230 research outputs found
Optical Stern Gerlach Effect beyond the rotating wave approximation
We show that the inclusion of counter rotating terms, usually dropped, in the
interaction Hamiltonian of the electric dipole of a two level atom with an
electromagnetic field leads to significant modification of the splitting of an
atomic beam known as Optical Stern Gerlach Effect which now acquires a fine
structure.Comment: 9 pages, 1 figur
Elliptic Curves over Real Quadratic Fields are Modular
We prove that all elliptic curves defined over real quadratic fields are
modular.Comment: 38 pages. Magma scripts available as ancillary files with this arXiv
versio
Generally Deformed Oscillator, Isospectral Oscillator System and Hermitian Phase Operator
The generally deformed oscillator (GDO) and its multiphoton realization as
well as the coherent and squeezed vacuum states are studied. We discuss, in
particular, the GDO depending on a complex parameter q (therefore we call it
q-GDO) together with the finite dimensional cyclic representations. As a
realistic physical system of GDO the isospectral oscillator system is studied
and it is found that its coherent and squeezed vacuum states are closely
related to those of the oscillator. It is pointed out that starting from the
q-GDO with q root of unity one can define the hermitian phase operators in
quantum optics consistently and algebraically. The new creation and
annihilation operators of the Pegg-Barnett type phase operator theory are
defined by using the cyclic representations and these operators degenerate to
those of the ordinary oscillator in the classical limit q->1.Comment: 21 pages, latex, no figure
Coupled evolution of temperature and carbonate chemistry during the PaleoceneâEocene; new trace element records from the low latitude Indian Ocean
This is the final version. Available on open access from Elsevier via the DOI in this recordThe early Paleogene represents the most recent interval in Earthâs history characterized by global
greenhouse warmth on multi-million year timescales, yet our understanding of long-term climate and
carbon cycle evolution in the low latitudes, and in particular the Indian Ocean, remains very poorly
constrained. Here we present the first long-term sub-eccentricity-resolution stable isotope (ÎŽ13 30 C and
ÎŽ
18 O) and trace element (Mg/Ca and B/Ca) records spanning the late Paleoceneâearly Eocene (~58â
53 Ma) across a surfaceâdeep hydrographic reconstruction of the northern Indian Ocean, resolving
late Paleocene 405-kyr paced cyclicity and a portion of the PETM recovery. Our new records reveal a
long-term warming of ~4â5°C at all depths in the water column, with absolute surface ocean
temperatures and magnitudes of warming comparable to the low latitude Pacific. As a result of
warming, we observe a long-term increase in ÎŽ
18 Osw of the mixed layer, implying an increase in net
evaporation. We also observe a collapse in the temperature gradient between mixed layer- and
thermocline-dwelling species from ~57â54 Ma, potentially due to either the development of a more
homogeneous water column with a thicker mixed layer, or depth migration of the Morozovella in
response to warming. Synchronous warming at both low and high latitudes, along with decreasing
B/Ca ratios in planktic foraminifera indicating a decrease in ocean pH and/or increasing dissolved
inorganic carbon, suggest that global climate was forced by rising atmospheric CO2 concentrations
during this time.European Consortium for Ocean Research Drilling (ECORD)International Association of Sedimentologists (IAS)NSFNatural Environment Research Council (NERC
The IceCube Neutrino Observatory: Instrumentation and Online Systems
The IceCube Neutrino Observatory is a cubic-kilometer-scale high-energy
neutrino detector built into the ice at the South Pole. Construction of
IceCube, the largest neutrino detector built to date, was completed in 2011 and
enabled the discovery of high-energy astrophysical neutrinos. We describe here
the design, production, and calibration of the IceCube digital optical module
(DOM), the cable systems, computing hardware, and our methodology for drilling
and deployment. We also describe the online triggering and data filtering
systems that select candidate neutrino and cosmic ray events for analysis. Due
to a rigorous pre-deployment protocol, 98.4% of the DOMs in the deep ice are
operating and collecting data. IceCube routinely achieves a detector uptime of
