Dylan L. Jow
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View article: Investigating the Sightline of a Highly Scattered Fast Radio Burst through a Cosmic Sheet Structure in the Local Universe
Investigating the Sightline of a Highly Scattered Fast Radio Burst through a Cosmic Sheet Structure in the Local Universe Open
Fast radio bursts (FRBs) are unique probes of extragalactic ionized baryonic structure as each signal, through its burst properties, holds information about the ionized matter it encounters along its sightline. FRB 20200723B is a burst wit…
View article: A Unified Model of Cosmic-Ray Propagation and Radio Extreme Scattering Events from Intermittent Interstellar Structures
A Unified Model of Cosmic-Ray Propagation and Radio Extreme Scattering Events from Intermittent Interstellar Structures Open
Intermittent magnetic structures are a plausible candidate for explaining cosmic-ray (CR) diffusion rates derived from observed CR energy spectra. Independently, studies of extreme scattering events (ESEs) of radio quasars and pulsar scint…
View article: Complex classical paths in quantum reflections and tunneling
Complex classical paths in quantum reflections and tunneling Open
The real-time propagator of the symmetric Rosen-Morse, also known as the symmetric modified Pöschl-Teller, barrier is expressed in the Picard-Lefschetz path integral formalism using real and complex classical paths. We explain how the inte…
View article: A Unified Model of Cosmic Ray Propagation and Radio Extreme Scattering Events from Intermittent Interstellar Structures
A Unified Model of Cosmic Ray Propagation and Radio Extreme Scattering Events from Intermittent Interstellar Structures Open
Intermittent magnetic structures are a plausible candidate for explaining cosmic-ray (CR) diffusion rates derived from observed CR energy spectra. Independently, studies of extreme scattering events (ESEs) of radio quasars and pulsar scint…
View article: Refractive lensing of scintillating FRBs by subparsec cloudlets in the multiphase CGM
Refractive lensing of scintillating FRBs by subparsec cloudlets in the multiphase CGM Open
We consider the refractive lensing effects of ionized cool ( ) gas cloudlets in the circumgalactic medium (CGM) of galaxies. In particular, we discuss the combined effects of lensing from these cloudlets and scintillation from plas…
View article: Measuring cosmic expansion with diffractive gravitational scintillation of nanoHertz gravitational waves
Measuring cosmic expansion with diffractive gravitational scintillation of nanoHertz gravitational waves Open
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 potent…
View article: On the cusp of cusps: a universal model for extreme scattering events in the ISM
On the cusp of cusps: a universal model for extreme scattering events in the ISM Open
The scattering structures in the interstellar medium 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,…
View article: Complex classical paths in quantum reflections and tunneling
Complex classical paths in quantum reflections and tunneling Open
The real-time propagator of the symmetric Rosen-Morse, also known as the symmetric modified Pöschl-Teller, barrier is expressed in the Picard-Lefschetz path integral formalism using real and complex classical paths. We explain how the inte…
View article: Crossing singularities in the saddle point approximation
Crossing singularities in the saddle point approximation Open
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 probl…
View article: Refractive lensing of scintillating FRBs by sub-parsec cloudlets in the multi-phase CGM
Refractive lensing of scintillating FRBs by sub-parsec cloudlets in the multi-phase CGM Open
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 scintillat…
View article: Scintillated microlensing: measuring cosmic distances with fast radio bursts
Scintillated microlensing: measuring cosmic distances with fast radio bursts Open
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 …
View article: Regimes in astrophysical lensing: refractive optics, diffractive optics, and the Fresnel scale
Regimes in astrophysical lensing: refractive optics, diffractive optics, and the Fresnel scale Open
Astrophysical lensing has typically been studied in two regimes: diffractive optics and refractive optics. Previously, it has been assumed that the Fresnel scale, RF, is the relevant physical scale that separates these two regimes. With th…
View article: On the cusp of cusps: a universal model for extreme scattering events in the ISM
On the cusp of cusps: a universal model for extreme scattering events in the ISM Open
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…
View article: Measuring lens dimensionality in extreme scattering events through wave optics
Measuring lens dimensionality in extreme scattering events through wave optics Open
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 …
View article: Regimes in astrophysical lensing: refractive optics, diffractive optics, and the Fresnel scale
Regimes in astrophysical lensing: refractive optics, diffractive optics, and the Fresnel scale Open
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 opti…
View article: Imaginary images and Stokes phenomena in the weak plasma lensing of coherent sources
Imaginary images and Stokes phenomena in the weak plasma lensing of coherent sources Open
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 pu…
View article: Wave effects in the microlensing of pulsars and FRBs by point masses
Wave effects in the microlensing of pulsars and FRBs by point masses Open
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…
View article: Evaporating evidence for Hawking points in the CMB
Evaporating evidence for Hawking points in the CMB Open
We investigate recent claims for a detection of (positions on the sky with unusually large temperature gradients between rings) in the cosmic microwave background (CMB) temperature maps at the 99.98% confidence level. We find that, after…
View article: An application of an optimal statistic for characterizing relative orientations
An application of an optimal statistic for characterizing relative orientations Open
We present the projected Rayleigh statistic (PRS), a modification of the classic Rayleigh statistic, as a test for non-uniform relative orientation between two pseudo-vector fields. In the application here this gives an effective way of in…