(Seminar) Are induced gravitational waves gauge dependent? (诱导引力波依赖于规范吗?)

CAS Key Laboratory of Theoretical Physics

Institute of Theoretical Physics

Chinese Academy of Sciences

Seminar

Title

题目

ITP-CAS Gravity and Cosmology Seminar 1:
Are induced gravitational waves gauge dependent? (诱导引力波依赖于规范吗?)

Speaker

报告人

Guillem Domènech

Affiliation

所在单位

Istituto Nazionale di Fisica Nucleare Sezione di Padova

Date

日期

17:00, Wednesday, Jan 20, 2021

Venue

地点

Online Zoom meeting: https://zoom.us/j/92456377730

Contact Person

所内联系人

Shi Pi

Abstract

摘要

 Primordial black hole formation is always accompanied by a large amount of induced gravitational waves (GWs), in principle observable by future GWs detectors. However, the theoretical expression of the induced GW spectral density is strictly speaking gauge dependent. This gauge dependence thus casts doubts on the theoretical predictions of the induced GWs.  In this talk, I will investigate in detail the gauge issue of the induced GWs. I will show that, under reasonable assumptions, the induced GWs is for all practical purposes gauge independent.  Thus, free of ambiguities, induced GWs are an excellent source of information about the primordial universe.