visual
visual

세미나

  • HOME
  • >
  • 소식
  • >
  • 세미나
날짜 2020-12-10 13:55 
연사  
장소 Zoom 

Title : Consistency of Boltzmann equation and light dark matter from inflaton decay 

 
Speaker: Dr Yin Wen (University of Tokyo)

 

Abstract:
Boltzmann equation plays important roles in particle cosmology in studying the evolution of distribution functions (also called as
occupation numbers) of various particles. For the case of the decay of a scalar condensation into a pair of scalar particles, we
point out that the system may not be well described by the Boltzmann equation when the occupation number of daughter particles becomes large even in the so-called narrow resonance regime.
In the second part, I will show a new simple mechanism for the light dark matter (DM) production from the decay of the oscillating
inflaton condensation. If the reheating temperature after inflation is higher than the inflaton mass, which is of the same order of the momentum of the DM at the time of the production, the DM momentum can be suppressed compared to the temperature of the thermal plasma if the interaction of the DM is weak enough. In addition, the DM can be abundant enough.

 

Zoom Link:
Time: Dec 10, 2020 01:55 PM Seoul

 

 

Meeting ID: 875 7667 2928
Passcode: 028371
번호 날짜 연사 제목
공지 2025-02-24 16:00    2025년 봄학기 콜로키움 안내
공지 2025-02-27 16:00    2025년 봄 물리학과 특별세미나 (광학/응집물리 분야)
594 2015-07-16 16:00    Next-generation ultrafast laser technology for nonlinear optics and strong-field physics
593 2015-07-16 16:00    KAIST Physics Distinguished Lecture
592 2015-07-23 13:30    Enhanced ZnO based UV photonics and related applications file
591 2015-08-03 10:30    Axion Search
590 2015-08-04 11:00    Propagation of ultrasound through two- and three-dimensional strongly scattering media
589 2015-09-07 15:00    Advanced Optical Materials and Devices at NRL
588 2015-09-07 16:00    Physics Colloquium : 2015 Fall file
587 2015-09-14 14:00    Ultrafast X-ray Studies on Dynamics Matter in Extreme Conditions
586 2015-09-15 16:00    Physics Colloquium : 2014 Fall file
585 2015-10-14 18:00    인터스텔라 영화 속의 물리 file
584 2015-10-15 10:00    Development of Large-Bore, High Field Magnets at the NHMFL
583 2015-10-16 15:00    High Magnetic Fields to Probe the sub-eV range of Particle/Astroparticle Physics - From the OSQAR experiments at CERN up to new perspectives at LNCMI-Grenoble
582 2015-10-16 16:00    Fluctuations of entropy production in partially masked electric circuits
581 2015-10-23 10:30    How to write a good scientific paper[Open lecture series]
580 2015-10-23 15:00    Development of a Rogowski Coil as a new beam position monitor
579 2015-11-06 16:30    Topological Dirac line nodes in centrosymmetric semimetals
578 2015-11-10 16:00    Rapid heating of matter using high power lasers
577 2015-11-19 16:00    Emergent Collective Phenomena and Functions at Reduced Dimensions
576 2015-11-23 13:30    What's Beyond the Standard Model? Lessons from Run I and what might come in Run II
575 2015-11-24 16:00    Topology-based understanding of spin dynamics in inhomogeneously magnetized systems