99% by emphasizing software stability and monitoring. Detector operations have
been stable since construction was completed, and the detector is expected to
operate at least until the end of the next decade.Comment: 83 pages, 50 figures; updated with minor changes from journal review
and proofin
TOI-1338 : TESS' first transiting circumbinary planet
Funding: Funding for the DPAC has been provided by national institutions, in particular, the institutions participating in the Gaia Multilateral Agreement. W.F.W. and J.A.O.thank John Hood Jr. for his generous support of exoplanet research at SDSU. Support was also provided and acknowledged through NASA Habitable Worlds grant 80NSSC17K0741 and NASA XRP grant 80NSSC18K0519. This work is partly supported by NASA Habitable Worlds grant 80NSSC17K0741. This material is based upon work supported by the National Science Foundation Graduate Research Fellowship Program under grant No.(DGE-1746045). A.H.M.J.T. has received funding from the European Research Council (ERC) under the European Unionâs Horizon 2020 research and innovation programme (grant agreement No. 803193/BEBOP) and from a Leverhulme Trust Research Project grant No. RPG-2018-418. A.C. acknowledges support by CFisUC strategic project (UID/FIS/04564/2019).We report the detection of the first circumbinary planet (CBP) found by Transiting Exoplanet Survey Satellite (TESS). The target, a known eclipsing binary, was observed in sectors 1 through 12 at 30 minute cadence and in sectors 4 through 12 at 2 minute cadence. It consists of two stars with masses of 1.1 Mâ and 0.3 Mâ on a slightly eccentric (0.16), 14.6 day orbit, producing prominent primary eclipses and shallow secondary eclipses. The planet has a radius of âŒ6.9 Râ and was observed to make three transits across the primary star of roughly equal depths (âŒ0.2%) but different durationsâa common signature of transiting CBPs. Its orbit is nearly circular (e â 0.09) with an orbital period of 95.2 days. The orbital planes of the binary and the planet are aligned to within âŒ1°. To obtain a complete solution for the system, we combined the TESS photometry with existing ground-based radial-velocity observations in a numerical photometric-dynamical model. The system demonstrates the discovery potential of TESS for CBPs and provides further understanding of the formation and evolution of planets orbiting close binary stars.Publisher PDFPeer reviewe
European Atlas of Natural Radiation
Natural ionizing radiation is considered as the largest contributor to the collective effective dose received by the world population. The human population is continuously exposed to ionizing radiation from several natural sources that can be classified into two broad categories: high-energy cosmic rays incident on the Earthâs atmosphere and releasing secondary radiation (cosmic contribution); and radioactive nuclides generated during the formation of the Earth and still present in the Earthâs crust (terrestrial contribution). Terrestrial radioactivity is mostly produced by the uranium and thorium radioactive families together with potassium. In most circumstances, radon, a noble gas produced in the radioactive decay of uranium, is the most important contributor to the total dose.
This Atlas aims to present the current state of knowledge of natural radioactivity, by giving general background information, and describing its various sources. This reference material is complemented by a collection of maps of Europe displaying the levels of natural radioactivity caused by different sources.
It is a compilation of contributions and reviews received from more than 80 experts in their field: they come from universities, research centres, national and European authorities and international organizations.
This Atlas provides reference material and makes harmonized datasets available to the scientific community and national competent authorities. In parallel, this Atlas may serve as a tool for the public to:
âą familiarize itself with natural radioactivity;
âą be informed about the levels of natural radioactivity caused by different sources;
âą have a more balanced view of the annual dose received by the world population, to which natural radioactivity is the largest contributor;
âą and make direct comparisons between doses from natural sources of ionizing radiation and those from man-made (artificial) ones, hence to better understand the latter.JRC.G.10-Knowledge for Nuclear Security and Safet
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