Conveners
Cosmology #3
- Masahiro Kawasaki (ICRR, University of Tokyo)
Dr
Alberto Dominguez
(Universidad Complutense de Madrid)
9/12/19, 2:00 PM
Cosmology
Oral presentation in parallel session
The light emitted by all galaxies across the history of the Universe is encoded in the intensity of the extragalactic background light (EBL), the diffuse cosmic radiation field at ultraviolet, optical, and infrared wavelengths. The EBL is a source of opacity for high-energy gamma rays via pair production, leaving a characteristic attenuation imprint in the spectra of distant gamma-ray sources....
Dr
Chang Feng
(University of Illinois at Urbana-Champaign)
9/12/19, 2:20 PM
Cosmology
Oral presentation in parallel session
Reionization is a unique epoch in Cosmology and studies of the epoch of reionization (EoR) can tell us important information about ionization history, first luminous objects, and structure formation in the early Universe. However, the EoR is still poorly understood so far. In light of this, we investigate to what extent experiments observing at different wavelengths can detect the EoR...
Dr
Mayumi Aoki
(Kanazawa U.)
9/12/19, 2:40 PM
Cosmology
Oral presentation in parallel session
In this talk, we will discuss the testability of a scale invariant extension of the standard model with a QCD-like hidden sector by using the gravitational wave (GW) signal. The scale invariance is dynamically broken by the non-perturbative effects, which can be used to explain the origin of masses of the Higgs boson and the dark matter. In a certain region of the parameter space, the chiral...
Mr
Keisuke Inomata
(ICRR, The University of Tokyo)
9/12/19, 3:00 PM
Cosmology
Oral presentation in parallel session
We revisit the effects of an early matter dominated era on gravitational waves induced by scalar perturbations. We carefully take into account the evolution of the gravitational potential, the source of these induced gravitational waves, during a gradual transition from an early matter dominated era to the radiation dominated era, where the transition timescale is comparable to the Hubble time...
Dr
Takahiro Terada
(KEK)
9/12/19, 3:20 PM
Cosmology
Oral presentation in parallel session
We study gravitational waves induced from the primordial scalar
perturbations at second order around the reheating of the Universe.
We consider reheating scenarios in which a transition from an early
matter dominated era to the radiation dominated era completes within a
timescale much shorter than the Hubble time at that time. We find that
an enhanced production of induced gravitational...
