scholarly journals Radiative bound-state formation in unbroken perturbative non-Abelian theories and implications for dark matter

2018 ◽  
Vol 2018 (7) ◽  
Author(s):  
Julia Harz ◽  
Kalliopi Petraki
Keyword(s):  
Dark Matter ◽  
State Formation ◽  
Bound State

scholarly journals Rapid Bound State Formation of Dark Matter in the Early Universe

2020 ◽  
Vol 124 (16) ◽  
Author(s):  
Tobias Binder ◽  
Kyohei Mukaida ◽  
Kalliopi Petraki
Keyword(s):  
Dark Matter ◽  
Early Universe ◽  
State Formation ◽  
Bound State

scholarly journals Indirect searches for dark matter bound state formation and level transitions

2020 ◽  
Vol 9 (5) ◽  
Author(s):  
Iason Baldes ◽  
Francesca Calore ◽  
Kalliopi Petraki ◽  
Vincent Poireau ◽  
Nicholas L. Rodd
Keyword(s):  
Dark Matter ◽  
State Formation ◽  
Bound States ◽  
Bound State ◽  
Photon Mass ◽  
Dark Photon ◽  
Dissipation Of Energy ◽  
Light Force

Indirect searches for dark matter (DM) have conventionally been applied to the products of DM annihilation or decay. If DM couples to light force carriers, however, it can be captured into bound states via dissipation of energy that may yield detectable signals. We extend the indirect searches to DM bound state formation and transitions between bound levels, and constrain the emission of unstable dark photons. Our results significantly refine the predicted signal flux that could be observed in experiments. As a concrete example, we use Fermi-LAT dwarf spheroidal observations to obtain constraints in terms of the dark photon mass and energy which we use to search for the formation of stable or unstable bound states.

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 Bound-state formation for thermal relic dark matter and unitarity

2014 ◽  
Vol 2014 (12) ◽  
pp. 033-033 ◽  
Author(s):  
Benedict von Harling ◽  
Kalliopi Petraki
Keyword(s):  
Dark Matter ◽  
State Formation ◽  
Bound State

scholarly journals Dark matter bound-state formation at higher order: a non-equilibrium quantum field theory approach

2020 ◽  
Vol 2020 (9) ◽  
Author(s):  
Tobias Binder ◽  
Burkhard Blobel ◽  
Julia Harz ◽  
Kyohei Mukaida
Keyword(s):  
Field Theory ◽  
Quantum Field Theory ◽  
Dark Matter ◽  
State Formation ◽  
Bound State ◽  
Higher Order ◽  
Theory Approach ◽  
Quantum Field ◽  
The Impact ◽  
Non Equilibrium

Abstract The formation of meta-stable dark matter bound states in coannihilating scenarios could efficiently occur through the scattering with a variety of Standard Model bath particles, where light bosons during the electroweak cross over or even massless photons and gluons are exchanged in the t-channel. The amplitudes for those higher-order processes, however, are divergent in the collinear direction of the in- and out-going bath particles if the mediator is massless. To address the issue of collinear divergences, we derive the bound-state formation collision term in the framework of non-equilibrium quantum field theory. The main result is an expression for a more general cross section, which allows to compute higher-order bound-state formation processes inside the primordial plasma background in a comprehensive manner. Based on this result, we show that next-to-leading order contributions, including the bath-particle scattering, are i) collinear finite and ii) generically dominate over the on-shell emission for temperatures larger than the absolute value of the binding energy. Based on a simplified model, we demonstrate that the impact of these new effects on the thermal relic abundance is significant enough to make it worthwhile to study more realistic coannihilation scenarios.

scholarly journals Detecting dark photons from atomic rearrangement in the galaxy

2021 ◽  
Vol 2021 (4) ◽  
Author(s):  
James Eiger ◽  
Michael Geller
Keyword(s):  
Dark Matter ◽  
Ground State ◽  
Bound State ◽  
Current Data ◽  
Dark Sector ◽  
Atomic Process ◽  
The Galaxy ◽  
Atomic States ◽  
Atomic Rearrangement

Abstract We study a new dark sector signature for an atomic process of “rearrangement” in the galaxy. In this process, a hydrogen-like atomic dark matter state together with its anti-particle can rearrange to form a highly-excited bound state. This bound state will then de-excite into the ground state emitting a large number of dark photons that can be measured in experiments on Earth through their kinetic mixing with the photon. We find that for DM masses in the GeV range, the dark photons have enough energy to pass the thresholds of neutrino observatories such as Borexino and Super-Kamiokande that can probe for our scenario even when our atomic states constitute a small fraction of the total DM abundance. We study the corresponding bounds on the parameters of our model from current data as well as the prospects for future detectors.

Virtual-Bound-State Formation in Pd-U Alloys

1970 ◽  
Vol 2 (11) ◽  
pp. 4590-4596 ◽  
Author(s):  
W. J. Nellis ◽  
M. B. Brodsky ◽  
H. Montgomery ◽  
G. P. Pells
Keyword(s):  
State Formation ◽  
Bound State

Effective potential, instabilities and bound-state formation

1975 ◽  
Vol 29 (4) ◽  
pp. 504-508 ◽  
Author(s):  
W. Fischler ◽  
E. Gunzig ◽  
R. Brout
Keyword(s):  
State Formation ◽  
Effective Potential ◽  
Bound State
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