scholarly journals Strong Limits on the DFSZ Axion Mass with G117‐B15A

2008 ◽  
Vol 675 (2) ◽  
pp. 1512-1517 ◽  
Author(s):  
A. Bischoff‐Kim ◽  
M. H. Montgomery ◽  
D. E. Winget
Keyword(s):  
Axion Mass

scholarly journals A composite Higgs with a heavy composite axion

2020 ◽  
Vol 2020 (12) ◽  
Author(s):  
Tony Gherghetta ◽  
Minh D. Nguyen
Keyword(s):  
Cp Violation ◽  
Gauge Group ◽  
Scalar Fields ◽  
Higgs Model ◽  
Global Symmetry ◽  
Color Group ◽  
High Scale ◽  
Axion Mass ◽  
Composite Higgs ◽  
The Standard Model

Abstract We consider the strong dynamics associated with a composite Higgs model that simultaneously produces dynamical axions and solves the strong CP problem. The strong dynamics arises from a new Sp or SU(4) hypercolor gauge group containing QCD colored hyperfermions that confines at a high scale. The hypercolor global symmetry is weakly gauged by the Standard Model electroweak gauge group and an enlarged color group, SU(N + 3) × SU(N)′. When hyperfermion condensates form, they not only lead to an SU(5)/SO(5) composite Higgs model but also spontaneously break the enlarged color group to SU(3)c× SU(N)D. At lower energies, the SU(N)D group confines, producing two dynamical axions that eliminates all CP violation. Furthermore, small instantons from the SU(N)′ group can enhance the axion mass, giving rise to TeV scale axion masses that can be detected at collider experiments. Our model provides a way to unify the composite Higgs with dynamical axions, without introducing new elementary scalar fields, while also extending the range of axion masses that addresses the strong CP problem.

scholarly journals Accidental SO(10) axion from gauged flavour

2020 ◽  
Vol 2020 (11) ◽  
Author(s):  
Luca Di Luzio
Keyword(s):  
Mass Window ◽  
High Quality ◽  
High Scale ◽  
Quality Problem ◽  
Axion Mass ◽  
Grand Unified Theories ◽  
Unified Theories ◽  
Canonical Dimension ◽  
General Perspective ◽  
Effective Operators

Abstract An accidental U(1) Peccei-Quinn (PQ) symmetry automatically arises in a class of SO(10) unified theories upon gauging the SU(3)f flavour group. The PQ symmetry is protected by the ℤ4 × ℤ3 center of SO(10) × SU(3)f up to effective operators of canonical dimension six. However, high-scale contributions to the axion potential posing a PQ quality problem arise only at d = 9. In the pre-inflationary PQ breaking scenario the axion mass window is predicted to be ma ∈ [7 × 10−8, 10−3] eV, where the lower end is bounded by the seesaw scale and the upper end by iso-curvature fluctuations. A high-quality axion, that is immune to the PQ quality problem, is obtained for ma ≳ 2 0.02 eV. We finally offer a general perspective on the PQ quality problem in grand unified theories.

scholarly journals Axion mass prediction from minimal grand unification

2018 ◽  
Vol 98 (9) ◽  
Author(s):  
Luca Di Luzio ◽  
Andreas Ringwald ◽  
Carlos Tamarit
Keyword(s):  
Grand Unification ◽  
Axion Mass

scholarly journals Search for Spin-Dependent Short-Range Interaction with an 3He/129Xe Clock Comparison Experiment

2016 ◽  
Vol 40 ◽  
pp. 1660083 ◽  
Author(s):  
Kathlynne Tullney ◽  
Werner Heil ◽  
Sergei Karpuk ◽  
Yuri Sobolev ◽  
Fabian Allmendinger ◽  
...  
Keyword(s):  
Nucleon Nucleon ◽  
Free Precession ◽  
Nuclear Spins ◽  
Range Interaction ◽  
Axion Mass ◽  
Upper Limit ◽  
Spin Polarized ◽  
Pseudoscalar Coupling ◽  
Nucleon Nucleon Interaction ◽  
Clock Comparison

We performed an experiment to search for a new spin-dependent P- and T-violating nucleon–nucleon interaction [Formula: see text] which is mediated by light pseudoscalar bosons such as axions or axionlike particles. This interaction causes a shift [Formula: see text] in the precession frequency of nuclear spin polarized gases in the presence of an unpolarized mass. In order to measure this frequency shift a 3He/[Formula: see text]Xe comagnetometer was used which is based on the detection of free precession of 3He and [Formula: see text]Xe nuclear spins using SQUIDs as detectors. For the upper limit of [Formula: see text] we obtained 7.1[Formula: see text]nHz. With this value, an upper limit of the scalar-pseudoscalar coupling of the axion to the spin of a bound neutron could be deduced within the axion mass window. For axion masses between 2 and 500[Formula: see text][Formula: see text]eV, the laboratory upper bounds were improved by up to 4 orders of magnitude.

scholarly journals Probing ultra-light axion dark matter from 21 cm tomography using Convolutional Neural Networks

2022 ◽  
Vol 2022 (01) ◽  
pp. 020
Author(s):  
Cristiano G. Sabiu ◽  
Kenji Kadota ◽  
Jacobo Asorey ◽  
Inkyu Park
Keyword(s):  
Dark Matter ◽  
Temperature Field ◽  
Brightness Temperature ◽  
Neutral Hydrogen ◽  
Mass Range ◽  
Training Data ◽  
Small Scale ◽  
Axion Mass ◽  
Density Perturbations ◽  
Square Kilometer Array

Abstract We present forecasts on the detectability of Ultra-light axion-like particles (ULAP) from future 21 cm radio observations around the epoch of reionization (EoR). We show that the axion as the dominant dark matter component has a significant impact on the reionization history due to the suppression of small scale density perturbations in the early universe. This behavior depends strongly on the mass of the axion particle. Using numerical simulations of the brightness temperature field of neutral hydrogen over a large redshift range, we construct a suite of training data. This data is used to train a convolutional neural network that can build a connection between the spatial structures of the brightness temperature field and the input axion mass directly. We construct mock observations of the future Square Kilometer Array survey, SKA1-Low, and find that even in the presence of realistic noise and resolution constraints, the network is still able to predict the input axion mass. We find that the axion mass can be recovered over a wide mass range with a precision of approximately 20%, and as the whole DM contribution, the axion can be detected using SKA1-Low at 68% if the axion mass is M X < 1.86 × 10-20 eV although this can decrease to M X < 5.25 × 10-21 eV if we relax our assumptions on the astrophysical modeling by treating those astrophysical parameters as nuisance parameters.

Robustness of cosmological thermal axion mass bounds

2017 ◽  
Author(s):  
Eleonora Di Valentino ◽  
Stefano Gariazzo ◽  
Elena Giusarma ◽  
Olga Mena
Keyword(s):  
Axion Mass
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