# Properties

 Label 15.4.a.a Level $15$ Weight $4$ Character orbit 15.a Self dual yes Analytic conductor $0.885$ Analytic rank $0$ Dimension $1$ CM no Inner twists $1$

# Related objects

Show commands: Magma / PariGP / SageMath

## Newspace parameters

comment: Compute space of new eigenforms

[N,k,chi] = [15,4,Mod(1,15)]

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

lf = mfeigenbasis(mf)

from sage.modular.dirichlet import DirichletCharacter

H = DirichletGroup(15, base_ring=CyclotomicField(2))

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

N = Newforms(chi, 4, names="a")

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

chi := DirichletCharacter("15.1");

S:= CuspForms(chi, 4);

N := Newforms(S);

 Level: $$N$$ $$=$$ $$15 = 3 \cdot 5$$ Weight: $$k$$ $$=$$ $$4$$ Character orbit: $$[\chi]$$ $$=$$ 15.a (trivial)

## 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: yes Analytic conductor: $$0.885028650086$$ Analytic rank: $$0$$ Dimension: $$1$$ Coefficient field: $$\mathbb{Q}$$ Coefficient ring: $$\mathbb{Z}$$ Coefficient ring index: $$1$$ Twist minimal: yes Fricke sign: $$+1$$ Sato-Tate group: $\mathrm{SU}(2)$

## $q$-expansion

comment: q-expansion

sage: f.q_expansion() # note that sage often uses an isomorphic number field

gp: mfcoefs(f, 20)

 $$f(q)$$ $$=$$ $$q + q^{2} + 3 q^{3} - 7 q^{4} + 5 q^{5} + 3 q^{6} - 24 q^{7} - 15 q^{8} + 9 q^{9}+O(q^{10})$$ q + q^2 + 3 * q^3 - 7 * q^4 + 5 * q^5 + 3 * q^6 - 24 * q^7 - 15 * q^8 + 9 * q^9 $$q + q^{2} + 3 q^{3} - 7 q^{4} + 5 q^{5} + 3 q^{6} - 24 q^{7} - 15 q^{8} + 9 q^{9} + 5 q^{10} + 52 q^{11} - 21 q^{12} + 22 q^{13} - 24 q^{14} + 15 q^{15} + 41 q^{16} - 14 q^{17} + 9 q^{18} - 20 q^{19} - 35 q^{20} - 72 q^{21} + 52 q^{22} - 168 q^{23} - 45 q^{24} + 25 q^{25} + 22 q^{26} + 27 q^{27} + 168 q^{28} + 230 q^{29} + 15 q^{30} - 288 q^{31} + 161 q^{32} + 156 q^{33} - 14 q^{34} - 120 q^{35} - 63 q^{36} - 34 q^{37} - 20 q^{38} + 66 q^{39} - 75 q^{40} + 122 q^{41} - 72 q^{42} - 188 q^{43} - 364 q^{44} + 45 q^{45} - 168 q^{46} + 256 q^{47} + 123 q^{48} + 233 q^{49} + 25 q^{50} - 42 q^{51} - 154 q^{52} - 338 q^{53} + 27 q^{54} + 260 q^{55} + 360 q^{56} - 60 q^{57} + 230 q^{58} + 100 q^{59} - 105 q^{60} + 742 q^{61} - 288 q^{62} - 216 q^{63} - 167 q^{64} + 110 q^{65} + 156 q^{66} - 84 q^{67} + 98 q^{68} - 504 q^{69} - 120 q^{70} - 328 q^{71} - 135 q^{72} - 38 q^{73} - 34 q^{74} + 75 q^{75} + 140 q^{76} - 1248 q^{77} + 66 q^{78} - 240 q^{79} + 205 q^{80} + 81 q^{81} + 122 q^{82} + 1212 q^{83} + 504 q^{84} - 70 q^{85} - 188 q^{86} + 690 q^{87} - 780 q^{88} + 330 q^{89} + 45 q^{90} - 528 q^{91} + 1176 q^{92} - 864 q^{93} + 256 q^{94} - 100 q^{95} + 483 q^{96} + 866 q^{97} + 233 q^{98} + 468 q^{99}+O(q^{100})$$ q + q^2 + 3 * q^3 - 7 * q^4 + 5 * q^5 + 3 * q^6 - 24 * q^7 - 15 * q^8 + 9 * q^9 + 5 * q^10 + 52 * q^11 - 21 * q^12 + 22 * q^13 - 24 * q^14 + 15 * q^15 + 41 * q^16 - 14 * q^17 + 9 * q^18 - 20 * q^19 - 35 * q^20 - 72 * q^21 + 52 * q^22 - 168 * q^23 - 45 * q^24 + 25 * q^25 + 22 * q^26 + 27 * q^27 + 168 * q^28 + 230 * q^29 + 15 * q^30 - 288 * q^31 + 161 * q^32 + 156 * q^33 - 14 * q^34 - 120 * q^35 - 63 * q^36 - 34 * q^37 - 20 * q^38 + 66 * q^39 - 75 * q^40 + 122 * q^41 - 72 * q^42 - 188 * q^43 - 364 * q^44 + 45 * q^45 - 168 * q^46 + 256 * q^47 + 123 * q^48 + 233 * q^49 + 25 * q^50 - 42 * q^51 - 154 * q^52 - 338 * q^53 + 27 * q^54 + 260 * q^55 + 360 * q^56 - 60 * q^57 + 230 * q^58 + 100 * q^59 - 105 * q^60 + 742 * q^61 - 288 * q^62 - 216 * q^63 - 167 * q^64 + 110 * q^65 + 156 * q^66 - 84 * q^67 + 98 * q^68 - 504 * q^69 - 120 * q^70 - 328 * q^71 - 135 * q^72 - 38 * q^73 - 34 * q^74 + 75 * q^75 + 140 * q^76 - 1248 * q^77 + 66 * q^78 - 240 * q^79 + 205 * q^80 + 81 * q^81 + 122 * q^82 + 1212 * q^83 + 504 * q^84 - 70 * q^85 - 188 * q^86 + 690 * q^87 - 780 * q^88 + 330 * q^89 + 45 * q^90 - 528 * q^91 + 1176 * q^92 - 864 * q^93 + 256 * q^94 - 100 * q^95 + 483 * q^96 + 866 * q^97 + 233 * q^98 + 468 * q^99

