NN Interaction JISP16: Current Status and Prospect

We discuss realistic nonlocal NN interactions of a new type - J-matrix Inverse Scattering Potential (JISP). In an ab exitu approach, these interactions are fitted to not only two-nucleon data (NN scattering data and deuteron properties) but also to the properties of light nuclei without referring to three-nucleon forces. We discuss recent progress with the ab initio No-core Shell Model (NCSM) approach and respective progress in developing ab exitu JISP-type NN-interactions together with plans of their forthcoming improvements.Comment: 9 pages, 3 figures, to be published in Proceedings of Few-body 19 conferenc

Symplectic Gravity Models in Four, Three and Two Dimensions

A class of the $D=4$ gravity models describing a coupled system of $n$ Abelian vector fields and the symmetric $n \times n$ matrix generalizations of the dilaton and Kalb-Ramond fields is considered. It is shown that the Pecci-Quinn axion matrix can be entered and the resulting equations of motion possess the $Sp(2n, R)$ symmetry in four dimensions. The stationary case is studied. It is established that the theory allows a $\sigma$-model representation with a target space which is invariant under the $Sp[2(n+1), R]$ group of isometry transformations. The chiral matrix of the coset $Sp[2(n+1), R]/U(n+1)$ is constructed. A K\"ahler formalism based on the use of the Ernst $(n+1) \times (n+1)$ complex symmetric matrix is developed. The stationary axisymmetric case is considered. The Belinsky-Zakharov chiral matrix depending on the original field variables is obtained. The Kramer-Neugebauer transformation, which algebraically maps the original variables into the target space ones, is presented.Comment: 21 pages, RevTex, no figurie

Standing Alfvén waves with m ? 1 in an axisymmetric magnetosphere excited by a non-stationary source

International audienceAs a continuation of our earlier paper, we consider here the case of the excitation of standing Alfvén waves by a source of the type of sudden impulse. It is shown that, following excitation by such a source, a given magnetic shell will exhibit oscillations with a variable frequency which increases from the shell's poloidal to toroidal frequency. Simultaneously, the oscillations will also switch over from poloidally (radially) to toroidally (azimuthally) polarized. With a reasonably large attenuation, only the start of this process, the stage of poloidal oscillations, will be observed in the ionosphere

Standing Alfvén waves with m ? 1 in an axisymmetric magnetosphere excited by a stochastic source

International audienceIn the framework of an axisymmetric magnetospheric model, we have constructed a theory for broad-band standing Alfvén waves with large azimuthal wave number m » 1 excited by a stochastic source. External currents in the ionosphere are taken as the oscillation source. The source with statistical properties of "white noise" is considered at length. It is shown that such a source drives oscillations which also have the "white noise" properties. The spectrum of such oscillations for each harmonic of standing Alfvén waves has two maxima: near the poloidal and toroidal eigenfrequencies of the magnetic shell of the observation. In the case of a small attenuation in the ionosphere the maximum near the toroidal frequency is dominated, and the oscillations are nearly toroidally polarized. With a large attenuation, a maximum is dominant near the poloidal frequency, and the oscillations are nearly poloidally polarized

String theory extensions of Einstein-Maxwell fields: the static case

We present a new approach for generation of solutions in the four-dimensional heterotic string theory with one vector field and in the five-dimensional bosonic string theory starting from the static Einstein-Maxwell fields. Our approach allows one to construct the solution classes invariant with respect to the total subgroup of the three-dimensional charging symmetries of these string theories. The new generation procedure leads to the extremal Israel-Wilson-Perjes subclass of string theory solutions in a special case and provides its natural continuous extension to the realm of non-extremal solutions. We explicitly calculate all string theory solutions related to three-dimensional gravity coupled to an effective dilaton field which arises after an appropriate charging symmetry invariant reduction of the static Einstein-Maxwell system.Comment: 19 pages in late

Дослідження антидепресивних властивостей нових похідних 1,2,3-триазоло-1,4-бензодіазепінів

