Ultra-High-Frequency GWs: A Theory and Technology Roadmap

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Nancy Aggarwal, Valerie Domcke (CERN), Francesco Muia (University of Cambridge), Fernando Quevedo (University of Cambridge), Andreas Ringwald (Deutsches Elektronen-Synchrotron DESY), Jessica Steinlechner, Sebastian Steinlechner
This workshop is part of the Ultra-High-Frequency Gravitational Waves initiative (see the website of our initiative) and comes after a first meeting held at ICTP in Trieste in 2019 (see the website of the first workshop) that led to a review paper on the subject.
The aim of this meeting is to foster the technology development that is necessary to get to ultra-high-frequency gravitational wave detection. In particular, we will discuss
  • the science case for UHF-GW searches
  • new detector concepts
  • feasibility studies and construction of prototypes for proposed detector concepts
  • coordinating an international effort to support collaborations working on UHF-GW detectors

The workshop will combine theoretical developments regarding GW sources in different parts of the ultra-high-frequency band with experimental concepts aiming at probing them.

Each day we will have a discussion session with the aim of setting up working groups around one or more detector concepts and/or theoretical aspects of sources, which will be encouraged to continue their work after the end of the workshop, hopefully contributing to the technology development that is needed to make concrete progress in the field.

If you would like to contribute a talk, please contact the organizers.

We warmly invite all participants to join our mattermost discussion channel. To join for the first time, please use this invitation link. For instructions and help debugging, see here.


