On the Detectability of CMB Anisotropies Induced by de Sitter-G\"odel-de Sitter Phase Transition

A geometrical phase transition in the very early Universe, from de Sitter to G\"odel and back to de Sitter (dGd) spacetimes, can explain the universal phenomenon of rotation of many large scale structures. This phase transition is shown to induce fluctuations on the matter and radiation fields with possibly observable traces. In this work we simulate the dGd-induced inhomogeneities and use their power spectrum, parametrized by the parameter pair ($p_1, p_2$), as possible seeds of CMB anisotropies along with the standard inflationary perturbations. With the Planck 2018 observations, we find $p_1=0.008^{+0.003}_{-0.008}$ and $p_2= 0.002^{+0.001}_{-0.002}$ consistent with pure inflationary power spectrum and no hint for the dGd transition. Future large scale surveys can further tighten the constraints and probe the physics of the early Universe

Massive Spinors and dS/CFT Correspondence

Using the map between free massless spinors on d+1 dimensional Minkowski spacetime and free massive spinors on $dS_{d+1}$, we obtain the boundary term that should be added to the standard Dirac action for spinors in the dS/CFT correspondence. It is shown that this map can be extended only to theories with vertex ({\bar\p}\p)^2 but arbitrary $d\ge1$. In the case of scalar field theories such an extension can be made only for $d=2,3,5$ with vertices $\phi^6$, $\phi^4$ and $\phi^3$ respectively

Coexistence of OFDM and FBMC for Underlay D2D Communication in 5G Networks

Device-to-device (D2D) communication is being heralded as an important part of the solution to the capacity problem in future networks, and is expected to be natively supported in 5G. Given the high network complexity and required signalling overhead associated with achieving synchronization in D2D networks, it is necessary to study asynchronous D2D communications. In this paper, we consider a scenario whereby asynchronous D2D communication underlays an OFDMA macro-cell in the uplink. Motivated by the superior performance of new waveforms with increased spectral localization in the presence of frequency and time misalignments, we compare the system-level performance of a set-up for when D2D pairs use either OFDM or FBMC/OQAM. We first demonstrate that inter-D2D interference, resulting from misaligned communications, plays a significant role in clustered D2D topologies. We then demonstrate that the resource allocation procedure can be simplified when D2D pairs use FBMC/OQAM, since the high spectral localization of FBMC/OQAM results in negligible inter-D2D interference. Specifically, we identify that FBMC/OQAM is best suited to scenarios consisting of small, densely populated D2D clusters located near the encompassing cell's edge.Comment: 7 pages, 9 figures, Accepted at IEEE Globecom 2016 Workshop

The Protective Rolls of Taraxacum officinale against Carbone Tetrachloride Infarction in the Liver

Carbon tetrachloride (CCl4) is a liquid that is colorless, transparent, inflammable, and volatile. Its central carbon atom is surrounded by four Cl- atoms. As a result, the objective of this effort was to estimate the anti-oxidant properties of silver nanoparticles (AgNPs) made utilizing aqueous plant extracts from Taraxacum officinale leaves. A green synthesis of AgNPs using a synergistic aqueous extract from T. officinale leaves was tested against liver damage in rats caused by CCl4. The rats were randomly distributed into seven groups: Group 1: Control group, Group 2: Olive oil group, Group 3: AgNPs-treated group (100 mg/kg BW.), Group 4: AgNPs-treated group (200 mg/kg BW.), Group 5: CCl4 + Olive oil group, Group 6: (CCl4 + Olive Oil) + 100 mg/kg of AgNPs-treated group, and Group 7: (CCl4 + Olive oil) + 200 mg/kg of AgNPs-treated group one a week for 6 weeks. This study demonstrated a sustainable method for synthesizing AgNPs utilizing T. officinale leaf (TOL) extract. To characterize the synthesized T. officinale leaf-silver nanoparticles (TOL-AgNPs), various microscopic and spectroscopic methods were used. The effectiveness of the biosynthesized TOL-AgNPs against CCl4 was tested to assess their antioxidant potential. The antioxidant properties of synthetic TOL-AgNPs were also evaluated. Histopathological research showed that all groups treated with nano-extract had less severe inflammatory responses. Our findings demonstrated that AgNPs synthesized using the leaves of T. officinale possess a potential anti-oxidant activity against CCl4-induced liver injury in rats

Turbulent-like fluctuations in quasistatic flow of granular media

We analyze particle velocity fluctuations in a simulated granular system subjected to homogeneous quasistatic shearing. We show that these fluctuations share the following scaling characteristics of fluid turbulence in spite of their different physical origins: 1) Scale-dependent probability distribution with non-Guassian broadening at small time scales; 2) Power-law spectrum, reflecting long-range correlations and the self-affine nature of the fluctuations; 3) Superdiffusion with respect to the mean background flow