59,087 research outputs found
Alternative Derivation of the Correspondence Between Rindler and Minkowski Particles
We develop an alternative derivation of Unruh and Wald's seminal result that
the absorption of a Rindler particle by a detector as described by uniformly
accelerated observers corresponds to the emission of a Minkowski particle as
described by inertial observers. Actually, we present it in an inverted
version, namely, that the emission of a Minkowski particle corresponds in
general to either the emission or the absorption of a Rindler particle.Comment: 7 pages, no-figures, REVTE
Elementary particles under the lens of the black holes
After a brief review of the historical development and CLASSICAL properties
of the BLACK HOLES, we discuss how our present knowledge of some of their
QUANTUM properties shed light on the very concept of ELEMENTARY PARTICLE. As an
illustration, we discuss in this context the decay of accelerated protons,
which may be also relevant to astrophysics.Comment: 6 pages, Proceedings of the XXIII Brazilian National Meeting on
Particles Physics and Fields. To appear in special issue of the Brazilian
Journal of Physic
Deep Learning for Real-time Gravitational Wave Detection and Parameter Estimation: Results with Advanced LIGO Data
The recent Nobel-prize-winning detections of gravitational waves from merging
black holes and the subsequent detection of the collision of two neutron stars
in coincidence with electromagnetic observations have inaugurated a new era of
multimessenger astrophysics. To enhance the scope of this emergent field of
science, we pioneered the use of deep learning with convolutional neural
networks, that take time-series inputs, for rapid detection and
characterization of gravitational wave signals. This approach, Deep Filtering,
was initially demonstrated using simulated LIGO noise. In this article, we
present the extension of Deep Filtering using real data from LIGO, for both
detection and parameter estimation of gravitational waves from binary black
hole mergers using continuous data streams from multiple LIGO detectors. We
demonstrate for the first time that machine learning can detect and estimate
the true parameters of real events observed by LIGO. Our results show that Deep
Filtering achieves similar sensitivities and lower errors compared to
matched-filtering while being far more computationally efficient and more
resilient to glitches, allowing real-time processing of weak time-series
signals in non-stationary non-Gaussian noise with minimal resources, and also
enables the detection of new classes of gravitational wave sources that may go
unnoticed with existing detection algorithms. This unified framework for data
analysis is ideally suited to enable coincident detection campaigns of
gravitational waves and their multimessenger counterparts in real-time.Comment: 6 pages, 7 figures; First application of deep learning to real LIGO
events; Includes direct comparison against matched-filterin
Decay of protons and neutrons induced by acceleration
We investigate the decay of accelerated protons and neutrons. Calculations
are carried out in the inertial and coaccelerated frames. Particle
interpretation of these processes are quite different in each frame but the
decay rates are verified to agree in both cases. For sake of simplicity our
calculations are performed in a two-dimensional spacetime since our conclusions
are not conceptually affected by this.Comment: 18 pages (REVTEX), 3 figure
Search for semiclassical-gravity effects in relativistic stars
We discuss the possible influence of gravity in the neutronization process,
, which is particularly important as a cooling mechanism
of neutron stars. Our approach is semiclassical in the sense that leptonic
fields are quantized on a classical background spacetime, while neutrons and
protons are treated as excited and unexcited nucleon states, respectively. We
expect gravity to have some influence wherever the energy content carried by
the in-state is barely above the neutron mass. In this case the emitted
neutrinos would be soft enough to have a wavelength of the same order as the
space curvature radius.Comment: 10 pages (REVTEX
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