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Theoretical physicists working at a blackboard collaboration pod in the Beecroft building.
Credit: Jack Hobhouse

Edward Hardy

Associate Professor

Research theme

  • Fundamental particles and interactions

Sub department

  • Rudolf Peierls Centre for Theoretical Physics

Research groups

  • Particle theory
edward.hardy@physics.ox.ac.uk
Telephone: 01865 273631
Rudolf Peierls Centre for Theoretical Physics, room 60.08
  • About
  • Publications

A Next-Generation Liquid Xenon Observatory for Dark Matter and Neutrino Physics

(2022)

Authors:

J Aalbers, K Abe, V Aerne, F Agostini, S Ahmed Maouloud, DS Akerib, D Yu Akimov, J Akshat, AK Al Musalhi, F Alder, SK Alsum, L Althueser, CS Amarasinghe, FD Amaro, A Ames, TJ Anderson, B Andrieu, N Angelides, E Angelino, J Angevaare, VC Antochi, D Ant贸n Martin, B Antunovic, E Aprile, HM Ara煤jo, JE Armstrong, F Arneodo, M Arthurs, P Asadi, S Baek, X Bai, D Bajpai, A Baker, J Balajthy, S Balashov, M Balzer, A Bandyopadhyay, J Bang, E Barberio, JW Bargemann, L Baudis, D Bauer, D Baur, A Baxter, AL Baxter, M Bazyk, K Beattie, J Behrens, NF Bell, L Bellagamba, P Beltrame, M Benabderrahmane, EP Bernard, GF Bertone, P Bhattacharjee, A Bhatti, A Biekert, TP Biesiadzinski, AR Binau, R Biondi, Y Biondi, HJ Birch, F Bishara, A Bismark, C Blanco, GM Blockinger, E Bodnia, C Boehm, AI Bolozdynya, PD Bolton, S Bottaro, C Bourgeois, B Boxer, P Br谩s, A Breskin, PA Breur, CAJ Brew, J Brod, E Brookes, A Brown, E Brown, S Bruenner, G Bruno, R Budnik, TK Bui, S Burdin, S Buse, JK Busenitz, D Buttazzo, M Buuck, A Buzulutskov, R Cabrita, C Cai, D Cai, C Capelli, JMR Cardoso, MC Carmona-Benitez, M Cascella, R Catena, S Chakraborty, C Chan, S Chang, A Chauvin, A Chawla, H Chen, V Chepel, NI Chott, D Cichon, A Cimental Chavez, B Cimmino, M Clark, RT Co, AP Colijn, J Conrad, MV Converse, M Costa, A Cottle, G Cox, O Creaner, JJ Cuenca Garcia, JP Cussonneau, JE Cutter, CE Dahl, V D'Andrea, A David, MP Decowski, JB Dent, FF Deppisch, L de Viveiros, P Di Gangi, A Di Giovanni, S Di Pede, J Dierle, S Diglio, JEY Dobson, M Doerenkamp, D Douillet, G Drexlin, E Druszkiewicz, D Dunsky, K Eitel, A Elykov, T Emken, R Engel, SR Eriksen, M Fairbairn, A Fan, JJ Fan, SJ Farrell, S Fayer, NM Fearon, A Ferella, C Ferrari, A Fieguth, A Fieguth, S Fiorucci, H Fischer, H Flaecher, M Flierman, T Florek, R Foot, PJ Fox, R Franceschini, ED Fraser, CS Frenk, S Frohlich, T Fruth, W Fulgione, C Fuselli, P Gaemers, R Gaior, RJ Gaitskell, M Galloway, F Gao, I Garcia Garcia, J Genovesi, C Ghag, S Ghosh, E Gibson, W Gil, D Giovagnoli, F Girard, R Glade-Beucke, F Gl眉ck, S Gokhale, A de Gouv锚a, L Gr谩f, L Grandi, J Grigat, B Grinstein, MGD van der Grinten, R Gr枚ssle, H Guan, M Guida, R Gumbsheimer, CB Gwilliam, CR Hall, LJ Hall, R Hammann, K Han, V Hannen, S Hansmann-Menzemer, R Harata, SP Hardin, E Hardy, CA Hardy, K Harigaya, R Harnik, SJ Haselschwardt, M Hernandez, SA Hertel, A Higuera, C Hils, S Hochrein, L Hoetzsch, M Hoferichter, N Hood, D Hooper, M Horn, J Howlett, DQ Huang, Y Huang, D Hunt, M Iacovacci, G Iaquaniello, R Ide, CM Ignarra, G Iloglu, Y Itow, E Jacquet, O Jahangir, J Jakob, RS James, A Jansen, W Ji, X Ji, F Joerg, J Johnson, A Joy, AC Kaboth, AC Kamaha, K Kanezaki, K Kar, M Kara, N Kato, P Kavrigin, S Kazama, AW Keaveney, J Kellerer, D Khaitan, A Khazov, G Khundzakishvili, I Khurana, B Kilminster, M Kleifges, P Ko, M Kobayashi, M Kobayashi, D Kodroff, G Koltmann, A Kopec, A Kopmann, J Kopp, L Korley, VN Kornoukhov, EV Korolkova, H Kraus, LM Krauss, S Kravitz, L Kreczko, VA