Skip to main content
Overview
I am an Astronomer, and a Physicist; in short I am an astrophysicist. I am an Assistant Professor in the Astrophysics and Gravitation group at the Department of Physics and Astronomy University of Waterloo . I am also an Associate Faculty in the Cosmology group at the Perimeter Institute for Theoretical Physic (PI) . I dabble in Astrophysics, Cosmology, and Physics of gravity. I am obsessed with observational hints that could help address problems in fundamental physics. In particular, I have found anomalous signatures of dark energy and dark baryons in the cosmic microwave background radiation. With other collaborators, I have also developed a curious theory for an incompressible dark energy, named cuscuton (after the Latin name for the parasitic plant of dodder ). I am currently trying my hand in solving the cosmological constant problem through a new theory of gravity that can surprisingly relate the formation of astrophysical black holes to today's acceleration of cosmic expansion . In a related inquiry, I am also exploring the relation of cuscuton and quantum gravity .
Teaching Affiliations
If you are interested in pursuing a MSc degree, please apply to the Perimeter Scholars International (PSI) masters program. If you are interested in working with me as a PhD student, please submit an application directly to my department at the University of Waterloo and indicate that you would like to be supervised by me. Perimeter Institute is committed to diversity within its community and I welcome applications from underrepresented groups.
Research Interests
Astrophysics, Cosmology, Physics of Gravity, Dark Energy, Dark Matter, Clusters of Galaxies, Structure Formation, Accretion Disks, Cosmic Microwave Background, Missing Baryons, Quantum Field Theory, Quantum Gravity, Lorentz Violation, Black Holes, Neutron Stars, Early Universe, Primordial Magnetic Field, Foundations of Quantum Mechanics, Gravitational Wave Astronomy, Pulsar Timing, COVID-19 Epidemiology, Medical Physics and Radiotherapy
Positions Held
  • Professor of Physics and Astronomy, Department of Physics and Astronomy, University of Waterloo, 2022-present
  • Associate Professor of Physics and Astronomy, Department of Physics and Astronomy, University of Waterloo, 2015-2022
  • Assistant Professor of Physics and Astronomy, Department of Physics and Astronomy, University of Waterloo, 2009-2015
  • Postdoctoral Researcher, Perimeter Institute for Theoretical Physics, 2007-2009
  • ITC Postdoctoral Fellow, Institute for Theory and Computation (ITC), Harvard College Observatory, Harvard University, 2004-2007
  • Graduate Student, Department of Astrophysical Sciences, Princeton University, 2000-2004
Awards
  • 10 Top Science Books of 2025, Smithsonian Magazine, 2025
  • Interdisciplinary Trailblazer Fund "Quantum Spacetime in the Cosmos: From Conception to Reality", University of Waterloo, 2022-2024
  • HQP Pooled Resources Competition, Arthur B. McDonald Institute, 2021-2022
  • Discovery Grant "Novel Astrophysical Windows into Fundamental Physics: From Big Bang to Black Holes, and the Dark Universe", Natural Sciences and Engineering Research Council of Canada (NSERC), 2020-2025
  • Buchalter Cosmology Prize, 1st Place, Dr. Ari Buchalter, 2019
  • Buchalter Cosmology Prize, 3rd Place, Dr. Ari Buchalter, 2015
  • Early Researcher Award, Ministry of Research and Innovation, Province of Ontario, Canada, 2011
  • Professor M. K. Vainu Bappu Gold Medal 2008, Astronomical Society of India, 2008
Recent Publications
  • Afshordi, N., Halper, P., Rini, M., & Schirber, M. (2026). Big Mysteries Survey: Physicists' Views on Cosmology, Black Holes, Quantum Mechanics, and Quantum Gravity.
