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Articoli di riviste sul tema "Axions"

Autore: Grafiati
Pubblicato: 4 giugno 2021
Ultima modifica: 26 luglio 2025

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1

Lee, Junseok, Kai Murai, Fuminobu Takahashi, and Wen Yin. "Bubble misalignment mechanism for axions." Journal of Cosmology and Astroparticle Physics 2024, no. 05 (2024): 122. http://dx.doi.org/10.1088/1475-7516/2024/05/122.

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Abstract (sommario):
Abstract We study the dynamics of axions at first-order phase transitions in non-Abelian gauge theories. When the duration of the phase transition is short compared to the timescale of the axion oscillations, the axion dynamics is similar to the trapped misalignment mechanism. On the other hand, if this is not the case, the axions are initially expelled from the inside of the bubbles, generating axion waves on the outside. Analogous to the Fermi acceleration, these axions gain energy by repeatedly scattering off the bubble walls. Once they acquire enough energy, they can enter the bubbles. If
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2

Gnedin, Yu N., and M. Yu Piotrovich. "New results in searching for axions by astronomical methods." International Journal of Modern Physics A 31, no. 02n03 (2016): 1641019. http://dx.doi.org/10.1142/s0217751x16410190.

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We discuss the astronomical methods of searching for light Goldstone bosons (axions and arions). The basic idea is to use processes of coupling between axions and photons: a) the axion decay into two photons; b) the transformation process of photons into axions (arions) in the magnetic fields of stars and also of interstellar and intergalactic media; c) the inverse process of transformations of axions (arions) which are generated into cores of stars into X-ray photons. The decaying axions affect upon the diffuse extragalactic background radiation, the brightness of the night sky and especially
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3

Flambaum, V. V., H. B. Tran Tan, I. B. Samsonov, Y. V. Stadnik, and D. Budker. "Resonant detection and production of axions with atoms." International Journal of Modern Physics A 33, no. 31 (2018): 1844030. http://dx.doi.org/10.1142/s0217751x1844030x.

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The axions and axion-like particles can be detected via a resonant atomic or molecular transition induced by axion absorption. The signal obtained in this process is second order in the axion-electron interaction constant and hence small. In this chapter, it is demonstrated that this signal may become first order in the axion-electron interaction constant if we allow the interference between the axion-induced transition amplitude and the transition amplitude induced by the electromagnetic radiation. Additionally, we show that the conventional scheme of producing axions from photons in a magnet
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4

Chen, Liang, and Thomas W. Kephart. "A Review of Axion Lasing in Astrophysics." Universe 10, no. 1 (2024): 24. http://dx.doi.org/10.3390/universe10010024.

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Axions can be stimulated to decay into photons by ambient photons of the right frequency or by photons from the decay of neighboring axions. If the axion density is high enough, the photon intensity can be amplified, which is a type of lasing or an axion maser. Here, we review the astrophysical situations where axion lasing can appear and possibly be detected.
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5

SIKIVIE, P. "DARK MATTER AXIONS." International Journal of Modern Physics A 25, no. 02n03 (2010): 554–63. http://dx.doi.org/10.1142/s0217751x10048846.

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Abstract (sommario):
The hypothesis of an 'invisible' axion was made by Misha Shifman and others, approximately thirty years ago. It has turned out to be an unusually fruitful idea, crossing boundaries between particle physics, astrophysics and cosmology. An axion with mass of order 10-5 eV (with large uncertainties) is one of the leading candidates for the dark matter of the universe. It was found recently that dark matter axions thermalize and form a Bose-Einstein condensate (BEC). Because they form a BEC, axions differ from ordinary cold dark matter (CDM) in the non-linear regime of structure formation and upon
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6

Massó, Eduard. "Axions and axion-like particles." Nuclear Physics B - Proceedings Supplements 114 (February 2003): 67–73. http://dx.doi.org/10.1016/s0920-5632(02)01893-5.

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7

Lee, Junseok, Kai Murai, Fuminobu Takahashi, and Wen Yin. "Induced domain walls of QCD axion, and gravitational waves." Journal of Cosmology and Astroparticle Physics 2024, no. 10 (2024): 038. http://dx.doi.org/10.1088/1475-7516/2024/10/038.

