In string theory, the simultaneous existence of many Axion-Like Particles (ALPs) are suggested over a vast mass range, and variety potentials have been developed in context inflation. such shallower than quadratic, prominent instability can produce localized dense objects, oscillons. Because approximate conservation their adiabatic invariant, oscillons generally survive quite long, maybe up to ...

We explore the possibility that axion-like-particles (ALPs), which would be produced in core of magnetars and then convert magnetosphere into photons, can explain magnetar hard X-ray spectra. remark this scenario also provide answers to some questions related heating. Indeed, considering have: 1) spectra are difficult with known mechanisms; 2) large photon luminosities force high temperatures; ...

A broad class of forces, P, is identified, for which the Abraham-Lorentz-Dirac (ALD) and Newton-like equations have solutions in common. Moreover, these do not present pre-acceleration or escape into infinity (runaway behavior). Any continuous piecewise force can be represented terms functions belonging to this P. It was also argued that set common both sets wider, it proved could formulated ge...