2,254 research outputs found
In an Attempt to Introduce Long-range Interactions into Small-world Networks
Distinguishing the long-range bonds with the regular ones, the critical
temperature of the spin-lattice Guassian model built on two typical Small-world
Networks (SWNs) is studied. The results show much difference from the classical
case, and thus may induce some more accurate discussion on the critical
properties of the spin-lattice systems combined with the SWNs.Comment: 4 pages, 3 figures, 18 referenc
Discovery of two new hypervelocity stars from the LAMOST spectroscopic surveys
We report the discovery of two new unbound hypervelocity stars (HVSs) from
the LAMOST spectroscopic surveys. They are respectively a B2V type star of ~ 7
M with a Galactic rest-frame radial velocity of 502 km/s at a
Galactocentric radius of ~ 21 kpc and a B7V type star of ~ 4 M
with a Galactic rest-frame radial velocity of 408 km/s at a Galactocentric
radius of ~ 30 kpc. The origins of the two HVSs are not clear given their
currently poorly measured proper motions. However, the future data releases of
Gaia should provide proper motion measurements accurate enough to solve this
problem. The ongoing LAMOST spectroscopic surveys are expected to yield more
HVSs to form a statistical sample, providing vital constraint on understanding
the nature of HVSs and their ejection mechanisms.Comment: 5 pages, 3 figures, 1 table, accepted for publication in ApJ
Entropy and Its Quantum Thermodynamical Implication for Anomalous Spectral Systems
The state function entropy and its quantum thermodynamical implication for
two typical dissipative systems with anomalous spectral densities are studied
by investigating on their low-temperature quantum behavior. In all cases it is
found that the entropy decays quickly and vanishes as the temperature
approaches zero. This reveals a good conformity with the third law of
thermodynamics and provides another evidence for the validity of fundamental
thermodynamical laws in the quantum dissipative region.Comment: 10 pages, 3 figure
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