Ultra-High-Frequency Gravitational Waves
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  • Adam Mann
  • Alberto Roper Pol
  • Aldo Ejlli
  • Alexander Bonilla Rivera
  • Ameek Malhotra
  • Andre Fuzfa
  • Andreas Ringwald
  • Andrew Geraci
  • Andrew Miller
  • Angelo Ricciardone
  • Anton Sokolov
  • Antonio Pontin
  • Antonio Riotto
  • Asuka Ito
  • Axel Brandenburg
  • Axel Lindner
  • Brijesh Kanodia
  • Bruno Valeixo Bento
  • Camilo Alfredo Garcia Cely
  • Caner Unal
  • Carlo Contaldi
  • Carlos F. Sopuerta
  • Carlos Frajuca
  • Carlos Tamarit
  • Chiara Caprini
  • Christoph Reinhardt
  • Christophe Grojean
  • Christophe Le Poncin-Lafitte
  • Christopher Hughes
  • Daniel G. Figueroa
  • Daniele Bertacca
  • David Dunsky
  • David Mathes
  • David Shoemaker
  • David Wands
  • Debika Chowdhury
  • Deyan Mihaylov
  • Dibya Chakraborty
  • Diego Blas
  • Dimitrios Pesios
  • Ema Dimastrogiovanni
  • Evangelos Sfakianakis
  • Fabio van Dissel
  • Francesco Muia
  • Francesco Ronga
  • Francesco Sorge
  • Francisco Torrenti
  • Friederike Januschek
  • Fulvio Ricci
  • Gabriele Franciolini
  • Gary Stephenson
  • george winstone
  • Georgios Lukes-Gerakopoulos
  • Geraldine Servant
  • Germano Nardini
  • Giancarlo Cella
  • Gianmassimo Tasinato
  • Gianpaolo Carosi
  • Giovanni Mazzitelli
  • Giuseppe Messineo
  • Gongjun Choi
  • Graham White
  • Gregg Harry
  • Gregorio Carullo
  • Gudrid Moortgat-Pick
  • Guillermo Ballesteros
  • Hardi Veermäe
  • Hartmut Grote
  • Hitoshi Murayama
  • Huan Yang
  • Ik Siong Heng
  • Ippocratis Saltas
  • Isabella Masina
  • Ivette Fuentes
  • Ivonne Zavala
  • Jacob Leedom
  • Jacopo Fumagalli
  • Jan Schütte-Engel
  • Jarah Evslin
  • Jinsu Kim
  • Jiro Soda
  • Joachim Kopp
  • Johannes Noller
  • Johannes van den Brand
  • John March-Russell
  • John Quenby
  • Jonathon Coleman
  • Juan Garcia-Bellido
  • Kenneth Marschall
  • Kentaro Komori
  • Koji Nagano
  • Krisztian Peters
  • Laura Iacconi
  • Liliana Velasco-Sevilla
  • Lucas Pinol
  • Lukas Witkowski
  • Madhav Tiwari
  • Manal Yassine
  • Marco Antonio Merchand Medina
  • Marek Lewicki
  • Masha Baryakhtar
  • Matteo Fasiello
  • Matteo Luca Ruggiero
  • Matthew Robbins
  • Mauro Oi
  • Maxim Goryachev
  • Michael A. Fedderke
  • Michael Tobar
  • Michael-Henry Wentzel
  • Miguel Llamas Lanza
  • Mike Cruise
  • Mikko Laine
  • Mrunali Gaijan
  • Nader Inan
  • Nanditha T K
  • Nathaniel Craig
  • Nicolas Herman
  • Nikhil Mukund
  • Nikolaos Stergioulas
  • Nilanjandev Bhaumik
  • Odylio Aguiar
  • Ofek Birnholtz
  • Ogan Ozsoy
  • Oliver Gould
  • Oriol Pujolas Boix
  • Ornella Juliana Piccinni
  • Paolo Pani
  • Pedro Schwaller
  • Peera Simakachorn
  • Pengyuan Gao
  • Philip Soerensen
  • Piero Rapagnani
  • Pol Forn-Díaz
  • Preston Jones
  • Pyungwon Ko
  • R.C. Woods
  • Raffaele Tito D'Agnolo
  • Richard Brito
  • Rome Samanta
  • Ryusuke Jinno
  • Sanyukta Agarwal
  • Sarah Heim
  • Sarif Khan
  • Sebastian Ellis
  • Sebastien Clesse
  • Sichun Sun
  • Soubhik Kumar
  • Stefan Antusch
  • Subodh Patil
  • Sugumi Kanno
  • Susha Parameswaran
  • Sébastien Renaux-Petel
  • Takahiro S. Yamamoto
  • Tetiana Obikhod
  • Theophanes Karydas
  • Thomas Helfer
  • Vaishali Adya
  • Valerie Domcke
  • Ville Vaskonen
  • Weishuang Xu
  • William Campbell
  • Xavier Rojas
  • Xingang Chen
  • Xiu-Fei Li
  • Yanou Cui
  • Yifan Chen
  • Yue Zhao
  • Yun-Long Zhang
  • Yuta Michimura
  • Yutong He
  • zhuoyi li
  • Zoltan Ligeti
    • 2:00 PM 2:15 PM
      Convener: Prof. Mike Cruise (University of Birmingham)
    • 2:15 PM 3:15 PM
      Experimental Concepts: Below the MHz
      Convener: Francesco Muia
      • 2:15 PM
        Detecting high-frequency gravitational waves with optically levitated nanoparticles 30m
        Speaker: George Winstone (Northwestern University)
      • 2:45 PM
        Quantum Frequency Interferometry: with applications ranging from gravitational wave detection to dark matter searches 30m
        Speaker: Ivette Fuentes (University of Nottingham)
    • 3:15 PM 3:45 PM
      Discussion: pre-recorded contributed talks

      Tabletop detectors

      • 3:15 PM
        Gravitational Wave Gastronomy 25m

        The symmetry breaking of grand unified gauge groups in the early universe often leaves behind relic topological defects such as cosmic strings, domain walls, or monopoles. For some symmetry breaking chains, hybrid defects can form where cosmic strings attach to domain walls or monopoles attach to strings. In general, such hybrid defects are unstable and can leave behind unique gravitational wave fingerprints. In this talk, I will discuss the gravitational wave spectrum from 1) the destruction of a cosmic string network by the nucleation of monopoles which cut up and eat’ the strings, 2) the collapse and decay of a monopole-string network by strings that ‘eat’ the monopoles, 3) the destruction of a domain wall network by the nucleation of string-bounded holes on the wall that expand andeat’ the wall, and 4) the collapse and decay of a string-bounded wall network by walls that eat’ the strings, with a particular focus on the latter for this talk. We call the gravitational wave signals produced from theeating’ of one topological defect by another “gravitational wave gastronomy”. We find that the gravitational wave gastronomy signals considered yield unique spectra, typically at ultra high frequencies, that can be used to narrow down the SO(10) symmetry breaking chain to the Standard Model and the scales of symmetry breaking associated with the consumed topological defects.

