Cosmological signatures of superheavy dark matter
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Springer
Received: February 24, Revised: June 27, Accepted: July 8, Published: July 30,
2020 2020 2020 2020
Lingfeng Li,a,b Shiyun Lu,a,b Yi Wanga,b and Siyi Zhouc a
Department of Physics, Hong Kong University of Science and Technology, Hong Kong, P.R. China b HKUST Jockey Club Institute for Advanced Study, Hong Kong University of Science and Technology, Hong Kong, P.R. China c The Oskar Klein Centre for Cosmoparticle Physics & Department of Physics, Stockholm University, AlbaNova, 106 91 Stockholm, Sweden
E-mail: [email protected], [email protected], [email protected], [email protected] Abstract: We discuss two possible scenarios, namely the curvaton mechanism and the dark matter density modulation, where non-Gaussianity signals of superheavy dark matter produced by gravity can be enhanced and observed. In both scenarios, superheavy dark matter couples to an additional light field as a mediator. In the case of derivative coupling, the resulting non-Gaussianities induced by the light field can be large, which can provide inflationary evidences for these superheavy dark matter scenarios. Keywords: Cosmology of Theories beyond the SM, Beyond Standard Model ArXiv ePrint: 2002.01131
c The Authors. Open Access, Article funded by SCOAP3 .
https://doi.org/10.1007/JHEP07(2020)231
JHEP07(2020)231
Cosmological signatures of superheavy dark matter
Contents 1
2 Model
2
3 Superheavy DM gravitational production during inflation
4
4 Isocurvature fluctuations during inflation 4.1 Bispectrum 4.2 Trispectrum
7 7 9
5 Curvaton scenario: NG introduced by light field decay 5.1 NG signals 5.2 Observational constraints
10 12 14
6 DM modulation scenario: NG introduced by DM production
16
7 Conclusion and outlook
18
A Details of the computation of the loop diagram
19
1
Introduction
The nature of dark matter (DM) is a frontier in the modern cosmology. There have been plenty of astronomical and cosmological evidences for DM, such as the galaxy rotation curve, virial velocities of galaxy clusters, gravitational lensing, bullet clusters, supernovae, cosmic microwave background, existence of galaxies in lifetime of the universe and existence of galaxies on scale of milky way. The production mechanism of the dark matter is not known so far. It can be produced during inflation or subsequent cosmological evolutions. If the dark matter is produced during inflation, it is hopeful to use inflation as an avenue to probe the nature of the dark matter. There are multiple possible mechanisms. One of them is that gravitational production [1] during inflation. Relevant models include Planckian Interacting Dark Matter (PIDM) [2–6], WIMPZILLA [7, 8], SUPERWIMP [9], FIMP [10] and so on. They can be scalar [11, 12], vector, fermion or spin-2 particles [13] from different types of beyond standard model physics. Such dark matter candidates are usually hard to probe using collider experiments due to the large mass and small coupling (the gravitationally produced dark matter even do not have electroweak interactions with standard model par
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