Dark atoms and puzzles of dark matter searches

Khlopov, Maxim Yu.

doi:10.1142/s0217751x14430027

Cited by 39 publications

(13 citation statements)

References 127 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[27], the unitarity argument can be also applied to the annihilation of extended composite objects, such as DM atoms, see for example Refs. [79,80]. These particles can be seen as WIMPs in the wider sense since they are massive, have initial thermal equilibrium with the SM plasma and a cross section, weak enough such that a significant relic abundance survives asymptotically.…”

Section: Unitarity Bounds For Extended Objectsmentioning

confidence: 99%

Tev-scale thermal WIMPs: Unitarity and its consequences

Smirnov

Beacom

2019

Phys. Rev. D

View full text Add to dashboard Cite

We re-examine unitarity bounds on the annihilation cross section of thermal-WIMP dark matter. For high-mass pointlike dark matter, it is generic to form WIMP bound states, which, together with Sommerfeld enhancement, affects the relic abundance. We show that these effects lower the unitarity bound from 139 TeV to below 100 TeV for non-self-conjugate dark matter and from 195 TeV (the oft-quoted value of 340 TeV assumes ΩDM h 2 = 1) to 140 TeV for the self-conjugate case. For composite dark matter, for which the unitarity limit on the radius was thought to be mass-independent, we show that the largest allowed mass is 1 PeV. In addition, we find important new effects for annihilation in the late universe. For example, while the production of high-energy light fermions in WIMP annihilation is suppressed by helicity, we show that bound-state formation changes this. Coupled with rapidly improving experimental sensitivity to TeV-range gamma rays, cosmic rays, and neutrinos, our results give new hope to attack the thermal-WIMP mass range from the high-mass end.

show abstract

Section: Unitarity Bounds For Extended Objectsmentioning

confidence: 99%

Tev-scale thermal WIMPs: Unitarity and its consequences

Smirnov

Beacom

2019

Phys. Rev. D

View full text Add to dashboard Cite

show abstract

“…These reasons highlight the importance of exploring the full landscape of possible interactions. Some examples of the studied possibilities include inelastic transitions [4], dark matter form factors [5,6], dark matter-nucleus resonances [7,8], and isospin-violating dark matter [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

A model independent approach to inelastic dark matter scattering

2014

View full text Add to dashboard Cite

We present a model independent analysis of inelastic dark matter transitions at direct detection experiments by modifying the elastic methodology of Fitzpatrick, et al. By analyzing the kinematics of inelastic transitions, we find the relevant variables to describe these scattering processes, the primary change being a modification of the v ⊥ variable. Taking this into account, we list the relevant scattering matrix elements and modify the Mathematica package of Anand, et al. to calculate the necessary form factors. As an application, we determine the matrix elements of inelastic scattering for spin transitions between a fermion to fermion, scalar to vector, and scalar to scalar. Finally, we consider fits to the DAMA/LIBRA annual modulation signal for the magnetic inelastic dark matter scenario as well as a model independent scan over relativistic operators, constraining them with limits from direct detection experiments. In the magnetic inelastic dark matter scenario or if the dark matter couples through relativistic operators involving only protons, we find that experiments with xenon and germanium targets can have consistently small rates. However, limits from iodine experiments are much more constraining, leaving small regions of allowed parameter space. We point out that existing uncertainties in the iodine quenching factor strongly affects the constraints, motivating further study to pin down the correct values.

show abstract

“…Several ideas have been put forward that can be broadly classified according to whether dark matter emerges as an elementary particle or a composite one made up of more fundamental matter. Both possibilities have been explored in the literature [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Thermal history of composite dark matter

2020

View full text Add to dashboard Cite

We study the thermodynamic history of composite dark matter models. We start with classifying the models by means of the symmetries partially protecting the composite dark matter decays and constrain their lifetimes. For each model, we determine the impact of number-changing and number-conserving operators on its thermal history. We also develop the analytic formalism to calculate the asymptotic abundance of stable relics. We show how the relative strength between number-changing and numberconserving interactions together with the dark plasma lifetime affect the thermal fate of the various composite models. Additionally, we show that the final dark relic density of composite particles can be diluted due to an entropy increase stemming from dark plasma decay. Finally, we confront the models with experimental bounds. We find that indirect detection experiments are most promising in testing this large class of models.

show abstract

Dark atoms and puzzles of dark matter searches

Cited by 39 publications

References 127 publications

Tev-scale thermal WIMPs: Unitarity and its consequences

Tev-scale thermal WIMPs: Unitarity and its consequences

A model independent approach to inelastic dark matter scattering

Thermal history of composite dark matter

Contact Info

Product

Resources

About