This article is an #Update of the Living Review from 2021:
Aggarwal, N., Aguiar, O.D., Blas, D. et al. Challenges and opportunities of gravitational-wave searches above 10 kHz. #LivingRevRelativ 28, 10 (2025). doi.org/10.1007/s411... #OpenAccess
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This is a self-contained summary of the current status rather than a traditional update of the previous 2004 Living Reviews article on the subject:
Abhay Ashtekar & Badri Krishnan. Quasi-local black hole horizons: recent advances. #LivingRevRelativ 28, 8 (2025). doi.org/10.1007/s411... #OpenAccess
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Better late than never... 😩 New in Living Reviews in Relativity:
LISA Consortium Waveform Working Group. Waveform modelling for the Laser Interferometer Space Antenna. #LivingRevRelativ 28, 9 (2025). doi.org/10.1007/s411...
#OpenAccess #WhitePaper @lisacommunity.bsky.social
Screenshot: Topical collection “Machine Learning in Gravitational-Wave Science”
#CallforPapers
The journals #GenRelativGravit and #LivingRevRelativ have opened a collection “Machine Learning in Gravitational-Wave Science”, which aims to include review articles and original research: link.springer.com/collections/... #MachineLearning
Everything you always wanted to know about fundamental physical constants — New article #update in Living Reviews:
Jean-Philippe Uzan. Fundamental constants: from measurement to the universe, a window on gravitation and cosmology. #LivingRevRelativ 28, 6 (2025). doi.org/10.1007/s411... #OpenAccess
Bala R. Iyer
Piotr T. Chruściel
#News: Piotr T. Chruściel has been appointed new Editor-in-Chief of Living Reviews in Relativity, taking over responsibilities from Bala R. Iyer who has led the journal for 9 years. — Thank you Bala, and welcome Piotr!
link.springer.com/journal/4111... #MeetTheEditors #LivingRevRelativ
"Critical Phenomena in Gravitational Collapse" — Major update submitted to #LivingRevRelativ. Feedback and suggestions very welcome: arxiv.org/abs/2507.07636
Josu C. Aurrekoetxea, Katy Clough, Eugene A. Lim. Cosmology using numerical relativity. #LivingRevRelativ 28, 5 (2025). doi.org/10.1007/s411... #OpenAccess #ReviewArticle
#WhitePaper Ayzenberg, D., Blackburn, L., Brito, R. et al. Fundamental physics opportunities with future ground-based mm/sub-mm VLBI arrays. #LivingRevRelativ 28, 4 (2025). doi.org/10.1007/s411... #OpenAccess #ngEHT #BlackHoles
Abstract This review is focused on tests of Einstein’s theory of general relativity with gravitational waves that are detectable by ground-based interferometers and pulsar-timing experiments. Einstein’s theory has been greatly constrained in the quasi-linear, quasi-stationary regime, where gravity is weak and velocities are small. Gravitational waves are allowing us to probe a complimentary, yet previously unexplored regime: the non-linear and dynamical extreme gravity regime. Such a regime is, for example, applicable to compact binaries coalescing, where characteristic velocities can reach fifty percent the speed of light and gravitational fields are large and dynamical. This review begins with the theoretical basis and the predicted gravitational-wave observables of modified gravity theories. The review continues with a brief description of the detectors, including both gravitational-wave interferometers and pulsar-timing arrays, leading to a discussion of the data analysis formalism that is applicable for such tests. The review then discusses gravitational-wave tests using compact binary systems, and ends with a description of the first gravitational wave observations by advanced LIGO, the stochastic gravitational wave background observations by pulsar timing arrays, and the tests that can be performed with them.
Major #Update of the 2013 Living Review:
Nicolás Yunes, Xavier Siemens, Kent Yagi. Gravitational-wave tests of general relativity with ground-based detectors and pulsar-timing arrays. #LivingRevRelativ 28, 3 (2025). doi.org/10.1007/s411... #OpenAccess
Example of where machine learning fits in the workflow for GW detectors and data analysis. The gear in the picture indicates the parts of the data analysis chain where ML could be used.
Elena Cuoco, Marco Cavaglià, Ik Siong Heng, David Keitel, Christopher Messenger. Applications of machine learning in gravitational-wave research with current interferometric detectors. #LivingRevRelativ 28, 2 (2025) doi.org/10.1007/s411... #OpenAccess #Review #MachineLearning #GravitationalWaves
Abstract: In the recent years, primordial black holes (PBHs) have emerged as one of the most interesting and hotly debated topics in cosmology. Among other possibilities, PBHs could explain both some of the signals from binary black hole mergers observed in gravitational-wave detectors and an important component of the dark matter in the Universe. Significant progress has been achieved both on the theory side and from the point of view of observations, including new models and more accurate calculations of PBH formation, evolution, clustering, merger rates, as well as new astrophysical and cosmological probes. In this work, we review, analyze and combine the latest developments in order to perform end-to-end calculations of the various gravitational-wave signatures of PBHs. Different ways to distinguish PBHs from stellar black holes are emphasized. Finally, we discuss their detectability with LISA, the first planned gravitational-wave observatory in space.
New #OpenAccess article in Living Reviews:
Bagui, Clesse, De Luca, et al. Primordial black holes and their gravitational-wave signatures. #LivingRevRelativ 28, 1 (2025). doi.org/10.1007/s411...
#BlackHoles #PBH #Cosmology #GravitationalWaves #LISA @lisacommunity.bsky.social
Bangalore Sathyaprakash
Living Reviews in Relativity welcomes B. S. Sathyaprakash! Expert from Penn State University and Cardiff University joins as new Associate Editor for Gravitational Waves:
link.springer.com/journal/4111... #LivingRevRelativ #MeetTheEditors
Abstract: We review some recent developments in mathematical aspects of relativistic fluids. The goal is to provide a quick entry point to some research topics of current interest that is accessible to graduate students and researchers from adjacent fields, as well as to researches working on broader aspects of relativistic fluid dynamics interested in its mathematical formalism. Instead of complete proofs, which can be found in the published literature, here we focus on the proofs’ main ideas and key concepts. After an introduction to the relativistic Euler equations, we cover the following topics: a new wave-transport formulation of the relativistic Euler equations tailored to applications; the problem of shock formation for relativistic Euler; rough (i.e., low-regularity) solutions to the relativistic Euler equations; the relativistic Euler equations with a physical vacuum boundary; relativistic fluids with viscosity. We finish with a discussion of open problems and future directions of research.
New in Living Reviews:
Marcelo M. Disconzi. Recent developments in mathematical aspects of relativistic fluids. #LivingRevRelativ 27, 6 (2024). doi.org/10.1007/s411... #OpenAcess
