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Title: Millicharge or decay: a critical take on Minimal Dark Matter

Minimal Dark Matter (MDM) is a theoretical framework highly appreciated for its minimality and yet its predictivity. Of the two only viable candidates singled out in the original analysis, the scalar eptaplet has been found to decay too quickly to be around today, while the fermionic quintuplet is now being probed by indirect Dark Matter (DM) searches. It is therefore timely to critically review the MDM paradigm, possibly pointing out generalizations of this framework. We propose and explore two distinct directions. One is to abandon the assumption of DM electric neutrality in favor of absolutely stable, millicharged DM candidates which are part of SU(2)L multiplets with integer isospin. Another possibility is to lower the cutoff of the model, which was originally fixed at the Planck scale, to allow for DM decays. We find new viable MDM candidates and study their phenomenology in detail.
Authors:
 [1] ;  [2] ;  [3]
  1. Univ. of California, Los Angeles, CA (United States). Department of Physics and Astronomy; Università di Padova and INFN, Sezione di Padova (Italy). Dipartimento di Fisica e Astronomia
  2. Univ. of Cambridge (United Kingdom). DAMTP
  3. Université Pierre et Marie Curie, Paris (France). Institut d'Astrophysique de Paris
Publication Date:
Grant/Contract Number:
SC0009937
Type:
Accepted Manuscript
Journal Name:
Journal of Cosmology and Astroparticle Physics
Additional Journal Information:
Journal Volume: 2016; Journal Issue: 04; Journal ID: ISSN 1475-7516
Publisher:
Institute of Physics (IOP)
Research Org:
Univ. of California, Los Angeles, CA (United States). Department of Physics and Astronomy
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; dark matter theory; dark matter experiments; gamma ray experiments; gamma ray theory
OSTI Identifier:
1434597

Nobile, Eugenio Del, Nardecchia, Marco, and Panci, Paolo. Millicharge or decay: a critical take on Minimal Dark Matter. United States: N. p., Web. doi:10.1088/1475-7516/2016/04/048.
Nobile, Eugenio Del, Nardecchia, Marco, & Panci, Paolo. Millicharge or decay: a critical take on Minimal Dark Matter. United States. doi:10.1088/1475-7516/2016/04/048.
Nobile, Eugenio Del, Nardecchia, Marco, and Panci, Paolo. 2016. "Millicharge or decay: a critical take on Minimal Dark Matter". United States. doi:10.1088/1475-7516/2016/04/048. https://www.osti.gov/servlets/purl/1434597.
@article{osti_1434597,
title = {Millicharge or decay: a critical take on Minimal Dark Matter},
author = {Nobile, Eugenio Del and Nardecchia, Marco and Panci, Paolo},
abstractNote = {Minimal Dark Matter (MDM) is a theoretical framework highly appreciated for its minimality and yet its predictivity. Of the two only viable candidates singled out in the original analysis, the scalar eptaplet has been found to decay too quickly to be around today, while the fermionic quintuplet is now being probed by indirect Dark Matter (DM) searches. It is therefore timely to critically review the MDM paradigm, possibly pointing out generalizations of this framework. We propose and explore two distinct directions. One is to abandon the assumption of DM electric neutrality in favor of absolutely stable, millicharged DM candidates which are part of SU(2)L multiplets with integer isospin. Another possibility is to lower the cutoff of the model, which was originally fixed at the Planck scale, to allow for DM decays. We find new viable MDM candidates and study their phenomenology in detail.},
doi = {10.1088/1475-7516/2016/04/048},
journal = {Journal of Cosmology and Astroparticle Physics},
number = 04,
volume = 2016,
place = {United States},
year = {2016},
month = {4}
}