IAS Program on Particle Theory:- Cosmic Birefringence vs the Need of a New Light Field Beyond the Standard Model Particle Content
The recent analysis of the Cosmic Microwave Background(CMB) indicates a rotation of the polarization plane of the CMB photons from the last scattering surface, called cosmic birefringence. A standard explanation for this effect is a parity-odd scalar field coupled to photons, whose coherent motion, if exists, breaks parity in the photon sector along the propagation for a cosmological distance. To examine the degree of validity of this consideration, the speaker and his research team explore whether the non-zero cosmic birefringence can be interpreted within the framework of the Standard Model Effective Field Theory(SMEFT). Their systematic study reveals that indeed none of the operators in SMEFT would be able to give the reported birefringence angle. Should this observational result be confirmed, therefore, the existence of a new particle beyond SMEFT that is much lighter than the electroweak scale would be an inevitable conclusion.
時間：2023.05.11(四) 14:00~15:00
地點：香港科技大學 李兆基校園 盧家驄薈萃樓4樓 高研院4042室
講者：Dr. Ryo NAMBA 難波‧亮 博士 (日本 理化学研究所)
語言：英語
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理化学研究所 ↹ RIKEN
此活動由香港科技大學 賽馬會高等研究院主辦。
