2,699,240 research outputs found
Quaternary warping at Gorge Saddle, western Southland
Gorge Saddle is one low point on a drainage divide between Fiordland and the Southland Plain. Eastward sloping Quaternary terraces east of the divide and westward sloping terraces to the west contain granitic pebbles which could have been derived only from the west. This suggests doming at the present divide concurrent with transport from the west
Shell evolution and its indication on the isospin dependence of the spin-orbit splitting
The available experimental data on shell evolution indicate that the strength
of the spin-orbit (SO) single-particle potential may be enhanced in
neutron-rich nuclei. We observe that such a simple scheme destroys the Harmonic
Oscillator (HO) magic numbers N=8 and 20 and generates new SO magic numbers
like N=6, 14, 16, 32 and 34. The traditional SO magic numbers like N=28 and 50
and N=14 seen in O are eroded somehow in neutron-rich nuclei due to the
sensitivity of larger- orbitals to the depth of the central potential but
they are more robust than the HO magic numbers. The N=82 shell closure persists
in neutron-rich nuclei while HO shell closures like N=40 and 70 do not emerge.
Both mechanisms contribute to enhancing the N=56 and 90 gaps by splitting the
and and the and orbitals.Comment: 8 pages, 9 figures, 1 table, version to appear in Phys. Lett. B,
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Polarized point sources in the LOFAR Two-meter Sky Survey: A preliminary catalog
The polarization properties of radio sources at very low frequencies (h45m–15h30m right ascension, 45°–57° declination, 570 square degrees). We have produced a catalog of 92 polarized radio sources at 150 MHz at 4.′3 resolution and 1 mJy rms sensitivity, which is the largest catalog of polarized sources at such low frequencies. We estimate a lower limit to the polarized source surface density at 150 MHz, with our resolution and sensitivity, of 1 source per 6.2 square degrees. We find that our Faraday depth measurements are in agreement with previous measurements and have significantly smaller errors. Most of our sources show significant depolarization compared to 1.4 GHz, but there is a small population of sources with low depolarization indicating that their polarized emission is highly localized in Faraday depth. We predict that an extension of this work to the full LOTSS data would detect at least 3400 polarized sources using the same methods, and probably considerably more with improved data processing
Coulomb Force as an Entropic Force
Motivated by Verlinde's theory of entropic gravity, we give a tentative
explanation to Coulomb's law with an entropic force. When trying to do this, we
find the equipartition rule should be extended to charges and the concept of
temperature should be reinterpreted. If one accepts the holographic principle
as well as our generalizations and reinterpretations, then Coulomb's law, the
Poisson equation and the Maxwell equations can be derived smoothly. Our attempt
can be regarded as a new way to unify the electromagnetic force with gravity,
from the entropic origin. Possibly some of our postulates are related to the
D-brane picture of black hole thermodynamics.Comment: discussion and bibliography update
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