John March-Russell: Publications

QSHS: an axion dark matter resonant search apparatus

New Journal of Physics IOP Publishing 27:10 (2025) 105002

Authors:

A Alsulami, I Bailey, G Carosi, G Chapman, B Chakraborty, EJ Daw, N Du, S Durham, J Esmenda, J Gallop, T Gamble, T Godfrey, G Gregori, J Halliday, L Hao, E Hardy, EA Laird, P Leek, J March-Russell, PJ Meeson, CF Mostyn, Yu A Pashkin, SÓ Peatain, M Perry, M Piscitelli, M Reig, S Sarkar, A Sokolov, B-K Tan, S Withington

Abstract:

We describe a resonant cavity search apparatus for axion dark matter constructed by the quantum sensors for the hidden sector collaboration. The apparatus is configured to search for QCD axion dark matter, though also has the capability to detect axion-like particles, dark photons, and some other forms of wave-like dark matter. Initially, a tuneable cylindrical oxygen-free copper cavity is read out using a low noise microwave amplifier feeding a heterodyne receiver. The cavity is housed in a dilution refrigerator (DF) and threaded by a solenoidal magnetic field, nominally 8 T. The apparatus also houses a magnetic field shield for housing superconducting electronics, and several other fixed-frequency resonators for use in testing and commissioning various prototype quantum electronic devices sensitive at a range of axion masses in the range 2.0– 40μeVc−2. The apparatus as currently configured is intended as a test stand for electronics over the relatively wide frequency band attainable with the TM010 cavity mode used for axion searches. We present performance data for the resonator, DF, and magnet, and plans for the first science run.

Development of superfluid helium-3 bolometry using nanowire resonators with SQUID readout for the QUEST-DMC experiment

(2025)

Authors:

DMC Collaboration, E Leason, LV Levitin, S Autti, E Bloomfield, A Casey, N Darvishi, N Eng, P Franchini, RP Haley, PJ Heikkinen, A Jennings, A Kemp, J March-Russell, A Mayer, J Monroe, D MÃ¼nstermann, MT Noble, JR Prance, X Rojas, T Salmon, J Saunders, J Smirnov, R Smith, MD Thompson, A Thomson, A Ting, V Tsepelin, SM West, L Whitehead, DE Zmeev

A Prediction for Maximum Supercooling in SU(N) Confinement Transition

(2025)

Authors:

Prateek Agrawal, Gaurang Ramakant Kane, Vazha Loladze, John March-Russell

AION-10: Technical Design Report for a 10m Atom Interferometer in Oxford

(2025)

Authors:

K Bongs, A Brzakalik, U Chauhan, S Dey, O Ennis, S Hedges, T Hird, M Holynski, S Lellouch, M Langlois, B Stray, B Bostwick, J Chen, Z Eyler, V Gibson, TL Harte, CC Hsu, M Karzazi, C Lu, B Millward, J Mitchell, N Mouelle, B Panchumarthi, J Scheper, U Schneider, X Su, Y Tang, K TkalÄec, M Zeuner, S Zhang, Y Zhi, K Clarke, A Vick, CFA Baynham, O BuchmÃ¼ller, D Evans, L Hawkins, R Hobson, L Iannizzotto-Venezze, A Josset, D Lee, E Pasatembou, BE Sauer, MR Tarbutt, T Walker, L Badurina, A Beniwal, D Blas, J Carlton, J Ellis, C McCabe, G Parish, D Pathak Govardhan, V Vaskonen, T Bowcock, K Bridges, A Carroll, J Coleman, G Elertas, S Hindley, C Metelko, H Throssell, JN Tinsley, E Bentine, M Booth, D Bortoletto, C Foot, N Callaghan, C Gomez-Monedero, K Hughes, A James, T Leese, A Lowe, J March-Russell, J Sander, J Schelfhout, I Shipsey, D Weatherill, D Wood, SN Balashov, MG Bason, K Hussain, H Labiad, P Majewski, AL Marchant, D Newbold, Z Pan, Z Tam, TC Thornton, T Valenzuela, MGD van der Grinten, I Wilmut

De Sitter space constraints on brane tensions and couplings

Journal of High Energy Physics Springer 2025:7 (2025) 221

Authors:

Saquib Hassan, Georges Obied, John March-Russell

Abstract:

We argue for the existence of bounds on the tensions of p-branes in de Sitter space in terms of the Hubble rate and the strength of a class of Chern-Simons-like couplings. The world-volume couplings involve Abelian 1-form gauge fields in the bulk and possibly field strengths intrinsic to the brane. In many cases these couplings are the D-brane Chern-Simons terms present in string theory, while in other cases they are the interactions of axion domain walls with U(1) fields. Our arguments use the same logic and assumptions as the recent Festina Lente proposal (thus utilizing the properties of Nariai de Sitter black holes) and generalize it to extended objects, thereby providing a bottom-up set of constraints independent of any particular UV completion. We compare these bounds to the properties of (wrapped) D-branes in Type II string theory in the weak coupling limit, under the assumption that these properties are not modified significantly in de Sitter constructions. We find that all constraints are satisfied by D-branes, providing further evidence for the Festina Lente conjecture. For the particular case of 2-branes with Chern-Simons interactions we obtain a bound, which however can be evaded if the theory contains a light axion. Similarly, we find the bounds do not apply to axion domain walls due to the presence of the axion.

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