  • Afshordi, N., Halper, P., Rini, M., & Schirber, M. (2026). Far from Settled: Respondents at Odds over Greatest Physics Mysteries. Physics, 19, 34. doi:10.1103/physics.19.34
  • Tang, R., Faraji, S., & Afshordi, N. (2026). Exploring Born-Infeld f(T) teleparallel gravity through accretion disk dynamics. doi:10.48550/arxiv.2502.03775
  • Berti, E., Cardoso, V., Carullo, G., Albanesi, S., Baibhav, V., Bhagwat, S., . . . Abedi, J. (2026). Black hole spectroscopy: from theory to experiment. Classical and Quantum Gravity. doi:10.1088/1361-6382/ae59e2
  • Liu, R., Quintin, J., & Afshordi, N. (2026). Ultraviolet Completion of the Big Bang in Quadratic Gravity. Physical Review Letters, 136(11), 111501. doi:10.1103/6gtx-j455
  • Faraji, S., & Afshordi, N. (2026). Self-regularized entropy: What does black hole entropy predict for tests of Kerr no-hair theorem?. doi:10.48550/arxiv.2508.20421
  • Afshordi, N., Akçay, S., Seoane, P. A., Antonelli, A., Aurrekoetxea, J. C., Barack, L., . . . Vañó-Viñuales, A. (2025). Waveform modelling for the Laser Interferometer Space Antenna. Living Reviews in Relativity, 28(1), 9. doi:10.1007/s41114-025-00056-1
  • Berti, E., Cardoso, V., Carullo, G., Abedi, J., Afshordi, N., Albanesi, S., . . . Zhu, H. (2025). Black hole spectroscopy: from theory to experiment. doi:10.48550/arxiv.2505.23895
  • Yang, J., Afshordi, N., Torabian, M., Jafari, S. A., & Baskaran, G. (2025). Smart holes: analogue black holes with the right temperature and entropy. Journal of High Energy Physics, 2025(7), 226. doi:10.1007/jhep07(2025)226
  • Chen, A., & Afshordi, N. (2025). Where are all the dark galaxies? Predicting galaxy/halo locations from their bright neighbors. doi:10.48550/arxiv.2507.01814
  • Rädler, M., Afshordi, N., Taleei, R., Parodi, K., Abolfath, R., & Lascaud, J. (2025). A semiclassical model of the immediate temperature distribution surrounding the track of heavy ions with therapeutic energies. Physics in Medicine and Biology, 70(11), 115010. doi:10.1088/1361-6560/add83b
  • Afshordi, N., & Halper, P. (2025). Battle of the Big Bang (1 ed.). J. Calamia (Ed.), Chicago, IL, USA: University of Chicago Press. https://press.uchicago.edu/ucp/books/book/chicago/B/bo244963115.html
  • Chen, A. Y., Halper, P., & Afshordi, N. (2025). Copenhagen Survey on Black Holes and Fundamental Physics. doi:10.48550/arxiv.2503.15776
  • Friedman-Shaw, B., Krolewski, A., Foglieni, M., & Afshordi, N. (2025). Doppler bias: impact of peculiar velocities on color selection and the large scale structure of galaxy surveys. Journal of Cosmology and Astroparticle Physics, 2025(03), 059. doi:10.1088/1475-7516/2025/03/059
  • Liu, R., Quintin, J., & Afshordi, N. (2025). Conformal cores of quantum black holes in quadratic gravity. Physical Review D, 111(4), 044031. doi:10.1103/physrevd.111.044031
  • Dailey, C., Schnetter, E., & Afshordi, N. (2025). Formulating the complete initial boundary value problem in numerical relativity to model black hole echoes. Classical and Quantum Gravity, 42(2), 025002. doi:10.1088/1361-6382/ad9701
  • Goel, L., Patterson, E. A., Preciado-Rivas, M. R., Torabian, M., Mann, R. B., & Afshordi, N. (2025). Accelerated detector in a superposed spacetime. Physical Review D, 111(2), 025015. doi:10.1103/physrevd.111.025015
  • Afshordi, N., & Liberati, S. (2025). Quantum black holes: from regularization to information paradoxes. General Relativity and Gravitation, 57(1), 25. doi:10.1007/s10714-025-03356-7
  • Altamirano, N., Gould, E., Afshordi, N., & Mann, R. B. (2025). Cosmic Bubbles and the 5D Holographic Big Bang Model. In Touring the Planck Scale (Vol. 219, pp. 205-229). Springer Nature. doi:10.1007/978-3-031-76066-2_10
  • Wen, R. Y., Hergt, L. T., Afshordi, N., & Scott, D. (2025). A Glitch in Gravity: Cosmic Lorentz-Violation from Fiery Big Bang to Glacial Heat Death. In The Relativistic Universe: From Classical to Quantum (Vol. 61, pp. 435-446). Springer Nature. doi:10.1007/978-3-031-90186-7_35
