Cheong, Dhong Yeon - 检索结果 - CERN Document Server

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Wormhole-Induced ALP Dark Matter / Cheong, Dhong Yeon (IPAP, Seoul ; Yonsei U.) ; Hamaguchi, Koichi (Tokyo U. ; Tokyo U., IPMU) ; Kanazawa, Yoshiki (Tokyo U.) ; Lee, Sung Mook (CERN) ; Nagata, Natsumi (Tokyo U.) ; Park, Seong Chan (IPAP, Seoul ; Yonsei U. ; Korea Inst. Advanced Study, Seoul)
Non-perturbative gravitational effects induce explicit global symmetry breaking terms within axion models. [...]
CERN-TH-2024-195 ; arXiv:2411.07713. - 25.
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Effective Theory Approach for Axion Wormholes / Cheong, Dhong Yeon (IPAP, Seoul ; Yonsei U. ; CERN) ; Park, Seong Chan (IPAP, Seoul ; Yonsei U. ; Korea Inst. Advanced Study, Seoul) ; Shin, Chang Sub (Chungnam Natl. U. ; IBS, Daejeon, CTPU ; Korea Inst. Advanced Study, Seoul)
We employ the effective field theory approach to analyze the characteristics of Euclidean wormholes within axion theories. Using this approach, we obtain non-perturbative instantons in various complex scalar models with and without a non-minimal coupling to gravity, as well as models featuring the $R^2$ term for a range of coupling values. [...]
arXiv:2310.11260; CERN-TH-2023-184.- 2024-07-04 - 25 p. - Published in : JHEP 2407 (2024) 039 Fulltext: document - PDF; 2310.11260 - PDF;

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Axion quality problem and nonminimal gravitational coupling in the Palatini formulation / Cheong, Dhong Yeon (IPAP, Seoul ; Yonsei U.) ; Hamaguchi, Koichi (Tokyo U. ; Tokyo U., IPMU) ; Kanazawa, Yoshiki (Tokyo U.) ; Lee, Sung Mook (IPAP, Seoul ; Yonsei U. ; CERN) ; Nagata, Natsumi (Tokyo U.) ; Park, Seong Chan (IPAP, Seoul ; Yonsei U. ; Korea Inst. Advanced Study, Seoul)
In axion models, the global U(1) Peccei-Quinn (PQ) symmetry is explicitly broken by non-perturbative effects of gravity, such as axionic wormholes. The gravitational violation of the PQ symmetry due to wormholes is large enough to invalidate the PQ mechanism, which is entitled as the axion quality problem. [...]
arXiv:2210.11330; CERN-TH-2022-167.- 2023-07-01 - 7 p. - Published in : Phys. Rev. D 108 (2023) 015007 Fulltext: 2210.11330 - PDF; Publication - PDF;

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Beyond the Starobinsky model for inflation / Cheong, Dhong Yeon (Yonsei U.) ; Lee, Hyun Min (Chung-Ang U. ; CERN) ; Park, Seong Chan (Yonsei U.)
We single out the Starobinsky model and its extensions among generic $f(R)$ gravity as attractors at large field values for chaotic inflation. Treating a $R^3$ curvature term as a perturbation of the Starobinsky model, we impose the phenomenological bounds on the additional term satisfying the successful inflationary predictions. [...]
arXiv:2002.07981; YHEP-COS20-04; CAU-THEP-2020-02; CERN-TH-2020-022.- 2020-06-10 - 8 p. - Published in : Phys. Lett. B 805 (2020) 135453 Article from SCOAP3: PDF; Fulltext: PDF;

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