We analyze the constraints on four-derivative corrections to 5d Einstein-Maxwell theory from black hole Weak Gravity Conjecture (WGC). calculate leading extremal mass of asymptotically flat charged solutions as well 4d Kaluza-Klein compactifications. The WGC bounds latter, interpreted dyonic holes, are found be strictly stronger. As magnetic graviphoton charge lifts a NUT-like in 5d, we argue t...

This paper considers a new switched reluctance motor (SRM) structure aiming at high starting torque with low volume. For some applications such as EVs (Electrical Vehicles), the motor volume and starting torque is a critical point in its design. In many methods, reducing the motor volume causes reduction in starting torque and decreases the motor efficiency. Unlike conventional SRMs, the rotor ...

The evolution of multiple scalar fields in cosmology has been much studied, particularly when the potential is formed from a series of exponentials. For a certain subclass of such systems it is possible to get “assisted“ behaviour, where the presence of multiple terms in the potential effectively makes it shallower than the individual terms indicate. It is also known that when compactifying on ...