  • Sajadian, S., & Afshordi, N. (2024). Simulating Self-lensing and Eclipsing Signals due to Detached Compact Objects in the TESS Light Curves. The Astronomical Journal, 168(6), 298. doi:10.3847/1538-3881/ad7fdd
  • Abolfath, R., Afshordi, N., Rahvar, S., van Duin, A. C. T., Rädler, M., Taleei, R., . . . Mohan, R. (2024). A molecular dynamics simulation framework for investigating ionizing radiation-induced nano-bubble interactions at ultra-high dose rates. The European Physical Journal D, 78(11), 141. doi:10.1140/epjd/s10053-024-00928-1
  • Afshordi, N., Ashtekar, A., Barausse, E., Berti, E., Brito, R., Buoninfante, L., . . . Wald, R. M. (2024). Black Holes Inside and Out 2024: visions for the future of black hole physics. doi:10.48550/arxiv.2410.14414
  • Sajadian, S., & Afshordi, N. (2024). Simulating Self-Lensing and Eclipsing Signals due to Detached Compact Objects in the TESS Light Curves. doi:10.48550/arxiv.2409.12441
  • Li, Y., Liu, R., Dailey, C., & Afshordi, N. (2024). Detecting cosmological scalar fields using orbital networks of quantum sensors. doi:10.48550/arxiv.2311.17873
  • Li, Y., Liu, R., Dailey, C., & Afshordi, N. (2024). Detecting cosmological scalar fields using orbital networks of quantum sensors. Physical Review D, 110(4), 043028. doi:10.1103/physrevd.110.043028
  • Borissova, J. N., Held, A., & Afshordi, N. (2023). Scale-invariance at the core of quantum black holes. Classical and Quantum Gravity, 40(7), 075011. doi:10.1088/1361-6382/acbc60
  • Oshita, N., & Afshordi, N. (2023). From entropy to echoes: Counting the quasi-normal modes and the quantum limit of silence. Physics Letters B, 841, 137901. doi:10.1016/j.physletb.2023.137901
  • Chen, A. Y., & Afshordi, N. (2023). Outskirts of dark matter haloes. Physical Review D, 107(10), 103526. doi:10.1103/physrevd.107.103526
  • Dailey, C., Afshordi, N., & Schnetter, E. (2023). Reflecting boundary conditions in numerical relativity as a model for black hole echoes. Classical and Quantum Gravity, 40(19), 195007. doi:10.1088/1361-6382/acde2f
  • Abedi, J., Micchi, L. F. L., & Afshordi, N. (2023). GW190521: Search for echoes due to stimulated Hawking radiation from black holes. Physical Review D, 108(4), 044047. doi:10.1103/physrevd.108.044047
  • Mylova, M., & Afshordi, N. (2023). Effective Cuscuton Theory. doi:10.48550/arxiv.2312.06066
  • Wu, D., Gao, P., Ren, J., & Afshordi, N. (2023). Model-independent search for the quasinormal modes of gravitational wave echoes. Physical Review D, 108(12), 124006. doi:10.1103/physrevd.108.124006
  • Dey, R., Micchi, L. F. L., Mukherjee, S., & Afshordi, N. (2024). Spectrogram correlated stacking: A novel time-frequency domain analysis of the stochastic gravitational wave background. Physical Review D, 109(2), 023029. doi:10.1103/physrevd.109.023029
  • Wen, R. Y., Hergt, L. T., Afshordi, N., & Scott, D. (2024). A cosmic glitch in gravity. Journal of Cosmology and Astroparticle Physics, 2024(03), 045. doi:10.1088/1475-7516/2024/03/045
  • Mylova, M., & Afshordi, N. (2024). Effective cuscuton theory. Journal of High Energy Physics, 2024(4), 144. doi:10.1007/jhep04(2024)144
Seminars
  • Opening Remarks, Cosmological Frontiers in Fundamental Physics 2026, 2026/04/27, PIRSA:26040060
  • Lecture - Cosmology, PHYS 621, Cosmology (Elective), PHYS 621, February 23 - March 27, 2026, 2026/03/17, PIRSA:26030038
  • Lecture - Cosmology, PHYS 621, Cosmology (Elective), PHYS 621, February 23 - March 27, 2026, 2026/03/13, PIRSA:26030037
  • Battle of the Big Bang and other Adventures in Modern Cosmology, WCA public talk series, Kitchener Public Library, Kitchener, ON, Canada, 2026/02/25
  • Battle of the Big Bang, Physics Colloquium, Howard University, Physics and Astronomy, Washington, United States, 2026/01/07
