ï»¿The formalism presented here suggests a way in which the dynamics of perturbations in reasonably complicated scalar field theories can be implemented in software such as CAMB. There are a number of benefits to this approach, as well as some drawb…

We present a formalism for the numerical implementation of general theories of dark energy, combining the computational simplicity of the equation of…

We consider the low energy dynamics of charge two instantons on noncommutative $\mathbb{R}^{2}_{NC}\times\mathbb{R}^{2}_{NC}$ in U(2) 5-dimensional s…

Various soliton-obstruction systems have been studied from analytical perspective. We have used collective coordinate to approach the dynamics of sol…

Background

A well-known conjecture of Caratheodory states that the number of umbilic points on a closed convex surface in ${\mathbb E}^3$ must be greater than o…

In the first part of this paper we have laid ground for the near-BPS approximation, both analytically and numerically, using the baby Skyrme as a prototype model. Our analytical arguments also predict the rate of convergence to the BPS moduli space …

We study the baby Skyrme model as a theory that interpolates between two distinct BPS systems. For this a near-BPS approximation can be used which, h…

We consider classical curvature flows: 1-parameter families of convex embeddings of the 2-sphere into Euclidean 3-space which evolve by an arbitrary (non-homogeneous) function of the radii of curvature. The associated flow of the radii of curvature …

We consider classical curvature flows: 1-parameter families of convex embeddings of the 2-sphere into Euclidean 3-space which evolve by an arbitrary …

In the asymmetric barrier system the skyrmions behave similarly to the skyrmions observed in the symmetric barrier system. The bound skyrmions perform the normal circular motion about the configuration centre moving on and off the barrier during the…

This current work is an extension to work previously done by the authors. The dynamics of a baby skyrmion configuration, in a model Landau-Lifshitz e…

We demonstrate polarization spectroscopy of an excited state transition in room temperature cesium vapor. An anisotropy induced by a circularly polarized pump beam on the D2 transition is observed using a weak probe on the 6P3/2 to 7S1/2 transition.…

We demonstrate polarization spectroscopy of an excited state transition in room temperature cesium vapor. An anisotropy induced by a circularly polar…

We derive a hard upper limit for the spin of GX 339−4 of a∗<0.9 assuming that the inner disc inclination is the same as that of the binary orbit (70∘<i<45∘). This is inconsistent with the spin of 0.942+0.005−0.004 and inclination of i=18∘±1∘ derived…

We attempt to constrain the black hole spin in GX 339-4 from spectral fitting of disc dominated data using RXTE spectra from the three most recent ou…

We proved that Connected Vertex Cover is polynomial-time solvable for (sP1+P5)-free graphs for every integer s≥0. We finish our paper by posing the following two open problems.

The Connected Vertex Cover problem is to decide if a graph G has a vertex cover of size at most $k$ that induces a connected subgraph of $G$. This is…

(Abridged) X-ray clusters are conventionally divided into two classes: "cool core" (CC) clusters and "non-cool core" (NCC) clusters. Yet relatively l…

In typical one-dimensional models the Mermin-Wagner theorem forbids long range order, thus preventing finite-temperature phase transitions. We find a…

We present NuSTAR hard X-ray (3-79 keV) observations of three Type 2 quasars at z ~ 0.4-0.5, optically selected from the Sloan Digital Sky Survey (SD…

We explore the question of whether low and moderate luminosity Active Galactic Nuclei (AGNs) are preferentially found in galaxies that are undergoing…

The fundamental role of on-shell diagrams in quantum field theory has been recently recognized. On-shell diagrams, or equivalently bipartite graphs, …

We present a comprehensive derivation of linear perturbation equations for different matter species, including photons, baryons, cold dark matter, sc…

We investigate the far-infrared properties of galaxies selected via deep, narrow-band imaging of the H$\alpha$ emission line in four redshift slices …

We develop and implement a novel lattice Boltzmann scheme to study multicomponent flows on curved surfaces, coupling the continuity and Navier-Stokes…

Motivated by the fact that in several cases a matching in a graph is stable if and only if it is produced by a greedy algorithm, we study the problem…

Studies of collective human behavior in the social sciences, often grounded in details of actions by individuals, have much to offer `social' models …

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