A high-current, wide-band transconductance amplifier is described that provides an unprecedented level of output current at high frequencies with exceptional stability. It is capable of converting a signal voltage applied to its input into a groundreferenced output rms current up to 100 A over a frequency range from dc to 100 kHz with a useable frequency extending to 1 MHz. The amplifier has a ...

We compute the cosmological boost factor at high redshifts of $z=10$-$100$ by integrating non-linear matter power spectrum measured from high-resolution $N$-body simulations. An accurate is required to estimate energy injection dark annihilation, which may affect re-ionization process. combined various box-size simulations (side lengths $1 \, {\rm kpc}$-$10 Mpc}$) cover a wide range scales, i.e...