Niayesh Afshordi

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

Positions Held

• 2015- now Department of Physics and Astronomy, University of Waterloo Associate Professor of Physics and Astronomy
• 2009-2015 Department of Physics and Astronomy, University of Waterloo Assistant Professor of Physics and Astronomy
• 2007-2009 Perimeter Institute for Theoretical Physics Distinguished Research Fellow
• 2004 - 2007 Institute for Theory and Computation (ITC), Harvard College Observatory, Harvard University ITC Postdoctoral Fellow
• 2000 - 2004 Department of Astrophysical Sciences, Princeton University Graduate Student

Awards

• Buchalter Cosmology Prize 2015 , 3rd place with Elliot Nelson, 2016
• Early Researcher Award, Ministry of Research and Innovation, Province of Ontario, Canada
• Professor M. K. Vainu Bappu Gold Medal 2008, Astronomical Society of India (jointly with Nissim Kanekar)
• Discovery Accelerator Supplement, Natural Sciences and Engineering Research Council of Canada (NSERC), 2010 (8 awarded across Canada in Physics)
• Distinguished Research Fellowship, Perimeter Institute for Theoretical Physics, Waterloo, Canada

Recent Publications

• Black hole echology: The observer's manual By Qingwen Wang, Niayesh Afshordi. arXiv: 1803.02845 [gr-qc]. 10.1103/PhysRevD.97.124044. Phys.Rev. D97 (2018) no.12, 124044.
• Searching for dark matter annihilation from individual halos: uncertainties, scatter and signal-to-noise ratios By Chiamaka Okoli, James E. Taylor, Niayesh Afshordi. arXiv: 1711.05271 [astro-ph.CO]. 10.1088/1475-7516/2018/08/019. JCAP 1808 (2018) no.08, 019.
• Cosmological Zero Modes By Niayesh Afshordi, Matthew C. Johnson. arXiv: 1708.04694 [astro-ph.CO]. 10.1103/PhysRevD.98.023541. Phys.Rev. D98 (2018) no.2, 023541.
• Constraining holographic cosmology using Planck data By Niayesh Afshordi, Elizabeth Gould, Kostas Skenderis. arXiv: 1703.05385 [astro-ph.CO]. Phys.Rev. D95 (2017) no.12, 123505.
• Accretion in Radiative Equipartition (AiRE) Disks By Yasaman K. Yazdi, Niayesh Afshordi. arXiv: 1609.06716 [astro-ph.HE]. Astrophys.J. 843 (2017) no.1, 22.
• The critical geometry of a thermal big bang By Niayesh Afshordi, Joao Magueijo. arXiv: 1603.03312 [gr-qc]. Phys.Rev. D94 (2016) no.10, 101301.
• Cosmological Tests of Everpresent $\Lambda$ By Nosiphiwo Zwane, Niayesh Afshordi, Rafael D. Sorkin. arXiv: 1703.06265 [gr-qc]. Class.Quant.Grav. (2018) in press
• Dynamical friction in the primordial neutrino sea By Chiamaka Okoli, Morag I. Scrimgeour, Niayesh Afshordi, Michael J. Hudson. arXiv: 1611.04589 [astro-ph.CO]. Mon.Not.Roy.Astron.Soc. 468 (2017) no.2, 2164-2175.
• Off-shell Dark Matter: A Cosmological relic of Quantum Gravity By Mehdi Saravani, Niayesh Afshordi. arXiv: 1604.02448 [gr-qc]. Phys.Rev. D95 (2017) no.4, 043514.
• From Planck data to Planck era: Observational tests of Holographic Cosmology By Niayesh Afshordi, Claudio Coriano, Luigi Delle Rose, Elizabeth Gould, Kostas Skenderis. arXiv: 1607.04878 [astro-ph.CO]. Phys.Rev.Lett. 118 (2017) no.4, 041301.
• Echoes from the Abyss: Tentative evidence for Planck-scale structure at black hole horizons By Jahed Abedi, Hannah Dykaar, Niayesh Afshordi. arXiv: 1612.00266 [gr-qc]. 10.1103/PhysRevD.96.082004. Phys.Rev. D96 (2017) no.8, 082004.
• "Firewall" phenomenology with astrophysical neutrinos By Niayesh Afshordi, Yasaman K. Yazdi. arXiv: 1502.01023 [astro-ph.HE]. Class.Quant.Grav. 33 (2016) no.23, 235017.
• Concentration, Ellipsoidal Collapse, and the Densest Dark Matter haloes By Chiamaka Okoli, Niayesh Afshordi. arXiv: 1510.03868 [astro-ph.CO]. 10.1093/mnras/stv2905. Mon.Not.Roy.Astron.Soc. 456 (2016) no.3, 3068-3078.
• Cosmic Censorship in Lorentz Violating Theories of Gravity By Michael Meiers, Mehdi Saravani, Niayesh Afshordi. arXiv: 1511.08969 [gr-qc]. 10.1103/PhysRevD.93.104008. Phys.Rev. D93 (2016) no.10, 104008.
• A holographic big bang? By N. Afshordi, R.B. Mann, R. Pourhasan. 10.1142/S0218271815440290. Int.J.Mod.Phys. D24 (2015) no.12, 1544029.