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Abstract We show that heavy axion domain walls induce domain walls of the QCD axion through a mixing between the heavy axion and the QCD axion, even when the pre-inflationary initial condition is assumed for the QCD axion. The induced domain walls arise because the effective θ parameter changes across the heavy axion domain walls, shifting the potential minimum of the QCD axion. When the heavy axion domain walls collapse, the induced QCD axion domain walls collapse as well. This novel mechanism for producing the QCD axions can explain dark matter even with the axion decay constant as small as
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8

D’Eramo, Francesco. "Thermal Axions: What’s next?" EPJ Web of Conferences 274 (2022): 01007. http://dx.doi.org/10.1051/epjconf/202227401007.

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Scattering and decay processes of thermal bath particles in the early universe can dump relativistic axions in the primordial plasma. If produced with a significant abundance, their presence can leave observable signatures in cosmological observables probing both the early and the late universe. We focus on the QCD axion and present recent and significant improvements for the calculation of the axion production rate across the different energy scales during the expansion of the universe. We apply these rates to predict the abundance of produced axions and to derive the latest cosmological boun
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9

Galan, Javier. "Exploring the Sun’s core with BabylAXO." Journal of Physics: Conference Series 2156, no. 1 (2021): 012014. http://dx.doi.org/10.1088/1742-6596/2156/1/012014.

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Abstract (sommario):
Abstract Axions are a natural consequence of the Peccei-Quinn mechanism, the most compelling solution to the strong-CP problem. Similar axion-like particles (ALPs) also appear in a number of possible extensions of the Standard Model, notably in string theories. Both, axions and ALPs, are very well motivated candidates for Dark Matter (DM), and they would be copiously produced at the sun’s core. A relevant effort during the last two decades has been the CAST experiment at CERN, the most sensitive axion helioscope to date. The International Axion Observatory (IAXO) is a large-scale 4th generatio
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10

Di Luzio, Luca. "Flavour Violating Axions." EPJ Web of Conferences 234 (2020): 01005. http://dx.doi.org/10.1051/epjconf/202023401005.

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I review the physics case for flavour violating axions. In particular, I argue that relaxing the assumption of the universality of the Peccei-Quinn current opens up new pathways, including: the relaxation of the Supernova bound on the axion mass, a possible connection with the Standard Model flavour puzzle and the experimental opportunity of discovering the axion via flavoured axion searches.
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11

Yang, Qiaoli. "Axions/Axion-like particles and the CMB asymmetric dipole." International Journal of Modern Physics D 24, no. 13 (2015): 1545009. http://dx.doi.org/10.1142/s0218271815450091.

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Axions and axion-like particles (ALPs) are very attractive dark matter candidates. In this review, we briefly investigate how the cosmological observations reveal the existence of dark matter and some unique properties of axions/(ALPs) which make them more interesting.
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12

McDonald, J. I., B. Garbrecht, and P. Millington. "Axion-photon conversion in 3D media and astrophysical plasmas." Journal of Cosmology and Astroparticle Physics 2023, no. 12 (2023): 031. http://dx.doi.org/10.1088/1475-7516/2023/12/031.

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Abstract With axions now a primary candidate for dark matter, understanding their indirect astrophysical signatures is of paramount importance. Key to this is the production of photons from axions in magnetised astrophysical plasmas. While simple formulae for axion-photon mixing in 1D have been sketched several decades ago, there has recently been renewed interest in robust calculations for this process in arbitrary 3D plasmas. These calculations are vital for understanding, amongst other things, the radio production from axion dark matter conversion in neutron stars, which may lead to indirec
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13

BRHLIK, MICHAL, DANIEL J. H. CHUNG, and GORDON L. KANE. "WEIGHING THE UNIVERSE WITH ACCELERATORS AND DETECTORS." International Journal of Modern Physics D 10, no. 03 (2001): 367–79. http://dx.doi.org/10.1142/s0218271801000998.

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Suppose the lightest superpartner (LSP) is observed at colliders, and WIMPs are detected in explicit experiments. We point out that one cannot immediately conclude that cold dark matter (CDM) of the universe has been observed, and we determine what measurements are necessary before such a conclusion is meaningful. We discuss the analogous situation for neutrinos and axions; in the axion case we have not found a way to conclude axions are the CDM even if axions are detected.
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14

Gendler, Naomi, David J. E. Marsh, Liam McAllister, and Jakob Moritz. "Glimmers from the axiverse." Journal of Cosmology and Astroparticle Physics 2024, no. 09 (2024): 071. http://dx.doi.org/10.1088/1475-7516/2024/09/071.

