1,022 research outputs found
The Relation of Thermal Fluctuation and Information-Entropy for One-Dimensional Rindler Oscillator
Within the framework of thermo-field-dynamics (TFD), the
information-entropies associated with the measurements of position and momentum
for one-dimensional Rindler oscillator are derived, and the connection between
its information-entropy and thermal fluctuation is obtained. A conclusion is
drawn that the thermal fluctuation leads to the loss of information.Comment: 14 pages, 1 figur
Proper Matter Collineations of Plane Symmetric Spacetimes
We investigate matter collineations of plane symmetric spacetimes when the
energy-momentum tensor is degenerate. There exists three interesting cases
where the group of matter collineations is finite-dimensional. The matter
collineations in these cases are either four, six or ten in which four are
isometries and the rest are proper.Comment: 10 pages, LaTex, accepted for publication in Modern Physics Letters
Solubility prediction of weak electrolyte mixtures
International audienceThe solubility of materials is a thermodynamic variable that depends on their chemical composition and with temperature. Solubility is also affected by the pH, by the presence of additional species in the solution, and by the use of different solvents. On electrolyte, the calculation of solubility requires that the mean ionic activity coefficient be known along with a thermodynamic solubility product
Reconstructing the Equation of State for Dark Energy In the Double Complex Symmetric Gravitational Theory
We propose to study the accelerating expansion of the universe in the double
complex symmetric gravitational theory (DCSGT). The universe we live in is
taken as the real part of the whole spacetime which is double
complex. By introducing the spatially flat FRW metric, not only the double
Friedmann Equations but also the two constraint conditions and
are obtained. Furthermore, using parametric ansatz, we reconstruct the
and for dark energy from real observational data. We
find that in the two cases of and , the
corresponding equations of state remain close to -1 at present
() and change from below -1 to above -1. The results illustrate that the
whole spacetime, i.e. the double complex spacetime , may be
either ordinary complex () or hyperbolic complex
(). And the fate of the universe would be Big Rip in the
future.Comment: 5 pages, 5 figures, accepted by Commun. Theor. Phy
Dirac quasinormal modes of a Schwarzschild black hole surrounded by free static spherically symmetric quintessence
We evaluate the quasinormal modes of massless Dirac perturbation in a
Schwarzschild black hole surrounded by the free static spherically symmetric
quintessence by using the third-order WKB approximation. The result shows that
due to the presence of quintessence, the massless field damps more slowly. The
real part of the quasinormal modes increases and the the absolute value of the
imaginary part increases when the state parameter increases. In other
words, the massless Dirac field decays more rapidly for the larger . And
the peak value of potential barrier gets higher as increases and the
location of peak moves along the right for fixed .Comment: 7 pages, 4 figure
Shape complexity and fractality of fracture surfaces of swelled isotactic polypropylene with supercritical carbon dioxide
We have investigated the fractal characteristics and shape complexity of the
fracture surfaces of swelled isotactic polypropylene Y1600 in supercritical
carbon dioxide fluid through the consideration of the statistics of the islands
in binary SEM images. The distributions of area , perimeter , and shape
complexity follow power laws , , and , with the scaling ranges spanning
over two decades. The perimeter and shape complexity scale respectively as
and in two scaling regions delimited by . The fractal dimension and shape complexity increase when the temperature
decreases. In addition, the relationships among different power-law scaling
exponents , , , , and have been derived analytically,
assuming that , , and follow power-law distributions.Comment: RevTex, 6 pages including 7 eps figure
The Complex Symmetry Gravitational Theory as a New Alternative of Dark Energy
We propose that complex symmetry gravitational theory (CSGT) explain the
accelerating expansion of universe. In this paper universe is taken as the
double complex symmetric space. Cosmological solution is obtained within CSGT.
The conditions of the accelerating expansion of universe are discussed within
CSGT. Moreover, the range of equation of state of matter is
given in the hyperbolic imaginary space.Comment: Latex 9 pages, submitted to International Journal of Theoretical
Physic
Population phylogenomic analysis of mitochondrial DNA in wild boars and domestic pigs revealed multiple domestication events in East Asia
A fine-grained mitochondrial DNA phylogenomic analysis was conducted in domestic pigs and wild boars, revealing that pig domestication in East Asia occurred in the Mekong and the middle and downstream regions of the Yangtze river
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