Probing gravitational dark matter
Abstract
So far all evidences of dark matter (DM) come from astrophysical and cosmological observations, due to the gravitational interactions of DM. It is possible that the true DM particle in the universe joins gravitational interactions only, but nothing else. Such a Gravitational DM (GDM) may act as a weakly interacting massive particle (WIMP), which is conceptually simple and attractive. In this work, we explore this direction by constructing the simplest scalar GDM particle χ{sub s}. It is a ℤ{sub 2} odd singlet under the standard model (SM) gauge group, and naturally joins the unique dimension4 interaction with Ricci curvature, ξ{sub s}χ{sub s}{sup 2}R, where ξ{sub s} is the dimensionless nonminimal coupling. We demonstrate that this gravitational interaction ξ{sub s}χ{sub s}{sup 2}R, together with Higgscurvature nonminimal coupling term ξ{sub h}H{sup †}HR, induces effective couplings between χ{sub s}{sup 2} and SM fields, and can account for the observed DM thermal relic abundance. We analyze the annihilation cross sections of GDM particles and derive the viable parameter space for realizing the DM thermal relic density. We further study the direct/indirect detections and the collider signatures of such a scalar GDM. These turn out to be highly predictive and testable.
 Authors:

 Institute of Modern Physics and Center for High Energy Physics, Tsinghua University, Beijing 100084 (China)
 Publication Date:
 Sponsoring Org.:
 SCOAP3, CERN, Geneva (Switzerland)
 OSTI Identifier:
 22454532
 Resource Type:
 Journal Article
 Journal Name:
 Journal of Cosmology and Astroparticle Physics
 Additional Journal Information:
 Journal Volume: 2015; Journal Issue: 03; Other Information: PUBLISHERID: JCAP03(2015)052; OAI: oai:repo.scoap3.org:9748; Article funded by SCOAP3. Content from this work may be used under the terms of the Creative Commons Attribution 3.0 License. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 14757516
 Country of Publication:
 United States
 Language:
 English
 Subject:
 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; ABUNDANCE; ANNIHILATION; ASTROPHYSICS; CROSS SECTIONS; DETECTION; GRAVITATIONAL INTERACTIONS; HIGGS MODEL; MATHEMATICAL SPACE; NONLUMINOUS MATTER; QUANTUM GRAVITY; STANDARD MODEL; UNIVERSE; WIMPS
Citation Formats
Ren, Jing, Department of Physics, University of Toronto, Toronto ON M5S1A7, He, HongJian, Center for High Energy Physics, Peking University, Beijing 100871, and Kavli Institute for Theoretical Physics China, CAS, Beijing 100190. Probing gravitational dark matter. United States: N. p., 2015.
Web. doi:10.1088/14757516/2015/03/052.
Ren, Jing, Department of Physics, University of Toronto, Toronto ON M5S1A7, He, HongJian, Center for High Energy Physics, Peking University, Beijing 100871, & Kavli Institute for Theoretical Physics China, CAS, Beijing 100190. Probing gravitational dark matter. United States. doi:10.1088/14757516/2015/03/052.
Ren, Jing, Department of Physics, University of Toronto, Toronto ON M5S1A7, He, HongJian, Center for High Energy Physics, Peking University, Beijing 100871, and Kavli Institute for Theoretical Physics China, CAS, Beijing 100190. Fri .
"Probing gravitational dark matter". United States. doi:10.1088/14757516/2015/03/052.
@article{osti_22454532,
title = {Probing gravitational dark matter},
author = {Ren, Jing and Department of Physics, University of Toronto, Toronto ON M5S1A7 and He, HongJian and Center for High Energy Physics, Peking University, Beijing 100871 and Kavli Institute for Theoretical Physics China, CAS, Beijing 100190},
abstractNote = {So far all evidences of dark matter (DM) come from astrophysical and cosmological observations, due to the gravitational interactions of DM. It is possible that the true DM particle in the universe joins gravitational interactions only, but nothing else. Such a Gravitational DM (GDM) may act as a weakly interacting massive particle (WIMP), which is conceptually simple and attractive. In this work, we explore this direction by constructing the simplest scalar GDM particle χ{sub s}. It is a ℤ{sub 2} odd singlet under the standard model (SM) gauge group, and naturally joins the unique dimension4 interaction with Ricci curvature, ξ{sub s}χ{sub s}{sup 2}R, where ξ{sub s} is the dimensionless nonminimal coupling. We demonstrate that this gravitational interaction ξ{sub s}χ{sub s}{sup 2}R, together with Higgscurvature nonminimal coupling term ξ{sub h}H{sup †}HR, induces effective couplings between χ{sub s}{sup 2} and SM fields, and can account for the observed DM thermal relic abundance. We analyze the annihilation cross sections of GDM particles and derive the viable parameter space for realizing the DM thermal relic density. We further study the direct/indirect detections and the collider signatures of such a scalar GDM. These turn out to be highly predictive and testable.},
doi = {10.1088/14757516/2015/03/052},
journal = {Journal of Cosmology and Astroparticle Physics},
issn = {14757516},
number = 03,
volume = 2015,
place = {United States},
year = {2015},
month = {3}
}