Beltrán Jiménez, Jose Bettoni, Dario Brax, Philippe

We consider cosmological models where dark matter is charged under a dark Abelian gauge field. This new interaction is repulsive and competes with gravity on large scales and in the dynamics of galaxies and clusters. We focus on non-linear models of dark electrodynamics where the effects of the new force are screened within a K-mouflage radius that...

mohyud-din, syed tauseef abdeljawad, t. khan, umar ahmed, naveed khan, ilyas

Thermal transport analysis in colloidal suspension is significant from industrial, engineering, and technological points of view. It has numerous applications comprised in medical sciences, chemical and mechanical engineering, electronics, home appliances, biotechnology, computer chips, detection of cancer cells, microbiology, and chemistry. The ca...

Spallicci, Alessandro D.A.M. Ragosta, Fabio Helayel-Neto, José A. López-Corredoira, Martín

We revisit for 714 SNeIa the discrepancy between the red-shift associated to the distance modulus $\mu$ and the spectroscopic red-shift. Previous work has shown that the total red-shift $z$ might be a combination of the expansion red-shift $z_{\rm C}$ and of a static, blue or red shift $z_{\rm LSV}(r)$, $r$ being the comoving distance. The latter i...

ali zaidi, syed zulfiqar khan, umar ahmed, naveed mohyud-din, syed tauseef chu, yu-ming khan, ilyas nisar, kottakkaran sooppy

The flow of nanofluid over a curved Riga surface is a topic of interest in the field of fluid dynamics. A literature survey revealed that the impacts of freezing temperature and the diameter of nanoparticles on the heat transfer over a curved Riga surface have not been examined so far. Therefore, the flow of nanoparticles, which comprises the influ...

rovenski, vladimir

We investigated, for the first time, the curve shortening flow in the metric-affine plane and prove that under simple geometric condition (when the curvature of initial curve dominates the torsion term) it shrinks a closed convex curve to a &ldquo / round point&rdquo / in finite time. This generalizes the classical result by M. Gage and R.S. Hamilt...

Logachev, Oleg A. Fedorov, Sergey N. Yashchenko, Valerii V.
Published in
Discrete Mathematics and Applications

A new equivalence relation on the set of Boolean functions is introduced: functions are declared to be Δ-equivalent if their autocorrelation functions are equal. It turns out that this classification agrees well with the cryptographic properties of Boolean functions: for functions belonging to the same Δ-equivalence class a number of their cryptogr...

Fabbri, Luca Moulin, Flora Barrau, Aurélien
Published in
The European Physical Journal C

Spinor fields are written in polar form so as to compute their tensorial connection, an object that contains the same information of the connection but which is also proven to be a real tensor. From this, one can still compute the Riemann curvature, encoding the information about gravity. But even in absence of gravity, when the Riemann curvature v...

Levi, Michèle McLeod, Andrew J. Von Hippel, Matthew

We compute the N$^3$LO gravitational quadratic-in-spin interactions at $G^4$ in the post-Newtonian (PN) expansion for the first time. This result contributes at the $5$PN order for maximally-spinning compact objects, adding the spinning case to the static sector at this PN accuracy. We carry out this computation within the effective field theory (E...

Dona, Pietro Gozzini, Francesco Sarno, Giorgio

We develop a numerical method to investigate the semiclassical limit of spin foam amplitudes with many vertices. We test it using the Ponzano-Regge model, a spin foam model for three-dimensional euclidean gravity, and a transition amplitude with three vertices. We study the summation over bulk spins, and we identify the stationary phase points that...

Oltean, Marius Epp, Richard J. Sopuerta, Carlos F. Spallicci, Alessandro D. A. M. Mann, Robert B.

An idealized "test" object in general relativity moves along a geodesic. However, if the object has a finite mass, this will create additional curvature in the spacetime, causing it to deviate from geodesic motion. If the mass is nonetheless sufficiently small, such an effect is usually treated perturbatively and is known as the gravitational self-...