Another possible interplay between gravitation and cosmology

I describe here some features of a non-geometrical approach to quantum gravity which leads to another picture of ties of gravitation and cosmology. The role of taking into account the effect of time dilation of the standard cosmological model is considered. It is shown that the correction for no time dilation leads to a good accordance of Supernovae 1a data and predictions of the considered model. The distributions of stretch factor values of Supernovae 1a for the cases of time dilation and no time dilation are discussed.Comment: 7 pages, 4 figures, Latex. Version 2: The correction for no time dilation is considered. Version 3: The distributions of stretch factor values are discusse

Model of graviton-dusty universe

Primary features of a new cosmological model, which is based on conjectures about an existence of the graviton background and superstrong gravitational quantum interaction, are considered. An expansion of the universe is impossible in such the model because of deceleration of massive objects by the graviton background, which is similar to the one for the NASA deep space probes Pioneer 10, 11. Redshifts of remote objects are caused in the model by interaction of photons with the graviton background, and the Hubble constant depends on an intensity of interaction and an equivalent temperature of the graviton background. Virtual massive gravitons would be dark matter particles. They transfer energy, lost by luminous matter radiation, which in a final stage may be collected with black holes and other massive objects.Comment: Contribution to the 15th SIGRAV Conference on General Relativity and Gravitational Physics, September 9-12, 2002, Rome, Ital

Nonlinear current-voltage characteristics due to quantum tunneling of phase slips in superconducting Nb nanowire networks

We report on the transport properties of an array of N about 30 interconnected Nb nanowires, grown by sputtering on robust porous Si substrates. The analyzed system exhibits a broad resistive transition in zero magnetic field, H, and highly nonlinear V(I) characteristics as a function of H which can be both consistently described by quantum tunneling of phase slips.Comment: accepted for publication on Appl. Phys. Let

Super-strong interacting gravitons as a main engine of the universe without expansion or dark energy

The basic cosmological conjecture about the Dopplerian nature of redshifts may be false if gravitons are super-strong interacting particles. A quantum mechanism of classical gravity and the main features of a new cosmological paradigm based on it are described here.Comment: 5 pages, 3 figures, LaTeX. Final version of a Contribution to The sixth international symposium "Frontiers of Fundamental and Computational Physics" (FFP6), 26-29 September 2004, Udine, Ital

Discrete Symmetries Underlying Some Continuous Ones: Two Examples From Gravity And Particle Physics

Two examples, not connected at present, from author's papers (Nuovo Cim., 1992, v.105A, p.77 [hep-th/0207210] and GRG, 1999, v.31, p.1431 [gr-qc/0207017]) are considered here in which a physical model has discrete symmetries and additional non-observable coordinates or parameters. Then it is possible to introduce some apparent continuous symmetries of the model for an observer which cannot know values of these additional quantities.Comment: Contribution to the 5th Conference 'Symmetry In Nonlinear Mathematical Physics' which will be held in June 23-29, 2003, Kyiv, Ukrain

Interface Transparency of Nb/Pd Layered Systems

We have investigated, in the framework of proximity effect theory, the interface transparency T of superconducting/normal metal layered systems which consist of Nb and high paramagnetic Pd deposited by dc magnetron sputtering. The obtained T value is relatively high, as expected by theoretical arguments. This leads to a large value of the ratio $d_{s}^{cr}/ \xi_{s}$ although Pd does not exhibit any magnetic ordering.Comment: To be published on Eur. Phys. J.

The graviton background: a new way to quantum gravity

Graviton pairing and destruction of these pairs under collisions with bodies may lead to the Newtonian attraction. It opens us a new way to a very-low-energy quantum gravity model. In the model by the author, cosmological redshifts are caused by interactions of photons with gravitons of the background. Non-forehead collisions with gravitons lead to an additional relaxation of any photonic flux. Total galaxy number counts/redshift and galaxy number counts/magnitude relations are computed and found to be in a good agreement with galaxy observations.Comment: 6 pages, 2 figures, Latex. Poster contribution to the 12th symposium on particle physics, string theory and cosmology (PASCOS 2006), September 10 - 15, 2006, Columbus, Ohi

Different shapes of impurity concentration profiles formed by long-range interstitial migration

A model of interstitial impurity migration is proposed which explains the redistribution of ion-implanted boron in low-temperature annealing of nonamorphized silicon layers. It is supposed that nonequilibrium boron interstitials are generated either in the course of ion implantation or at the initial stage of thermal treatment and that they migrate inward and to the surface of a semiconductor in the basic stage of annealing. It is shown that the form of the "tail" in the boron profile with the logarithmic concentration axis changes from a straight line if the average lifetime of impurity interstitials is substantially shorter than the annealing duration to that bending upwards for increasing lifetime. The calculated impurity concentration profiles are in excellent agreement with the experimental data describing the redistribution of implanted boron for low-temperature annealing at 750 Celsius degrees for 1 h and at 800 Celsius degrees for 35 min. Simultaneously, the experimental phenomenon of incomplete electrical activation of boron atoms in the "tail" region is naturally explained.Comment: 13 pages, 3 figure

On some discrete subgroups of the Lorentz group

Some discrete subgroups of the Lorentz group are found using Fedorov's parametrization by means of complex vector-parameter. It is shown that the discrete subgroup of the Lorentz group, which have not fixed points, are contained in boosts along a spatial direction for time-like and space-like vectors and are discrete subgroups of the group SO(1,1), whereas discrete subgroups of isotropic vector are subgroups of SO(1,1)\times E(1,1).Comment: 9 page

A few remarks about the Pioneer anomaly

Some features of the Pioneer anomaly are discussed in context of author's explanation of this effect as a deceleration of the probes in the graviton background. It is noted that if the model is true then the best parameter of the anomalous acceleration should be not the distance to the Sun but a cosine of the angle between a velocity of the probe and its radius-vector.Comment: 3 pages, no figure, Latex. Poster contribution to the STScI Workshop "Astrophysics 2020: Large Space Missions Beyond the Next Decade", 13 Nov - 15 Nov 2007, Baltimore, US