logo

korean english

게시판

Home > 게시판 > 세미나

천체입자물리 및 우주론 이론 연구실에서 인도  The Institute of Mathematical Sciences의 Rathul Nath Raveendran 박사님을 초청하여 아래와 같이 세미나를 개최합니다.

학과 구성원 여러분의 많은 참석을 부탁 드립니다.


================================================================

Date/time: 2019. 08. 26(Mon) 14:00

 

Place: 기초과학연구소 세미나실(31317호)

 

Speaker: Dr. Rathul Nath Raveendran (The Institute of Mathematical Sciences )

 

Title: Constructing viable models of bouncing scenarios

 

Abstract:  The inflationary and the bouncing scenarios constitute two competing paradigms for the generation of perturbations in the early universe.
In this talk, I will discuss certain aspects of bouncing scenarios driven by scalar fields. First, I will discuss how to construct a model involving two scalar fields to drive the symmetric matter bounce and study the evolution of the scalar perturbations in the model. In this model, I will show that, while the scalar and tensor perturbation spectra are scale invariant over scales of cosmological interest, the tensor-to-scalar ratio proves to be much smaller than the current upper bound from the observations of the CMB anisotropies. While nearly scale invariant primordial spectra are remarkably consistent with the cosmological data, it has been repeatedly noticed that specific features in the power spectra lead to a better fit to the data. I will also demonstrate that ekpyrotic bouncing scenarios can generate specific features that have been considered in the context of inflation. In the last part of the talk, I will compare and contrast the quantum-to-classical transition of the primordial perturbations in the inflationary and bouncing scenarios.

번호 제목 날짜 조회 수
공지 <12/8(Thu.) 11:00am>노벨상 소개 강연 - 2016년 노벨 물리학상: 위상 응집 물리의 탄생 2016.11.28 1088766
596 <Nov. 2(Wed.) 4:30 PM> 현대 우주론 이론과 관찰 (Theories and observations of modern cosmology) 2016.10.19 56064
595 <12/2(Fri.) 14:00>Overview of HIMAC facility 2016.12.01 56237
594 <11/21(Wed.) 2:00pm>Origin of Hawking Radiation 2018.11.20 56267
593 <Mar.10(Wed.)> Dark matter searches in neutrino detectors 2021.03.04 56356
592 <11/23(Fri.) 11:00am>Barrier-bound States in Flat-band Systems 2018.11.19 56421
591 <May 10(Wed.) 4:30 PM>Trend and beyond of semiconductor technology (반도체 미세화 및 신기술 동향) 2017.05.04 56536
590 <March. 9(Wed.) 4:30 PM>가치 있는 대학 생활이란 무엇인가? file 2016.03.07 56571
589 학술세미나 개최 안내: Local Modes in Vibrational (and Rotational) Spectroscopy file 2015.10.01 56605
588 <Sep. 21(Wed.) 4:30 PM>광자질량의 물리학 2016.09.19 56713
587 <2/8(Fri) 2:00pm ~ > 5d SCFTs and Type IIB 5-brane webs 2019.02.01 56934
586 <Mar. 22(Wed.) 4:30 PM>Symmetry and topology in the electronic structure of solids 2017.03.15 57187
585 <March. 23(Wed.) 4:30 PM> 조선시대의 천문시계 2016.03.17 57656
584 <8/5(Fri.) 10:30> Phase Slips in Superfluid Spin Transport in Magnetic Wires 2016.08.02 57976
583 <Mar.20(Wed.)> Connecting Thermoelectricity and Superconductivity by Pressure Bridge 2019.03.13 58398
582 <4/24(금)> 초청세미나 개최 안내 file 2015.04.13 58612
581 <8/23(Thu.) 2:00pm>What will we do with near-term quantum computers? 2018.08.17 59021
580 <11/12(Mon.) 3:30pm>Dark Matter Probes with Astrophysical Observations 2018.11.05 59025
579 <Sep. 18(Fri.) 4:00 PM> Special seminar 2015.09.16 59243
578 <3/16(월)> 초청세미나 개최 안내 2015.02.27 59398
577 <5/13(수) 오후4:30분> 내가 몰랐던 대한민국 2015.05.07 59513