Atlas › Modular forms › Weight 2 › Level 390 › 390.2.a › 390.2.a.h

Newform orbit 390.2.a.h

Trace form

The 2 newforms in this orbit are conjugate over $\mathbb{Q}$ ; the sum of their $q$ -expansions is

$2q + 2q^{2} + 2q^{3} + 2q^{4} + 2q^{5} + 2q^{6} + 2q^{8} + 2q^{9} + 2q^{10} + 2q^{12} - 2q^{13} + 2q^{15} + 2q^{16} - 4q^{17} + 2q^{18} + 2q^{20} + 2q^{24} + O(q^{25})$

Coefficient field

The coefficients $a_n$ generate $\mathbb{Q}(\sqrt{2})$ . It is generated by the eigenvalue $\alpha$ of $T = T_{7} + 2T_{11} + 3T_{19} + 4T_{23} + 5T_{29} + 6T_{17} + 7T_{31} + 8T_{37}$ , whose minimal polynomial is

$x^{2} + 124x + 316$

Atkin–Lehner signs

$p$	$w_p$
2	$-1$
3	$-1$
5	$-1$
13	$+1$

For $p \parallel N$ every form in the orbit has $a_p = -p^{k/2-1} w_p$ . The Fricke sign is $w_N = -1$ , so the sign of the functional equation is $(-1)^{k/2} w_N = +1$ : each L-function in the orbit has even analytic rank.

Traces of Hecke eigenvalues

$p$	2	3	5	7	11	13	17	19	23	29	31	37	41	43	47	53	59	61	67	71	73	79	83	89	97
$\operatorname{tr} a_p$	2	2	2	0	0	−2	−4	0	0	−12	8	−12	−4	8	−16	4	−16	12	0	0	−12	16	24	−20	−12

$\operatorname{tr} a_n$ for every $n \le 1000$ is in the JSON.

Provenance

Stored in the atlas: computed by Sagebrush's modular symbols engine in 0.444 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 label, dimension and $\operatorname{tr} a_p$ for every $p < 1000$ equal LMFDB's.

The engine's checks

dim M^+ at levels [1, 2, 3, 5, 6, 10, 13, 15, 26, 30, 39, 65, 78, 130, 195, 390]: [0, 1, 1, 1, 3, 3, 1, 4, 5, 10, 6, 8, 18, 24, 32, 92] (certified at ell = 2147483629)
T = [(7, 1), (11, 2), (19, 3), (23, 4), (29, 5), (17, 6), (31, 7), (37, 8)]; h of degree 9 = 1 x 9 (phi(ord eps) x dim S_k^new); 3 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(390, 2)[7]   # 390.2.a.h

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

cargo run --release -p sagebrush-web --example atlas -- 390:2 1000