Discrete spectrum radiation from a charged particle moving in a medium with Maxwell's fish-eye refraction-index profile

Gevorkian, Zhyrair; Davtyan, M. A.

doi:10.1103/physreva.102.063504

Cited by 8 publications

(1 citation statement)

References 15 publications

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“…where plus/minus sign in the expression for κ corresponds to the sphere/pseudosphere with the radius r 0 , and n 0 > 0. Apart from applications in cloaking and perfect imaging phenomena [2][3][4], Maxwell fish eye is a common profile in quantum optics with single atoms and photons [6], optical resonators [7], discrete spectrum radiation [5] etc. Moreover, there are many experimental implementations of the Maxwell fish eye lenses [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Maxwell fish eye for polarized light

Davtyan,

Gevorkian,

Nersessian

2021

Preprint

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We consider the propagation of polarized light in the medium with Maxwell fish eye refraction index profile. We show that polarization violates the additional symmetries of medium, so that ray trajectories no longer remain closed. Then we suggest a modified, polarization-dependent Maxwell fish eye refraction index which restores all symmetries of initial profile and yields closed trajectories of polarized light. Explicit expressions for the polarization dependent integrals of motion and the solutions of corresponding ray trajectories are presented.

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Section: Introductionmentioning

confidence: 99%

Maxwell fish eye for polarized light

Davtyan,

Gevorkian,

Nersessian

2021

Preprint

Self Cite

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forge: the f(R)-gravity cosmic emulator project – I. Introduction and matter power spectrum emulator

Arnold

Giblin

et al. 2022

Monthly Notices of the Royal Astronomical Society

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We present a large suite of cosmological simulations, the forge (F-of-R Gravity Emulator) simulation suite, which is designed to build accurate emulators for cosmological observables in galaxy clustering, weak gravitational lensing, and galaxy clusters for the f(R)-gravity model. A total of 200 simulations explore the cosmological parameter space around a standard Planck cosmology with a Latin hypercube, for 50 combinations of $\bar{f}_{R0}$, Ωm, σ8, and h with all other parameters fixed. For each parameter combination, or node, we ran four independent simulations, one pair using 10243 particles in $500\, h^{-1}\, \mathrm{Mpc}$ simulation boxes to cover small scales, and another pair using 5123 simulation particles in $1.5\, h^{-1}\, \mathrm{Gpc}$ boxes for larger scales. Each pair of initial conditions is selected such that sample variance on large scales is minimized on average. In this work we present an accurate emulator for the matter power spectrum in f(R) gravity trained on forge. We have verified, using the cross-validation technique, that the emulator accuracy is better than $2.5{{\, \rm per\, cent}}$ for the majority of nodes, particularly around the centre of the explored parameter space, up to scales of $k = 10\, h \, \mathrm{Mpc}^{-1}$. We have also checked the power spectrum emulator against simulations that are not part of our training set and found excellent agreement. Due to its high accuracy on small scales, the forge matter power spectrum emulator is well suited for weak-lensing analysis and can play a key tool in constraining f(R) gravity using current and future observational data.

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`matryoshka` II: accelerating effective field theory analyses of the galaxy power spectrum

Donald-McCann

Koyama

Beutler

2022

Monthly Notices of the Royal Astronomical Society

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In this paper we present an extension to the matryoshka suite of neural-network-based emulators. The new editions have been developed to accelerate EFTofLSS analyses of galaxy power spectrum multipoles in redshift space. They are collectively referred to as the EFTEMU. We test the EFTEMU at the power spectrum level and achieve a prediction accuracy of better than 1% with BOSS-like bias parameters and counterterms on scales 0.001 h Mpc−1 ≤ k ≤ 0.19 h Mpc−1. We also run a series of mock full shape analyses to test the performance of the EFTEMU when carrying out parameter inference. Through these mock analyses we verify that the EFTEMU recovers the true cosmology within 1σ at several redshifts (z = [0.38, 0.51, 0.61]), and with several noise levels (the most stringent of which is Gaussian covariance associated with a volume of 50003 Mpc3 h−3). We compare the mock inference results from the EFTEMU to those obtained with a fully analytic EFTofLSS model and again find no significant bias, whilst speeding up the inference by three orders of magnitude. The EFTEMU is publicly available as part of the matryoshkaPython package.

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Discrete spectrum radiation from a charged particle moving in a medium with Maxwell's fish-eye refraction-index profile

Cited by 8 publications

References 15 publications

Maxwell fish eye for polarized light

Maxwell fish eye for polarized light

forge: the f(R)-gravity cosmic emulator project – I. Introduction and matter power spectrum emulator

`matryoshka` II: accelerating effective field theory analyses of the galaxy power spectrum

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Discrete spectrum radiation from a charged particle moving in a medium with Maxwell's fish-eye refraction-index profile

Cited by 8 publications

References 15 publications

Maxwell fish eye for polarized light

Maxwell fish eye for polarized light

forge: the f(R)-gravity cosmic emulator project – I. Introduction and matter power spectrum emulator

matryoshka II: accelerating effective field theory analyses of the galaxy power spectrum

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Product

Resources

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`matryoshka` II: accelerating effective field theory analyses of the galaxy power spectrum