Recursive computation of steady state probabilities in M/M/1/B queues

Ahmed, Rana Ejaz

doi:10.1109/icecta.2017.8251988

Cited by 3 publications

(5 citation statements)

References 5 publications

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“…From the figure, we see that for the viable models M 1 /M 2 goes from (0.9, 1.1) at low M Z to (0.6, 1.6) for M Z ∼ 5 TeV and then it narrows down again, reaching about The parameter tan β does not directly affect the DM relic density -see Eq. (22). It can modify the viable parameter space, however, via the perturbativity and vacuum stability conditions.…”

Section: The Viable Parameter Spacementioning

confidence: 99%

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Two-component dark matter and a massless neutrino in a new B−L model

et al. 2019

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We propose a new extension of the Standard Model by a U (1) B−L gauge symmetry in which the anomalies are canceled by two right-handed neutrinos plus four chiral fermions with fractional B − L charges. Two scalar fields that break the B − L symmetry and give masses to the new fermions are also required. After symmetry breaking, two neutrinos acquire Majorana masses via the seesaw mechanism leaving a massless neutrino in the spectrum. Additionally, the other new fermions arrange themselves into two Dirac particles, both of which are automatically stable and contribute to the observed dark matter density. This model thus realizes in a natural way, without ad hoc discrete symmetries, a two-component dark matter scenario. We analyze in some detail the dark matter phenomenology of this model. The dependence of the relic densities with the parameters of the model is illustrated and the regions consistent with the observed dark matter abundance are identified. Finally, we impose the current limits from LHC and direct detection experiments, and show that the high mass region of this model remains unconstrained.

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Section: The Viable Parameter Spacementioning

confidence: 99%

“…Refs. [18][19][20][21][22]) in a natural way, without any discrete symmetry. In the scalar sector, the model contains only two additional scalar fields that break the B − L symmetry and give masses to the new fermions.…”

Section: Introductionmentioning

confidence: 99%

Two-component dark matter and a massless neutrino in a new B−L model

et al. 2019

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“…(45) are coupled and must be solved numerically to find the freeze-out of the individual components. However, as it is shown in [60], for interacting multicomponent DM scenario [61,62], annihilation of heavier components to lighter ones are crucial in determining the relics of only heavier components, while for lighter components it has mild effect. Hence we can derive an approximate analytic expressions for the individual relic densities by considering the annihilation of one pNGB kind to the lighter species.…”

Section: Non-degenerate Pnbgsmentioning

confidence: 95%

Dark matter as a remnant of SQCD inflation

Bhattacharya

Saha

Sil

et al. 2018

J. High Energ. Phys.

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We propose a strongly coupled supersymmetric gauge theory that can accommodate both the inflation (in the form of generalized hybrid inflation) and dark matter (DM).In this set-up, we identify the DM as the Goldstones associated with the breaking of a global symmetry (SU (4) × SU (4) → SU (4)) after inflation ends. Due to the non-abelian nature of this symmetry, the scenario provides with multiple DMs. We then construct a low energy theory which generates a Higgs portal like coupling of the DMs with Standard Model (SM), thus allowing them to thermally freeze out. While the scales involved in the inflation either have a dynamical origin or related to UV interpretation in terms of a heavy quark field in the supersymmetric QCD (SQCD) sector, the DM masses however are generated from explicit breaking of the chiral symmetry of the SQCD sector. We discuss DM phenomenology for both degenerate and non-degenerate cases, poised with DM-DM interactions and find allowed region of parameter space in terms of relic density and direct search constraints. IntroductionAmidst the great success of the Standard Model (SM) of particle physics, there are several intriguing issues which indicate that the SM should be extended or supplemented by some other sector (including new fields and/or gauge symmetry) in order to provide a more complete description of nature. In particular, SM fails to accommodate a large share of energy density of the universe (25%), called dark matter (DM). On the other hand, the idea of primordial inflation serves as an elegant construction which can actually resolve some of the intricate problems (e.g horizon and flatness problems) of otherwise quite successful Big Bang cosmology. This inflationary hypothesis is further strengthened by its prediction on the primordial perturbation that leads to striking agreements with the observation of the cosmic microwave background radiation (CMBR) spectrum. However, SM alone can not be responsible for such 1 subhaditya@iitg.ac.in 2 abhijit.saha@iitg.ac.in 3 asil@iitg.ac.in

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“…For Z ′ decay, the channel Z ′ → as is dominant, and the decay width is given by the second term of Eq. (16). Then s subsequently decays via s → ae + e − , and gamma-rays are produced by Bremsstrahlung process and thus a constraint is imposed on the model [62].…”

Section: Cosmic-ray Cmb and Bbn Observationsmentioning

confidence: 99%

“…However there is no strong motivation to consider only one component dark matter. In fact, multi-component dark matter naturally appears and is phenomenologically motivated in some cases [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17], and some interesting consequences are expected such as double disk galaxy structure constructed by normal matter and dark matter [18,19], multiple gamma-ray line signals and boosted dark matter signals [20][21][22][23][24][25][26] and so on.…”

Section: Introductionmentioning

confidence: 99%

Boosted self-interacting dark matter in a multi-component dark matter model

Aoki

Toma

2018

J. Cosmol. Astropart. Phys.

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In models of multi-component dark matter, the lighter component of dark matter can be boosted by annihilations of the heavier state if mass splitting is large enough. Such relativistic dark matter can be detectable via large neutrino detectors such as Super-Kamiokande and IceCube. Moreover, if the process is inelastic scattering and decay length of the produced particle is short enough, another signature coming from the decay can also be detectable. In this paper, we construct a simple twocomponent dark matter model with a hidden U (1) D gauge symmetry where the lighter component of dark matter has a potential to improve the so-called small scale structure problems with large self-interacting cross section. We estimate number of multi-Cherenkov ring events due to both of the boosted dark matter and subsequent decay of the particle produced by inelastic scattering at Hyper-Kamiokande future experiment. Some relevant constraints, such as dark matter direct detection and cosmological observations, are also taken into account. The numerical analysis shows that some parameter space which can induce large self-interacting cross section can give a few multi-Cherenkov ring events per year at Hyper-Kamiokande.

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Recursive computation of steady state probabilities in M/M/1/B queues

Cited by 3 publications

References 5 publications

Two-component dark matter and a massless neutrino in a new B−L model

Two-component dark matter and a massless neutrino in a new B−L model

Dark matter as a remnant of SQCD inflation

Boosted self-interacting dark matter in a multi-component dark matter model

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