Organizers:

D. Blas (ICREA - IFAE), J. Foster (Fermilab - U. Chicago), A. Jenkins (DAMTP), X. Xue (IFAE)

The discovery of gravitational waves (GWs) of frequencies around 100 Hz, and the recent strong evidence of a gravitational wave background at nHz have been two of the most important discoveries of recent years in Physics. Expanding these two frequency bands will bring new invaluable information about the cosmos and gravitation, and has triggered the community towards new concepts. Among them, new generation of CMB detectors to search for the lowest possible frequencies, LISA to cover the mHz band, or the use of cutting-edge sensing technologies to search for frequencies above kHz. Yet, these ideas are not able to cover all possible interesting physics cases, and the search for new ideas is very active.

Among them, it was recently demonstrated in different works that the precise monitorization of orbital motion achievable in binary pulsars, artificial satellites, the Moon orbit or space-craft orbits is at the level where it can be sensitive to GWs of frequencies that can not be covered with other future missions. This presents a unique opportunity to find GWs from different sources at a very low price (as the previous data sets may already exist or be motivated by other physics). Furthermore, these observations may also be affected by the presence of local dark matter for certain models. The previous expectations need to be confronted with the challenges of the analysis of real astrophysical data, which calls for a collaboration among experts from the theoretical implications and from the phenomenological and experimental realms. The purpose of this workshop is to gather a small group of experts filling this gap, with the aim of discussing which steps are needed to put these ideas on more solid grounds and to design optimal strategies to harvest all their potential. The key participants cover world leaders in pulsar timing, planetary missions, laser ranging and theoretical physics eager to work together in this direction.

Expected key participants

- Dr. Bruno Bertrand (Royal Observatory of Belgium) *
- Prof. Diego Blas (ICREA/FAE) (organizer)
- Dr. Jorge Martin Camalich (Instituto Astrofísico de Canarias)
- Prof. S. Dell'Agnello (LNF, INFN)
- Prof. Agnes Fienga (Observatoire de la Côte d’Azur, CNRS) *
- Dr. Joshua Foster (Fermilab/U Chicago) (organizer)
- Dr. Paulo Freire (Max-Planck-Institut für Radioastronomie)
- Dr. Aurelien Hees (Observatoire de Paris, CNRS)
- Dr. Justin Janquart (Royal Observatory of Belgium) *
- Dr. Alexander Jenkins (Kavli Institute for Cosmology and DAMTP) (organizer)
- Prof. Pol Nihan (Texas Tech U) *
- Dr. Luca Porcelli (LNF, INFN) *
- Dr. Soumen Roy (Royal Observatory of Belgium) *
- Prof. Prasenjit Saha (Zurich U)
- Prof. Stephen Taylor (Vanderbilt U) *
- Dr. Xiao Xue (IFAE, local) (organizer)
- Dr. Lorenz Zwick (Niels Bohr Institute)
* TBC

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