Missing factor of two in simulated noise

[tsunhopang]

In lines 384 and 385 in jim/src/jimgw /detector.py, the variance of the real part or the imaginary part of the noise should have half of the full variance [1].

Therefore, the line should be

noise_real = jax.random.normal(key, shape=freqs.shape) * jnp.sqrt(var / 2.)
noise_imag = jax.random.normal(subkey, shape=freqs.shape) * jnp.sqrt(var / 2.)

[1] https://en.wikipedia.org/wiki/Complex_normal_distribution