scholarly journals The Echo Method for Axion Dark Matter Detection

Symmetry ◽  
2021 ◽  
Vol 13 (11) ◽  
pp. 2150
Author(s):  
Ariel Arza ◽  
Elisa Todarello
Keyword(s):  
Dark Matter ◽  
Angular Frequency ◽  
Spontaneous Breaking ◽  
Dark Matter Candidate ◽  
Echo Signal ◽  
Axion Mass ◽  
Analytical Formulas ◽  
Near Future ◽  
Axion Decay ◽  
Matter Detection

The axion is a dark matter candidate arising from the spontaneous breaking of the Peccei–Quinn symmetry, introduced to solve the strong CP problem. It has been shown that radio/microwave radiation sent out to space is backscattered in the presence of axion dark matter due to stimulated axion decay. This backscattering is a feeble and narrow echo signal centered at an angular frequency very close to one-half of the axion mass. In this article, we summarize all the relevant results found so far, including analytical formulas for the echo signal, as well as sensitivity prospects for possible near-future experiments.

scholarly journals Long-lived dark Higgs and inelastic dark matter at Belle II

2021 ◽  
Vol 2021 (4) ◽  
Author(s):  
Michael Duerr ◽  
Torben Ferber ◽  
Camilo Garcia-Cely ◽  
Christopher Hearty ◽  
Kai Schmidt-Hoberg
Keyword(s):  
Dark Matter ◽  
Higgs Field ◽  
Mass Splitting ◽  
Dark Sector ◽  
Missing Momentum ◽  
Belle Ii ◽  
Displaced Vertex ◽  
Inelastic Dark Matter ◽  
Near Future ◽  
Matter Detection

Abstract Inelastic dark matter is an interesting scenario for light thermal dark matter which is fully consistent with all cosmological probes as well as direct and indirect dark matter detection. The required mass splitting between dark matter χ1 and its heavier twin χ2 is naturally induced by a dark Higgs field which also provides a simple mechanism to give mass to the dark photon A′ present in the setup. The corresponding dark Higgs boson h′ is naturally the lightest dark sector state and therefore decays into Standard Model particles via Higgs mixing. In this work we study signatures with displaced vertices and missing momentum at Belle II, arising from dark Higgs particles produced in association with dark matter. We find that Belle II can be very sensitive to this scenario, in particular if a displaced vertex trigger is available in the near future.

scholarly journals Gravitational production of a conformal dark sector

2021 ◽  
Vol 2021 (5) ◽  
Author(s):  
Michele Redi ◽  
Andrea Tesi ◽  
Hannah Tillim
Keyword(s):  
Dark Matter ◽  
Central Charge ◽  
Equilibrium Phase ◽  
Dark Matter Candidate ◽  
Dark Sector ◽  
Scale Invariant ◽  
Strongly Coupled ◽  
Holographic Duals ◽  
Relativistic Regime ◽  
Analytical Formulas

Abstract Dark sectors with purely gravitational couplings to the Standard Model are unavoidably populated from the SM plasma by graviton exchange, and naturally provide dark matter candidates. We examine the production in the relativistic regime where the dark sector is approximately scale invariant, providing general analytical formulas that depend solely on the central charge of the dark sector. We then assess the relevance of interactions that can lead to a variety of phenomena including thermalisation, non-perturbative mass gaps, out-of-equilibrium phase transitions and cannibalism in the dark sector. As an illustrative example we consider the dark glueball scenario in this light and show it to be a viable dark matter candidate due to the suppression of gravitational production. We go on to extend these results to strongly coupled CFTs and their holographic duals at large-N with the dark dilaton as the dark matter candidate.

scholarly journals The radion as a dark matter candidate

2018 ◽  
Vol 33 (24) ◽  
pp. 1850144
Author(s):  
Fayez Abu-Ajamieh
Keyword(s):  
Dark Matter ◽  
Scale Invariance ◽  
Spontaneous Breaking ◽  
Newtonian Gravity ◽  
Dark Matter Candidate ◽  
The Future ◽  
Scale Breaking ◽  
Age Of The Universe ◽  
Relic Abundance ◽  
The Universe