Kudryavtsev, F Kuger, J Kumar, B L贸pez Paredes, L LaCascio, Q Laine, H Landsman, RF Lang, EA Leason, J Lee, DS Leonard, KT Lesko, L Levinson, C Levy, I Li, SC Li, T Li, S Liang, CS Liebenthal, J Lin, Q Lin, S Lindemann, M Lindner, A Lindote, R Linehan, WH Lippincott, X Liu, K Liu, J Liu, J Loizeau, F Lombardi, J Long, MI Lopes, E Lopez Asamar, W Lorenzon, C Lu, S Luitz, Y Ma, PAN Machado, C Macolino, T Maeda, J Mahlstedt, PA Majewski, A Manalaysay, A Mancuso, L Manenti, A Manfredini, RL Mannino, N Marangou, J March-Russell, F Marignetti, T Marrod谩n Undagoitia, K Martens, R Martin, I Martinez-Soler, J Masbou, D Masson, E Masson, S Mastroianni, M Mastronardi, JA Matias-Lopes, ME McCarthy, N McFadden, E McGinness, DN McKinsey, J McLaughlin, K McMichael, P Meinhardt, J Men茅ndez, Y Meng, M Messina, R Midha, D Milisavljevic, EH Miller, B Milosevic, S Milutinovic, SA Mitra, K Miuchi, E Mizrachi, K Mizukoshi, A Molinario, A Monte, CMB Monteiro, ME Monzani, JS Moore, K Mor氓, JA Morad, JD Morales Mendoza, S Moriyama, E Morrison, E Morteau, Y Mosbacher, BJ Mount, J Mueller, A St J Murphy, M Murra, D Naim, S Nakamura, E Nash, N Navaieelavasani, A Naylor, C Nedlik, HN Nelson, F Neves, JL Newstead, K Ni, JA Nikoleyczik, V Niro, UG Oberlack, M Obradovic, K Odgers, CAJ O'Hare, P Oikonomou, I Olcina, K Oliver-Mallory, A Oranday, J Orpwood, I Ostrovskiy, K Ozaki, B Paetsch, S Pal, J Palacio, KJ Palladino, J Palmer, P Panci, M Pandurovic, A Parlati, N Parveen, SJ Patton, V P臎膷, Q Pellegrini, B Penning, G Pereira, R Peres, Y Perez-Gonzalez, E Perry, T Pershing, R Petrossian-Byrne, J Pienaar, A Piepke, G Pieramico, M Pierre, M Piotter, V Pizella, G Plante, T Pollmann, D Porzio, J Qi, Y Qie, J Qin, N Raj, M Rajado Silva, K Ramanathan, D Ram铆rez Garc铆a, J Ravanis, L Redard-Jacot, D Redigolo, S Reichard, J Reichenbacher, CA Rhyne, A Richards, Q Riffard, GRC Rischbieter, A Rocchetti, SL Rosenfeld, R Rosero, N Rupp, T Rushton, S Saha, L Sanchez, P Sanchez-Lucas, D Santone, JMF dos Santos, I Sarnoff, G Sartorelli, ABMR Sazzad, M Scheibelhut, RW Schnee, M Schrank, J Schreiner, P Schulte, D Schulte, H Schulze Eissing, M Schumann, T Schwemberger, A Schwenk, T Schwetz, L Scotto Lavina, PR Scovell, H Sekiya, M Selvi, E Semenov, F Semeria, P Shagin, S Shaw, S Shi, E Shockley, TA Shutt, R Si-Ahmed, JJ Silk, C Silva, MC Silva, H Simgen, F 艩imkovic, G Sinev, R Singh, W Skulski, J Smirnov, R Smith, M Solmaz, VN Solovov, P Sorensen, J Soria, TJ Sparmann, I Stancu, M Steidl, A Stevens, K Stifter, LE Strigari, D Subotic, B Suerfu, AM Suliga, TJ Sumner, P Szabo, M Szydagis, A Takeda, Y Takeuchi, P-L Tan, C Taricco, WC Taylor, DJ Temples, A Terliuk, PA Terman, D Thers, K Thieme, Th Th眉mmler, DR Tiedt, M Timalsina, WH To, F Toennies, Z Tong, F Toschi, DR Tovey, J Tranter, M Trask, GC Trinchero, M Tripathi, DR Tronstad, R Trotta, YD Tsai, CD Tunnell, WG Turner, R Ueno, P Urquijo, U Utku, A Vaitkus, K Valerius, E Vassilev, S Vecchi, V Velan, S Vetter, AC Vincent, L Vittorio, G Volta, B von Krosigk, M von Piechowski, D Vorkapic, CEM Wagner, AM Wang, B Wang, Y Wang, W Wang, JJ Wang, L-T Wang, M Wang, Y Wang, JR Watson, Y Wei, C Weinheimer, E Weisman, M Weiss, D Wenz, SM West, TJ Whitis, M Williams, MJ Wilson, D Winkler, C Wittweg, J Wolf, T Wolf, FLH Wolfs, S Woodford, D Woodward, CJ Wright, VHS Wu, P Wu, S W眉stling, M Wurm, Q Xia, X Xiang, Y Xing, J Xu, Z Xu, D Xu, M Yamashita, R Yamazaki, H Yan, L Yang, Y Yang, J Ye, M Yeh, I Young, HB Yu, TT Yu, L Yuan, G Zavattini, S Zerbo, Y Zhang, M Zhong, N Zhou, X Zhou, T Zhu, Y Zhu, Y Zhuang, JP Zopounidis, K Zuber, J Zupan

