5,566 research outputs found
ALMA and VLA observations of recombination lines and continuum toward the Becklin-Neugebauer object in Orion
Compared to their centimeter-wavelength counterparts, millimeter
recombination lines (RLs) are intrinsically brighter and are free of pressure
broadening. We report observations of RLs (H30alpha at 231.9 GHz, H53alpha at
42.9 GHz) and the millimeter and centimeter continuum toward the
Becklin-Neugebauer (BN) object in Orion, obtained from the Atacama Large
Millimeter/submillimeter Array (ALMA) Science Verification archive and the Very
Large Array (VLA). The RL emission appears to be arising from the
slowly-moving, dense (Ne=8.4x10^6 cm^-3) base of the ionized envelope around
BN. This ionized gas has a relatively low electron temperature (Te<4900 K) and
small (<<10 km s^-1) bulk motions. Comparing our continuum measurements with
previous (non)detections, it is possible that BN has large flux variations in
the millimeter. However, dedicated observations with a uniform setup are needed
to confirm this. From the H30alpha line, the central line-of-sight LSR velocity
of BN is 26.3 km s^-1.Comment: To appear in Astronomy and Astrophysics as a Letter to the editor.
Corrections to mm fluxes. Discussion about flux variability shortened.
Physical properties of ionized gas remain the same. Table 1 to main text
rather than online only. Language edite
Phantom inflation and the "Big Trip"
Primordial inflation is regarded to be driven by a phantom field which is
here implemented as a scalar field satisfying an equation of state
, with . Being even aggravated by the weird properties
of phantom energy, this will pose a serious problem with the exit from the
inflationary phase. We argue however in favor of the speculation that a smooth
exit from the phantom inflationary phase can still be tentatively recovered by
considering a multiverse scenario where the primordial phantom universe would
travel in time toward a future universe filled with usual radiation, before
reaching the big rip. We call this transition the "big trip" and assume it to
take place with the help of some form of anthropic principle which chooses our
current universe as being the final destination of the time transition.Comment: 23 pages, 5 figures, LaTex, Phys. Lett. B (in press
La asistencia religiosa penitenciaria en Cataluña: La Instrucción 1/2005 del dret a rebre atenció religiosa en el medi penitenciari
The Spanish Constitution of 1978 states that the central Government has the total responsibility to legislate on prison issues even though the execution of that law can be carried out by the autonomous regional governments. So far, Catalonia is the only territory that has exercised this opportunity, and has regulated religious care in penal institutions through the Instruction 1/2005. This article analyses the wording of this administrative order to determine if it is coherent with the national legislation, with the prior agreements between the State and the Catholic Church, and also with other religious institutions. The minimum standard rules of religious care should be guaranteed in the Instruction,..
Sugerencias acerca de un posible derecho administrativo sancionador en el ordenamiento canónico.
Material incluido en el volumen especial de la revista del Instituto Martín de Azpilcueta, Universidad de Navarra : Ius Canonicum (1999), en honor de Javier Hervada
The Importance of Boundary Conditions in Quantum Mechanics
We discuss the role of boundary conditions in determining the physical
content of the solutions of the Schrodinger equation. We study the
standing-wave, the ``in,'' the ``out,'' and the purely outgoing boundary
conditions. As well, we rephrase Feynman's prescription as a
time-asymmetric, causal boundary condition, and discuss the connection of
Feynman's prescription with the arrow of time of Quantum
Electrodynamics. A parallel of this arrow of time with that of Classical
Electrodynamics is made. We conclude that in general, the time evolution of a
closed quantum system has indeed an arrow of time built into the propagators.Comment: Contribution to the proceedings of the ICTP conference "Irreversible
Quantum Dynamics," Trieste, Italy, July 200
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