• Universal clustering of dark matter in phase space By Jesus Zavala, Niayesh Afshordi. arXiv: 1508.02713 [astro-ph.CO]. 10.1093/mnras/stw048. Mon.Not.Roy.Astron.Soc. 457 (2016) no.1, 986-992.
• Cosmological bounds on TeV-scale physics and beyond By Niayesh Afshordi, Elliot Nelson. arXiv: 1504.00012 [hep-th]. 10.1103/PhysRevD.93.083505. Phys.Rev. D93 (2016) no.8, 083505.
• Schwinger Effect in 4D de Sitter Space and Constraints on Magnetogenesis in the Early Universe, Takeshi Kobayashi, Niayesh Afshordi, JHEP 1410 (2014) 166, arXiv: 1408.4141
• Horndeski meets McVittie: A scalar field theory for accretion onto cosmological black holes, Niayesh Afshordi, Michele Fontanini, Daniel C. Guariento, Phys.Rev. D90 (2014) 8, 084012, arXiv: 1408.5538
• A Non-Local Reality: Is there a Phase Uncertainty in Quantum Mechanics?, Elizabeth S. Gould, Niayesh Afshordi (Perimeter/Waterloo), Found. Physics (2015 in press), arXiv: 1407.4083
• How does pressure gravitate? Cosmological constant problem confronts observational cosmology, Ali Narimani, Niayesh Afshordi, Douglas Scott, JCAP, 08 (2014) 049, arXiv: 1406.0479
• Thermal Tachyacoustic Cosmology, Abhineet Agarwal (Waterloo), Niayesh Afshordi (Perimeter/Waterloo), Phys. Rev. D 90 (2014), 043528, arXiv: 1406.0575
• Emergent Spacetime in Stochastically Evolving Dimensions, Niayesh Afshordi, Dejan Stojkovic, Phys.Lett. B739 (2014) 117-124, arXiv: 1405.3297
• Elcio Abdalla, Niayesh Afshordi, Michele Fontanini, Daniel C. Guariento, Eleftherios Papantonopoulos, Cosmological black holes from self-gravitating fields, Phys. Rev. D 89, 104018 (2014), arXiv: 1312.3682
• Jesus Zavala (1,2,3,4), Niayesh Afshordi (1,2) ((1) PI, (2) UW, (3) CITA, (4) Dark Cosmology Centre), Clustering in the Phase Space of Dark Matter Haloes. II. Stable Clustering and Dark Matter Annihilation, Monthly Notices of the Royal Astronomical Society, 2014, Volume 441, Issue 2, p.1329-1339, arXiv: 1311.3296
• Mehdi Saravani, Niayesh Afshordi, Robert B. Mann, Dynamical Emergence of Universal Horizons during the formation of Black Holes, Phys. Rev. D 89, 084029 (2014), arXiv: 1310.4143
• Transient Weak-Lensing by Cosmological Dark Matter Microhaloes, Sohrab Rahvar, Shant Baghram, Niayesh Afshordi,Phys Rev D 89 (2014), 063001, arXiv: 1310.5412
• Out of the White Hole: A Holographic Origin for the Big Bang, R. Pourhasan, N. Afshordi and R.B.Mann, JCAP, 04 (2014) 005, arXiv: 1309.1487
• Clustering in the Phase Space of Dark Matter Haloes. I. Results from the Aquarius simulations, J.Zavala and N.Afshordi, Monthly Notices of the Royal Astronomical Society, 2014, Volume 441, Issue 2, p.1317-1328, arXiv: 1308.1098
• An Optimal and Model-Independent Measurement of the Intracluster Pressure Profile I: Methodology and First Applications, Siavash Aslanbeigi, Guilhem Lavaux, Amir Hajian, Niayesh Afshordi, Monthly Notices of the Royal Astronomical Society, 2013, Volume 435, Issue 2, p.1788-1808, arXiv: 1304.6457
• Empty Black Holes, Firewalls, and the Origin of Bekenstein-Hawking Entropy, M.Saravani, N.Afshordi and R.B.Mann, Int.J.Mod.Phys. D23 (2015) 13, 1443007, [arXiv: 1212.4176 [hep-th]]
• Removal and mixing of the coronal gas from satellites in galaxy groups: cooling the intragoup gas, Jesus Zavala, Michael L. Balogh, Niayesh Afshordi, Stephen Ro, Mon.Not.Roy.Astron.Soc.,426, 3464, arXiv: 1208.4849 [astro-ph.CO]
• First measurement of the bulk flow of nearby galaxies using the cosmic microwave background. By Guilhem Lavaux, Niayesh Afshordi, Michael J. Hudson, Mon. Not. Roy. Astron. Soc. 430, 1617 [arXiv: 1207.1721 [astro-ph.CO]].
