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We present constraints on the nature of axions and axionlike particles (ALPs) by analyzing gamma--ray data from neutron stars using the Fermi Large Area Telescope. In addition to axions solving the strong CP problem of particle physics,…

High Energy Astrophysical Phenomena · Physics 2016-03-02 Bijan Berenji , Jennifer Gaskins , Manuel Meyer

We review the physics potential of a next generation search for solar axions: the International Axion Observatory (IAXO). Endowed with a sensitivity to discover axion-like particles (ALPs) with a coupling to photons as small as…

We establish strong gravitational lens systems as robust probes of axion-like particles (ALPs) -- a candidate for dark matter. A tiny interaction of photons with ALPs induces birefringence. Multiple images of gravitationally lensed…

Cosmology and Nongalactic Astrophysics · Physics 2021-05-19 Aritra Basu , Jishnu Goswami , Dominik J. Schwarz , Yuko Urakawa

The dark matter and existence of new particles are now a possible explanation of several physics phenomena which evade the predictions of the Standard Model. In this context Axion-Like-Particles (ALP) with masses in the MeV to GeV range…

High Energy Physics - Experiment · Physics 2026-01-23 M. Zielinski , K. Proscinski , P. Salabura

Many existing and proposed experiments targeting QCD axion dark matter (DM) can also search for a broad class of axion-like particles (ALPs). We analyze the experimental sensitivities to electromagnetically-coupled ALP DM in different…

High Energy Physics - Phenomenology · Physics 2019-08-07 Nikita Blinov , Matthew J. Dolan , Patrick Draper , Jonathan Kozaczuk

Axions are well motivated particles proposed in an extension of the SM as a solution to the strong CP problem. Also, there is the category of Axion-Like Particles (ALPs) which appear in extensions of the SM and share the same phenomenology…

Solar and Stellar Astrophysics · Physics 2015-06-09 Juan Antonio García

Conventional approaches to probing axions and axion-like particles (ALPs) typically rely on a coupling to photons. However, if this coupling is extremely weak, ALPs become invisible and are effectively decoupled from the Standard Model.…

High Energy Physics - Phenomenology · Physics 2019-01-30 Camila S. Machado , Wolfram Ratzinger , Pedro Schwaller , Ben A. Stefanek

We have recently shown that axions and axion-like particles (ALPs) may emit an observable stochastic gravitational wave (GW) background when they begin to oscillate in the early universe. In this note, we identify the regions of ALP…

High Energy Physics - Phenomenology · Physics 2020-12-23 Camila S. Machado , Wolfram Ratzinger , Pedro Schwaller , Ben A. Stefanek

X-ray telescopes are an exceptional tool for searching for new fundamental physics. In particular, X-ray observations have already placed world-leading bounds on the interaction between photons and axion-like particles (ALPs). ALPs are…

High Energy Physics - Phenomenology · Physics 2018-04-11 Francesca Day , Sven Krippendorf

Axion is a promising candidate for ultralight dark matter which may cause a polarization rotation of laser light. Recently, a new idea of probing the axion dark matter by optical linear cavities used in the arms of gravitational wave…

High Energy Physics - Phenomenology · Physics 2021-09-29 Koji Nagano , Hiromasa Nakatsuka , Soichiro Morisaki , Tomohiro Fujita , Yuta Michimura , Ippei Obata

We summarise the recent progress of the Axion Longitudinal Plasma HAloscope (ALPHA) Consortium, a new experimental collaboration to build a plasma haloscope to search for axions and dark photons. The plasma haloscope is a novel method for…

Axions and axion-like particles (ALPs) appear in many extensions of the Standard Model and are being investigated as promising dark matter (DM) candidates. One viable methodology for their detection involves the investigation of the…

High Energy Astrophysical Phenomena · Physics 2024-04-18 Wen-Qing Guo , Zi-Qing Xia , Xiaoyuan Huang

Axions and other very light axion-like particles appear in many extensions of the Standard Model, and are leading candidates to compose part or all of the missing matter of the Universe. They also appear in models of inflation, dark…

High Energy Physics - Phenomenology · Physics 2018-08-01 Igor G. Irastorza , Javier Redondo

Various theories of dark matter predict distinctive astrophysical signatures in gravitational-wave sources that could be observed by ground- and space-based laser interferometers. Different candidates-including axions, dark photons,…

High Energy Astrophysical Phenomena · Physics 2026-01-01 Andrew L. Miller

Hypothetical axion-like particles (ALPs) are of interest because of their potential to act as dark matter or to reveal information about yet undiscovered fundamental constituents of matter. Such particles can be created when photons…

High Energy Astrophysical Phenomena · Physics 2025-08-19 Denys Malyshev , Lidiia Zadorozhna , Yuriy Bidasyuk , Andrea Santangelo , Oleg Ruchayskiy

Galactic dark matter may consist of axionlike particles (ALPs) that can be described as an "ultralight bosonic field" oscillating at the ALP Compton frequency. The ALP field can be searched for using nuclear magnetic resonance (NMR), where…

Axion-like particles are a broad class of dark matter candidates which are expected to behave as a coherent, classical field with a weak coupling to photons. Research into the detectability of these particles with laser interferometers has…

High Energy Physics - Phenomenology · Physics 2019-08-07 Hongwan Liu , Brodi D. Elwood , Matthew Evans , Jesse Thaler

Axions and axion-like particles (ALPs) are well-motivated dark matter (DM) candidates that couple to photons in external magnetic fields. The parameter space around $m_a \sim 50~\mu$eV remains largely unexplored by haloscope experiments. We…

High Energy Physics - Experiment · Physics 2025-10-09 Josep Maria Batllori , Michael Frosz , Dieter Horns , Marios Maroudas

Quantum sensors based on the superposition of neutral atoms are promising for sensing the nature of dark matter (DM). In this study, we utilize the Stern-Gerlach (SG) interferometer configuration to seek a novel method for the detection of…

High Energy Physics - Phenomenology · Physics 2023-01-24 Milad Hajebrahimi , Hassan Manshouri , Mohammad Sharifian , Moslem Zarei

We provide an introduction to searches for axions and Axion-Like Particles (ALPs) at colliders. After covering the basics of collider physics, with a focus on production and detection of new particles, we give a rather broad introduction…

High Energy Physics - Phenomenology · Physics 2025-05-02 Michele Tammaro , Jure Zupan