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Analysis of Null Related Beampattern Measures and Signal Quantization Effects for Linear Differential Microphone Arrays
Shweta Pal, Arun Kumar, Monika Agrawal
https://arxiv.org/abs/2506.21043

Analysis of Null Related Beampattern Measures and Signal Quantization Effects for Linear Differential Microphone Arrays
A differential microphone array (DMA) offers enhanced capabilities to obtain sharp nulls at the cost of relatively broad peaks in the beam power pattern. This can be used for applications that require nullification or attenuation of interfering sources. To the best of our knowledge, the existing literature lacks measures that directly assess the efficacy of nulls, and null-related measures have not been investigated in the context of differential microphone arrays (DMAs). This paper offers new …

Probing the Scotogenic Dirac Model with FIMP Dark Matter and $\Delta N_{\rm eff}$
Shu-Yuan Guo, Man-Yu Zhao
https://arxiv.org/abs/2508.16362 https://arxiv.…

Probing the Scotogenic Dirac Model with FIMP Dark Matter and $ΔN_{\rm eff}$
We study a feebly interacting massive particle realization of the Scotogenic Dirac Model in which the lightest neutral fermion $N_1$ serves as a dark matter candidate, produced via the freeze-in or super-WIMP mechanism. The model generates Dirac neutrino masses at one loop, resulting in a rank-2 mass matrix that predicts one nearly massless neutrino. We analyze the DM relic density for various next-to-lightest odd particles (NLOPs), finding that coannihilation effects and enhanced annihilation …