• A Ground State for the Causal Diamond in 2 Dimensions, Niayesh Afshordi, Michel Buck, Fay Dowker, David Rideout, Rafael D. Sorkin, Yasaman K. Yazdi, JHEP, 1210, 088, arxiv:hep-th/1207.7101
• A Distinguished Vacuum State for a Quantum Field in a Curved Spacetime: Formalism, Features, and Cosmology, Niayesh Afshordi, Siavash Aslanbeigi, Rafael D. Sorkin, JHEP 1208 (2012) 137, arxiv:hep-th/1205.1296
• Chameleon Gravity, Electrostatics, and Kinematics in the Outer Galaxy. By R. Pourhasan, N. Afshordi, R.B. Mann, A.C. Davis. [arXiv: 1109.0538 [astro-ph.CO]]. JCAP 1112 (2011) 005.
• Phenomenology of Gravitational Aether as a solution to the Old Cosmological Constant Problem. By Siavash Aslanbeigi, Georg Robbers, Brendan Z. Foster, Kazunori Kohri, Niayesh Afshordi. [arXiv: 1106.3955 [astro-ph.CO]]. Phys.Rev. D84 (2011) 103522.
• Neutron Stars and the Cosmological Constant Problem. By Farbod Kamiab, Niayesh Afshordi. [arXiv: 1104.5704 [astro-ph.CO]]. Phys.Rev. D84 (2011) 063011.
• Prospects for Detecting Dark Matter Halo Substructure with Pulsar Timing, Shant Baghram, Niayesh Afshordi, Kathryn M. Zurek, Physical Review D, vol. 84, Issue 4, id. 043511, arXiv: 1101.5487v2 [astro-ph.CO]
• Niayesh Afshordi, Anze Slosar, Yi Wang, A Theory of a Spot, JCAP 1101:019,2011, arXiv: 1006.5021
• Niayesh Afshordi, Roya Mohayaee, Edmund Bertschinger, Hierarchy in the Phase Space and Dark Matter Astronomy, Phys.Rev. D81 (2010) 10130, arXiv:astro-ph.CO/0911.0414
• Niayesh Afshordi, Reviving Gravity's Aether in Einstein's Universe, Physics in Canada (2010) 66.2, arXiv:physics.pop-ph/1004.2901
• Niayesh Afshordi (Perimeter Institute), Cuscuton and low energy limit of Horava-Lifshitz gravity, Phys.Rev. D80 (2009) 081502, arxiv:hep-th/0907.5201
• Chanda Prescod-Weinstein (Perimeter Institute/U-Waterloo), Niayesh Afshordi (Perimeter Institute), Michael L. Balogh (U-Waterloo), Stellar Black Holes and the Origin of Cosmic Acceleration, Phys. Rev. D 80, 043513 (2009), arxiv:astro-ph.CO/0905.3551
• Niayesh Afshordi, Ghazal Geshnizjani, Justin Khoury (Perimeter Institute), Observational Evidence for Cosmological-Scale Extra Dimensions, JCAP 08 (2009) 030, arXiv: 0812.2244
• Niayesh Afshordi (Perimeter Institute), Roya Mohayaee (IAP), Edmund Bertschinger (MIT), Hierarchical Phase Space Structure of Dark Matter Haloes: Tidal debris, Caustics, and Dark Matter annihilation, Phys. Rev. D 79, 083526 (2009), arxiv:astro-ph/0811.1582
• Marilena LoVerde, Niayesh Afshordi, Extended Limber Approximation, Phys.Rev.D78:123506,2008, arxiv:astro-ph/0809.5112
• Niayesh Afshordi, Andrew J. Tolley (Perimeter Institute), Primordial non-gaussianity, statistics of collapsed objects, and the Integrated Sachs-Wolfe effect, Phys.Rev.D78:123507,2008, arxiv:astro-ph/0806.1046
• Georg Robbers, Niayesh Afshordi, Michael Doran, Does Planck mass run on the cosmological horizon scale?, Phys.Rev.Lett.100:111101,2008, arXiv: 0708.3235
• Niayesh Afshordi (Perimeter/Harvard), Fundamental Plane of Sunyaev-Zeldovich clusters, Astrophys.J. 686 (2008) 201-205, arXiv: 0704.2416
• Niayesh Afshordi (ITC, Harvard), Daniel J.H. Chung (UW-Madison), Michael Doran (Heidelberg), Ghazal Geshnizjani (UW-Madison), Cuscuton Cosmology: Dark Energy meets Modified Gravity, Phys.Rev.D75:123509,2007, arXiv: astro-ph/0702002
• Niayesh Afshordi (ITC, Harvard), Yen-Ting Lin (Princeton/Catolica), Daisuke Nagai (CalTech), Alastair J. R. Sanderson (Birmingham), Missing Thermal Energy of the Intracluster Medium, Mon.Not.Roy.Astron.Soc.378:293-300,2007, arXiv: astro-ph/0612700
• Niayesh Afshordi (ITC, Harvard), How well can (renormalized) perturbation theory predict dark matter clustering properties?, Phys.Rev.D75:021302,2007, arXiv: astro-ph/0610336
• Niayesh Afshordi (ITC, Harvard), Daniel J.H. Chung, Ghazal Geshnizjani (UW-Madison), Cuscuton: A Causal Field Theory with an Infinite Speed of Sound, Phys.Rev.D75:083513,2007, arXiv: hep-th/0609150
• Niayesh Afshordi (Harvard College Observatory), Intracluster Medium through three years of WMAP, NewAstron.Rev.50:905-908,2006, arXiv: astro-ph/0608503