        Speaker: David Dunsky (UC Berkeley)
      • 3:15 PM
        Gravitomagnetic resonance and gravitational waves 25m

        Gravitational waves are usually described in terms of a
        transverse and traceless (TT) tensor, which allows to introduce the so-called TT coordinates. However, another possible approach is based on the use of a Fermi coordinates system, defined in the vicinity of the world-line of an observer arbitrarily moving in spacetime. In particular, Fermi coordinates have a direct operational meaning, since they are the coordinates an observer would use to perform space and time measurements; indeed, using these coordinates the metric tensor contains (up to the required approximation level) only quantities that are invariant under coordinate transformations internal to the reference frame. Using this approach it is simple to emphasise that what an observer measures depends both on the background field where he is moving and, also, on his kind of motion. This is quite similar to what happens when we study classical mechanics in non inertial frames: inertial forces appear, depending on the peculiar motion of the frame with respect to an inertial one. We show that using Fermi coordinates the effects of a plane gravitational wave can be described by gravitoelectromagnetic fields: in other words, the wave field is equivalent to the action of a gravitoelectric and a gravitomagnetic field, that are transverse to the propagation direction and orthogonal to each other. In particular, the gravito-magnetic field acts on spinning particles and we show that, due to the action of the gravitational wave field a gravitomagnetic resonance may appear. We give both a classical and a quantum description of this phenomenon and suggest that it can be used as the basis for a new type of
        gravitational wave detectors.

        Speaker: Matteo Luca Ruggiero (Politecnico di Torino)
      • 3:15 PM
        GW experiments for dark matter direct detection 25m
        Speaker: Yue Zhao (University of Utah)
      • 3:15 PM
        Resonant Electromagnetic Gravitational Wave Detectors 25m
        Speaker: Nicolas Herman (University of Namur)
      • 3:15 PM
        Ultra-high frequency gravitational waves from alpha-attractor models of inflation 25m

        We consider primordial gravitational waves induced by large density perturbations generated by inflation in the very early universe. Cosmological alpha-attractors stand out as particularly compelling models to describe inflation, naturally meeting tight observational bounds from cosmic microwave background (CMB) experiments. We investigate alpha-attractor potentials in presence of an inflection point. The curvature perturbation is enhanced at high frequencies, which can lead to primordial black holes production and second-order gravitational waves. Consistency with the current CMB measurements implies that PBHs can only be produced with masses smaller than 10^8 g and are accompanied by ultra-high frequency gravitational waves, with a peak expected to be at frequencies of order 1MHz or above.

        Speaker: Laura Iacconi (Institute of Cosmology and Gravitation (University of Portsmouth))
      • 3:15 PM
        Ultra-High-Frequency Gravitational Waves from Oscillons 25m
        Speaker: Evangelos Sfakianakis (IFAE)
      • 3:40 PM
    • 3:45 PM 4:00 PM
      coffee break 15m
    • 4:00 PM 5:00 PM
      Theory: Below the MHz
      Convener: Dr Ornella Juliana Piccinni
    • 5:00 PM 5:15 PM
      coffee break 15m
    • 5:15 PM 6:15 PM
      Discussion: Tabletop scale experiments

      Tabletop detectors

      Convener: Nancy Aggarwal (Northwestern University)
    • 10:00 AM 10:30 AM
      Discussion: on talks of previous day

      Tabletop detectors

    • 10:30 AM 12:00 PM
      Mixed Session: Between MHz and GHz
      Convener: Camilo Garcia Cely (Deutsches Elektronen-Synchrotron DESY)
    • 12:00 PM 12:30 PM
      coffee break 30m
    • 12:30 PM 1:30 PM
      Experimental Concepts: Microwave cavities
      Convener: Francesco Sorge (INFN Napoli)
    • 1:30 PM 1:45 PM
      coffee break 15m
    • 1:45 PM 2:45 PM
      Discussion: UHF GW initiative / living review

      Tabletop detectors

      Convener: Mike Cruise (University of Birmingham)