Evidence of isotropy at large-scale from polarizations of radio sources

We test the isotropy of radio polarization angle orientations with a robust and reliable dual frequency polarimetric survey of active galactic nuclei (AGN). We find that the polarization orientations are consistent with the assumption of isotropy for scales larger than or equal to $\sim 800$ Mpc. This provides further evidence of isotropy at large distance scales and is likely to impose strong constraints on some of the physical mechanisms that may be invoked to explain past observations of alignment of radio and optical polarizations at large distance scales.Comment: 6 pages, 9 figures, accepted for publication in Astronomy & Astrophysics (10/12/2018

Weak Lensing Effect on CMB in the Presence of a Dipole Anisotropy

We investigate weak lensing effect on cosmic microwave background (CMB) in the presence of dipole anisotropy. The approach of flat-sky approximation is considered. We determine the functions $\sigma_0^2$ and $\sigma_2^2$ that appear in expressions of the lensed CMB power spectrum in the presence of a dipole anisotropy. We determine the correction to B-mode power spectrum which is found to be appreciable at low multipoles ($l$). However, the temperature and E-mode power spectrum are not altered significantly.Comment: 9 page

Cloud Computing Security, Privacy Improvements Using Virtualized High Trust Zone

The benefits of cloud computing are clearly well known which include rapid deployment, ease of customization, reduce cost and low risks. However, some high profile security breaches confuse organizations as they attempt to deploy cloud services in their businesses. Although, the cloud service providers pitch the security of their services. Enhancements in existing security measures and advanced solutions are needed to ensure high level security and privacy of data on cloud. This paper provides a holistic overview of cloud security issues by encompassing unique threats in cloud computing and presents findings of a survey of practitioners view on cloud security. A Virtualized High Trust Zone (VHTZ) is then presented as a solution, especially for infrastructure based cloud services to tackle the attacks and network monitoring in a virtualized infrastructure