세종대학교 두드림 비교과통합관리시스템

물리천문학과 콜로퀴움

‧강연 제목 :  Measurements of the Expansion Rate of the Universe and the Lingering Hubble Tension 

‧연사 : Dan Scolnic (Duke) 교수님

‧일시 : 2024년 7월 3일 (수요일) 14:00~15:30

‧진행 방법 : 영실관 601호

‧신청 가능 대상 : 세종대학교 재학생 누구나

‧신청기간 : 7월 1일 ~ 7월 3일

‧강의 초록

The standard model of cosmology has passed every test over the last twenty years.  Yet it remains unsatisfactory, with 95% of the universe being dark components, whose nature we did not understand.  Now, there are possible ‘cracks’ in the model, as recent observations of the local expansion rate of the universe, parameterized by the Hubble constant, do not match predictions using data from the Cosmic Microwave Background and our standard model.  This is the best end-to-end test of our cosmological model, and currently, we do not pass the test.  I will discuss my team’s Pantheon+SH0ES measurements on the local side, and review the numerous crosschecks and tests on our data and analysis.  I will show new data from the James Webb Space Telescope and explain how it strengthens the current tension.  Finally, I will talk about how the community is moving forward, with different probes of the early and late universe, and what new theoretical ideas show the most promise.