I study a class of Randall–Sundrum (RS) models with Spontaneous Breaking of Scale Invariance (SBSI). This class of models implements the Contino–Pomarol–Rattazzi (CPR) mechanism to achieve SBSI through the small running of an external close-to-marginal scale-breaking operator that leads to a light dilaton/radion with couplings to matter suppressed by the small running. I show that for radion masses [Formula: see text] KeV, it can serve as a dark matter (DM) candidate, with a lifetime longer than the age of the universe, and show that the experimental bounds from LHC, non-Newtonian gravity and Axion-Like Particle (ALP) searches allow for the existence of such a radion. In spite of the small relic abundance of the light radion produced in this model, we show that it could be possible to obtain the required abundance through additional assumptions, an issue we postpone to the future.

scholarly journals DIRECT DETECTION OF SUPERSYMMETRIC DARK MATTER: THEORETICAL RATES FOR TRANSITIONS TO EXCITED STATES

2005 ◽  
Vol 14 (05) ◽  
pp. 751-762 ◽  
Author(s):  
J. D. VERGADOS ◽  
P. QUENTIN ◽  
D. STROTTMAN
Keyword(s):  
Dark Matter ◽  
Excited State ◽  
Excited States ◽  
Particle Physics ◽  
Gamma Ray ◽  
Direct Detection ◽  
Supersymmetric Particle ◽  
Dark Matter Candidate ◽  
Matter Detection ◽  
Direct Dark Matter

The recent WMAP data have confirmed that exotic dark matter together with the vacuum energy (cosmological constant) dominate in the flat universe. Supersymmetry provides a natural dark matter candidate, the lightest supersymmetric particle (LSP). Thus direct dark matter detection is central to particle physics and cosmology. Most of the research on this issue has hitherto focused on the detection of the recoiling nucleus. In this paper, we study transitions to the excited states, focusing on the first excited state at 50 keV of Iodine A=127. We find that the transition rate to this excited state is ≼10 percent of the transition to the ground state. So, in principle, the extra signature of the gamma ray following its de-excitation can be exploited experimentally.

scholarly journals The Search for Electroweakinos

2020 ◽  
Vol 70 (1) ◽  
pp. 425-454
Author(s):  
Anadi Canepa ◽  
Tao Han ◽  
Xing Wang
Keyword(s):  
Dark Matter ◽  
Cold Dark Matter ◽  
Direct Detection ◽  
Hadron Collider ◽  
Massive Particle ◽  
Model Parameters ◽  
Dark Matter Candidate ◽  
Singlet States ◽  
Supersymmetric Theories ◽  
Near Future

In this review, we consider a general theoretical framework for fermionic color-singlet states—including a singlet, a doublet, and a triplet under the Standard Model SU(2)L gauge symmetry, corresponding to the bino, higgsino, and wino in supersymmetric theories—generically dubbed electroweakinos for their mass eigenstates. Depending on the relations among these states’ three mass parameters and their mixing after the electroweak symmetry breaking, this sector leads to a rich phenomenology that may be accessible in current and near-future experiments. We discuss the decay patterns of electroweakinos and their observable signatures at colliders, review the existing bounds on the model parameters, and summarize the current statuses of the comprehensive searches by the ATLAS and CMS Collaborations at the Large Hadron Collider. We also comment on the prospects for future colliders. An important feature of the theory is that the lightest neutral electroweakino can be identified as a weakly interacting massive particle cold dark matter candidate. We take into account the existing bounds on the parameters from the dark matter direct detection experiments and discuss the complementarity of the electroweakino searches at colliders.

scholarly journals Maximal axion misalignment from a minimal model

2020 ◽  
Vol 2020 (10) ◽  
Author(s):  
Junwu Huang ◽  
Amalia Madden ◽  
Davide Racco ◽  
Mario Reig
Keyword(s):  
Phase Transition ◽  
Dark Matter ◽  
Decay Constant ◽  
Axion Mass ◽  
Qcd Phase Transition ◽  
Axion Field ◽  
Axion Decay Constant ◽  
Axion Decay ◽  
The Universe ◽  
Simple Dynamical Model

