Zobrazeno 1 - 10
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pro vyhledávání: '"Jow, Dylan L."'
Autor:
Jow, Dylan L., Pen, Ue-Li
The recent discovery of ultra-long wavelength gravitational waves through the advent of pulsar timing arrays (PTA) has opened up new avenues for fundamental science. Here we show that every PTA source will be diffractively lensed by potentially hundr
Externí odkaz:
http://arxiv.org/abs/2407.03214
We describe a new phenomenon in the study of the real-time path integral, where complex classical paths hit singularities of the potential and need to be analytically continued beyond the space for which they solve the boundary value problem. We show
Externí odkaz:
http://arxiv.org/abs/2309.12427
The real-time propagator of the symmetric Rosen-Morse, also known as the symmetric modified P\"oschl-Teller, barrier is expressed in the Picard-Lefschetz path integral formalism using real and complex classical paths. We explain how the interference
Externí odkaz:
http://arxiv.org/abs/2309.12420
We consider the refractive lensing effects of ionized cool ($T \sim 10^4\,{\rm K}$) gas cloudlets in the circumgalactic medium (CGM) of galaxies. In particular, we discuss the combined effects of lensing from these cloudlets and scintillation from pl
Externí odkaz:
http://arxiv.org/abs/2309.07256
We propose a novel means of directly measuring cosmological distances using scintillated microlensing of fast radio bursts (FRBs). In standard strong lensing measurements of cosmic expansion, the main source of systematic uncertainty lies in modeling
Externí odkaz:
http://arxiv.org/abs/2308.10830
The scattering structures in the ISM responsible for so-called ``extreme scattering events" (ESEs), observed in quasars and pulsars, remain enigmatic. Current models struggle to explain the high-frequency light curves of ESEs, and a recent analysis o
Externí odkaz:
http://arxiv.org/abs/2301.08344
Astrophysical lensing has typically been studied in two regimes: diffractive optics and refractive optics. Diffractive optics is characterized by a perturbative expansion of the Kirchhoff-Fresnel diffraction integral, while refractive optics is chara
Externí odkaz:
http://arxiv.org/abs/2204.12004
Autor:
Jow, Dylan L., Pen, Ue-Li
Compact radio sources have been observed to undergo large, frequency dependent changes in intensity due to lensing by structures in the interstellar medium, in so-called "extreme scattering events" (ESEs). While the study of astrophysical plasma lens
Externí odkaz:
http://arxiv.org/abs/2110.07119
The study of astrophysical plasma lensing, such as in the case of extreme scattering events, has typically been conducted using the geometric limit of optics, neglecting wave effects. However, for the lensing of coherent sources such as pulsars and f
Externí odkaz:
http://arxiv.org/abs/2103.08687
Wave effects are often neglected in microlensing studies; however, for coherent point-like sources, such as pulsars and fast radio bursts (FRBs), wave effects will become important in their gravitational lensing. In this paper, we describe the wave o
Externí odkaz:
http://arxiv.org/abs/2002.01570