Unified Origin of Curvature Perturbation and Baryon Asymmetry of the Universe

doi:arXiv:2410.07694

	Unified Origin of Curvature Perturbation and Baryon Asymmetry of the Universe
	Ghoshal, Anish 1; Naskar, Abhishek2 ; Okada, Nobuchika 3
	2024-10-10
状态	已发表
摘要	We propose a unified framework that describes both the curvaton mechanism for generating primordial density fluctuations and the Affleck-Dine (AD) field for baryogenesis. By introducing a complex scalar field (AD field) carrying a baryon/lepton number and its potential consisting of quadratic and quartic terms with a small baryon/leptonnumber-violating mass term, we investigate the evolution of the scalar field during the radiation-dominated era following inflation. We set the initial conditions such that the quartic term dominates the scalar potential, and the angular component of the AD field is non-zero. We focus on a scenario where the AD field decays early, ensuring that its energy density never dominates over that of radiation. We show that the radial component of the AD field can be identified with the curvaton to solely produce the Planck normalized scalar power spectrum while the evolution of the angular component is crucial for generating the observed baryon asymmetry of the universe. Additionally, we find that the amplitude of scalar bispectrum f_NL is positive, with an amplitude of O (1), which is consistent with the current Planck data and testable in future observations such as CMB-S4, LiteBIRD, LSS, and 21-cm experiments. In our estimation of the scalar power spectrum and bispectrum, we develop a novel analytical scheme for computing scalar fluctuations based on the Î´N formalism, which allows us to deal with the evolution of curvaton with polynomial potential more accurately in comparison to the existing analytical methods.
语种	英语
DOI	arXiv:2410.07694
相关网址	查看原文
出处	Arxiv
收录类别	PPRN.PPRN
WOS记录号	PPRN:105778220
WOS类目	Astronomy& Astrophysics ; Physics, Particles& Fields
资助项目	U.S. DOE["DE-SC0012447","DE-SC0023713"]
文献类型	预印本
条目标识符	https://kms.shanghaitech.edu.cn/handle/2MSLDSTB/442484
专题	物质科学与技术学院物质科学与技术学院_PI研究组_Alexey S. Koshelev组
通讯作者	Ghoshal, Anish
作者单位	1.Univ Warsaw, Inst Theoret Phys, Fac Phys, Ul Pasteura 5, PL-02093 Warsaw, Poland 2.ShanghaiTech Univ, Sch Phys Sci & Technol, 393 Middle Huaxia Rd, Shanghai 201210, Peoples R China 3.Univ Alabama, Dept Phys & Astron, Tuscaloosa, AL 35487, USA
推荐引用方式 GB/T 7714	Ghoshal, Anish,Naskar, Abhishek,Okada, Nobuchika. Unified Origin of Curvature Perturbation and Baryon Asymmetry of the Universe. 2024.