  • Quantum Gravity in the Wild, MannFest at 70, University of Waterloo, Waterloo, Canada, 2025/12/16
  • Quantum Gravity in the Wild, Rethinking Cosmology, Raman Research Institute, Bengaluru, India, 2025/12/11
  • Quantum Black Holes in the Sky, 50 years of the Black Hole Information Paradox, Simons Center for Geometry and Physics, Stony Brook, United States, 2025/11/03
  • Battle of the Big Bang: New Tales of our Cosmic Origins, Physics Colloquium Series, University of Edinburgh, Physics, Edinburgh, United Kingdom, 2025/10/24, Video URL
  • UV-Completing the Universe in Quadratic Gravity, Dublin Institute For Advanced Studies, Dublin, Ireland, 2025/10/23
  • Battle of the Big Bnag, Virtual seminar series, Secular AZ, AZ, United States, 2025/10/08
  • Battle of the Big Bang, Public Lecture Series, Royal Institution of Great Britain, London, United Kingdom, 2025/06/28, Video URL
  • UV-Completing the Universe in Quadratic Gravity, Kings College, London, Physics, London, United Kingdom, 2025/06/27
  • UV-Completing the Universe in Quadratic Gravity, Imperial College London, Physics, London, United Kingdom, 2025/06/26
  • Tempus Discretum: On the nature of cosmic time, Lee's Fest: Quantum Gravity and the Nature of Time, 2025/06/04, PIRSA:25060046
  • Battle of the Big Bang: The New Tales of Our Cosmic Origins, Public Lecture Series, 2025/06/04, PIRSA:25060061
  • Battle of the Big Bnag, Ottawa Intellectual Dialogue, 2025/05/15
  • Copenhagen Survey on Black Holes and Fundamental Physics, Institute for Research in Fundamental Sciences, Physics, Tehran, Iran, 2025/04/16
  • Quantum Causality & the Crisis in Physics: Black Holes, the Big Bang, and Beyond, Sydney CPPC seminar, Sydney, Australia, 2025/02/27, Video URL
  • Quantum Black Holes & the Conundrum of Cosmic Causality, Arizona State University, Physics, Tempe, United States, 2025/01/30, Video URL
  • Quantum Black Holes & the Conundrum of Cosmic Causality, McMaster University, Physics and Astronomy, Hamilton, Canada, 2025/01/22
  • Quantum Black Holes & the Conundrum of Cosmic Causality, Institute of High Energy Physics, Beijing, China, 2024/11/07
  • Quantum Black Holes & the Conundrum of Cosmic Causality, University of Chinese Academy of Sciences, Beijing, China, 2024/11/05
  • Quantum Black Holes (concluding panel discussion, and wrap-up)., Black Holes Inside Out, Niels Bohr Institute, Copenhagen, Denmark, 2024/08/30, Video URL
  • Imaging Quantum Black Holes & (Towards) Optimal Estimators of Stochastic Gravitational Wave Background, Tsinghua University's first Relativity conference, Tsinghua University, Beijing, China, 2024/07/24
  • Quantum Spacetime in the Sky: From the horizon to horizon, Beijing Institute of Mathematical Sciences and Applications, Beijing, China, 2024/07/22, Video URL
  • Quantum Black Holes in the Sky, The Event Horizon and Beyond, Celebrating 50 years of Narayan, Harvard University, Cambridge, United States, 2024/06/12
  • The Big Picture, University College London, London, United Kingdom, 2024/04/15
  • Quantum Spacetime in the Sky: from the horizon to the vacuum, Heising-Simons Foundation (HSF) Collaboration on Quantum Gravity and Its Observational Signatures (QuRIOS), Virtual Journal Club, 2024/04/10
  • Precision Quantum Cosmology, Gravity and Cosmology 2024 https://www2.yukawa.kyoto-u.ac.jp/~gc2024/index.php, Yukawa Institute for Theoretical Physics, Kyoto, Japapn, 2024/02/20
  • Quantum Spacetime in the Sky, Bottom-Up Cross-Cutting Workshop “JENAS Initiative: Gravitational Wave Probes of Fundamental Physics” 12-16 Feb, 2024, Sapienza University of Rome, Rome, Italy, 2024/02/13
  • Quantum Spacetime in the Sky: From Conception to Reality, International Symposium on Recent Developments in Relativistic Astrophysics, Dec 11-13, 2023, Sikkim University, Gangtok, India, 2023/12/13
  • Quantum Spacetime and the Cosmic Endgame, Physics Colloquium, Simon Fraser University, Burnaby, Canada, 2023/11/24