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Abstract We study axion-photon couplings in compactifications of type IIB string theory. We find that these couplings are systematically suppressed compared to the inverse axion periodicity, as a result of two effects. First, couplings to the QED theta angle are suppressed for axion mass eigenstates that are light compared to the mass scale set by stringy instantons on the cycle supporting QED. Second, in compactifications with many axions the intersection matrix is sparse, making kinetic mixing weak. We study the resulting phenomenology in an ensemble of 200,000 toy models constructed from th
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15

Reig, Mario. "Maximally misaligned axions." Journal of Physics: Conference Series 2156, no. 1 (2021): 012012. http://dx.doi.org/10.1088/1742-6596/2156/1/012012.

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Abstract (sommario):
Abstract I discuss a simple model of maximal axion misalignment. Maximally-misaligned axions with ma > 10−22 eV are compelling DM candidates with a rich and interesting phenomenology. On the other hand, maximally-misaligned axions lighter than m ∼ O(100)H 0 may behave as dark energy with decay constants substantially smaller than the Planck scale, avoiding consistency problems associated to trans-Planckian scales.
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16

Capolupo, Antonio, Salvatore Marco Giampaolo, and Aniello Quaranta. "Axion like particles, fifth force and neutron interferometry." Journal of Physics: Conference Series 2533, no. 1 (2023): 012044. http://dx.doi.org/10.1088/1742-6596/2533/1/012044.

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Abstract We report on recent result according to which the fermion-fermion interaction mediated by axions and axion–like particles can be revealed by means of neutron interferometry. We assume that the initial neutron beam is split in two beams which are affected by differently oriented magnetic fields, in order that the phase difference depends only by the axion–induced interaction. In this way, the phase difference is directly related to the presence of axions.
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17

Nesterov, Alexander I. "Primordial Axion Stars and Galaxy Halo Formation." Universe 10, no. 9 (2024): 369. http://dx.doi.org/10.3390/universe10090369.

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Primordial axion stars, hypothetical stars formed from axions, could play an essential role in forming galaxy halos. These stars could have originated in the early universe shortly after the Big Bang. We show that the ultralight axions forming primordial stars can act as the initial seeds for galaxy halos.
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18

Burrows, Adam, M. Ted Ressell, and Michael S. Turner. "Axions and SN 1987A: Axion trapping." Physical Review D 42, no. 10 (1990): 3297–309. http://dx.doi.org/10.1103/physrevd.42.3297.

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19

Branco, Nuno P., Ricardo Z. Ferreira, and João G. Rosa. "Superradiant axion clouds around asteroid-mass primordial black holes." Journal of Cosmology and Astroparticle Physics 2023, no. 04 (2023): 003. http://dx.doi.org/10.1088/1475-7516/2023/04/003.

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Abstract We analyze the dynamics and observational signatures of axion clouds formed via the superradiant instability around primordial black holes, focusing on the mass range 1014 - 1018 kg where the latter may account for all the dark matter. We take into account the leading effects of axion self-interactions, showing that, even though these limit the number of axions produced within each cloud, a large number of superradiant axions become free of the black hole's gravitational potential and accumulate in the intergalactic medium or even in the host galaxy, depending on their escape velocity
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20

Civitarese, Osvaldo, Milva G. Orsaria, and Ana V. Penacchioni. "From Axion—Neutrino Couplings to Axion Thermodynamics: Testing the Axion Mass Hierarchy." Symmetry 17, no. 5 (2025): 680. https://doi.org/10.3390/sym17050680.

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Abstract (sommario):
The composition and physical state of dark matter remain among the most pressing unresolved questions in modern physics. Addressing these questions is crucial to our understanding of the Universe’s structure. In this work, we explore the hypothesis that massive scalar bosons, such as axions, constitute the majority of dark matter. We focus on two key aspects of axion physics: (i) the role of axion–neutrino coupling in generating neutrino mass and (ii) the thermodynamic properties of axion dark matter. We propose that the interaction between neutrinos and axions in the early Universe, prior to
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21

Li, Hai-Jun. "Axion dark matter with explicit Peccei-Quinn symmetry breaking in the axiverse." Journal of Cosmology and Astroparticle Physics 2024, no. 09 (2024): 025. http://dx.doi.org/10.1088/1475-7516/2024/09/025.

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Abstract It was shown that the required high quality of the Peccei-Quinn (PQ) symmetry can be a natural outcome of the multiple QCD axions model. In the axiverse, a hypothetical mass mixing between the QCD axions and axion-like particles (ALPs) can occur, which leads to an interesting phenomenon called the level crossing. In this paper, we investigate this mass mixing between one QCD axion and one ALP with the explicit PQ symmetry breaking in the early Universe. The dynamics of the axions and their cosmological evolutions when the level crossing occurs in this scenario are studied in detail. W
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22

Rogers, Keir K., Renée Hložek, Alex Laguë, et al. "Ultra-light axions and the S 8 tension: joint constraints from the cosmic microwave background and galaxy clustering." Journal of Cosmology and Astroparticle Physics 2023, no. 06 (2023): 023. http://dx.doi.org/10.1088/1475-7516/2023/06/023.