• Niayesh Afshordi, Matias Zaldarriaga (Harvard), Kazunori Kohri (Harvard/Osaka), On the stability of Dark Energy with Mass-Varying Neutrinos, Phys.Rev. D72 (2005) 065024, arXiv: astro-ph/0506663
• Ghazal Geshnizjani, Daniel J.H. Chung (UW-Madison), Niayesh Afshordi (Harvard), Do Large-Scale Inhomogeneities Explain Away Dark Energy?, Phys.Rev. D72 (2005) 023517, arXiv: astro-ph/0503553
• Christopher M. Hirata, Abraham Loeb, Niayesh Afshordi, CMB B-mode polarization from Thomson scattering in the local universe, Phys.Rev. D71 (2005) 063531, arXiv: astro-ph/0501167
• Banibrata Mukhopadhyay, Niayesh Afshordi, Ramesh Narayan (Harvard), Bypass to Turbulence in Hydrodynamic Accretion Disks: An Eigenvalue Approach, Astrophys.J. 629 (2005) 383-396, arXiv: astro-ph/0412193
• Niayesh Afshordi, Banibrata Mukhopadhyay, Ramesh Narayan (ITC/Harvard), Bypass to Turbulence in Hydrodynamic Accretion: Lagrangian Analysis of Energy Growth, Astrophys.J. 629 (2005) 373-382, arXiv: astro-ph/0412194
• Niayesh Afshordi (Harvard/Princeton), Yen-Ting Lin (Illinois), Alastair J.R. Sanderson (Illinois/Birmingham), WMAP constraints on the Intra-Cluster Medium, Astrophys.J. 629 (2005) 1-14, arXiv: astro-ph/0408560
• Ghazal Geshnizjani, Niayesh Afshordi, Coarse-Grained Back Reaction in Single Scalar Field Driven Inflation, JCAP 0501 (2005) 011, arXiv: gr-qc/0405117
• Niayesh Afshordi (Princeton University Observatory), Integrated Sachs-Wolfe effect in Cross-Correlation: The Observer's Manual, Phys.Rev. D70 (2004) 083536, arXiv: astro-ph/0401166
• Niayesh Afshordi, Yeong-Shang Loh, Michael A. Strauss (Princeton University Observatory), Cross-Correlation of the Cosmic Microwave Background with the 2MASS Galaxy Survey: Signatures of Dark Energy, Hot Gas, and Point Sources, Phys.Rev. D69 (2004) 083524, arXiv: astro-ph/0308260
• Geometrically thin disk accreting into a black hole By Niayesh Afshordi, Bohdan Paczynski. astro-ph/0202409. Astrophys.J. 592 (2003) 354-367.
• N. Afshordi, P. McDonald, D.N. Spergel, Primordial Black Holes as Dark Matter: The Power Spectrum and Evaporation of Early Structures, Astrophys.J. 594 (2003) L71-L74, arXiv: astro-ph/0302035
• Mass - temperature relation of galaxy clusters: A Theoretical study By Niayesh Afshordi, Renyue Cen. astro-ph/0105020. Astrophys.J. 564 (2002) 669-682.
• Super Hubble nonlinear perturbations during inflation By Niayesh Afshordi, Robert H. Brandenberger. gr-qc/0011075. Phys.Rev. D63 (2001) 123505.
• A dynamical approach to a selfsimilar universe By E. Abdalla, N. Afshordi, K. Khodjasteh, R. Mohayaee. astro-ph/9803187. Astron.Astrophys. 345 (1999) 22.
• Probing microstructure of black hole spacetimes with gravitational wave echoes By Naritaka Oshita, Niayesh Afshordi. arXiv: 1807.10287 [gr-qc].
• Cooling+Heating Flows in Galaxy clusters: Turbulent heating, spectral modelling, and cold mass budget By Mohammad H. Zhoolideh Haghighi, Niayesh Afshordi, Habib.G. Khosroshahi. arXiv: 1806.08822 [astro-ph.GA].
• Forward modelling of quasar light curves and the cosmological matter power spectrum on milliparsec scales By Mansour Karami, Niayesh Afshordi, Jesús Zavala. arXiv: 1805.06984 [astro-ph.CO].
• Instantaneous Temperatures á la Hadamard: Towards a generalized Stefan-Boltzmann law for curved spacetime By Aditya Dhumuntarao, José Tomás Gálvez Ghersi, Niayesh Afshordi. arXiv: 1804.05382 [gr-qc].
• Comment on: "Low significance of evidence for black hole echoes in gravitational wave data" By Jahed Abedi, Hannah Dykaar, Niayesh Afshordi. arXiv: 1803.08565 [gr-qc].
• Echoes from the Abyss: A highly spinning black hole remnant for the binary neutron star merger GW170817 By Jahed Abedi, Niayesh Afshordi. arXiv: 1803.10454 [gr-qc].
• \"u$\Lambda$CDM: $H_0$ tension as a hint for \"Uber-Gravity By Nima Khosravi, Shant Baghram, Niayesh Afshordi, Natacha Altamirano. arXiv: 1710.09366 [astro-ph.CO].
• Pulsar Timing Constraints on Physics Beyond the Standard Model By Niayesh Afshordi, Hyungjin Kim, Elliot Nelson. arXiv: 1703.05331 [hep-th].
