Kavli Affiliate: Masahiro Kawasaki | First 5 Authors: Masahiro Kawasaki, Kai Murai, , , | Summary: The recent observation of $^4$He implies that our universe has a large lepton asymmetry. We consider the Affleck-Dine (AD) mechanism for lepton number generation. In the AD mechanism, non-topological solitons called L-balls are produced, and the generated lepton number […]
Kavli Affiliate: Masahiro Kawasaki | First 5 Authors: Akinori Matsumoto, Masami Ouchi, Kimihiko Nakajima, Masahiro Kawasaki, Kai Murai | Summary: The primordial He abundance $Y_P$ is a powerful probe of cosmology. Currently, $Y_P$ is best determined by observations of metal-poor galaxies, while there are only a few known local extremely metal-poor ($<0.1 Z_odot$) galaxies (EMPGs) […]
Kavli Affiliate: Masahiro Kawasaki | First 5 Authors: Akinori Matsumoto, Masami Ouchi, Kimihiko Nakajima, Masahiro Kawasaki, Kai Murai | Summary: The primordial He abundance $Y_mathrm{P}$ is a powerful probe of cosmology. Currently, $Y_mathrm{P}$ is best determined by observations of metal-poor galaxies, while there are only a few known local extremely metal-poor ($<0.1 Z_odot$) galaxies (EMPGs) […]
Kavli Affiliate: David Spergel | First 5 Authors: Kevork Abazajian, Arwa Abdulghafour, Graeme E. Addison, Peter Adshead, Zeeshan Ahmed | Summary: This Snowmass 2021 White Paper describes the Cosmic Microwave Background Stage 4 project CMB-S4, which is designed to cross critical thresholds in our understanding of the origin and evolution of the Universe, from the […]
Kavli Affiliate: Shigeki Matsumoto | First 5 Authors: Alexander Aryshev, Ties Behnke, Mikael Berggren, James Brau, Nathaniel Craig | Summary: The International Linear Collider (ILC) is on the table now as a new global energy-frontier accelerator laboratory taking data in the 2030s. The ILC addresses key questions for our current understanding of particle physics. It […]
Kavli Affiliate: Takeo Higuchi | First 5 Authors: Alexander Aryshev, Ties Behnke, Mikael Berggren, James Brau, Nathaniel Craig | Summary: The International Linear Collider (ILC) is on the table now as a new global energy-frontier accelerator laboratory taking data in the 2030s. The ILC addresses key questions for our current understanding of particle physics. It […]
Kavli Affiliate: Takeo Higuchi | First 5 Authors: Alexander Aryshev, Ties Behnke, Mikael Berggren, James Brau, Nathaniel Craig | Summary: The International Linear Collider (ILC) is on the table now as a new global energy-frontier accelerator laboratory taking data in the 2030s. The ILC addresses key questions for our current understanding of particle physics. It […]
Kavli Affiliate: Takeo Higuchi | First 5 Authors: Alexander Aryshev, Ties Behnke, Mikael Berggren, James Brau, Nathaniel Craig | Summary: The International Linear Collider (ILC) is on the table now as a new global energy-frontier accelerator laboratory taking data in the 2030s. The ILC addresses key questions for our current understanding of particle physics. It […]
Kavli Affiliate: Tom Melia, Shigeki Matsumoto | First 5 Authors: Tsuguo Aramaki, Mirko Boezio, James Buckley, Esra Bulbul, Philip von Doetinchem | Summary: This white paper discusses the current landscape and prospects for experiments sensitive to particle dark matter processes producing photons and cosmic rays. Much of the gamma-ray sky remains unexplored on a level […]
Kavli Affiliate: Shunsaku Horiuchi | First 5 Authors: Rebecca K. Leane, Seodong Shin, Liang Yang, Govinda Adhikari, Haider Alhazmi | Summary: Intriguing signals with excesses over expected backgrounds have been observed in many astrophysical and terrestrial settings, which could potentially have a dark matter origin. Astrophysical excesses include the Galactic Center GeV gamma-ray excess detected […]