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Abstract We search for ultra-light axions as dark matter (DM) and dark energy particle candidates, for axion masses 10-32 eV ≤ m a ≤ 10-24 eV, by a joint analysis of cosmic microwave background (CMB) and galaxy clustering data — and consider if axions can resolve the tension in inferred values of the matter clustering parameter S 8. We give legacy constraints from Planck 2018 CMB data, improving 2015 limits on the axion density Ωa h 2 by up to a factor of three; CMB data from the Atacama Cosmology Telescope and the South Pole Telescope marginally weaken Planck bounds at m a = 10-25 eV, owing t
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23

GNEDIN, YU N. "CURRENT STATUS OF MODERN DARK MATTER PROBLEM." International Journal of Modern Physics A 17, no. 29 (2002): 4251–60. http://dx.doi.org/10.1142/s0217751x02013290.

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The basic methods of searching for dark matter candidates are discussed. The main topics of this talk are: (a) ground - based cavity experiments with searching for galactic axions; (b) searching for hadronic axion decay line into galactic and extragalactic light; (c) experimental search for solar and stellar axions; (d) basic methods of searching for WIMPs as candidates into dark matter; (e) limits on axion and WIMP masses and their coupling constants to photons and ordinary matter; (f) novels of searching for nonbaryonic dark matter.
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24

Sîrbu, Anca. "On the Sunday Axion and on The Athonite Axionar." ARTES. JOURNAL OF MUSICOLOGY 30, no. 29-30 (2024): 257–72. http://dx.doi.org/10.35218/ajm-2024-0015.

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Abstract (sommario):
A valuable volume of psaltic music is about to be printed soon. It is a new collection of Axions, elaborated in the “St. Gheorghe” Romanian cell - Kapsala in the Holy Mountain. The collection contains works by older (19th century) or contemporary Greek composers. Most of the Greek axions belong to an Athonite monk who wished to remain anonymous and who entrusted Father Gheorghe from the “St. Gheorghe - Livadogheni” Romanian cell on Holy Mount Athos with a valuable collection of personal axions, to be adapted and printed. It is so that these axions are now being printed for the first time direc
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25

Zhao, Wenhao, and Yuqi Zhu. "The properties of axion with three different sets of parameters in two flavor Nambu-Jona-Lasinio model." Journal of Physics: Conference Series 2882, no. 1 (2024): 012061. http://dx.doi.org/10.1088/1742-6596/2882/1/012061.

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Abstract While the properties of axions have been studied primarily through high-energy physics and cosmology, there are some potential connections between the research results and the aerospace field. We study the properties of axions in hot and dense matter with three different sets of parameters in the Nambu-Jona-Lasinio model, including axion mass and self-coupling. We discussed axion mass and self-coupling, noting that axion properties are very sensitive to chiral phase transitions for three sets of parameters. The axion mass and self-coupling rapidly decrease in the chiral crossover regi
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26

Kachelrieß, M., and J. Tjemsland. "On the origin and the detection of characteristic axion wiggles in photon spectra." Journal of Cosmology and Astroparticle Physics 2022, no. 01 (2022): 025. http://dx.doi.org/10.1088/1475-7516/2022/01/025.

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Abstract Photons propagating in an external magnetic field may oscillate into axions or axion-like particles (ALPs). Such oscillations will lead to characteristic features in the energy spectrum of high-energy photons from astrophysical sources that can be used to probe the existence of ALPs. In this work, we revisit the signatures of these oscillations and stress the importance of a proper treatment of turbulent magnetic fields. We implement axions into ELMAG, a standard tool for modelling in a Monte Carlo framework the propagation of gamma-rays in the Universe, complementing thereby the usua
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27

Roy, Sourov, Pratick Sarkar, Subhadip Sau, and Soumitra SenGupta. "Exploring axions through the photon ring of a spherically symmetric black hole." Journal of Cosmology and Astroparticle Physics 2023, no. 11 (2023): 099. http://dx.doi.org/10.1088/1475-7516/2023/11/099.

