Black Hole Gravitational Wave Research

Dynamical systems, celestial mechanics, black hole quasinormal modes, and mathematical physics.

Research Overview

My research explores mathematical structures arising in celestial mechanics, dynamical systems, differential equations, and gravitational-wave physics. Much of my recent work concerns black hole quasinormal modes: the characteristic oscillations predicted by mathematical models of black holes.

I earned my Ph.D. in Mathematics from the University of Minnesota, where I worked with Rick Moeckel on relative equilibria in celestial mechanics. My current research connects differential equations, spectral questions, numerical methods, and the mathematical modeling of black hole perturbations.

Featured Research Direction

Black hole quasinormal modes are the characteristic ringing frequencies that appear in mathematical models of perturbed black holes. They are important in gravitational wave research because they help connect observed waveforms to the structure of the underlying spacetime.

A central theme in my recent work is the behavior of quasinormal modes for black hole effective potentials. These problems involve imposing physically meaningful boundary conditions on differential equations and studying the resulting complex frequencies.

Animation showing approximations to black hole quasinormal mode frequencies

These questions sit at the intersection of mathematical physics, numerical analysis, spectral theory, and gravitational-wave astronomy.

Publications

Selected publications and preprints are listed below. Links open the publication, preprint, or journal page when available. BibTeX links generate downloadable citation files.

2026

Title Authors Journal / Venue Links Synopsis
Asymptotic quasinormal modes, echoes, and black hole spectral instability: a brief review Shui-Fa Shen and Guan-Ru Li and Ramin G. Daghigh and Jodin C. Morey and Michael D. Green and Wei-Liang Qian and Rui-Hong Yue International Journal of Modern Physics D BibTeX DOI / Journal
Synopsis:
Continued fraction method for high overtone quasinormal modes in effective potentials with discontinuity Guan-Ru Li and Jodin C. Morey and Wei-Liang Qian and Ramin G. Daghigh and Michael D. Green and Kai Lin and Rui-Hong Yue Preprint (submitted) BibTeX Link —
On the Hyperboloidal Foliation for Black Hole Quasinormal Modes Ramin G. Daghigh and Michael D. Green and Jodin C. Morey European Physical Journal C BibTeX DOI / Journal —
On the instability of the fundamental mode of the Regge-Wheeler effective potential Shui-Fa Shen and Guan-Ru Li and Ramin G. Daghigh and Jodin C. Morey and Michael D. Green and Qiyuan Pan and Cheng-Gang Shao and Wei-Liang Qian Preprint (submitted) BibTeX Link —

2025

Title Authors Journal / Venue Links Synopsis
Regge poles, grey body factors, and absorption cross sections for black hole metrics with discontinuity Guan-Ru Li and Wei-Liang Qian and Qiyuan Pan and Ramin G. Daghigh and Jodin C. Morey and Rui-Hong Yue Physical Review D BibTeX Link
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2024

Title Authors Journal / Venue Links Synopsis
Back to the Books: Navigating Grad School as a Mature Student Jodin Morey MAA Math Values Blog BibTeX Link —
Calculating quasinormal modes of extremal and non-extremal Reissner-Nordstrom black holes with the continued fraction method Ramin G. Daghigh and Michael D. Green and Jodin C. Morey Physical Review D BibTeX DOI / Journal
Synopsis:
Relative Equilibria of Pinwheel Point Mass Systems in a Planar Gravitational Field Ritwik Gaur Rose-Hulman Undergraduate Mathematics Journal BibTeX Link —

2023

Title Authors Journal / Venue Links Synopsis
Calculating quasinormal modes of Schwarzschild anti-de Sitter black holes using the continued fraction method Ramin G. Daghigh and Michael D. Green and Jodin C. Morey Physical Review D BibTeX DOI / Journal
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2022

Title Authors Journal / Venue Links Synopsis
Relative Equilibria of Dumbbells Orbiting in a Planar Newtonian Gravitational System Jodin Morey PhD thesis BibTeX Link
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2020

Title Authors Journal / Venue Links Synopsis
Scalar perturbations of a single-horizon regular black hole Ramin G. Daghigh and Michael D. Green and Jodin C. Morey and Gabor Kunstatter Physical Review D BibTeX DOI / Journal
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Significance of black hole quasinormal modes: A closer look Ramin G. Daghigh and Michael D. Green and Jodin C. Morey Physical Review D BibTeX DOI / Journal
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2016

Title Authors Journal / Venue Links Synopsis
The Consequence of Using a Quantum Two-State Magnetic Field in a Stern-Gerlach Experiment Ramin G. Daghigh and Michael D. Green and Jodin C. Morey and Christopher J. West Preprint BibTeX Link
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2014

Title Authors Journal / Venue Links Synopsis
Environmental sustainability curriculum for college algebra and pre-calculus Jodin Morey Engaging Mathematics BibTeX Link
Synopsis (Monarch):
Synopsis (Greenhouse):

Research Areas

Black Hole Gravitational Waves

My colleagues and I study mathematical models of black holes and calculate the characteristic wave behavior predicted by those models. These problems involve differential equations, boundary conditions, complex frequencies, and numerical methods.

Illustration related to black hole gravitational waves

Celestial Mechanics and the Two-Body Problem

My doctoral work studied relative equilibria in gravitational systems where bodies are modeled by collections of masses connected by rods. This approach can be used to understand the behavior of irregularly shaped objects such as asteroids.

Illustration related to the two-body problem

Environmental Sustainability

In earlier work, I developed and presented sustainability-related mathematics curriculum for college algebra and pre-calculus. This work included projects comparing greenhouse gases produced by automobile fuel choices and studying the impact of farming practices on monarch butterfly populations.

ORCID: https://orcid.org/0000-0001-5578-7881

ORCID provides a persistent researcher identifier that helps connect publications, professional activities, and scholarly records.