• Cosmological Perturbations in the 5D Holographic Big Bang Model By Natacha Altamirano, Elizabeth Gould, Niayesh Afshordi, Robert B. Mann. arXiv: 1703.00954 [astro-ph.CO].
• Echoes from the Abyss: The Holiday Edition! By Jahed Abedi, Hannah Dykaar, Niayesh Afshordi. arXiv: 1701.03485 [gr-qc].
• Temperatures of renormalizable quantum field theories in curved spacetime By Morgan H. Lynch, Niayesh Afshordi. arXiv: 1611.06619 [gr-qc].
• Why is High Energy Physics Lorentz Invariant? By Niayesh Afshordi. arXiv: 1511.07879 [hep-th].
• The mass and radii of strongly magnetized neutron stars By Farbod Kamiab, Avery E. Broderick, Niayesh Afshordi. arXiv: 1503.03898 [astro-ph.HE].
• Lithium Diffusion in the Post-Recombination Universe and Spatial Variation of [Li/H], Maxim Pospelov, Niayesh Afshordi, arXiv: 1208.0793
• Where will Einstein fail? Lessons for gravity and cosmology By Niayesh Afshordi. arXiv: 1203.3827 [astro-ph.CO]. Bull.Astron.Soc.India 40 (2012) 1.
• Using Dark Matter Haloes to Learn about Cosmic Acceleration: A New Proposal for a Universal Mass Function, C. Prescod-Weinstein, N. Afshordi, arXiv: 1010.5501v1 [astro-ph.CO]
• Bruce A. Bassett, Niayesh Afshordi, The Non-Gaussian Sting in Posteriors arising from Marginal Detections, arXiv: 1005.1664 [astro-ph.CO]
• Niayesh Afshordi, Dark Energy, Black Hole Entropy, and the First Precision Measurement in Quantum Gravity, arXiv: 1003.4811 [hep-th]
• Non-Gaussianity as a Probe of the Physics of the Primordial Universe and the Astrophysics of the Low Redshift Universe By E. Komatsu et al.. arXiv: 0902.4759 [astro-ph.CO].
• Niayesh Afshordi (Perimeter Institute), Gravitational Aether and the thermodynamic solution to the cosmological constant problem, arXiv: 0807.2639
• Physical Evidence for Dark Energy, R. Scranton, A. J. Connolly (UPitt), R. C. Nichol (CMU), A. Stebbins (FNAL), I. Szapudi (Hawaii), D. J. Eisenstein (Steward), N. Afshordi (Princeton), T. Budavari (JHU), I. Csabai (Eotvos), J. A. Frieman (FNAL), J. E. Gunn (Princeton), D. Johnson (CfCP), Y. Loh, R. H. Lupton (Princeton), C. J. Miller (CMU), E. S. Sheldon (CfCP), R. S. Sheth (UPitt), A. S. Szalay (JHU), M. Tegmark, Y. Xu (UPenn), et al. (SDSS collaboration), arXiv: astro-ph/0307335
• Cyclotron emission and thermalization of the CMB spectrum By Niayesh Afshordi. astro-ph/0202082.
• Intracluster Medium through three years of WMAP By Niayesh Afshordi. astro-ph/0608503. 10.1016/j.newar.2006.09.022. New Astron.Rev. 50 (2006) 905-908.
• Growth of hydrodynamic perturbations in accretion disks: Possible route to non-magnetic turbulence By Banibrata Mukhopadhyay, Niayesh Afshordi, Ramesh Narayan. astro-ph/0507046. 10.1016/j.asr.2005.09.048. Adv.Space Res. 38 (2006) 2877.
• Hydrodynamic turbulence in accretion disks By Banibrata Mukhopadhyay, Niayesh Afshordi, Ramesh Narayan. astro-ph/0501468. eConf C041213 (2004) 1609.
