Classically scale invariant inflation, supermassive WIMPs, and adimensional gravity

Arsham Farzinnia and Seyen Kouwn
Phys. Rev. D 93, 063528 – Published 30 March 2016

Abstract

We introduce a minimal and yet comprehensive framework with CP and classical scale symmetries in order to simultaneously address the hierarchy problem, neutrino masses, dark matter, and inflation. One complex gauge singlet scalar and three flavors of the right-handed Majorana neutrinos are added to the standard model content, facilitating the see-saw mechanism, among others. An adimensional theory of gravity (Agravity) is employed, allowing for the trans-Planckian field excursions. The weak and Planck scales are induced by the Higgs portal and the scalar nonminimal couplings, respectively, once a Coleman-Weinberg dynamically generated vacuum expectation value for the singlet scalar is obtained. All scales are free from any mutual quadratic destabilization. The CP symmetry prevents a decay of the pseudoscalar singlet, rendering it a suitable WIMPzilla dark matter candidate with the correct observational relic abundance. Identifying the pseudo-Nambu-Goldstone boson of the (approximate) scale symmetry with the inflaton field, the model accommodates successful slow-roll inflation, compatible with the observational data. We reach the conclusion that a pseudo-Nambu-Goldstone inflaton, within a classically scale-symmetric framework, yields lighter WIMPzillas.

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  • Received 30 December 2015

DOI:https://doi.org/10.1103/PhysRevD.93.063528

© 2016 American Physical Society

Physics Subject Headings (PhySH)

Particles & Fields

Authors & Affiliations

Arsham Farzinnia1,* and Seyen Kouwn2,†

  • 1Center for Theoretical Physics of the Universe, Institute for Basic Science (IBS), Daejeon 34051, Republic of Korea
  • 2Center for Theoretical Astronomy, Korea Astronomy and Space Science Institute (KASI), Daejeon 34055, Republic of Korea

  • *farzinnia@ibs.re.kr
  • seyenkouwn@gmail.com

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Issue

Vol. 93, Iss. 6 — 15 March 2016

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