Anxiety-depressive disorders are among the most common mental health conditions and often cause significant functional impairment, affecting a person’s quality of life. Research conducted in recent years indicate the importance of studying and searching for new substances based on benzodiazepines, in particular triazolobenzodiazepines, for the treatment of anxiety states and disorders, as well as determining the presence of other biological activities of these compounds. Aim. To study the antidepressant activity of new derivatives of 1,2,3-triazolo-1,4-benzodiazepines in the Porsolt forced swim and tail suspension tests. Materials and methods. The antidepressant activity of new 1,2,3-triazolo-1,4-benzodiazepine derivatives under the code MA-252, MA-253, MA-254, MA-255 and MA-261 was studied in the Porsolt forced swim and tail suspension tests. The following behavioral reactions, such as the latent period of the first immobility (more than 5 seconds), the total duration of immobility (staying in a stationary state), the number of immobile episodes, were recorded. Results and discussion. During the study, a decrease in the total duration of immobility, the main indicator of “despair” of animals, and an increase in the latent period of the first immobility were monitored. It may indicate the manifestation of antidepressant properties of new 1,2,3-triazolo-1,4-benzodiazepine derivatives. The indicator of the antidepressant activity in groups of animals administered MA-253, MA-254 and MA-255 derivatives in all doses was higher among the groups studied. The depression index was the lowest when MA-253 and MA-254 derivatives were used in the dose of 1 mg/kg, and was not statistically significantly different from that in the group receiving imipramine in the dose of 25 mg/kg. According to the results of the tail suspension test, 1,2,3-triazolo-1,4-benzodiazepine derivatives MA-253, MA-254 and MA-255 showed a significant decrease in the total duration of immobilization by 69.4 %, 47.1 % and 33.1 %, respectively, in relation to the control group (p<0.05), as well as an increase in the latent period of the onset of the first immobility episode by several times. Conclusions. A decrease in the duration of immobility in mice injected with 1,2,3-triazolo-1,4-benzodiazepine derivatives gives grounds to draw a conclusion that animals develop a state of “behavioral despair” and exhibit antidepressant properties.Тривожно-депресивні розлади є одними з найпоширеніших станів психічного здоров’я і часто викликають значні функціональні порушення, впливаючи на якість життя людини. Дослідження останніх років свідчать про важливість вивчення та пошуку нових речовин на основі бензодіазепінів, зокрема триазолобензодіазепінів, для лікування тривожних станів та розладів, а також виявлення інших біологічних активностей цих сполук. Метою роботи було дослідити антидепресивну активність нових похідних 1,2,3-триазоло-1,4-бензодіазепінів у тестах примусового плавання за Порсолтом та «підвішування за хвіст». Матеріали та методи. Антидепресивну активність нових похідних 1,2,3-триазоло-1,4-бензодіазепінів під шифром МА-252, МА-253, МА-254, МА-255 та МА-261 досліджували в тестах примусового плавання за Порсолт та «підвішування за хвіст». Реєстрували такі поведінкові реакції, як: латентний період першого зависання (понад 5 секунд), загальна тривалість іммобілізації (перебування в нерухомому стані), кількість зависань. Результати та їх обговорення. Під час дослідження відстежували зменшення загальної тривалості завмирання, основного показника «відчаю» тварин, та збільшення латентного періоду першого зависання, що може свідчити про прояв антидепресивних властивостей нових похідних 1,2,3-триазоло-1,4-бензодіазепінів. Показник антидепресивної активності в групах тварин, яким вводили МА-253, МА-254 та МА-255 в усіх досліджуваних дозах, був вищий серед досліджуваних груп. Індекс депресивності був найнижчий за застосування похідних МА-253 та МА-254 в дозі 1 мг/кг та статистично значуще не відрізнявся від такого в групі, тварини якої отримували іміпрамін в дозі 25 мг/кг. За результатами тесту «підвішування за хвіст» похідні 1,2,3-триазоло-1,4-бензодіазепінів МА-253, МА-254 та МА-255 продемонстрували помітне зменшення загальної тривалості іммобілізації на 69,4 %, 47,1 % та 33,1 % відповідно, якщо порівнювати з групою контролю (р<0,05), а також збільшення латентного періоду настання першого завмирання в декілька разів. Висновки. Зменшення тривалості іммобілізації в мишей, яким вводили похідні 1,2,3-триазоло-1,4-бензодіазепінів, дає підставу виснувати про зменшення розвитку у тварин стану «поведінкового відчаю» та прояв антидепресивних властивостей

Population of isomers in decay of the giant dipole resonance

The value of an isomeric ratio (IR) in N=81 isotones ($^{137}$Ba, $^{139}$Ce, $^{141}$Nd and $^{143}$Sm) is studied by means of the ($\gamma, n)$ reaction. This quantity measures a probability to populate the isomeric state in respect to the ground state population. In ($\gamma, n)$ reactions, the giant dipole resonance (GDR) is excited and after its decay by a neutron emission, the nucleus has an excitation energy of a few MeV. The forthcoming $\gamma$ decay by direct or cascade transitions deexcites the nucleus into an isomeric or ground state. It has been observed experimentally that the IR for $^{137}$Ba and $^{139}$Ce equals about 0.13 while in two heavier isotones it is even less than half the size. To explain this effect, the structure of the excited states in the energy region up to 6.5 MeV has been calculated within the Quasiparticle Phonon Model. Many states are found connected to the ground and isomeric states by $E1$, $E2$ and $M1$ transitions. The single-particle component of the wave function is responsible for the large values of the transitions. The calculated value of the isomeric ratio is in very good agreement with the experimental data for all isotones. A slightly different value of maximum energy with which the nuclei rest after neutron decay of the GDR is responsible for the reported effect of the A-dependence of the IR.Comment: 16 pages, 4 Fig

Ecological and biological evaluation of varietal resources Paeonia L. in Ukraine

The present state of the trends of the use of herbaceous species of Paeonia L. was studied and their prospects for greening the Podillya area were determined. The cultivars and hybrids of peony culture are investigated, entered in the State Register of Ukraine and analyzed the dynamics of their creation over the years. The analysis of researches and publications of cultivars of milky-flowered breeding breeding in our country was carried out. The decorative properties of the herbaceous peony varieties (Paeonia lactiflora Pall.) Were analyzed and the characteristics of the varieties represented by the originator of the varieties represented by all indicators were studied. According to the results of the research, Paeonia L. varieties, which are entered in the State Register on a set of indicators that determine their decorative and economic and biological qualities, are recommended as objects for the enrichment of the plant variety for planting the Ukraine. The analysis of species and grade composition of Paeonia L

Building blocks of a black hole

What is the nature of the energy spectrum of a black hole ? The algebraic approach to black hole quantization requires the horizon area eigenvalues to be equally spaced. As stressed long ago by by Mukhanov, such eigenvalues must be exponentially degenerate with respect to the area quantum number if one is to understand black hole entropy as reflecting degeneracy of the observable states. Here we construct the black hole states by means of a pair of "creation operators" subject to a particular simple algebra, a slight generalization of that for the harmonic oscillator. We then prove rigorously that the n-th area eigenvalue is exactly 2 raised to the n-fold degenerate. Thus black hole entropy qua logarithm of the number of states for fixed horizon area comes out proportional to that area.Comment: PhysRevTeX, 14 page