• Niayesh Afshordi, Robert C. Mann, Razieh Pourhasan, The Black Hole at the Beginning of Time, Scientific American (August 2014)
• Jesus Zavala, Niayesh Afshordi, P2SAD: Particle Phase Space Average Density, Astrophysics Source Code Library, record ascl:1402.030

Seminars

• "Seeing Cosmic Nanostructure: From Plasma to Dark Matter" -Invited Seminar, Canadian Institute for Theoretical Astrophysics (CITA), University of Toronto
• "Seeing through Simulation Blindspots" -Invited Lecture, Rotman Summer Institute on Philosophy of Cosmology, Goderich, Ontario
• "Adios, Lorentz! Hola, Kuhn!" -Invited Lecture, Rotman Summer Institute on Philosophy of Cosmology, Goderich, Ontario
• "Quantum Black Holes in the Sky: from Quantum Gravity to Astrophysics and Cosmology" -Invited Contribution, Solvay-Perimeter-APC Workshop on "Cosmological Frontiers in Funda- mental Physics", Solvay Institute, Brussels
• "Quantum Black Holes in the Sky: from Quantum Gravity to Astrophysics and Cosmology" -Invited HEP Seminar, McGill University
• "Quantum Black Holes in the Sky" -Plenary Lecture, CosPA 2017, Kyoto University
• "Quantum Black Holes in the Sky" -Invited Colloquium, University of Kansas
• "Seeing Dark in the Extremes: from nanostructure, to infinity and beyond" -Invited CPARC colloquium, Queen's University
• "Echoes from the Abyss" - Invited panelist, Physics and Astrophysics at the eXtreme (PAX Amsterdam)
• "How to turn Quantum Gravity into Science?" -Invited speaker, Testing the Fabric of Spacetime, SISSA, Italy
• "Reflections on Spacetime" -Invited Speaker, Cosmology and the Future of Spacetime, Western University, Ontario
• "Echoes from the Abyss" - Invited seminar, Department of Applied Mathematics, University of Waterloo
• "Echoes from the Abyss" - Invited contribution, Testing Gravity 2017, Simon Fraser University
• "The many faces of the cosmological constant problem" -Invited Contribution, Experimental Search for Quantum Gravity, Frankfurt Institute for Ad- vanced Studies, Germany
• "E.F.T. is Evil!" -Invited Contribution, Unifying Tests of General Relativity, Burke Institute, Caltech
• "Cosmological non-Constant Problem: Astrophysical limits of Particle Physics" -Invited HET-Discovery Seminar, Niels Bohr Institute, University of Copenhagen, Denmark
• "Accretion in Radiative Equipartition" -Invited Seminar, Dark Cosmology Centre, University of Copenhagen, Denmark
• "Quantum Black Holes in the Sky" -Invited Colloquium, Department of Physics, Ohio State University
• "Pulsar Timing Constraints on Physics Beyond Standard Model" -Invited Contribution, Mann Fest, University of Waterloo, Canada
• "Alice in the (Relativistic) Wonderland" -Invited Colloquium, Department of Mathematics, Western University, Canada
• "Cosmological Non-Constant Problem: The case for TeV scale Quantum Gravity" Division of Particles and Fields, American Physical Society meeting, U-Michigan, Ann Arbor
• "Cosmological Non-Constant Problem: The case for TeV scale Quantum Gravity" High Energy Physics Seminar, University of Toronto
• "(Real) Cosmology with Quark-Gluon Plasmas" Joint Cosmology/HEP seminar, Brookhaven National Laboratory
• "Cosmological Non-Constant Problem: The case for TeV scale Quantum Gravity" Invited contribution, First Erlangen workshop on Quantum Gravity and Cosmology, Erlangen University, Germany
• "Cosmological (Non-) Constant Problem" Invited contribution, Testing Gravity 2015, Simon Fraser University
• "An Introduction to the Universe" Invited Plenary Talk, Sharif University Alumni Conference Sharif University of Technology, Tehran
• "From Black Holes to Big Bang, and Back!" Invited Colloquium, School of Astronomy Institute for Physics and Mathematics (IPM), Tehran
• "Dark Matter Nanostructure" Invited Cosmology Seminar, Department of Physics Sharif University of Technology, Tehran
• "From Black Holes to Big Bang, and Back!" Invited Colloquium, Department of Physics Isfahan University of Technology
• "Life after Lorentz: Quantum Mechanics, Gravity, and the Crisis of Falsifiability" Invited Colloquium, Department of Physics University of Tehran
• "Cosmological (Non)-Constant Problem" Invited Contribution, Large Angle Anomalies: from a posteriori to a priori, Case-Western Reserve University
• "Dark Matter Nanostructure" Invited Astrophysics Seminar, Department of Physics and Astronomy, University of Waterloo
• "From Black Holes to Big Bang, and Back!" Invited Cosmology Seminar, Perimeter Institute
• "Probing Dark Matter Nanostructure", Mitchell Workshop on Collider and Dark Matter Physics, United States, Texas, College Station
• "Missing Baryons: How Much? How Hot? How Fast?", Cross-Correlating Cosmic Fields Conference, China, Shanghai
