Abstract—Nowadays, the spectrum is becoming more and more scarce because of not only the demand increase for wireless services and applications but also inflexible and rigid spectrum allocation policies. A promising solution to overcome this challenge is to exploit spectrum holes for secondary users in cognitive radio. Taking advantage of cognitive radio and dynamic spectrum access improves the...

almost surely has pure point spectrum with exponentially localized eigenfunctions. In d ≥ 2, it is known [FS, vDK, AM] that for 0 < ǫ1 ≪ 1 almost surely the spectrum is pure point with exponentially localized eigenfunctions. This is called Anderson localization (A.L.) By the RAGE theorem [AG, E, R] (cf. also [CFKS]) pure point spectrum is equivalent to the following statement: ∀ initial datum {...

We investigate the possibility to induce double peaks of gravitational wave(GW) spectrum from primordial scalar perturbations in inflationary models with three inflection points.Where points can be generated a polynomial potential or Higgs like $\phi^4$ running quartic coupling.In such models, point at large scales predicts spectral index and tensor-to-scalar ratio consistent current CMB constr...