Lepton number violation in theories with a large number of standard model copies

Kovalenko, Sergey; Päs, Heinrich; Schmidt, Iván

doi:10.1103/physrevd.83.051901

Cited by 2 publications

(1 citation statement)

References 13 publications

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“…Before proceeding, we cite some other implications of this framework studied in Refs. [12][13][14][15][16][17][18][19][20][21]. We also note that a possible solution with less number of copies was discussed in Ref.…”

Section: Introductionmentioning

confidence: 99%

Compact dark matter objects via N dark sectors

2020

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We propose a novel class of compact dark matter objects in theories where the dark matter consists of multiple sectors. We call these objects N -MACHOs. In such theories neither the existence of dark matter species nor their extremely weak coupling to the observable sector represent additional hypotheses but instead are imposed by the solution to the Hierarchy Problem and unitarity. The crucial point is that particles from the same sector have non-trivial interactions but interact only gravitationally otherwise. As a consequence, the pressure that counteracts the gravitational collapse is reduced while the gravitational force remains the same. This results in collapsed structures much lighter and smaller as compared to the ordinary single-sector case. We apply this phenomenon to a dark matter theory that consists of N dilute copies of the Standard Model. The solutions do not rely on an exotic stabilization mechanism, but rather use the same well-understood properties as known stellar structures. This framework also gives rise to new microscopic superheavy structures, for example with mass 10 8 g and size 10 −13 cm. By confronting the resulting objects with observational constraints, we find that, due to a huge suppression factor entering the mass spectrum, these objects evade the strongest constrained region of the parameter space. Finally, we discuss possible formation scenarios of N -MACHOs. We argue that, due to the efficient dissipation of energy on small scales, high-density regions such as ultra-compact mini-halos could serve as formation sites of N -MACHOs. * Electronic address: emi@mpp.mpg.de 1 An example of the theory that obeys such a standard is that of the axion [1,2], which is motivated by the Peccei-Quinn solu-arXiv:1911.13281v1 [astro-ph.CO]

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Section: Introductionmentioning

confidence: 99%

Compact dark matter objects via N dark sectors

2020

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Neutrino-Less Double Beta Decay and Particle Physics

Rodejohann

2011

Int. J. Mod. Phys. E

533

529

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We review the particle physics aspects of neutrino-less double beta decay. This process can be mediated by light massive Majorana neutrinos (standard interpretation) or by something else (non-standard interpretations). The physics potential of both interpretations is summarized and the consequences of future measurements or improved limits on the half-life of neutrino-less double beta decay are discussed. We try to cover all proposed alternative realizations of the decay, including light sterile neutrinos, supersymmetric or left-right symmetric theories, Majorons, and other exotic possibilities. Ways to distinguish the mechanisms from one another are discussed. Experimental and nuclear physics aspects are also briefly touched, alternative processes to double beta decay are discussed, and an extensive list of references is provided.

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Lepton number violation in theories with a large number of standard model copies

Cited by 2 publications

References 13 publications

Compact dark matter objects via N dark sectors

Compact dark matter objects via N dark sectors

Neutrino-Less Double Beta Decay and Particle Physics

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