Abstract The QCD axion is one of the best motivated dark matter candidates. The misalignment mechanism is well known to produce an abundance of the QCD axion consistent with dark matter for an axion decay constant of order 1012 GeV. For a smaller decay constant, the QCD axion, with Peccei-Quinn symmetry broken during inflation, makes up only a fraction of dark matter unless the axion field starts oscillating very close to the top of its potential, in a scenario called “large-misalignment”. In this scenario, QCD axion dark matter with a small axion decay constant is partially comprised of very dense structures. We present a simple dynamical model realising the large-misalignment mechanism. During inflation, the axion classically rolls down its potential approaching its minimum. After inflation, the Universe reheats to a high temperature and a modulus (real scalar field) changes the sign of its minimum dynamically, which changes the sign of the mass of a vector-like fermion charged under QCD. As a result, the minimum of the axion potential during inflation becomes the maximum of the potential after the Universe has cooled through the QCD phase transition and the axion starts oscillating. In this model, we can produce QCD axion dark matter with a decay constant as low as 6 × 109 GeV and an axion mass up to 1 meV. We also summarise the phenomenological implications of this mechanism for dark matter experiments and colliders.

scholarly journals Hidden photon and axion dark matter from symmetry breaking

2021 ◽  
Vol 2021 (10) ◽  
Author(s):  
Kazunori Nakayama ◽  
Wen Yin
Keyword(s):  
Phase Transition ◽  
Dark Matter ◽  
Symmetry Breaking ◽  
Order Phase Transition ◽  
Spontaneous Breaking ◽  
Dark Matter Candidate ◽  
Goldstone Bosons ◽  
Hidden Symmetry ◽  
First Order Phase Transition ◽  
First Order Phase

Abstract A light hidden photon or axion-like particle is a good dark matter candidate and they are often associated with the spontaneous breaking of dark global or gauged U(1) symmetry. We consider the dark Higgs dynamics around the phase transition in detail taking account of the portal coupling between the dark Higgs and the Standard Model Higgs as well as various thermal effects. We show that the (would-be) Nambu-Goldstone bosons are efficiently produced via a parametric resonance with the resonance parameter q ∼ 1 at the hidden symmetry breaking. In the simplest setup, which predicts a second order phase transition, this can explain the dark matter abundance for the axion or hidden photon as light as sub eV. Even lighter mass, as predicted by the QCD axion model, can be consistent with dark matter abundance in the case of first order phase transition, in which case the gravitational wave signals may be detectable by future experiments such as LISA and DECIGO.

scholarly journals A connection between flavour anomaly, neutrino mass, and axion

2020 ◽  
Vol 2020 (10) ◽  
Author(s):  
Seungwon Baek
Keyword(s):  
Dark Matter ◽  
Cold Dark Matter ◽  
Goldstone Boson ◽  
Mass Term ◽  
Higgs Doublet ◽  
New Physics ◽  
Fine Tuning ◽  
Spontaneous Breaking ◽  
Tree Level ◽  
Dark Matter Candidate

Abstract We propose a minimal model in which the flavour anomaly in the b → sμ+μ− transition is connected to the breaking of Peccei-Quinn (PQ) symmetry. The flavour anomaly is explained from new physics contribution by introducing one generation of heavy quark and heavy lepton which are vector-like under the standard model (SM) gauge group but charged under a local U(1)X group. They mix with the SM quarks and leptons, inducing flavour-changing Z′ couplings, which generates the b → sμ+μ− anomaly at tree level. On the other hand the new fermions are chiral under the global Peccei-Quinn(PQ) symmetry. The pseudo-Goldstone boson coming from the spontaneous breaking of the PQ symmetry becomes an axion, solving the strong CP problem and providing a cold dark matter candidate. The same symmetry prevents the right-handed neutrino from having a Majorana mass term. But the introduction of a neutrino-specific Higgs doublet allows neutrino to have Dirac mass term without fine-tuning problem. The model shows an interplay between axion, neutrino, dark matter, and flavour physics.

scholarly journals Strong CP problem and axion dark matter with small instantons

2021 ◽  
Vol 2021 (7) ◽  
Author(s):  
Ryuichiro Kitano ◽  
Wen Yin
Keyword(s):  
Dark Matter ◽  
Decay Constant ◽  
Strongly Coupled ◽  
Axion Mass ◽  
High Energies ◽  
Mass Correction ◽  
Large Correction ◽  
Axion Decay Constant ◽  
Axion Decay ◽  
The Universe

Abstract The axion mass receives a large correction from small instantons if the QCD gets strongly coupled at high energies. We discuss the size of the new CP violating phases caused by the fact that the small instantons are sensitive to the UV physics. We also discuss the effects of the mass correction on the axion abundance of the Universe. Taking the small-instanton contributions into account, we propose a natural scenario of axion dark matter where the axion decay constant is as large as 1015-16 GeV. The scenario works in the high-scale inflation models.

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