• "Tales of Dark Matter on Small Scales", Colloquium - Kavli Institute for Astronomy and Astrophysics, China, Beijing
• "Out of the White Hole: A Holographic Origin for the Big Bang" Invited Contribution, Cosmology After Planck, University of Michigan-Ann Arbor
• "Dynamical Emergence of Universal Horizons during the formation of Black Holes" Invited Contribution, LOOPS 13, Perimeter Institute
• "Where wil Einstein Fail?" Invited Contribution, Canadian Astronomical Society (CASCA) Annual Meeting, University of British Columbia
• "Life after Lorentz: Quantum Mechanics, Gravity, and the Crisis of Falsifiability" Invited Colloquium, University of Wisconsin-Madison
• "Tales of Dark Matter on small scales" Invited Contribution, TAMU Workshop on Dark Matter, Texas A&M University
• "Why is particle physics Lorentz-Invariant?" -Invited Contribution, Kavli IPMU focus week on Gravity and Lorentz violation
• "Why is particle physics Lorentz-Invariant?" Invited Contribution, Experimental Search for Quantum Gravity: The Hard Facts, Perimeter Institute
• "Hot Big Bang at a Lifshitz point" Invited Contribution, Canadian Association of Physicists Congress , Calgary, AB
• "Tales of Dark Matter on small scales" Invited Contribution, Theoretical Physics Workshop, Western University, London, ON
• "Reviving Gravity"s Aether in Einstein"s Universe" -Invited Colloquium, York University, Toronto, ON (Feb. 2012)
• "Horava-Lifshitz Cosmology and Dark Matter Haloes" -Invited Lectures, Cape Town Cosmology School (Jan. 2011)
• "Where will Einstein fail? Insights into Gravity and Dark Energy" -Vainu Bappu Memorial Gold Medal award ceremony, IUCAA, Pune, India (Oct. 2011) -KICP Colloquium, University of Chicago (Oct. 2011) -Invited Seminar, Canadian Institute for Theoretical Physics (CITA), University of Toronto (Sep. 2011)
• "Aether, Quantum Gravity and Cosmology" Invited Contribution, Cosmological Frontiers in Fundamental Physics, APC, Paris
• "Aether, Quantum Gravity, and Cosmology" Invited Contribution, Philosophy of Cosmology, University of Western Ontario
• "Fine Structure of Dark Matter Phase Space" Invited Contribution, Dark Matter: Its Origin, Models, and Detection, University of New Mexico
• "How can astrophysical compact objects shed light on dark cosmology?" Invited High Energy Theory Seminar, University of Amsterdam
• "Largest and Smallest Dark Matter Clusters, and what we can learn from them" Invited High Energy Theory Seminar, University of Michigan, Ann Arbor
• "Cosmology and the End of Physics!" Invited Colloquium, Physics Department, Guelph University
• "Non-linear Structure Formation in Cosmology" Invited Lectures, Institute for Research in Fundamental Sciences (IPM), Tehran
• "First Precision Measurement in Quantum Gravity" High Energy Physics Seminar, Institute for Research in Fundamental Sciences (IPM), Tehran (Aug. 2010)
• "Hierarchy in the Phase Space and Dark Matter Astronomy" Astrophysics seminar, Queen's University, Kingston, ON
• "Stellar Black Holes and the Thermodynamic Origin of Cosmic Acceleration" Invited Colloquium, Institut dAstrophysique de Paris
• "Cuscuton and solving the cosmological constant problem" High Energy Physics seminar, Physics department, Vanderbilt University
• "Stellar Black Holes and the origin of cosmic acceleration" Cosmology seminar, KIPAC, Stanford University, (Sep. 2009)
• "Hierarchy in the Phase Space and Dark Matter Astronomy" -CYGNUS 2009 workshop on directional dark matter detection, MIT, Cambridge, MA
• "Stellar Black Holes and the origin of cosmic acceleration" Theory Canada 5, Fredericton, NB
• "The End of the Cosmological Constant Problem" -Understanding the Dark Sector: Dark Matter and Dark Energy, Aspen Winter workshop, Aspen, CO
• "Primordial non-Gaussianity in Cosmology" Cosmology Seminar, Physics department, Sharif University of Technology, Tehran, Iran
• "Missing thermal energy of the Universe" Invited Contribution, Open questions from clusters of galaxies, OMP, Toulouse, France
• "Physics beyond the Horizon" Physics Colloquium, University of Pennsylvania
• "Fundamental Physics with the Integrated Sachs-Wolfe effect" Aspen CMB Conference, Aspen, CO
• "Fundamental Plane of Sunyaev-Zel'dovich clusters" Astrophysics of near-term Cosmological Observations, CITA, University of Toronto
• "Our Tumultuous Journey into the Dark Side" Invited Physics Colloquium, York University
• PIRSA:18060014, Cosmological non-Constant Problem, 2018-06-05, Asymptotic Safety in a Dark Universe
• PIRSA:18020112, Quantum Black Holes in the Sky: from Quantum Gravity to Astrophysics and Cosmology, 2018-02-27, Cosmology & Gravitation
• PIRSA:15110107, Quantum Gravity, à la Aether, 2015-11-26, PI Day - November, 2015
• PIRSA:15080013, Welcome and Opening Remarks, 2015-08-10, Cosmic Flows (and other novelties on Large Scales)
