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Relevant bibliographies by topics / QCD axion

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Journal articles

Academic literature on the topic 'QCD axion'

Author: Grafiati

Published: 14 March 2023

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Journal articles on the topic "QCD axion"

1

Bonnefoy, Quentin, and Emilian Dudas. "Axions and anomalous U(1)’s." International Journal of Modern Physics A 33, no. 34 (2018): 1845001. http://dx.doi.org/10.1142/s0217751x1845001x.

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Inspired by recent studies of high-scale decay constant or flavorful QCD axions, we review and clarify their existence in effective string models with anomalous U(1) gauge groups. We find that such models, when coupled to charged scalars getting vacuum expectation values, always have one light axion, whose mass can only come from nonperturbative effects. If the main nonperturbative effect is from QCD, then it becomes a Peccei–Quinn axion candidate for solving the strong CP problem. We then study simple models with universal Green–Schwarz mechanism and only one charged scalar field: in the mini

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2

Mazde, Kratika, and Luca Visinelli. "The interplay between the dark matter axion and primordial black holes." Journal of Cosmology and Astroparticle Physics 2023, no. 01 (2023): 021. http://dx.doi.org/10.1088/1475-7516/2023/01/021.

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Abstract If primordial black holes (PBHs) had come to dominate the energy density of the early Universe when oscillations in the axion field began, we show that the relic abundance and expected mass range of the QCD axion would be greatly modified. Since the QCD axion is a potential candidate for dark matter (DM), we refer to it as the DM axion. We predominantly explore PBHs in the mass range (106 - 5× 108)g. We investigate the relation between the relic abundance of DM axions and the parameter space of PBHs. We numerically solve the set of Boltzmann equations, that governs the cosmological ev

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3

Lombardo, Maria Paola, and Anton Trunin. "Topology and axions in QCD." International Journal of Modern Physics A 35, no. 20 (2020): 2030010. http://dx.doi.org/10.1142/s0217751x20300100.

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QCD axions are at the crossroads of QCD topology and Dark Matter searches. We present here the current status of topological studies on the lattice, and their implication on axion physics. We outline the specific challenges posed by lattice topology, the different proposals for handling them, the observable effects of topology on the QCD spectrum and its interrelation with chiral and axial symmetries. We review the transition to the quark–gluon plasma, the fate of topology at the transition, and the approach to the high temperature limit. We discuss the extrapolations needed to reach the regim

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4

Rosenberg, Leslie J. "Dark-matter QCD-axion searches." Proceedings of the National Academy of Sciences 112, no. 40 (2015): 12278–81. http://dx.doi.org/10.1073/pnas.1308788112.

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In the late 20th century, cosmology became a precision science. Now, at the beginning of the next century, the parameters describing how our universe evolved from the Big Bang are generally known to a few percent. One key parameter is the total mass density of the universe. Normal matter constitutes only a small fraction of the total mass density. Observations suggest this additional mass, the dark matter, is cold (that is, moving nonrelativistically in the early universe) and interacts feebly if at all with normal matter and radiation. There’s no known such elementary particle, so the strong

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5

Barman, Basabendu, Nicolás Bernal, Nicklas Ramberg, and Luca Visinelli. "QCD Axion Kinetic Misalignment without Prejudice." Universe 8, no. 12 (2022): 634. http://dx.doi.org/10.3390/universe8120634.

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The axion field, the angular direction of the complex scalar field associated with the spontaneous symmetry breaking of the Peccei–Quinn (PQ) symmetry, could have originated with initial non-zero velocity. The presence of a non-zero angular velocity resulting from additional terms in the potential that explicitly break the PQ symmetry has important phenomenological consequences such as a modification of the axion mass with respect to the conventional PQ framework or an explanation for the observed matter-antimatter asymmetry. We elaborate further on the consequences of the “kinetic misalignmen

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6

Moore, Guy. "Axion dark matter and the Lattice." EPJ Web of Conferences 175 (2018): 01009. http://dx.doi.org/10.1051/epjconf/201817501009.

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First I will review the QCD theta problem and the Peccei-Quinn solution, with its new particle, the axion. I will review the possibility of the axion as dark matter. If PQ symmetry was restored at some point in the hot early Universe, it should be possible to make a definite prediction for the axion mass if it constitutes the Dark Matter. I will describe progress on one issue needed to make this prediction – the dynamics of axionic string-wall networks and how they produce axions. Then I will discuss the sensitivity of the calculation to the high temperature QCD topological susceptibility. My

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7

Zhang, Hong. "Axion Stars." Symmetry 12, no. 1 (2019): 25. http://dx.doi.org/10.3390/sym12010025.

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The dark matter particle can be a QCD axion or axion-like particle. A locally over-densed distribution of axions can condense into a bound Bose–Einstein condensate called an axion star, which can be bound by self-gravity or bound by self-interactions. It is possible that a significant fraction of the dark matter axion is in the form of axion stars. This would make some efforts searching for the axion as the dark matter particle more challenging, but at the same time it would also open up new possibilities. Some of the properties of axion stars, including their emission rates and their interact

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8

D'Eramo, Francesco, Eleonora Di Valentino, William Giarè, et al. "Cosmological bound on the QCD axion mass, redux." Journal of Cosmology and Astroparticle Physics 2022, no. 09 (2022): 022. http://dx.doi.org/10.1088/1475-7516/2022/09/022.

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Abstract We revisit the joint constraints in the mixed hot dark matter scenario in which both thermally produced QCD axions and relic neutrinos are present. Upon recomputing the cosmological axion abundance via recent advances in the literature, we improve the state-of-the-art analyses and provide updated bounds on axion and neutrino masses. By avoiding approximate methods, such as the instantaneous decoupling approximation, and limitations due to the limited validity of the perturbative approach in QCD that forced to artificially divide the constraints from the axion-pion and the axion-gluon

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9

Kitajima, Naoya, Kazuhiro Kogai, and Yuko Urakawa. "New scenario of QCD axion clump formation. Part I. Linear analysis." Journal of Cosmology and Astroparticle Physics 2022, no. 03 (2022): 039. http://dx.doi.org/10.1088/1475-7516/2022/03/039.

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Abstract The QCD axion acquires the potential through the non-perturbative effect of the QCD matters around the QCD phase transition. During this period, the direct interaction between the axion and the QCD matters sets in. Focusing on the impact of this direct interaction, we propose two scenarios where the fluctuation of the axion can rapidly grow, potentially leading to the formation of axion miniclusters even if the Peccei-Quinn (PQ) symmetry was already broken during inflation. The first scenario assumes that the primordial curvature perturbation at the horizon scale during the QCD epoch

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10

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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