3,261 research outputs found
Glucocorticoids for treating paediatric pulmonary hypertension: A novel use for a common medication
AbstractLaboratory investigations have shown the role of inflammation in the pathogenesis of pulmonary hypertension and improvement after anti-inflammatory drugs. Despite these observations, reports on the use of steroids to treat pulmonary hypertension in humans are absent from the literature. In this article, we report the use of glucocorticoids in the treatment of two children with pulmonary hypertension, demonstrating its potential utility.</jats:p
Multiplicativity of completely bounded -norms implies a strong converse for entanglement-assisted capacity
The fully quantum reverse Shannon theorem establishes the optimal rate of
noiseless classical communication required for simulating the action of many
instances of a noisy quantum channel on an arbitrary input state, while also
allowing for an arbitrary amount of shared entanglement of an arbitrary form.
Turning this theorem around establishes a strong converse for the
entanglement-assisted classical capacity of any quantum channel. This paper
proves the strong converse for entanglement-assisted capacity by a completely
different approach and identifies a bound on the strong converse exponent for
this task. Namely, we exploit the recent entanglement-assisted "meta-converse"
theorem of Matthews and Wehner, several properties of the recently established
sandwiched Renyi relative entropy (also referred to as the quantum Renyi
divergence), and the multiplicativity of completely bounded -norms due to
Devetak et al. The proof here demonstrates the extent to which the Arimoto
approach can be helpful in proving strong converse theorems, it provides an
operational relevance for the multiplicativity result of Devetak et al., and it
adds to the growing body of evidence that the sandwiched Renyi relative entropy
is the correct quantum generalization of the classical concept for all
.Comment: 21 pages, final version accepted for publication in Communications in
Mathematical Physic
Black hole quasinormal mode spectroscopy with LISA
The signal-to-noise ratio (SNR) for black hole quasinormal mode sources of
low-frequency gravitational waves is estimated using a Monte Carlo approach
that replaces the all-sky average approximation. We consider an eleven
dimensional parameter space that includes both source and detector parameters.
We find that in the black-hole mass range - the
SNR is significantly higher than the SNR for the all-sky average case, as a
result of the variation of the spin parameter of the sources. This increased
SNR may translate to a higher event rate for the Laser Interferometer Space
Antenna (LISA). We also study the directional dependence of the SNR, show at
which directions in the sky LISA will have greater response, and identify the
LISA blind spots.Comment: 12 pages, 5 figure
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