scholarly journals Gravitational waves from an axion-dark photon system: A lattice study

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Wolfram Ratzinger ◽  
Pedro Schwaller ◽  
Benjamin Stefanek
Keyword(s):  
Numerical Simulation ◽  
Dark Matter ◽  
Early Universe ◽  
Degree Of Polarization ◽  
Dark Photon ◽  
System A ◽  
Precise Prediction ◽  
Relic Abundance ◽  
Vast Range ◽  
Photon Coupling

In this work, we present a lattice study of an axion - dark photon system in the early Universe and show that the stochastic gravitational wave (GW) background produced by this system may be probed by future GW experiments across a vast range of frequencies. The numerical simulation on the lattice allows us to take into account non-linear backreaction effects and enables us to accurately predict the final relic abundance of the axion or axion-like particle (ALP) as well as its inhomogeneities, and gives a more precise prediction of the GW spectrum. Importantly, we find that the GW spectrum has more power at high momenta due to 2\rightarrow12→1 processes. Furthermore, we find the degree of polarization of the peak of the GW spectrum depends on the ALP-dark photon coupling and that the polarization can be washed out or even flipped for large values thereof. In line with recent results in the literature, we find the ALP relic abundance may be suppressed by two orders of magnitude and discuss possible extensions of the model that expand the viable parameter space. Finally, we discuss the possibility to probe ultralight ALP dark matter via spectral distortions of the CMB.

scholarly journals Relic abundance of dark photon dark matter

2020 ◽  
Vol 801 ◽  
pp. 135136 ◽  
Author(s):  
Prateek Agrawal ◽  
Naoya Kitajima ◽  
Matthew Reece ◽  
Toyokazu Sekiguchi ◽  
Fuminobu Takahashi
Keyword(s):  
Dark Matter ◽  
Dark Photon ◽  
Relic Abundance

scholarly journals Light dark photon dark matter from inflation

2020 ◽  
Vol 2020 (12) ◽  
Author(s):  
Yuichiro Nakai ◽  
Ryo Namba ◽  
Ziwei Wang
Keyword(s):  
Dark Matter ◽  
Photon Mass ◽  
Dark Photon ◽  
Photon Field ◽  
Relic Abundance ◽  
Large Wavelength

Abstract We discuss the possibility of producing a light dark photon dark matter through a coupling between the dark photon field and the inflaton. The dark photon with a large wavelength is efficiently produced due to the inflaton motion during inflation and becomes non-relativistic before the time of matter-radiation equality. We compute the amount of production analytically. The correct relic abundance is realized with a dark photon mass extending down to 10−21 eV.

scholarly journals Ultralight dark photon as a model for early Universe dark matter

2019 ◽  
Vol 100 (6) ◽  
Author(s):  
V. V. Flambaum ◽  
I. B. Samsonov
Keyword(s):  
Dark Matter ◽  
Early Universe ◽  
Dark Photon

scholarly journals Kaluza-Klein FIMP dark matter in warped extra-dimensions

2020 ◽  
Vol 2020 (9) ◽  
Author(s):  
Nicolás Bernal ◽  
Andrea Donini ◽  
Miguel G. Folgado ◽  
Nuria Rius
Keyword(s):  
Dark Matter ◽  
Standard Model ◽  
Early Universe ◽  
Extra Dimensions ◽  
The Standard Model ◽  
Massive Particles ◽  
Warped Extra Dimensions ◽  
Relic Abundance ◽  
First Time ◽  
Kaluza Klein

Abstract We study for the first time the case in which Dark Matter (DM) is made of Feebly Interacting Massive Particles (FIMP) interacting just gravitationally with the standard model particles in an extra-dimensional Randall-Sundrum scenario. We assume that both the dark matter and the standard model are localized in the IR-brane and only interact via gravitational mediators, namely the graviton, the Kaluza-Klein gravitons and the radion. We found that in the early Universe DM could be generated via two main processes: the direct freeze-in and the sequential freeze-in. The regions where the observed DM relic abundance is produced are largely compatible with cosmological and collider bounds.

scholarly journals Gravitational waves and dark photon dark matter from axion rotations

2021 ◽  
Vol 2021 (12) ◽  
Author(s):  
Raymond T. Co ◽  
Keisuke Harigaya ◽  
Aaron Pierce
Keyword(s):  
Dark Matter ◽  
Gravitational Wave ◽  
Gravitational Waves ◽  
Early Universe ◽  
Radial Direction ◽  
Particle Production ◽  
Baryon Asymmetry ◽  
Complex Field ◽  
Dark Photon ◽  
Pulsar Timing

Abstract An axion rotating in field space can produce dark photons in the early universe via tachyonic instability. This explosive particle production creates a background of stochastic gravitational waves that may be visible at pulsar timing arrays or other gravitational wave detectors. This scenario provides a novel history for dark photon dark matter. The dark photons may be warm at a level detectable in future 21-cm line surveys. For a consistent cosmology, the radial direction of the complex field containing the axion must be thermalized. We explore a concrete thermalization mechanism in detail and also demonstrate how this setup can be responsible for the generation of the observed baryon asymmetry.

scholarly journals Dark matter bound state formation in fermionic Z2 DM model with light dark photon and dark Higgs boson

