Question AXION GLUON MATTER AS DARK MATTER

[Harry Costas]

There must be a reason why they are investigating AXIONs.

[Submitted on 27 May 2025]

High-Frequency Gravitational Waves on BREAD​

Rodolfo Capdevilla, Roni Harnik, Taegyun Kim, Tom Krokotsch

The use of light axion dark matter experiments as high-frequency gravitational wave (HFGW) detectors has garnered increasing attention in recent years. We explore the capabilities of the Broadband Reflector Experiment for Axion Detection (BREAD) in probing the GW parameter space and study the directional dependence of its coverage. This detector can investigate frequencies ranging from 0.05 to 200 THz. We find that employing single photon detectors BREAD is sensitive to GWs with characteristic strains as low as 10−21 at 0.1 THz and 10−25 at 200 THz with a year exposure time, making it competitive with other proposals operating at similar frequencies.

 

[Harry Costas]

We are entering real research into Axion matter.

[Submitted on 29 May 2025]

Physics beyond the Standard Model with the DSA-2000​

Kim V. Berghaus, Yufeng Du, Vincent S. H. Lee, Anirudh Prabhu, Robert Reischke, Liam Connor, Kathryn M. Zurek

The upcoming Deep Synoptic Array 2000 (DSA-2000) will map the radio sky at 0.7−2 GHz (2.9−8.3μeV) with unprecedented sensitivity. This will enable searches for dark matter and other physics beyond the Standard Model, of which we study four cases: axions, dark photons, dark matter subhalos and neutrino masses. We forecast DSA-2000's potential to detect axions through two mechanisms in neutron star magnetospheres: photon conversion of axion dark matter and radio emission from axion clouds, developing the first analytical treatment of the latter. We also forecast DSA-2000's sensitivity to discover kinetically mixed dark photons from black hole superradiance, constrain dark matter substructure and fifth forces through pulsar timing, and improve cosmological neutrino mass inference through fast radio burst dispersion measurements. Our analysis indicates that in its planned five year run the DSA-2000 could reach sensitivity to QCD axion parameters, improve current limits on compact dark matter by an order of magnitude, and enhance cosmological weak lensing neutrino mass constraints by a factor of three.

 

[Harry Costas]

We can explain all the images created out there, far and near. By understanding the properties of transient condensates. Dark matter and Dark energy are words that mislead.

[Submitted on 5 Jun 2023]

Dark Matter Through the Axion-Gluon Portal​

Patrick J. Fitzpatrick, Yonit Hochberg, Eric Kuflik, Rotem Ovadia, Yotam Soreq

Axion-like-particles are a well-motivated extension of the Standard Model that can mediate interactions between the dark matter and ordinary matter. Here we consider an axion portal between the two sectors, where the axion couples to dark matter and to QCD gluons. We establish the relevant processes of interest across the scales of dark matter and axion masses and couplings, identify the distinct mechanisms that control the dark matter relic abundance in each case, and extract the resulting experimental signatures of the gluonic axion portal to dark matter.

 

[Harry Costas]

Axion-like particles that can be confined in a core may mimic Black Hole properties.

[Submitted on 27 May 2025 (v1), last revised 9 Jun 2025 (this version, v2)]

Concurrent Exploration of Axion-Like Particle Interactions with Gauge Bosons at the LHC​

Shirin Chenarani, Mojtaba Mohammadi Najafabadi

Concurrent Exploration of Axion-Like Particle Interactions with Gauge Bosons at the LHC

Axion-like particles (ALPs) are pseudo Nambu-Goldstone bosons associated with spontaneously broken global symmetries incorporated in the Standard Model (SM) Lagrangian in many models beyond the SM. The existence of a light ALP is plausible due to the long-standing problems that the SM has not...

arxiv.org

 

[Harry Costas]

This is quite an interesting read.

[Submitted on 9 Jul 2025]

Resolving the QCD Axion Domain Wall Problem with a Light Axion​

Junseok Lee, Kai Murai, Fuminobu Takahashi, Wen Yin

We propose two novel solutions to the domain wall problem of the QCD axion by introducing a massless or light axion that also couples to gluons. The first solution applies when the new axion forms strings after inflation. Due to its mixing with the QCD axion, domain walls of the QCD axion are bounded by these strings and confined into cosmologically safe string bundles. This scenario predicts the existence of such string bundles, which may survive until today and leave observable signatures, such as gravitational waves, cosmic birefringence, and CMB anisotropies. The simultaneous detection of the QCD axion and any of these cosmological signatures would serve as a smoking-gun signal. The second solution assumes a homogeneous initial condition for the new axion. If it is sufficiently light, its potential temporarily induces a bias in the QCD axion potential before the onset of oscillations, rendering the domain walls unstable. In both scenarios, the Peccei-Quinn mechanism remains effective, and the strong CP problem is not reintroduced. We identify the viable parameter regions and discuss the resulting dark matter abundance.

 

[Harry Costas]

Looks like the Space forum is closing