Dark matter and dark radiation from the early universe with a modulus coupled to the PQMSSM

Baer, Howard A.; Barger, Vernon; Deal, Robert Wiley

doi:10.1007/jhep06(2023)083

Title: Dark matter and dark radiation from the early universe with a modulus coupled to the PQMSSM

Journal Article · Thu Jun 15 00:00:00 EDT 2023 · Journal of High Energy Physics (Online)

DOI:https://doi.org/10.1007/jhep06(2023)083· OSTI ID:1992134

^[1]; Barger, Vernon ^[2]; Deal, Robert Wiley ^[1]

University of Oklahoma, Norman, OK (United States)
University of Wisconsin, Madison, WI (United States)

The supersymmetrized DFSZ axion model is especially compelling in that it contains 1. the SUSY solution to the gauge hierarchy problem, 2. the Peccei-Quinn (PQ) solution to the strong CP problem and 3. the Kim-Nilles solution to the SUSY μ problem. In a string setting, where a discrete R-symmetry ($$Z$$$^{R}_{24}$$ for example) may emerge from the compactification process, a high-quality accidental axion (accion) can emerge from the accidental, approximate remnant global U(1)_PQ symmetry where the decay constant f_a is linked to the SUSY breaking scale, and is within the cosmological sweet zone. In this setup, one also expects the presence of stringy remnant moduli fields Φ_i. Here, we consider the situation of a single light modulus Φ coupled to the PQMSSM in the early universe, with mixed axion plus higgsino-like WIMP dark matter. We evaluate dark matter and dark radiation production via nine coupled Boltzmann equations and assess the severity of the cosmological moduli problem (CMP) along with dark matter and dark radiation production rates. We find that typically the light modulus mass should be m_Φ ≳ 10⁴ TeV to avoid the moduli-induced dark matter overproduction problem. If one is able to (anthropically) tune the modulus field amplitude, we find a value of Φ₀ ≲ 10^–7m_P would be required to solve the overall CMP.

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Research Organization:: Univ. of Oklahoma, Norman, OK (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP)

Grant/Contract Number:: SC0009956; SC0017647

OSTI ID:: 1992134

Journal Information:: Journal of High Energy Physics (Online), Vol. 2023, Issue 6; ISSN 1029-8479

Publisher:: Springer NatureCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Dark matter and dark radiation from the early universe with a modulus coupled to the PQMSSM

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