Axions are hypothetical particles related to the violation of the charge-parity symmetry within the strong sector of the standard model, being one of the most prone candidates for dark matter. Multiple attempts to prove their existence are currently performed in different physical systems. Here, we predict that axions may couple to the electrostatic (Langmuir) modes of a strongly magnetized...
We checked classifiers as Naive Bayes, Random Forest, and Support Vector Classifier on sample of galaxies from SDSS DR9 (N=60561, 0.02<z<0.06). We used the absolute magnitudes Mu, Mg, Mr, Mi, and Mz, all the color indices, and inverse concentration indexes R50/R90 to the center as the attributes of galaxy. To define an accuracy of the mentioned above classifiers we applied the 5-folds...
Low-energy, self-gravitating solutions of a scalar field coupled to gravity, described by the Schrodinger-Poisson system, are good candidates for realistic astrophysical structures, being particularly suited to describe dark matter halos. In this work we study the scenario in which one of these structures is gravitationally perturbed by a point-like mass. We analyse the effects that the body...
We point out that the Kalb-Ramond field of string theory can help to generate a $U_{Y}(1)$ portal to dark matter. This entails the possibility that the $U_{Y}(1)$ gauge field is related to a fundamental vector field for open string interactions. The $U_{Y}(1)$ portal also implies dipole and fluorescent dark matter couplings of the form initially suggested by Profumo and Sigurdson [1], and...
