}) \) 2 * q - 2 * q^2 + 2 * q^4 - 2 * q^8 - 2 * q^9 + 2 * q^16 + 2 * q^18 + 2 * q^21 - 2 * q^25 - 2 * q^32 - 2 * q^36 - 2 * q^42 + 4 * q^43 - 2 * q^49 + 2 * q^50 - 2 * q^51 + 4 * q^53 + 2 * q^64 + 4 * q^67 + 2 * q^72 + 2 * q^81 + 2 * q^84 - 4 * q^86 - 4 * q^93 + 2 * q^98

Introduction

L-functions

Modular forms

Varieties

Fields

Representations

Groups

Database

Properties

Related objects

Downloads

Learn more

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	2856.1.bd.i

Level	$2856$
Weight	$1$
Character orbit	2856.bd
Analytic conductor	$1.425$
Analytic rank	$0$
Dimension	$2$
Projective image	$D_{2}$
CM/RM discs	-119, -168, 408
Inner twists	$8$

Self dual:	no
Analytic conductor:	\(1.42532967608\)
Analytic rank:	\(0\)
Dimension:	\(2\)
Coefficient field:	\(\Q(i)\)
comment:defining polynomial gp:f.mod \\ as an extension of the character field
Defining polynomial:	\( x^{2} + 1 \) x^2 + 1
Coefficient ring:	\(\Z[a_1, a_2, a_3]\)
Coefficient ring index:	\( 1 \)
Twist minimal:	yes
Projective image:	\(D_{2}\)
Projective field:	Galois closure of \(\Q(\sqrt{-42}, \sqrt{102})\)
Artin image:	$D_4:C_2$
Artin field:	Galois closure of 8.0.115507538496.3

\(n\)	\(409\)	\(953\)	\(1429\)	\(2143\)	\(2689\)
\(\chi(n)\)	\(-1\)	\(-1\)	\(-1\)	\(-1\)	\(-1\)

$p$	$F_p(T)$
$2$	\( (T + 1)^{2} \) (T + 1)^2
$3$	\( T^{2} + 1 \) T^2 + 1
$5$	\( T^{2} \) T^2
$7$	\( T^{2} + 1 \) T^2 + 1
$11$	\( T^{2} \) T^2
$13$	\( T^{2} \) T^2
$17$	\( T^{2} + 1 \) T^2 + 1
$19$	\( T^{2} \) T^2
$23$	\( T^{2} \) T^2
$29$	\( T^{2} \) T^2
$31$	\( T^{2} + 4 \) T^2 + 4
$37$	\( T^{2} \) T^2
$41$	\( T^{2} + 4 \) T^2 + 4
$43$	\( (T - 2)^{2} \) (T - 2)^2
$47$	\( T^{2} \) T^2
$53$	\( (T - 2)^{2} \) (T - 2)^2
$59$	\( T^{2} \) T^2
$61$	\( T^{2} + 4 \) T^2 + 4
$67$	\( (T - 2)^{2} \) (T - 2)^2
$71$	\( T^{2} \) T^2
$73$	\( T^{2} \) T^2
$79$	\( T^{2} \) T^2
$83$	\( T^{2} \) T^2
$89$	\( T^{2} \) T^2
$97$	\( T^{2} \) T^2
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\(n\):		e.g. 2-40 or 990-1000
Significant digits:
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