## 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   $$\iota_m(\nu)$$ $$a_{2}$$ $$a_{3}$$ $$a_{4}$$ $$a_{5}$$ $$a_{6}$$ $$a_{7}$$ $$a_{8}$$ $$a_{9}$$ $$a_{10}$$
1.1
 0
1.00000 3.00000 −7.00000 5.00000 3.00000 −24.0000 −15.0000 9.00000 5.00000
 $$n$$: e.g. 2-40 or 990-1000 Significant digits: Format: Complex embeddings Normalized embeddings Satake parameters Satake angles

## Atkin-Lehner signs

$$p$$ Sign
$$3$$ $$-1$$
$$5$$ $$-1$$

## Inner twists

This newform does not admit any (nontrivial) inner twists.

## Twists

By twisting character orbit
Char Parity Ord Mult Type Twist Min Dim
1.a even 1 1 trivial 15.4.a.a 1
3.b odd 2 1 45.4.a.c 1
4.b odd 2 1 240.4.a.e 1
5.b even 2 1 75.4.a.b 1
5.c odd 4 2 75.4.b.b 2
7.b odd 2 1 735.4.a.e 1
8.b even 2 1 960.4.a.b 1
8.d odd 2 1 960.4.a.ba 1
9.c even 3 2 405.4.e.g 2
9.d odd 6 2 405.4.e.i 2
11.b odd 2 1 1815.4.a.e 1
12.b even 2 1 720.4.a.n 1
15.d odd 2 1 225.4.a.f 1
15.e even 4 2 225.4.b.e 2
20.d odd 2 1 1200.4.a.t 1
20.e even 4 2 1200.4.f.b 2
21.c even 2 1 2205.4.a.l 1

By twisted newform orbit
Twist Min Dim Char Parity Ord Mult Type
15.4.a.a 1 1.a even 1 1 trivial
45.4.a.c 1 3.b odd 2 1
75.4.a.b 1 5.b even 2 1
75.4.b.b 2 5.c odd 4 2
225.4.a.f 1 15.d odd 2 1
225.4.b.e 2 15.e even 4 2
240.4.a.e 1 4.b odd 2 1
405.4.e.g 2 9.c even 3 2
405.4.e.i 2 9.d odd 6 2
720.4.a.n 1 12.b even 2 1
735.4.a.e 1 7.b odd 2 1
960.4.a.b 1 8.b even 2 1
960.4.a.ba 1 8.d odd 2 1
1200.4.a.t 1 20.d odd 2 1
1200.4.f.b 2 20.e even 4 2
1815.4.a.e 1 11.b odd 2 1
2205.4.a.l 1 21.c even 2 1

## Hecke kernels

This newform subspace can be constructed as the kernel of the linear operator $$T_{2} - 1$$ acting on $$S_{4}^{\mathrm{new}}(\Gamma_0(15))$$.

## Hecke characteristic polynomials

$p$ $F_p(T)$
$2$ $$T - 1$$
$3$ $$T - 3$$
$5$ $$T - 5$$
$7$ $$T + 24$$
$11$ $$T - 52$$
$13$ $$T - 22$$
$17$ $$T + 14$$
$19$ $$T + 20$$
$23$ $$T + 168$$
$29$ $$T - 230$$
$31$ $$T + 288$$
$37$ $$T + 34$$
$41$ $$T - 122$$
$43$ $$T + 188$$
$47$ $$T - 256$$
$53$ $$T + 338$$
$59$ $$T - 100$$
$61$ $$T - 742$$
$67$ $$T + 84$$
$71$ $$T + 328$$
$73$ $$T + 38$$
$79$ $$T + 240$$
$83$ $$T - 1212$$
$89$ $$T - 330$$
$97$ $$T - 866$$