2,707 research outputs found
Temporal signatures of the Cherenkov light induced by extensive air showers of cosmic rays detected with the Yakutsk array
We analyze temporal characteristics of signals from the wide field-of-view
(WFOV) Cherenkov telescope (CT) detecting extensive air showers (EAS) of cosmic
rays (CR) in coincidence with surface detectors of the Yakutsk array. Our aim
is to reveal causal relationships between measured characteristics and physical
properties of EAS.Comment: Preprint of an article submitted for consideration in IJMPD
\c{opyright} 2016 [copyright World Scientific Publishing Company]
http://www.worldscientific.com/worldscinet/ijmp
Magnetic relaxation of superconducting YBCO samples in weak magnetic fields
For the first time, magnetization of high-Tc samples with different
crystalline structure and its isothermal relaxation is studied at very weak
constant fields (H <= 0.1 Oe) for temperatures close to the critical ones.
Essential influence of twin boundaries in YBCO single crystals on magnetic
relaxation rate is shown. An estimation of effective pinning potential is made
in the framework of the collective pinning model.Comment: 6 pages, 2 figures; full version has been submitted to 'Low
Temperature Physics' (Fizika Nizkikh Temperatur
The surface density of holographic entropy
On the basis of postulates for the holographic description of gravity and the
introduction of entropic force, for static sources we derive the universal law:
the entropy of a holographic screen is equal to quarter of its area in the
Planck system of units.Comment: 6 page
Natural scale of cosmological constant in seesaw mechanism with broken SUSY
The cosmological constant is inherently determined by the scale of breaking
down supersymmetry in the mechanism of seesaw fluctuations of two
vacuum-states.Comment: 4 pages, revtex4 class, reference adde
Properties of potential modelling three benchmarks: the cosmological constant, inflation and three generations
We argue for a model of low-energy correction to the inflationary potential
as caused by the gauge-mediated breaking down the supersymmetry at the scale of
\mu_\textsc{x}\sim 10^4 GeV, that provides us with the seesaw mechanism of
thin domain wall fluctuations in the flat vacuum. The fluctuations are
responsible for the vacuum with the cosmological constant at the scale of
eV suppressed by the Planckian mass
via \mu_\Lambda\sim\mu_\textsc{x}^2/m_\mathtt{Pl}. The appropriate vacuum
state is occupied after the inflation with quartic coupling constant
\lambda\sim\mu_\textsc{x}/m_\mathtt{Pl}\sim 10^{-14} inherently related with
the bare mass scale of \widetilde m\sim\sqrt{\mu_\textsc{x}m_\mathtt{Pl}}\sim
10^{12} GeV determining the thickness of domain walls . Such the parameters of potential are still marginally
consistent with the observed inhomogeneity of matter density in the Universe.
The inflationary evolution suggests the vacuum structure compatible with three
fermionic generations of matter as well as with observed hierarchies of masses
and mixing in the Standard Model.Comment: 12 pages, 1 figure, revtex4 class, references adde
Renormalization group analysis of cosmological constraint on the mass of Higgs scalar
The Higgs boson of Standard Model, minimally coupled to the gravitation, is
not able to produce the inflation of early Universe if its mass exceeds the
threshold value, which is equal to m_H^{min} = 142 GeV in the tree
approximation for the scalar potential. Two-loop corrections modify the
estimate as m_H^{min} = 150 \pm 3 GeV, so that higher-order corrections of
perturbation theory are completely under control, though they are numerically
important in respect of experimental searches.Comment: 6 page
Possible Josephson-like behavior of the YBa2Cu3O7-x single crystal twin boundaries in low magnetic fields
The experimental results on the magnetic response of YBCO single crystals
with unidirectional twin boundary planes in low magnetic fields (0.01 - 1 Oe)
are discussed. The observed non-monotone temperature dependence of
magnetization is interpreted within a plausible model of a system of the
Josephson weak links in the twin boundary planes and on the basis of the order
parameter anisotropy.Comment: 4 pages, 2 figures, the full version will be published in Low
Temperature Physics (2004
Compensation of Dipolar-Exciton Spin Splitting in Magnetic Field
Magnetoluminescence of spatially indirect dipolar excitons collected in 25 nm
GaAs/AlGaAs single quantum well within a lateral potential trap has been
studied in perpendicular magnetic field in Faraday geometry. The paramagnetic
spin splitting of the luminescence line of the heavy-hole excitons in the trap
centre is completely compensated at magnetic fields below critical value,
around 2 Tesla. The effect of spin-splitting compensation is caused by the
exchange interaction in dense exciton Bose gas which is in qualitative
agreement with the existing theoretical concepts. In the range of low magnetic
fields, less than 1.5 Tesla, an unusually large blue shift, upto 3 meV, is
observed, which is related to in-plane electric field component present in
nonhomogeneous electrostatic field of the trap.Comment: 9 pages, 3 figure
The holographic screen at low temperatures
A permissible spectrum of transverse vibrations for the holographic screen
modifies both a distribution of thermal energy over bits at low temperatures
and the law of gravitation at small accelerations of free fall in agreement
with observations of flat rotation curves in spiral galaxies. This modification
relates holographic screen parameters in de Sitter space-time with the Milgrom
acceleration in MOND.Comment: 7 pages, 1 figur
Decoupling of Higgs boson from the inflationary stage of Universe evolution
The constraint on the mass of Higgs field in the Standard Model at the
minimal interaction with the gravity is derived in the form of lower bound
GeV by the strict requirement of decoupling the Higgs boson from the
inflation of early Universe: the inflation produced by the Higgs scalar could
crucially destroy visible properties of large scale structure of Universe,
while the large mass makes the Higgs particle not able to produce the inflation
and shifts its cosmological role into the region of quantum gravity.Comment: 6 pages, svjour class, comments and reference adde
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