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Abstract In this study, we examine the phenomenon of photon axion conversion occurring in the spacetime surrounding a black hole. Specifically, we focus on the potential existence of a magnetic field around the supermassive black hole M87*, which could facilitate the conversion of photons into axions in close proximity to the photon sphere. While photons traverse through the curved spacetime, they spend time near the photon sphere, where conversion of these photons into axions takes place. Consequently, this process leads to a decrease in the intensity of the black hole's photon ring. To explo
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28

Anzuini, Filippo, and Angelo Maggi. "Axions and primordial magnetogenesis: the role of initial axion inhomogeneities." Journal of Cosmology and Astroparticle Physics 2024, no. 08 (2024): 011. http://dx.doi.org/10.1088/1475-7516/2024/08/011.

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Abstract The relic density of dark matter in the ΛCDM model restricts the parameter space for a cosmological axion field, constraining the axion decay constant, the initial amplitude of the axion field and the axion mass. It is shown via lattice simulations how the relic density of axion-like particles with masses close to the one of the QCD axion is affected by axion-gauge field interactions and by initial axion inhomogeneities. For pre-inflationary axions, once the Hubble parameter becomes smaller than the axion mass, the latter starts to oscillate, and part of its energy density is spent pr
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29

Lee, Chang, Xiaoyue LiJ, Derek Strom, and Olaf Reimann. "MADMAX: a QCD dark matter axion direct-detection experiment." Journal of Physics: Conference Series 2156, no. 1 (2021): 012041. http://dx.doi.org/10.1088/1742-6596/2156/1/012041.

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Abstract Peccei and Quinn proposed axions to solve the strong CP problem. Axions later turned out to be an excellent candidate for cold dark matter. They may have a mass of around 100 μeV if generated after cosmic inflation. The MADMAX collaboration aims to detect post-inflationary QCD axion using a new detector concept, the dielectric haloscope. It detects axion-induced traveling waves from boundaries of different media, boosted by layers of dielectrics. We report the current progress and future measurement plan for a proof-of-principle setup. We also report the current development of the pro
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30

Ogluzdin, Valeriy Evgenjevich. "The Role of Axions in the Formation of the Photoluminescence Spectrum in Dispersive Media." Foundations 2, no. 1 (2022): 184–98. http://dx.doi.org/10.3390/foundations2010011.

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In the review, based on the analysis of the results published in the works of domestic and foreign researchers, a variant of an unconventional interpretation of the photoluminescence of dispersive media in the energy range of 0.5–3 eV is proposed. The interpretation meets the requirements of the energy conservation law for photons and axions participating in the photoluminescence process. The participation of axions in the process is consistent with Primakov’s hypothesis. The role of nonradiative relaxation at the stage of axion decay is noted. The axion lifetimes are estimated for a number of
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31

Maseizik, Dennis, Sagnik Mondal, Hyeonseok Seong, and Günter Sigl. "Radio lines from accreting axion stars." Journal of Cosmology and Astroparticle Physics 2025, no. 05 (2025): 033. https://doi.org/10.1088/1475-7516/2025/05/033.

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Abstract (sommario):
Abstract Axion-like particles, which we call axions, can compose the missing dark matter and may form substructures such as miniclusters and axion stars. We obtain the mass distributions of axion stars derived from their host miniclusters in our galaxy and find a significant number of axion stars reaching the decay mass, the critical mass set by the axion-photon coupling. Axion stars that have reached the decay mass can accrete surrounding axions either via or directly from their host miniclusters, subsequently converting them into radio photons through parametric resonance. We demonstrate tha
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32

Giannotti, Maurizio. "Aspects of Axions and ALPs Phenomenology." Journal of Physics: Conference Series 2502, no. 1 (2023): 012003. http://dx.doi.org/10.1088/1742-6596/2502/1/012003.

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Abstract (sommario):
Abstract The physics of axions and axion-like particles (ALPs) is enjoying an incredibly productive period, with many new experimental proposals, theoretical idea, and original astrophysical and cosmological arguments which help the search effort. The large number of experimental proposals is likely to lead to fundamental advances (perhaps, a discovery?) in the coming years. The aim of this article is to provide a very brief overview of some of the recent developments in axions and ALP phenomenology, and to discuss some relevant aspects in this important field. A particular attention is given
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Chang, Chia-Feng, and Yanou Cui. "Dynamics of long-lived (axionic) domain walls and its cosmological implications." Journal of Cosmology and Astroparticle Physics 2025, no. 06 (2025): 027. https://doi.org/10.1088/1475-7516/2025/06/027.

