22,147 research outputs found
Dark Matter Induced Nucleon Decay: Model and Signatures
If dark matter (DM) carries anti-baryon number, a DM particle may annihilate
with a nucleon by flipping to anti-DM. Inspired by Hylogenesis models, we
introduce a single component DM model where DM is asymmetric and carries B and
L as -1/2. It can annihilate with a nucleon to an anti-lepton and an anti-DM at
leading order or with an additional meson at sub-leading order. Such signals
may be observed in proton decay experiments. If DM is captured in the Sun, the
DM induced nucleon decay can generate a large flux of anti-neutrinos, which
could be observed in neutrino experiments. Furthermore, the anti-DM particle in
the final state obtains a relatively large momentum (few hundred MeV), and
escapes the Sun. These fast-moving anti-DM particles could also induce
interesting signals in various underground experiments.Comment: Discussion about (g-2) is added. References are updated. Introduction
is expanded. Accepted by JHE
Dark Energy and Normalization of the Cosmological Wave Function
Dark energy is investigated from the perspective of quantum cosmology. It is
found that, together with an appropriate normal ordering factor , only when
there is dark energy then can the cosmological wave function be normalized.
This interesting observation may require further attention.Comment: Title changed, match the published versio
A note on the resolution of the entropy discrepancy
It was found by Hung, Myers and Smolkin that there is entropy discrepancy for
the CFTs in 6-dimensional space-time, between the field theoretical and the
holographic analysis. Recently, two different resolutions to this puzzle have
been proposed. One of them suggests to utilize the anomaly-like entropy and the
generalized Wald entropy to resolve the HMS puzzle, while the other one
initiates to use the entanglement entropy which arises from total derivative
terms in the Weyl anomaly to explain the HMS mismatch. We investigate these two
proposals carefully in this note. By studying the CFTs dual to Einstein
gravity, we find that the second proposal can not solve the HMS puzzle.
Moreover, the Wald entropy formula is not well-defined on horizon with
extrinsic curvatures, in the sense that, in general, it gives different results
for equivalent actions.Comment: 12 pages, no figures, accepted by PL
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