1,228 research outputs found
Chandra Observation of the Anomalous X-ray Pulsar 1E 1841-045
We present the results from the {\it Chandra} ACIS CC mode observation of an
anomalous X-ray pulsar (AXP) 1E 1841-045. This is the first observation in
which the pulsar spectrum in wide energy range is spatially discriminated from
the surrounding SNR, Kes 73. Like other AXPs, the phase-integrated spectrum is
fitted well with power-law plus blackbody model. The spectral parameters are
, keV, and . This photon index is
significantly flatter than the other AXPs, and resemble to soft gamma-ray
repeaters (SGRs) in the quiescent state. The pulse profile is double-peaked,
and we found that the second peak has significantly hard spectrum. The spectra
of all phases are consistent with power-law plus blackbody model with constant
temperature and photon index. When fitted with two blackbody model, we obtained
similarly good fit. These results can be interpreted that there are two
emission regions with different energy spectra.Comment: 4 pages, 4 figures, accepted for publication in PASJ Letter
The universe out of a monopole in the laboratory?
To explore the possibility that an inflationary universe can be created out
of a stable particle in the laboratory, we consider the classical and quantum
dynamics of a magnetic monopole in the thin-shell approximation. Classically
there are three types of solutions: stable, collapsing and inflating monopoles.
We argue that the transition from a stable monopole to an inflating one could
occur either by collision with a domain wall or by quantum tunneling.Comment: to appear in Phys. Rev. D with changing title into "Is it possible to
create a universe out of a monopole in the laboratory?", text and figures
revised, 21 pages, 6 figure
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