A
bstract
The phase diagram of two-color QCD with non-zero chiral chemical potential is studied by means of lattice simulation. We focus on the influence of a chiral chemical potential on the ...confinement/deconfinement phase transition and the breaking/restoration of chiral symmetry. The simulation is carried out with dynamical staggered fermions without rooting. The dependences of the Polyakov loop, the chiral condensate and the corresponding susceptibilities on the chiral chemical potential and the temperature are presented. The critical temperature is observed to increase with increasing chiral chemical potential.
We simulate lattice QCD with two flavors of Wilson fermions at imaginary baryon chemical potential. Results for the baryon number density computed in the confining and deconfining phases at imaginary ...baryon chemical potential are used to determine the baryon number density and higher cumulants at the real chemical potential via analytical continuation.
A novel approach to the problem of deriving the generating functional for the canonical ensemble in lattice QCD at a nonzero chemical potential is proposed. The derivation proceeds in several steps. ...First, the baryon density for imaginary values of the chemical potential is obtained. Then, again for imaginary values of the chemical potential, the generating functional of the grand canonical ensemble is derived. In this analysis, a fit of baryon density is employed toward simplifying the procedure of numerical integration. Finally, the generating potential for the canonical ensemble is derived using a high-precision numerical Fourier transform. The generating functional for the canonical ensemble is also derived using the known hopping-parameter expansion, and the results obtained with the two methods are compared for the deconfinement phase in the lattice QCD with two flavors.
The effects of composite fibroin-gelatin microparticles (100-250 μ) on the rate of wound healing and regeneration under conditions of contraction prevention were studied on the model of splinted ...full-thickness skin wound in a mouse. Subcutaneous injection of these particles into the defect area accelerated wound healing and promoted re-epithelialization and recovery of normal structure of the epidermis. In addition, the composite microparticles promoted the formation of connective tissue of characteristic structure, replacing the derma over the entire defect, and stimulated regeneration of subcutaneous muscle (panniculus carnosus) and skin appendages (sebaceous glands and hair follicles).
Casimir effect with machine learning Chernodub, M. N.; Erbin, Harold; Grishmanovskii, I. V. ...
Physical review research,
09/2020, Letnik:
2, Številka:
3
Journal Article
Recenzirano
Odprti dostop
Vacuum fluctuations of quantum fields between physical objects depend on the shapes, positions, and internal composition of the latter. For objects of arbitrary shapes, even made from idealized ...materials, the calculation of the associated zero-point (Casimir) energy is an analytically intractable challenge. We propose a new numerical approach to this problem based on machine-learning techniques and illustrate the effectiveness of the method in a (2+1) dimensional scalar field theory. The Casimir energy is first calculated numerically using a Monte-Carlo algorithm for a set of the Dirichlet boundaries of various shapes. Then, a neural network is trained to compute this energy given the Dirichlet domain, treating the latter as black-and-white pixelated images. We show that after the learning phase, the neural network is able to quickly predict the Casimir energy for new boundaries of general shapes with reasonable accuracy.
Roberge–Weiss Transition in the Lee–Yang Approach Rogalev, R. N.; Bornyakov, V. G.; Gerasimeniuk, N. V. ...
Physics of particles and nuclei letters,
06/2023, Letnik:
20, Številka:
3
Journal Article
Recenzirano
Thermodynamic quantities characterizing dense and hot strongly interacting matter have been studied in the lattice regularization of QCD with two flavors in the Lee–Yang approach. It is shown that, ...at high temperatures and taking into account a sufficiently large number of fermionic modes, Lee–Yang zeros in the complex plane of baryon fugacity lie on the negative real semiaxis, which corresponds to the Roberge–Weiss transition. On the line of Lee–Yang zeros, the baryon density and pressure have a gap; it is shown that the baryon density jump is proportional to the density of Lee–Yang zeros. Two methods for calculating baryon number distributions are considered; it is shown that the method based on the asymptotic estimate gives only positive state probabilities with a certain baryon number, as opposed to numerical integration. The importance of experimental measurements of these probabilities to study the issue of achieving thermodynamic equilibrium in nuclear-nuclear collisions is discussed.
•A chimeric recombinant protein PSH was composed of two enzymes, Prx6 and SOD.•Analysis of properties of PSH protein confirmed its high antioxidant activity.•The chimeric recombinant PSH can be ...considered as an effective radioprotector.
A chimeric recombinant protein PSH was composed of two antioxidant enzymes, human peroxiredoxin 6 (Prx6) and superoxide dismutase (MnSOD) from Escherichia coli. Analysis of physico-chemical properties of PSH protein confirmed its high antioxidant activity. PSH was shown to protect animals from lethal and sub-lethal doses of ionizing radiation. PSH was most effective after intravenous administration short time before ionizing irradiation. Dose reduction factor for PSH comprised 1.33. PSH was effectively alleviating the degree of radiation-induced leucopenia and thrombocytopenia in animals. Beside that, PSH administration decreased DNA damage in red bone marrow cells. The chimeric recombinant PSH can be considered as an effective radioprotector for minimizing the risks of damage of animal’s body by ionizing radiation, and it could be a promising therapeutic molecule for prevention/suppression of pathological conditions accompanied or caused by oxidative stress.
The scale (conformal) anomaly can generate an electric current near the boundary of a system in the presence of a static magnetic field. The magnitude of this magnetization current, produced at zero ...temperature and in the absence of matter, is proportional to a beta function associated with the renormalization of the electric charge. Using first-principle lattice simulations, we investigate how the breaking of the scale symmetry affects this ``scale magnetic effect'' near a Dirichlet boundary in scalar QED (Abelian Higgs model). We demonstrate the interplay of the generated current with vortex excitations both in symmetric (normal) and broken (superconducting) phases and compare the results with the anomalous current produced in the conformal, scale-invariant regime. Possible experimental signatures of the effect in Dirac semimetals are discussed.
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