Anomalous<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>ω</mml:mi></mml:math>-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>Z</mml:mi></mml:math>-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>γ</mml:mi></mml:math>vertex from hidden local symmetry

Harada, Masayasu; Matsuzaki, Shinya; Yamawaki, Koichi

doi:10.1103/physrevd.84.036010

Cited by 8 publications

(13 citation statements)

References 28 publications

(86 reference statements)

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“…An important consequence is that dissipative effects of the GSF enter the censorship condition only for fine-tuned orbits. This seems consistent with suggestions made in earlier analyses [13,33,35] (in which fine-tuning has not been considered).…”

Section: B Further Reduction To Critical Orbitssupporting

confidence: 93%

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Overspinning a Kerr black hole: The effect of the self-force

2015

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We study the scenario in which a massive particle is thrown into a rapidly rotating Kerr black hole in an attempt to spin it up beyond its extremal limit, challenging weak cosmic censorship. We work in black-hole perturbation theory, and focus on non-spinning, uncharged particles sent in on equatorial orbits. We first identify the complete parameter-space region in which overspinning occurs when back-reaction effects from the particle's self-gravity are ignored. We find, in particular, that overspinning can be achieved only with particles sent in from infinity. Gravitational self-force effects may prevent overspinning by radiating away a sufficient amount of the particle's angular momentum ("dissipative effect"), and/or by increasing the effective centrifugal repulsion, so that particles with suitable parameters never get captured ("conservative effect"). We analyze the full effect of the self-force, thereby completing previous studies by Jacobson and Sotiriou (who neglected the selfforce) and by Barausse, Cardoso and Khanna (who considered the dissipative effect on a subset of orbits). Our main result is an inequality, involving certain self-force quantities, which describes a necessary and sufficient condition for the overspinning scenario to be overruled. This "censorship" condition is formulated on a certain one-parameter family of geodesics in an extremal Kerr geometry. We find that the censorship condition is insensitive to the dissipative effect (within the first-order self-force approximation used here), except for a subset of perfectly fine-tuned orbits, for which a separate censorship condition is derived. We do not obtain here the self-force input needed to evaluate either of our two conditions, but discuss the prospects for producing the necessary data using state-of-the-art numerical codes.

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Section: B Further Reduction To Critical Orbitssupporting

confidence: 93%

“…In principle, the coupled set (35) with (37) determines the self-accelerated orbit, given the initial values E ∞ , L ∞ and a method for calculating the GSF along the orbit.…”

Section: A Equation Of Motion With Self-forcementioning

confidence: 99%

Overspinning a Kerr black hole: The effect of the self-force

2015

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“…This is discussed in section 5.4. The γω Z 0 vertex has been revisited using a framework which incorporates vector mesons as composite gauge bosons of the spontaneously broken hidden local symmetry [240]. It is shown that this vertex arises from the homogeneous part of the general solution to the anomaly equation and is not fully determined by the anomaly; the corresponding free parameters are related to the ω π γ → 0 decay.…”

Section: Pion Cross Sections In Nuclei and The Miniboone Puzzlementioning

confidence: 99%

Progress and open questions in the physics of neutrino cross sections at intermediate energies

2014

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New and more precise measurements of neutrino cross sections have renewed interest in a better understanding of electroweak interactions on nucleons and nuclei. This effort is crucial to achieving the precision goals of the neutrino oscillation program, making new discoveries, like the CP violation in the leptonic sector, possible. We review the recent progress in the physics of neutrino cross sections, putting emphasis on the open questions that arise in the comparison with new experimental data. Following an overview of recent neutrino experiments and future plans, we present some details about the theoretical development in the description of (anti)neutrino-induced quasielastic (QE) scattering and the role of multi-nucleon QE-like mechanisms. We cover not only pion production in nucleons and nuclei but also other inelastic channels including strangeness production and photon emission. Coherent reaction channels on nuclear targets are also discussed. Finally, we briefly describe some of the Monte Carlo event generators, which are at the core of all neutrino oscillation and cross-section measurements.

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“…On the second point, the effect of the dissipative self-gravity, i.e., the gravitational radiation is not so important if the rest masses of particles are much smaller than the black hole mass [18,19]. By contrast, it is not so easy to see whether the non-dissipative self-gravity is important in BSW process.…”

Section: Drawbacksmentioning

confidence: 99%

Timescale for trans-Planckian collisions in Kerr spacetime

Patil¹,

Joshi²,

Nakao³

et al. 2015

EPL

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We make a critical comparison between ultra-high energy particle collisions around an extremal Kerr black hole and that around an over-spinning Kerr singularity, mainly focusing on the issue of the timescale of collisions. We show that the time required for two massive particles with the proton mass or two massless particles of GeV energies to collide around the Kerr black hole with Planck energy is several orders of magnitude longer than the age of the Universe for astro-physically relevant masses of black holes, whereas time required in the over-spinning case is of the order of ten million years which is much shorter than the age of the Universe. Thus from the point of view of observation of Planck scale collisions, the over-spinning Kerr geometry, subject to their occurrence, has distinct advantage over their black hole counterparts.

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Anomalousω-Z-γvertex from hidden local symmetry

Cited by 8 publications

References 28 publications

Overspinning a Kerr black hole: The effect of the self-force

Overspinning a Kerr black hole: The effect of the self-force

Progress and open questions in the physics of neutrino cross sections at intermediate energies

Timescale for trans-Planckian collisions in Kerr spacetime

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