2020 ◽  
Vol 2020 (10) ◽  
Author(s):  
Pyungwon Ko ◽  
Toshinori Matsui ◽  
Yi-Lei Tang
Keyword(s):  
Dark Matter ◽  
Higgs Boson ◽  
Gauge Symmetry ◽  
State Formation ◽  
Vector Boson ◽  
Goldstone Boson ◽  
Bound State ◽  
Dark Photon ◽  
Potential Matrix ◽  
Relic Abundance

Abstract If fermionic dark matter (DM) is stabilized by dark U(1) gauge symmetry that is spontaneously broken into its subgroup Z2, the particle contents of the model becomes very rich: DM and excited DM, both of them are Majorana fermions, as well as two dark force mediators, dark photon and dark Higgs boson are naturally present due to the underlying dark gauge symmetry. In this paper, we study the DM bound state formation processes within this scenario, assuming both dark photon and dark Higgs are light mediators and including the effects of excited DM. The Goldstone boson contributions to the potential matrix in the Schrödinger equations are found to be important. The emissions of a longitudinal vector boson (or somehow equivalently a Goldstone boson) during the DM bound state formations are crucial to induce a significant reannihilation process, reducing the dark matter relic abundance. Most of the stringent constraints for this kind of dark matter considered in the literature are simply evaded.

scholarly journals Probing the explanation of the muon (g-2) anomaly and thermal light dark matter with the semi-visible dark photon channel

2021 ◽  
Vol 81 (10) ◽  
Author(s):  
C. Cazzaniga ◽  
P. Odagiu ◽  
E. Depero ◽  
L. Molina Bueno ◽  
Yu. M. Andreev ◽  
...  
Keyword(s):  
Dark Matter ◽  
Detection Efficiency ◽  
Vector Boson ◽  
Large Mass ◽  
New Physics ◽  
Mass Splitting ◽  
Dark Photon ◽  
Dark Matter Relic Density ◽  
Relic Abundance ◽  
Pseudo Scalar

AbstractWe report the results of a search for a new vector boson ($$ A'$$ A ′ ) decaying into two dark matter particles $$\chi _1 \chi _2$$ χ 1 χ 2 of different mass. The heavier $$\chi _2$$ χ 2 particle subsequently decays to $$\chi _1$$ χ 1 and an off-shell Dark Photon $$ A'^* \rightarrow e^+e^-$$ A ′ ∗ → e + e - . For a sufficiently large mass splitting, this model can explain in terms of new physics the recently confirmed discrepancy observed in the muon anomalous magnetic moment at Fermilab. Remarkably, it also predicts the observed yield of thermal dark matter relic abundance. A detailed Monte-Carlo simulation was used to determine the signal yield and detection efficiency for this channel in the NA64 setup. The results were obtained re-analyzing the previous NA64 searches for an invisible decay $$A'\rightarrow \chi \overline{\chi }$$ A ′ → χ χ ¯ and axion-like or pseudo-scalar particles $$a \rightarrow \gamma \gamma $$ a → γ γ . With this method, we exclude a significant portion of the parameter space justifying the muon g-2 anomaly and being compatible with the observed dark matter relic density for $$A'$$ A ′ masses from 2$$m_e$$ m e up to 390 MeV and mixing parameter $$\varepsilon $$ ε between $$3\times 10^{-5}$$ 3 × 10 - 5 and $$2\times 10^{-2}$$ 2 × 10 - 2 .

scholarly journals Light(ly)-coupled dark matter in the keV range: freeze-in and constraints

2021 ◽  
Vol 2021 (3) ◽  
Author(s):  
Jae Hyeok Chang ◽  
Rouven Essig ◽  
Annika Reinert
Keyword(s):  
Dark Matter ◽  
Dipole Moment ◽  
Magnetic Dipole ◽  
Magnetic Dipole Moment ◽  
Direct Detection ◽  
Gauge Coupling ◽  
Dark Photon ◽  
Red Giant ◽  
Bremsstrahlung Process ◽  
Relic Abundance

Abstract Dark matter produced from thermal freeze-out is typically restricted to have masses above roughly 1 MeV. However, if the couplings are small, the freeze-in mechanism allows for production of dark matter down to keV masses. We consider dark matter coupled to a dark photon that mixes with the photon and dark matter coupled to photons through an electric or magnetic dipole moment. We discuss contributions to the freeze-in production of such dark matter particles from standard model fermion-antifermion annihilation and plasmon decay. We also derive constraints on such dark matter from the cooling of red giant stars and horizontal branch stars, carefully evaluating the thermal processes as well as the bremsstrahlung process that dominates for masses above the plasma frequency. We find that the parameters needed to obtain the observed relic abundance from freeze-in are excluded below a few tens of keV, depending on the value of the dark gauge coupling constant for the dark photon portal model, and below a few keV, depending on the reheating temperature for dark matter with an electric or magnetic dipole moment. While laboratory probes are unlikely to probe these freeze-in scenarios in general, we show that for dark matter with an electric or magnetic dipole moment and for dark matter masses above the reheating temperature, the couplings needed for freeze-in to produce the observed relic abundance can be probed partially by upcoming direct-detection experiments.

Sign in / Sign up

Export Citation Format

Share Document