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Abstract (sommario):
Abstract We perform an updated analysis on a long-lived domain wall (DW) network, which may apply to a broad class of axion models. By simulating an axion-like scalar field on a 3D lattice and fitting an analytical model for the DW evolution, we identify the leading energy loss mechanisms of the DWs and compute the spectrum of axions emitted from the network. The contribution from the DWs to axion-like dark matter (DM) density is derived, with viable parameter space given. The application to both QCD axions and general axion-like particles (ALPs) is considered. Due to the new approaches taken,
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34

Qu, Mingrui. "The Principle and Detection Progress of Axion Dark Matter." Highlights in Science, Engineering and Technology 17 (November 10, 2022): 308–12. http://dx.doi.org/10.54097/hset.v17i.2620.

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Detection of the axion is a significant yet challenging discovery for particle physics and astrophysics. Based on information retrieval and interpretation of results, a summary of state-of-art detection methods could be achieved, and future progress and be predicted. Although the axion suffices for its properties of hidden nature and impact on gravity, which leads to the difficulty of detection. There are currently several candidates for the detection of axions: cavity microwave experiments, solar axion searches, and radio telescope searches. With progress on all of these detection methods, an
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35

Allen, Theodore J., Mark J. Bowick, and Amitabha Lahiri. "Axionic black holes from massive axions." Physics Letters B 237, no. 1 (1990): 47–51. http://dx.doi.org/10.1016/0370-2693(90)90459-j.

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36

Laguë, A., J. R. Bond, R. Hložek, K. K. Rogers, D. J. E. Marsh, and D. Grin. "Constraining ultralight axions with galaxy surveys." Journal of Cosmology and Astroparticle Physics 2022, no. 01 (2022): 049. http://dx.doi.org/10.1088/1475-7516/2022/01/049.

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Abstract (sommario):
Abstract Ultralight axions and other bosons are dark matter candidates present in many high energy physics theories beyond the Standard Model. In particular, the string axiverse postulates the existence of up to 𝒪(100) light scalar bosons constituting the dark sector. We test the validity of the effective field theory of large-scale structure approach to mixed ultralight axion dark matter by making our own mock galaxy catalogs and find an anisotropic ultralight axion signature in the galaxy quadrupole. We use the Fourier-space galaxy clustering statistics from the Baryon Oscillation Spectrosco
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37

Arias, Paola, Nicolás Bernal, Dimitrios Karamitros, Carlos Maldonado, Leszek Roszkowski, and Moira Venegas. "New opportunities for axion dark matter searches in nonstandard cosmological models." Journal of Cosmology and Astroparticle Physics 2021, no. 11 (2021): 003. http://dx.doi.org/10.1088/1475-7516/2021/11/003.

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Abstract We study axion dark matter production from a misalignment mechanism in scenarios featuring a general nonstandard cosmology. Before the onset of Big Bang nucleosynthesis, the energy density of the universe is dominated by a particle field ϕ described by a general equation of state ω. The ensuing enhancement of the Hubble expansion rate decreases the temperature at which axions start to oscillate, opening this way the possibility for axions heavier than in the standard window. This is the case for kination, or in general for scenarios with ω > 1/3. However, if ω < 1/3, as in the c
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38

Eby, Joshua, Peter Suranyi, and L. C. R. Wijewardhana. "The lifetime of axion stars." Modern Physics Letters A 31, no. 15 (2016): 1650090. http://dx.doi.org/10.1142/s0217732316500905.

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We investigate the decay of condensates of scalars in a field theory defined by [Formula: see text], where [Formula: see text] and [Formula: see text] are the mass and decay constant of the scalar field. An example of such a theory is that of the axion, in which case the condensates are called axion stars. The axion field, [Formula: see text], is self-adjoint. As a result, the axion number is not an absolutely conserved quantity. Therefore, axion stars are not stable and have finite lifetimes. Bound axions, localized on the volume of the star, have a coordinate uncertainty [Formula: see text],
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39

Shakeri, Soroush, and Fazlollah Hajkarim. "Probing axions via light circular polarization and event horizon telescope." Journal of Cosmology and Astroparticle Physics 2023, no. 04 (2023): 017. http://dx.doi.org/10.1088/1475-7516/2023/04/017.

