Black hole collapse and democratic models

Jansen, Aron; Magán, Javier M.

doi:10.1103/physrevd.94.104007

Cited by 13 publications

(11 citation statements)

References 68 publications

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“…More importantly, we have recently verified that this type of law describes the evolution of Bekenstein-Hawking entropy [43]. Plugging the previous expression (3.27) into (3.24), we obtain the evolution of entanglement entropy of a subset A of generalized free fields.…”

Section: Jhep08(2016)081mentioning

confidence: 92%

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Black holes as random particles: entanglement dynamics in infinite range and matrix models

Magán

2016

J. High Energ. Phys.

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We first propose and study a quantum toy model of black hole dynamics. The model is unitary, displays quantum thermalization, and the Hamiltonian couples every oscillator with every other, a feature intended to emulate the color sector physics of large-N matrix models. Considering out of equilibrium initial states, we analytically compute the time evolution of every correlator of the theory and of the entanglement entropies, allowing a proper discussion of global thermalization/scrambling of information through the entire system. Microscopic non-locality causes factorization of reduced density matrices, and entanglement just depends on the time evolution of occupation densities. In the second part of the article, we show how the gained intuition extends to large-N matrix models, where we provide a gauge invariant entanglement entropy for 'generalized free fields', again depending solely on the quasinormal frequencies. The results challenge the fast scrambling conjecture and point to a natural scenario for the emergence of the so-called brick wall or stretched horizon. Finally, peculiarities of these models in regards to the thermodynamic limit and the information paradox are highlighted.

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Section: Jhep08(2016)081mentioning

confidence: 92%

“…A similar law was recently found to describe Bekesntein-Hawking entropy evolution, see ref. [43]. Finally, just for completeness, notice that the Mutual Information between gauge invariant generalized free field modes is again zero at all times: 31) due to the extensivity of entanglement entropies through unitary evolution.…”

Section: Jhep08(2016)081mentioning

confidence: 99%

Black holes as random particles: entanglement dynamics in infinite range and matrix models

Magán

2016

J. High Energ. Phys.

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“…It may be added that aside from the approaches mentioned earlier, there have been many attempts to construct toy-models to study black hole physics [32][33][34][35][36][37]. The hope being that 'good' toy models teach us certain universal features of the dynamics of black hole horizons.…”

Section: Jhep11(2016)131mentioning

confidence: 99%

The black hole S-Matrix from quantum mechanics

Betzios

Gaddam

Papadoulaki

2016

J. High Energ. Phys.

103

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We revisit the old black hole S-Matrix construction and its new partial wave expansion of 't Hooft. Inspired by old ideas from non-critical string theory & c = 1 Matrix Quantum Mechanics, we reformulate the scattering in terms of a quantum mechanical model -of waves scattering off inverted harmonic oscillator potentials -that exactly reproduces the unitary black hole S-Matrix for all spherical harmonics; each partial wave corresponds to an inverted harmonic oscillator with ground state energy that is shifted relative to the s-wave oscillator. Identifying a connection to 2d string theory allows us to show that there is an exponential degeneracy in how a given total initial energy may be distributed among many partial waves of the 4d black hole.

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“…Consequently, the polarization of the electrons (positrons) during pair production process in that field generally will outstrip the radiative polarization. In previous studies [42][43][44], the polarization effects in the multiphoton Breit-Wheeler process have been considered in plane wave laser fields mostly of moderate intensity. It remained unclear if the sizable polarization of positrons in realistic strong laser fields is feasible.…”

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confidence: 99%

Polarized Positron Beams via Intense Two-Color Laser Pulses

et al. 2019

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Generation of ultrarelativistic polarized positrons during interaction of an ultrarelativistic electron beam with a counterpropagating two-color petawatt laser pulse is investigated theoretically. Our Monte Carlo simulation based on a semi-classical model, incorporates photon emissions and pair productions, using spin-resolved quantum probabilities in the local constant field approximation, and describes the polarization of electrons and positrons for the pair production and photon emission processes, as well as the classical spin precession inbetween. The main reason of the polarization is shown to be the spin-asymmetry of the pair production process in strong external fields, combined with the asymmetry of the two-color laser field. Employing a feasible scenario, we show that highly polarized positron beams, with a polarization degree of ζ ≈ 60%, can be produced in a femtosecond time scale, with a small angular divergence, ∼ 74 mrad, and high density ∼ 10 14 cm −3 . The laser-driven positron source, along with laser wakefield acceleration, may pave the way to small scale facilities for high energy physics studies.

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Black hole collapse and democratic models

Cited by 13 publications

References 68 publications

Black holes as random particles: entanglement dynamics in infinite range and matrix models

Black holes as random particles: entanglement dynamics in infinite range and matrix models

The black hole S-Matrix from quantum mechanics

Polarized Positron Beams via Intense Two-Color Laser Pulses

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