Axion quasiparticles for axion dark matter detection

Journal of Cosmology and Astroparticle Physics IOP Publishing 2021:08 (2021) 066

Authors:

Jan Sch眉tte-Engel, David JE Marsh, Alexander J Millar, Akihiko Sekine, Francesca Chadha-Day, Sebastian Hoof, Mazhar N Ali, Kin Chung Fong, Edward Hardy, Libor 艩mejkal

Abstract:

It has been suggested that certain antiferromagnetic topological insulators contain axion quasiparticles (AQs), and that such materials could be used to detect axion dark matter (DM). The AQ is a longitudinal antiferromagnetic spin fluctuation coupled to the electromagnetic Chern-Simons term, which, in the presence of an applied magnetic field, leads to mass mixing between the AQ and the electric field. The electromagnetic boundary conditions and transmission and reflection coefficients are computed. A model for including losses into this system is presented, and the resulting linewidth is computed. It is shown how transmission spectroscopy can be used to measure the resonant frequencies and damping coefficients of the material, and demonstrate conclusively the existence of the AQ. The dispersion relation and boundary conditions permit resonant conversion of axion DM into THz photons in a material volume that is independent of the resonant frequency, which is tuneable via an applied magnetic field. A parameter study for axion DM detection is performed, computing boost amplitudes and bandwidths using realistic material properties including loss. The proposal could allow for detection of axion DM in the mass range between 1 and 10 meV using current and near future technology.

Observing invisible axions with gravitational waves

Journal of Cosmology and Astroparticle Physics IOP Publishing 2021:06 (2021) 034

Authors:

Marco Gorghetto, Edward Hardy, Horia Nicolaescu

Abstract:

If the Peccei-Quinn symmetry associated to an axion has ever been restored after inflation, axion strings inevitably produce a contribution to the stochastic gravitational wave background. Combining effective field theory analysis with numerical simulations, we show that the resulting gravitational wave spectrum has logarithmic deviations from a scale invariant form with an amplitude that is significantly enhanced at low frequencies. As a result, a single ultralight axion-like particle with a decay constant larger than 1014 GeV and any mass between 10-18 eV and 10-28 eV leads to an observable gravitational wave spectrum and is compatible with constraints on the post-inflationary scenario from dark matter overproduction, isocurvature and dark radiation. Since the spectrum extends over a wide range of frequencies, the resulting signal could be detected by multiple experiments. We describe straightforward ways in which the Peccei-Quinn symmetry can be restored after inflation for such decay constants. We also comment on the recent possible NANOgrav signal in light of our results.

More axions from strings

SciPost Physics Stichting SciPost 10:2 (2021) 050

Authors:

Marco Gorghetto, Edward Hardy, Giovanni Villadoro

More axions from strings

SciPost Physics SciPost Foundation 10:2 (2021) 050

Authors:

Marco Gorghetto, Edward Hardy, Giovanni Villadoro

Abstract:

We study the contribution to the QCD axion dark matter abundance that is produced by string defects during the so-called scaling regime. Clear evidence of scaling violations is found, the most conservative extrapolation of which strongly suggests a large number of axions from strings. In this regime, nonlinearities at around the QCD scale are shown to play an important role in determining the final abundance. The overall result is a lower bound on the QCD axion mass in the post-inflationary scenario that is substantially stronger than the naive one from misalignment.

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