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Abstract The impact of axion-like particles on the light polarization around the horizon of supermassive black hole (SMBH) is discussed in the light of the latest polarization measurement of the Event Horizon Telescope (EHT). We investigate different sources of the polarization due to axion interaction with photons and the magnetic field of SMBH. These can modify the linear and circular polarization parameters of the emitted light. We have shown that a significant circular polarization can be produced via the photon scattering from the background magnetic field with axions as off-shell particl
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40

SAHU, SARIRA. "COSMIC RAYS PROPAGATION IN AXIONIC DARK MATTER." Modern Physics Letters A 23, no. 22 (2008): 1861–68. http://dx.doi.org/10.1142/s0217732308026017.

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Abstract (sommario):
Axions are the possible candidates for the non-baryonic dark matter in the Universe. Numerical calculation suggest that, these axions clumped together to form denser objects like miniclusters and axion boson stars. We have calculated the damping of cosmic rays mainly electrons propagating in the dark halo of our own galaxy, which suppose to contains the axionic dark matter as miniclusters. Our calculation shows that almost all the high energy cosmic rays will penetrate through these objects without losing energy.
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41

Desjacques, Vincent, and Adi Nusser. "Axion core–halo mass and the black hole–halo mass relation: constraints on a few parsec scales." Monthly Notices of the Royal Astronomical Society 488, no. 4 (2019): 4497–503. http://dx.doi.org/10.1093/mnras/stz1978.

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Abstract (sommario):
ABSTRACT If the dark matter is made of ultralight axions, stable solitonic cores form at the centres of virialized haloes. In some range for the mass m of the axion particle, these cores are sufficiently compact and can mimic supermassive black holes (SMBH) residing at galactic nuclei. We use the solitonic core–halo mass relation, validated in numerical simulations, to constrain a new range of allowed axion mass from measurements of the SMBH mass in (pseudo)bulge and bulgeless galaxies. These limits are based on observations of galactic nuclei on scales smaller than 10 pc. Our analysis suggest
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42

Aja, Beatriz, Sergio Arguedas Cuendis, Ivan Arregui, et al. "The Canfranc Axion Detection Experiment (CADEx): search for axions at 90 GHz with Kinetic Inductance Detectors." Journal of Cosmology and Astroparticle Physics 2022, no. 11 (2022): 044. http://dx.doi.org/10.1088/1475-7516/2022/11/044.

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Abstract (sommario):
Abstract We propose a novel experiment, the Canfranc Axion Detection Experiment (CADEx), to probe dark matter axions with masses in the range 330–460 μeV, within the W-band (80–110 GHz), an unexplored parameter space in the well-motivated dark matter window of Quantum ChromoDynamics (QCD) axions. The experimental design consists of a microwave resonant cavity haloscope in a high static magnetic field coupled to a highly sensitive detecting system based on Kinetic Inductance Detectors via optimized quasi-optics (horns and mirrors). The experiment is in preparation and will be installed in the d
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43

Wilczek, Frank. "Axions from β to δ". Coshare Science, 28 липня 2023, 001–31. http://dx.doi.org/10.61109/cs.202307.118.

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Abstract (sommario):
Axions are hypothetical particles that were originally proposed in order to explain a key feature of fundamental physics – the remarkable accuracy of time-reversal symmetry – that the standard model, as presently understood, leaves mysterious. Later, we realized that axions also have the right properties to supply the “dark matter” needed in cosmology. Here, after very briefly reviewing the plasma haloscope idea (pursued by the ALPHA collaboration) that is brightening prospects for axion detection, I sketch three other recent developments in axion physics: the possible utility of photonic crys
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44

Choi, Kiwoon, Sang Hui Im, Hee Jung Kim, and Hyeonseok Seong. "Precision axion physics with running axion couplings." Journal of High Energy Physics 2021, no. 8 (2021). http://dx.doi.org/10.1007/jhep08(2021)058.

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Abstract (sommario):
Abstract We study the renormalization group running of axion couplings while taking into account that the Standard Model can be extended to its supersymmetric extension at a certain energy scale below the axion decay constant. We then apply our results to three different classes of axion models, i.e. KSVZ-like, DFSZ-like, and string-theoretic axions, and examine if string-theoretic axions can be distinguished from others by having a different pattern of low energy couplings to the photon, nucleons and electron. We find that the low energy couplings of string-theoretic axions have a similar pat
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45

Benabou, Joshua N., Quentin Bonnefoy, Malte Buschmann, Soubhik Kumar, and Benjamin R. Safdi. "Cosmological dynamics of string theory axion strings." Physical Review D 110, no. 3 (2024). http://dx.doi.org/10.1103/physrevd.110.035021.

