astro-ph.CO

(what is this?)

# Title: Large Neutrino Asymmetry from TeV Scale Leptogenesis in the Light of Helium Anomaly

Abstract: Motivated by the growing evidence for a large neutrino asymmetry in the early universe from the recent $^4{\rm He}$ measurements, we point out the class of leptogenesis scenarios with decay or scattering being the source of lepton asymmetry, simultaneously consistent with such a large neutrino asymmetry as well as the observed baryon asymmetry of the universe. Considering $1 \rightarrow 2, 1 \rightarrow 3$ as well as $2 \rightarrow 2$ processes to be responsible for generating the asymmetries, we show that only TeV scale leptogenesis preferably of $1 \rightarrow N \, (N \geq 3)$ type can generate the required lepton asymmetry around sphaleron temperature while also generating a large neutrino asymmetry $\sim \mathcal{O}(10^{-2})$ by the epoch of the big bang nucleosynthesis. This also offers the possibility of cogenesis if dark matter is in the form of a sterile neutrino resonantly produced in the early universe due to the presence of a large neutrino asymmetry. While such low scale leptogenesis has tantalising detection prospects at laboratory experiments, the indication of a large neutrino asymmetry provides a complementary indirect signature.
 Comments: 6 pages, 5 captioned figures Subjects: High Energy Physics - Phenomenology (hep-ph); Cosmology and Nongalactic Astrophysics (astro-ph.CO) Cite as: arXiv:2206.14722 [hep-ph] (or arXiv:2206.14722v1 [hep-ph] for this version)

## Submission history

From: Debasish Borah [view email]
[v1] Wed, 29 Jun 2022 15:42:27 GMT (36kb,D)

Link back to: arXiv, form interface, contact.
{"extraction_info": {"found_math": true, "script_math_tex": 0, "script_math_asciimath": 0, "math_annotations": 0, "math_alttext": 0, "mathml": 0, "mathjax_tag": 0, "mathjax_inline_tex": 1, "mathjax_display_tex": 0, "mathjax_asciimath": 0, "img_math": 0, "codecogs_latex": 0, "wp_latex": 0, "mimetex.cgi": 0, "/images/math/codecogs": 0, "mathtex.cgi": 0, "katex": 0, "math-container": 0, "wp-katex-eq": 0, "align": 0, "equation": 0, "x-ck12": 0, "texerror": 0, "math_score": 0.7775516510009766, "perplexity": 3241.463287815796}, "config": {"markdown_headings": true, "markdown_code": true, "boilerplate_config": {"ratio_threshold": 0.18, "absolute_threshold": 10, "end_threshold": 15, "enable": true}, "remove_buttons": true, "remove_image_figures": true, "remove_link_clusters": true, "table_config": {"min_rows": 2, "min_cols": 3, "format": "plain"}, "remove_chinese": true, "remove_edit_buttons": true, "extract_latex": true}, "warc_path": "s3://commoncrawl/crawl-data/CC-MAIN-2023-14/segments/1679296943471.24/warc/CC-MAIN-20230320083513-20230320113513-00725.warc.gz"}