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Search Results: 1 - 10 of 344897 matches for " D. G. Baranov "
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Neutrino and Extra World
Baranov, D. S.;Volkov, G. G.
High Energy Physics - Phenomenology , 2013,
Abstract: The neutrino speed measurement experiments are the continuations of the classic light speed measurement experiments have been done in range of the solar planet system (Ole Roemer, 1676), in star system (James Braidely, 1728) and, at last, on the Earth (Lois Fizeau, 1849),.... The finite light speed measurement has led to the revolution in the humanity consciousness and eventually led to a new understanding of the visible universe. In 1998-2005, we had a lot of excited discussions at CERN about the possibilities to perform the neutrino experiments to test the superluminal neutrino hypothesis and to find new phenomena beyond the SM. From one hand the idea of such experiments was associated with the hope to understand the role of the V-A- weak interactions, the quark-lepton family symmetry, the neutrino space-time properties and to observe some indications on a new vacuum structure existence outside of the Weak Scale, i.e. in the region 1/R ~ (0.1-20) TeV. From another hand the general trends of this idea has been related to the possible existence some extra space-time noncompact dimensions of the universe. In this context it would be first serious encounter with the dual conception between the physical phenomena of microcosmos and of universe. One of the main goals is to find some new space-time peculiarities and structures that might explain the formation of our visible D=(3+1)-universe with all its space-time and internal symmetries which could be only a part of a vast Universe filled with other kinds of matter. The main difficulties of such experiments related to the possible relativity principle paradoxes have been discussed.
Neutrino On The Possible New Time Structure
Baranov, D. S.;Volkov, G. G.
High Energy Physics - Phenomenology , 2013,
Abstract: We continue to study the problems of discovering new temporal and spatial properties of neutrinos from the point of the possible multi-dimensional extension the D=(3+1)- special theory of relativity. It is neutrino that can connect our Universe with new types of the matter, the new Universe. The possible discovery with neutrino new structure of the Time can confirm these ideas. However, the neutrino experiments aimed at new phenomena search can lead us to paradoxes related with the limits of applicability of the theory of relativity which demands special studies. This new phenomenon one can call by "Neutrino Paradoxes in Theories of Relativity". As examples of such paradoxes one can illustrate on the neutrino experiments MINOS,OPERA et al devoted to the measurements of neutrino velocity. As the interpretation of their results are model-dependent, by our opinion, the main goal of the observation a possible new time structure in these experiments is not reached. As the solutions to this problem it seems to us the way of holding cycle of long base neutrino experiments at high(super-high) energies which requires further debate in the literature. In addition to our discussions one can remark that the questions of neutrino physics ($M_S \rightarrow O(1-20\, TeV- range)$) could be directly related to the collider physics at the LHC.
Neutrino and Extra World
D. S. Baranov,G. G. Volkov
Physics , 2012,
Abstract: The neutrino speed measurement experiments are the continuations of the classic light speed measurement experiments have been done in range of the solar planet system (Ole Roemer, 1676), in star system (James Braidely, 1728) and, at last, on the Earth (Lois Fizeau, 1849),.... The finite light speed measurement has led to the revolution in the humanity consciousness and eventually led to a new understanding of the visible universe. In 1998-2005, we had a lot of excited discussions at CERN about the possibilities to perform the neutrino experiments to test the superluminal neutrino hypothesis and to find new phenomena beyond the SM. From one hand the idea of such experiments was associated with the hope to understand the role of the V-A- weak interactions, the quark-lepton family symmetry, the neutrino space-time properties and to observe some indications on a new vacuum structure existence outside of the Weak Scale, i.e. in the region 1/R ~ (0.1-20) TeV. From another hand the general trends of this idea has been related to the possible existence some extra space-time noncompact dimensions of the universe. In this context it would be first serious encounter with the dual conception between the physical phenomena of microcosmos and of universe. One of the main goals is to find some new space-time peculiarities and structures that might explain the formation of our visible D=(3+1)-universe with all its space-time and internal symmetries which could be only a part of a vast Universe filled with other kinds of matter. The main difficulties of such experiments related to the possible relativity principle paradoxes have been discussed.
On applications of the model spaces to the construction of cocyclic perturbations of the semigroup of shifts on the semiaxis
G. G. Amosov,A. D. Baranov,V. V. Kapustin
Mathematics , 2012,
Abstract: We describe a construction of cocyclic perturbations of the semigroup of shifts on the semiaxis by means of the theory of model spaces. It is shown that one can choose an inner function that determines the model space so that the elements of the perturbed semigroup have a prescribed spectral type and differ from the elements of the initial semigroup by operators from the Schatten-von Neumann class $\mathfrak{S}_p$, $p>1$. The case of the trace class $\mathfrak{S}_1$ perturbations is considered separately.
On perturbations of the isometric semigroup of shifts on the semiaxis
G. G. Amosov,A. D. Baranov,V. V. Kapustin
Mathematics , 2012,
Abstract: We study perturbations $(\tilde\tau_t)_{t\ge 0}$ of the semigroup of shifts $(\tau_t)_{t\ge 0}$ on $L^2(\R_+)$ with the property that $\tilde\tau_t - \tau_t$ belongs to a certain Schatten-von Neumann class $\gS_p$ with $p\ge 1$. We show that, for the unitary component in the Wold-Kolmogorov decomposition of the cogenerator of the semigroup $(\tilde\tau_t)_{t\ge 0}$, {\it any singular} spectral type may be achieved by $\gS_1$ perturbations. We provide an explicit construction for a perturbation with a given spectral type based on the theory of model spaces of the Hardy space $H^2$. Also we show that we may obtain {\it any} prescribed spectral type for the unitary component of the perturbed semigroup by a perturbation from the class $\gS_p$ with $p>1$.
