12,740 research outputs found
Quss Ibn Sa’ida al-Iyadi (6th–7th cent. A.D.), Bishop of Najran: An Arabic and Islamic Cultural Hero
The article deals with the half-legendary Quss Ibn Sa’ida from an ancient North Arab tribe
Iyad, who is believed to have been a bishop of the Yemeni city of Najran and a monk (anachorete). The sources from the Quranic and medieval Arab (Muslim) tradition are gathered and analysed to
underline the vivid place that Quss had in later historiography and theological works, and his unique
position, a Christian, in the history of the Arab-Muslim culture. The case of Quss is not without value
as far as the problem of common historical memory is concerned
Education of Young People and Children as a Way of Fighting Against Internet Hate, a Form of Cyber Violence
Due to highly innovative technologies such as the smartphone, cyber- bullying and on-line, aggression has increasingly affected individuals across the world. Cyber-bullying is defined as repeated unwanted, hurtful, harassing, and threatening interaction through electronic communication media. Anonymity and mobility afforded by the Internet have made harassment and expressions of hate effortless in a landscape that is abstract and beyond the realms of traditional law enforcement. Further, it argues that a broad coalition of government, schools, police and citizenry is likely to be most effective in reducing the harm caused by hate speech. The study discusses the targets of hate on the Internet, provides a framework within which problems can be identified and resolved by accentuating moral and social responsibility, and articulates possible solutions to combat with this increasing problem
An intuitive approach to inertial forces and the centrifugal force paradox in general relativity
As the velocity of a rocket in a circular orbit near a black hole increases,
the outwardly directed rocket thrust must increase to keep the rocket in its
orbit. This feature might appear paradoxical from a Newtonian viewpoint, but we
show that it follows naturally from the equivalence principle together with
special relativity and a few general features of black holes. We also derive a
general relativistic formalism of inertial forces for reference frames with
acceleration and rotation. The resulting equation relates the real experienced
forces to the time derivative of the speed and the spatial curvature of the
particle trajectory relative to the reference frame. We show that an observer
who follows the path taken by a free (geodesic) photon will experience a force
perpendicular to the direction of motion that is independent of the observers
velocity. We apply our approach to resolve the submarine paradox, which regards
whether a submerged submarine in a balanced state of rest will sink or float
when given a horizontal velocity if we take relativistic effects into account.
We extend earlier treatments of this topic to include spherical oceans and show
that for the case of the Earth the submarine floats upward if we take the
curvature of the ocean into account.Comment: 14 pages, 21 figure
Generalized Chaplygin Gas Models tested with SNIa
The so called Generalized Chaplygin Gas (GCG) with the equation of state was recently proposed as a candidate for dark
energy in the Universe. In this paper we confront the GCG with SNIa data.
Specifically we have tested the GCG cosmology in three different classes of
models with (1) , ; (2) ,
and (3) , , as well as the
model withouth any assumption on . The best fitted models are
obtained by minimalizing the function and levels in the
plane. We supplemented our analysis with confidence intervals
in the plane, as well as one-dimensional probability
distribution functions for models parameter. The general conclusion is that
SNIa data strongly support the Chaplygin gas (with ). Extending our
analysisby relaxing the flat prior lead to the result that even though the best
fitted values of are formally non-zero, still they are close to flat
case. It should be viewed as an advantage of the GCG model since in similar
analysisof CDM model high negative value of were found to
be bestfitted to the data and independent inspiration from CMBR and
extragalactic astronomy has been invoked to fix the curvature problem. Our
results show clearly that in Generalized Chaplygin Gas cosmology distant
supernovae should be brighter than in CDM model.This prediction seems
to be confirmed with new Riess high redshift SNIa sample. Moreover, we argue
that with the future SNAP data it would be possible to differentiate between
models with various value of parameter and/or discriminated between
GCG, Cardassian and CDM modelsComment: 54 pages 29 figures improved version analysis flat prior relaxed high
redshift Riess SNIa sample include
Comment on "Quantum entropy and special relativity" [by A. Peres, P. F. Scudo, and D. R. Terno, Phys. Rev. Lett. 88, 230402 (2002)]
Two subtleties of this paper are discussed.Comment: version probably to appear in Phys. Rev. Letter
Exact results for fidelity susceptibility of the quantum Ising model: The interplay between parity, system size, and magnetic field
We derive an exact closed-form expression for fidelity susceptibility of
even- and odd-sized quantum Ising chains in the transverse field. To this aim,
we diagonalize the Ising Hamiltonian and study the gap between its positive and
negative parity subspaces. We derive an exact closed-form expression for the
gap and use it to identify the parity of the ground state. We point out
misunderstanding in some of the former studies of fidelity susceptibility and
discuss its consequences. Last but not least, we rigorously analyze the
properties of the gap. For example, we derive analytical expressions showing
its exponential dependence on the ratio between the system size and the
correlation length.Comment: 11 pages, updated references, version accepted in JP
Realistic fast quantum gates with hot trapped ions
The "pushing gate" proposed by Cirac and Zoller in 2000 for quantum logic in
ion traps is discussed, in which a force is used to give a controlled push to a
pair of trapped ions and thus realize a phase gate. The original proposal had a
weakness in that it involved a hidden extreme sensitivity to the size of the
force. Also, the physical origin of this force was not fully addressed. Here,
we discuss the sensitivity and present a way to avoid it by choosing the
spatial form of the pushing force in an optimal way. We also analyse the effect
of imperfections in a pair of pi pulses which are used to implement a
"spin-echo" to cancel correlated errors. We present a physical model for the
force, namely the dipole force, and discuss the impact of unwanted photon
scattering, and of finite temperature of the ions. The main effect of the
temperature is to blur the phase of the gate owing to the ions exploring a
range of values of the force. When the distance scale of the force profile is
smaller than the ion separation, this effect is more important than the
high-order terms in the Coulomb repulsion which were originally discussed.
Overall, we find that whereas the "pushing gate" is not as resistant to
imperfections as was supposed, it remains a significant candidate for ion trap
quantum computing since it does not require ground state cooling, and in some
cases it does not require the Lamb-Dicke limit, while the gate rate is fast,
close to (rather than small compared to) the trap vibrational frequency.Comment: 24 pages, 9 figures, revtex
Breaking the entanglement barrier: Tensor network simulation of quantum transport
The recognition that large classes of quantum many-body systems have limited
entanglement in the ground and low-lying excited states led to dramatic
advances in their numerical simulation via so-called tensor networks. However,
global dynamics elevates many particles into excited states, and can lead to
macroscopic entanglement and the failure of tensor networks. Here, we show that
for quantum transport -- one of the most important cases of this failure -- the
fundamental issue is the canonical basis in which the scenario is cast: When
particles flow through an interface, they scatter, generating a "bit" of
entanglement between spatial regions with each event. The frequency basis
naturally captures that -- in the long-time limit and in the absence of
inelastic scattering -- particles tend to flow from a state with one frequency
to a state of identical frequency. Recognizing this natural structure yields a
striking -- potentially exponential in some cases -- increase in simulation
efficiency, greatly extending the attainable spatial- and time-scales, and
broadening the scope of tensor network simulation to hitherto inaccessible
classes of non-equilibrium many-body problems.Comment: Published version; 6+9 pages; 4+4 figures; Added: an example of
interacting reservoirs, further evidence on performance scaling, and extended
discussion of the numerical detail
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