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Abstract (sommario):
The quantum chromodynamics (QCD) axion may solve the strong CP problem and explain the dark matter (DM) abundance of our Universe. The axion was originally proposed to arise as the pseudo-Nambu-Goldstone boson of global U(1)PQ Peccei-Quinn (PQ) symmetry breaking, but axions also arise generically in string theory as zero modes of higher-dimensional gauge fields. In this work we show that string theory axions behave fundamentally differently from field theory axions in the early Universe. Field theory axions may form axion strings if the PQ phase transition takes place after inflation. In contr
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46

Arias-Aragón, Fernando, Maurizio Giannotti, Giovanni Grilli di Cortona, and Federico Mescia. "Axion-induced pair production: A new strategy for axion detection." Physical Review D 111, no. 4 (2025). https://doi.org/10.1103/physrevd.111.043021.

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Abstract (sommario):
We revisit and update the axion-induced pair production process in a nuclear electric field mediated by the axion-electron coupling, a+XZA→XZA+e++e−. This process emerges as one of the most efficient channels for detecting axions with energies above a few MeV in large underground detectors. It is particularly relevant for detecting axions produced in nuclear reactions, such as the p+d→He3+a(5.5 MeV) reaction in the solar pp-chain, and for axions originating in supernovae. Despite recent interest in detecting high-energy axions, the pair production process has received limited attention, even i
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47

Goodman, C., M. Guzzetti, C. Hanretty та ін. "ADMX Axion Dark Matter Bounds around 3.3 μeV with Dine-Fischler-Srednicki-Zhitnitsky Discovery Ability". Physical Review Letters 134, № 11 (2025). https://doi.org/10.1103/physrevlett.134.111002.

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Abstract (sommario):
We report the results of a QCD axion dark matter search with discovery ability for Dine-Fischler-Srednicki-Zhitnitsky (DFSZ) axions using an axion haloscope. Sub-Kelvin noise temperatures are reached with an ultralow noise Josephson parametric amplifier cooled by a dilution refrigerator. This work excludes (with a 90% confidence level) DFSZ axions with masses between 3.27 to 3.34 μeV, assuming a standard halo model with a local energy density of 0.45 GeV/cm3 made up 100% of axions. Published by the American Physical Society 2025
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48

Di Luzio, Luca, Javier Galan, Maurizio Giannotti, et al. "Probing the axion–nucleon coupling with the next generation of axion helioscopes." European Physical Journal C 82, no. 2 (2022). http://dx.doi.org/10.1140/epjc/s10052-022-10061-1.

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Abstract (sommario):
AbstractA finite axion–nucleon coupling, nearly unavoidable for QCD axions, leads to the production of axions via the thermal excitation and subsequent de-excitation of $$^{57}$$ 57 Fe isotopes in the sun. We revise the solar bound on this flux adopting the up to date emission rate, and investigate the sensitivity of the proposed International Axion Observatory IAXO and its intermediate stage BabyIAXO to detect these axions. We compare different realistic experimental options and discuss the model dependence of the signal. Already BabyIAXO has sensitivity far beyond previous solar axion search
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49

Sakurai, Kodai, and Fuminobu Takahashi. "Thermal production of axions from heavy Higgs bosons." Journal of High Energy Physics 2025, no. 4 (2025). https://doi.org/10.1007/jhep04(2025)187.

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Abstract (sommario):
Abstract We discuss the thermal production of axions in renormalizable models involving two Higgs doublet fields and a complex singlet field with a global U(1) Peccei-Quinn symmetry, i.e., DFSZ type axion models. We demonstrate that, when the reheating temperature exceeds the mass scale of heavy Higgs bosons, axions are efficiently produced through heavy Higgs boson decays and scatterings at temperatures comparable to the heavy Higgs boson mass scale. As a result, the abundance of thermally produced axions is independent of the reheating temperature, which should be contrasted with the KSVZ ax
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50

Cicoli, Michele, Veronica Guidetti, Nicole Righi, and Alexander Westphal. "Fuzzy Dark Matter candidates from string theory." Journal of High Energy Physics 2022, no. 5 (2022). http://dx.doi.org/10.1007/jhep05(2022)107.

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Abstract (sommario):
Abstract String theory has been claimed to give rise to natural fuzzy dark matter candidates in the form of ultralight axions. In this paper we revisit this claim by a detailed study of how moduli stabilisation affects the masses and decay constants of different axion fields which arise in type IIB flux compactifications. We find that obtaining a considerable contribution to the observed dark matter abundance without tuning the axion initial misalignment angle is not a generic feature of 4D string models since it requires a mild violation of the Sf ≲ MP bound, where S is the instanton action a
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