• PIRSA:14110060, PHYS 781 - Lecture 25, 2014-11-28, Fundamentals of Astrophysics
• PIRSA:14110056, PHYS 781 - Lecture 24, 2014-11-27, Fundamentals of Astrophysics
• PIRSA:14110192, PHYS 781 - Lecture 7, 2014-11-25, PHYS 781 - Fundamentals of Astrophysics
• PIRSA:14110052, PHYS 781 - Lecture 23, 2014-11-25, Fundamentals of Astrophysics
• PIRSA:14110059, PHYS 781 - Lecture 22, 2014-11-21, Fundamentals of Astrophysics
• PIRSA:14110055, PHYS 781 - Lecture 21, 2014-11-20, Fundamentals of Astrophysics
• PIRSA:14110051, PHYS 781 - Lecture 20 , 2014-11-18, Fundamentals of Astrophysics
• PIRSA:14110142, PHYS 781 - Lecture 19, 2014-11-14, Fundamentals of Astrophysics
• PIRSA:14110054, PHYS 781 - Lecture 18, 2014-11-13, Fundamentals of Astrophysics
• PIRSA:14110050, PHYS 781 - Lecture 17, 2014-11-11, Fundamentals of Astrophysics
• PIRSA:14110057, PHYS 781 - Lecture 16, 2014-11-07, Fundamentals of Astrophysics
• PIRSA:14110053, PHYS 781 - Lecture 15, 2014-11-06, Fundamentals of Astrophysics
• PIRSA:14110049, PHYS 781 - Lecture 14, 2014-11-04, Fundamentals of Astrophysics
• PIRSA:14100065, PHYS 781 - Lecture 13, 2014-10-31, PHYS 781
• PIRSA:14100060, PHYS 781 - Lecture 12, 2014-10-30, PHYS 781
• PIRSA:14100055, PHYS 781 - Lecture 11, 2014-10-28, PHYS 781
• PIRSA:14100064, PHYS 781 - Lecture 10, 2014-10-24, PHYS 781
• PIRSA:14100059, PHYS 781 - Lecture 9, 2014-10-23, PHYS 781
• PIRSA:14100123, PHY 789 - Lecture 2, 2014-10-22, PHYS 781
• PIRSA:14100122, PHY 789 - Lecture 1, 2014-10-21, PHYS 781
• PIRSA:14100054, PHYS 781 - Lecture 8, 2014-10-21, PHYS 781
• PIRSA:14100052, PHYS 781 - Lecture 7, 2014-10-07, PHYS 781
• PIRSA:14100061, PHYS 781 - Lecture 6, 2014-10-03, PHYS 781
• PIRSA:14100056, PHYS 781 - Lecture 5, 2014-10-02, PHYS 781
• PIRSA:14090088, From Black Holes to Big Bang, and Back, 2014-09-30, Cosmology & Gravitation
• PIRSA:14090085, PHYS 781 - Lecture 4, 2014-09-30, PHYS 781
• PIRSA:14090087, PHYS 781 - Lecture 3, 2014-09-26, PHYS 781
• PIRSA:14090086, PHYS 781 - Lecture 2, 2014-09-25, PHYS 781
• PIRSA:14090084, PHYS 781 - Lecture 1, 2014-09-23, PHYS 781
• PIRSA:13090064, A Non-Local Reality: Is there a Phase Uncertainty in Quantum Mechanics?, 2013-09-03, Quantum Foundations
• PIRSA:13070044, Shape Dynamics - 2, 2013-07-22, Loops 13
• PIRSA:12100108, Lorentz symmetry: Broken, intact or deformed?, 2012-10-24, Experimental Search for Quantum Gravity 2012
• PIRSA:12100085, Photons and Quantum Gravity in Astrophysics, 2012-10-22, Experimental Search for Quantum Gravity 2012
• PIRSA:12070003, Modern Cosmology, 2012-07-09, Cosmology & Gravitation
• PIRSA:12050066, Trials and Tribulations of Aether, 2012-05-09, Conformal Nature of the Universe
• PIRSA:11090081, Structure in the Phase Space and Dark Matter Astronomy, 2011-09-23, Unravelling Dark Matter Conference
• PIRSA:10050059, Cosmological constant problem: rethinking quantum and gravity, 2010-05-22, Laws of Nature: Their Nature and Knowability
• PIRSA:09120053, Cosmology - Review (PHYS 621) - Lecture 5, 2009-12-04, Perimeter Scholars International
• PIRSA:09120052, Cosmology - Review (PHYS 621) - Lecture 4, 2009-12-03, Perimeter Scholars International
• PIRSA:09120051, Cosmology - Review (PHYS 621) - Lecture 3, 2009-12-02, Perimeter Scholars International
• PIRSA:09120050, Cosmology - Review (PHYS 621) - Lecture 2, 2009-12-01, Perimeter Scholars International
• PIRSA:09110144, Cosmology - Review (PHYS 621) - Lecture 1, 2009-11-30, Perimeter Scholars International
• PIRSA:09110058, Cuscuton and Horava-Lifshitz gravity, 2009-11-09, Gravity at a Lifshitz Point
• PIRSA:09070014, Black hole horizons and the origin of cosmic acceleration, 2009-07-07, Holographic Cosmology Workshop
• PIRSA:09050088, Gravitational aether as a solution to the CC problem and more!, 2009-05-27, New Prospects for Solving the Cosmological Constant Problem
• PIRSA:09030036, (Towards) the end of the cosmological constant problem!, 2009-03-19, Cosmology
• PIRSA:08100062, Observational Evidence for Massive Gravity, 2008-10-23, PI CITA Joint Cosmology Day
• PIRSA:C08018, Sep.-Dec., 2008, Astrophysics & Cosmology Through Problems, Graduate Course Lecture Series (with Mark Wyman)
• PIRSA:08060144, Gravitational Aether as a solution to the cosmological constant problem, 2008-06-03, PASCOS 08
• PIRSA:08030069, Primordial non-Gaussianity, statistics of collapsed objects, and the ISW effect, 2008-03-10, Origins and Observations of Primodial Non-Gaussianity
• PIRSA:08020040, Physics beyond the Horizon, 2008-02-20, Colloquium
• PIRSA:08010043, Physics Beyond the Horizon, 2008-01-25, Cosmology
• PIRSA:06110048, Missing Thermal Energy of the Universe, 2006-11-10, Cosmology on the Great Lakes Workshop