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)
575 2015-11-28 10:00    Electron Tunneling Spectroscopy of Single and Bilayer Graphene with Hexagonal Boron Nitride as Tunneling Barrier
574 2015-12-01 16:00    Introducing extra dimensions to spectroscopic studies of advanced quantum materials
573 2015-12-02 16:00    Samarium Hexaboride: Is it a Topological insulator?
572 2015-12-03 16:00    Hybrid solid state spin qubits in wide bandgap semiconductors
571 2015-12-09 11:00    Functional Imaging & Monitoring of Brain & Breast with Diffuse Light
570 2015-12-09 14:00    SWELLABLE COLLOIDAL PARTICLES ARE SWELL
569 2015-12-11 13:30    Quantum spin liquid in the 1/3 depleted triangular lattice Ba3(Ru1-xIrx)Ti2O9
568 2015-12-11 15:45    Dynamical mean field theory studies on heavy fermion system
567 2015-12-17 11:00    Wavefront engineering for in-vivo Deep brain imaging
566 2016-01-11 16:00    Mott Physics in the Strong Spin-Orbit Coupling Regime
565 2016-01-26 14:00    Electrochemistry on Nano- and Atomic Levels: Scanning Probe Microscopy Meets Deep Data
564 2016-03-07 16:00    Physics Colloquium : 2016 Spring file
563 2016-03-11 13:30    Physics Seminar Serises : 2016 Spring file
562 2016-03-11 13:30    Topological phases of matter in nonequilibrium: Topology of the Wannier-Stark ladder
561 2016-03-11 16:00    Jan. Switching handedness of of chiral solitons in Z4 topological insulators
560 2016-04-01 14:30    Interference of single charged particles without a loop and dynamic nonlocality
559 2016-04-01 16:15    Cotunneling drag effect in Coulomb-coupled quantum dots
558 2016-04-04 09:30    Radio frequency engineering
557 2016-04-05 16:00    A new impurity solver for multi-orbital systems: adaptive truncation of the Hilbert space
556 2016-04-06 15:30    Superconducting Quantum Interference Devices for Precision Detection