來自低能量暴脹的重力波信號


Seminar:- Gravitational-wave Signals from Low-energy Inflation

Detection of tensor-mode fluctuations at the largest cosmological scales is often regarded as a robust evidence of inflation and as the probe of the inflationary energy scale. Such a direct connection is however valid only if the gravitational waves (GWs) are originated from their own quantum fluctuations during inflation and are effectively decoupled from other energy contents. The speaker considers cases distinguished from this standard lore, where the GWs are sourced by particles produced during inflation. In the case of U(1) gauge fields as a source, their effects must respect the constraints from scalar perturbations, due to the higher-order nature of their sourcing mechanisms, which limits the amplitude of the sourced GWs. On the other hand, if an SU(2) gauge field acquires a background configuration that preserves the isotropy, its perturbations introduce the modes coupled to the GWs at the linearized level. The energy of the former, amplified during inflation, is then transferred to that of the latter through the linear interaction, resulting in the GW amplitudes substantially larger than the standard ones. In this talk, the speaker will discuss several potential constraints on the mechanism and demonstrate that detectable tensor mode signals are viable even for low energy inflation. 
 
時間:2017.04.11(二) 14:00
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 (McGill University)
語言:英語

免費會議,歡迎參加

#96

此活動由香港科技大學 賽馬會高等研究院主辦。

發表回覆