Atlas › Modular forms › Weight 4 › Level 62 › 62.4.a

Newspace 62.4.a: $S_{4}^{\mathrm{new}}(\Gamma_0(62))$

Newforms

Label	Dim	Coefficient field	Trace form	AL signs	Sign
62.4.a.a	1	$\mathbb{Q}$	$q - 2q^{2} - 2q^{3} + 4q^{4} + q^{5} + 4q^{6} - 11q^{7} + O(q^{8})$	+ −	$-1$
62.4.a.b	1	$\mathbb{Q}$	$q + 2q^{2} - 8q^{3} + 4q^{4} - 3q^{5} - 16q^{6} - 35q^{7} + O(q^{8})$	− +	$-1$
62.4.a.c	3	degree 3	$3q - 6q^{2} + 4q^{3} + 12q^{4} + q^{5} - 8q^{6} + 17q^{7} + O(q^{8})$	+ +	$+1$
62.4.a.d	3	degree 3	$3q + 6q^{2} + 4q^{3} + 12q^{4} + 17q^{5} + 8q^{6} + 21q^{7} + O(q^{8})$	− −	$+1$

Hecke characteristic polynomials

The eigenvalue of $T = T_{3} + T_{5}$ generates each orbit's coefficient field; on the newspace its characteristic polynomial factors over $\mathbb{Q}$ as one irreducible factor per orbit:

Orbit	Characteristic polynomial of $T$
62.4.a.a	$x + 1$
62.4.a.b	$x + 11$
62.4.a.c	$x^{3} - 5x^{2} - 516x + 1288$
62.4.a.d	$x^{3} - 21x^{2} + 96x - 94$

Dimensions

Newforms $S_{4}^{\mathrm{new}}(\Gamma_0(62))$	8
Old forms	14
Cusp forms $S_{4}(\Gamma_0(62))$	22
Eisenstein series $E_{4}(\Gamma_0(62))$	4
Modular forms $M_{4}(\Gamma_0(62))$	26

Decomposition of the old subspace

$S_{4}^{\mathrm{old}}(\Gamma_0(62)) =$ $S_{4}^{\mathrm{new}}(\Gamma_0(31))^{\oplus 2}$

Provenance

Stored in the atlas: computed by Sagebrush's modular symbols engine in 0.101 s (one thread) and proven: the dimensions are certified, and the characteristic polynomial of $T$ over $\mathbb{Z}$ is reconstructed by CRT past a rigorous coefficient bound.

The engine's checks

dim M^+ at levels [1, 2, 31, 62]: [1, 2, 9, 26] (certified at ell = 2147482951)
T = [(3, 1), (5, 1)]; h of degree 8 = 1 x 8 (phi(ord eps) x dim S_k^new); 2 primes, 0 rejected

Open in the notebook · JSON · stored data

Recompute it yourself

In Sage mode at sagebrush.space (or npx sagebrush --sage):

newform_orbits(62, 4)

With the Rust engine (source), in engine/:

cargo run --release -p sagebrush-web --example atlas -- 62:4 1000

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