Subwavelength plasmonic chain for magneto-optics enhancement
D. G. Baranov,A. P. Vinogradov,A. A. Lisyansky
Physics , 2013, DOI: 10.1364/JOSAB.32.000281
Abstract: We study the enhancement of the magneto-optical effect in subdiffraction plasmonic chains. We show that in a periodic chain of the plasmonic nanoparticles embedded in a magneto-optical medium, propagation of a guided mode is accompanied by rotation of electrical dipoles (the Faraday effect). The angle of rotation per 1 {\mu}m is two orders of magnitude greater than that in the same bulk magneto-optical medium. We also demonstrate that the effect of Ohmic losses can be significantly reduced by using a gain-assisted chain composed of active core-shell nanoparticles (spasers). The dipole mode in such an array of magneto-optical spasers exhibits high values of the Faraday rotation and propagation length.
Superfluid transition in quasi2D Fermi gases
D. S. Petrov,M. A. Baranov,G. V. Shlyapnikov
Physics , 2002, DOI: 10.1103/PhysRevA.67.031601
Abstract: We show that atomic Fermi gases in quasi2D geometries are promising for achieving superfluidity. In the regime of BCS pairing for weak attraction, we calculate the critical temperature T_c and analyze possibilities of increasing the ratio of T_c to the Fermi energy. In the opposite limit, where a strong coupling leads to the formation of weakly bound quasi2D dimers, we find that their Bose-Einstein condensate will be stable on a long time scale.
Photospheric Magnetic Field: Relationship Between North-South Asymmetry and Flux Imbalance
E. S. Vernova,M. I. Tyasto,D. G. Baranov
Physics , 2012, DOI: 10.1007/s11207-014-0512-z
Abstract: Photospheric magnetic fields were studied using the Kitt Peak synoptic maps for 1976-2003. Only strong magnetic fields (B>100 G) of the equatorial region were taken into account. The north-south asymmetry of the magnetic fluxes was considered as well as the imbalance between positive and negative fluxes. The north-south asymmetry displays a regular alternation of the dominant hemisphere during the solar cycle: the northern hemisphere dominated in the ascending phase, the southern one in the descending phase during Solar Cycles 21-23. The sign of the imbalance did not change during the 11 years from one polar-field reversal to the next and always coincided with the sign of the Sun's polar magnetic field in the northern hemisphere. The dominant sign of leading sunspots in one of the hemispheres determines the sign of the magnetic-flux imbalance. The sign of the north-south asymmetry of the magnetic fluxes and the sign of the imbalance of the positive and the negative fluxes are related to the quarter of the 22-year magnetic cycle where the magnetic configuration of the Sun remains constant (from the minimum where the sunspot sign changes according to Hale's law to the magnetic-field reversal and from the reversal to the minimum). The sign of the north-south asymmetry for the time interval considered was determined by the phase of the 11-year cycle (before or after the reversal); the sign of the imbalance of the positive and the negative fluxes depends on both the phase of the 11-year cycle and on the parity of the solar cycle. The results obtained demonstrate the connection of the magnetic fields in active regions with the Sun's polar magnetic field in the northern hemisphere.
Transition to lasing induced by resonant absorption
I. A. Nechepurenko,D. G. Baranov,A. V. Dorofeenko
Physics , 2014,
Abstract: We theoretically demonstrate that increase of absorption with constant gain in laser systems can lead to onset of laser generation. This counter-intuitive absorption induced lasing (AIL) is explained by emergence of additional lasing modes created by an introduction of an absorbing medium with narrow linewidth. We show that this effect is universal and can be encountered in simple Fabry-Perot-like systems and doped spherical dielectric nanoresonators. The predicted behavior is robust against frequency detuning between the gain and absorbing medium.
Latitudinal Distribution of the Photospheric Magnetic Fields of Different Magnitudes
E. S. Vernova,M. I. Tyasto,D. G. Baranov
Physics , 2015,
Abstract: Photospheric magnetic fields are studied using synoptic maps for 1976-2003 (NSO, Kitt Peak). Synoptic maps were averaged over the period of nearly 3 solar cycles (Solar Cycles 21-23). The change of latitudinal distribution was considered for the following groups of magnetic fields: B = 0-5 G; B = 5-15 G; B = 15-50 G and B>50 G. Magnetic fields in each of the groups have common features of latitudinal distribution, while for different field groups these features change significantly. Each of the groups is closely related to a certain manifestation of the solar activity. Strong magnetic fields are connected with two manifestations of activity on the Sun: active regions (magnetic fields B>15 G)occupy sunspots zones and polar faculae (magnetic fields 50 G > B > 15 G) occupy latitudes around 65$^\circ$-75$^\circ$. Fields from 5 to 15 G occupy the polar regions and are connected with polar coronal holes (solar global dipole). Fields with B<5 G occupy: a) equatorial region; b) latitudes 40$^{\circ}$-60$^\circ$ connected with the solar global dipole.
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