Conveners
Presentations
- Donghui Jeong (Penn. state U & KIAS)
Presentations
- Wanil Park (Jeonbuk NU)
Presentations
- Kenji Kadota (HIAS)
Presentations
- Kyu Jung Bae (Kyungpook NU)
Presentations
- Minho Son (KAIST)
Presentations
- Hyung Do Kim (Seoul NU)
Presentations
- Takeshi Kobayashi (SISSA)
Presentations
- Jinn-Ouk Gong (Ewha Women's U)
Presentations
- Ki Young Choi (SKKU)
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Prof. Junhan Kim (KAIST)22/07/2024, 16:10
Line-intensity mapping (LIM) is an observational technique that has recently been actively used in astronomy and astrophysics research. LIM utilizes relatively small aperture telescopes to perform large-area surveys, effectively analyzing the brightness distribution of galaxies and intergalactic medium through their spectral line emissions. Probing astrophysics and cosmology using LIM has been...
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Mr Injun Jeong22/07/2024, 16:45
We introduce WimPyDD, a modular, objectโoriented and customizable Python code that calculates accurate predictions for the expected rates in Weakly Interacting Massive Particle (WIMP) directโdetection experiments within the framework of Galileanโinvariant nonโrelativistic effective theory in virtually any scenario, including inelastic scattering, an arbitrary WIMP spin and a generic WIMP...
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Dr Alexandra Dupuy (KIAS)22/07/2024, 17:10
The large-scale structures in our local Universe emerge from the rivalry between gravitation and the expansion of the Universe, akin to a cosmic tug-of-war. Peculiar velocities of galaxies reflect their motion primarily governed by gravitational interactions, making them unbiased dynamical tracers of the total matter in the Universe (including dark and luminous matter). These velocities serve...
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Dr Xin Ren (Tokyo Tech.)22/07/2024, 17:35
The newly released data of DESI has suggested an unexpected dynamical evolution of our Universe that indicates new physics beyond the standard cosmological paradigm of the LCDM.
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We reconstructed the H(z) function to get the effective dark-energy equation-of-state parameter w(z) by virtue of the Gaussian Process method using the DESI-BAO + Previous BAO data. We discovered that w(z) exhibits a... -
Prof. Minho Son (KAIST)23/07/2024, 10:00
I will discuss about theoretical and phenomenological aspects of one-point correlators of conserved and non-conserved charges in QCD
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Prof. Kyu Jung Bae (Kyungpook NU)23/07/2024, 10:35
We consider the axion-mediated scattering processes between dark matter (DM) and nucleus. The substantial contributions are made via the CP-odd gluonic current which induces the spin-dependent process. Since the QCD axion is too feebly coupled to the visible particles, non-QCD axions are necessary for the current DM experiments to accomplish the ample sensitivity. In the case of...
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Mr Heejoo Kim (KAIST)23/07/2024, 11:10
We perform lattice simulations to estimate the axion dark matter abundance radiated
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from the global cosmic strings in the post-inflationary scenario. The independent
numerical confirmation on the recently observed logarithmic growth in both the
number of strings per Hubble patch and the spectral index of the power law scaling
for the axion spectrum is reported. These logarithmic scalings... -
Dr Arghyajit Datta (Kyungpook NU)23/07/2024, 11:35
We show that the process of non-instantaneous reheating during the post-inflationary period can have a sizable impact on the charged lepton Yukawa equilibration temperature in the early Universe. This suggests relooking the effects of lepton flavors in the leptogenesis scenario where the production and decay of right-handed neutrinos take place within this prolonged era of reheating. We find...
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Prof. Masahide Yamaguchi (IBS CTPU-CGA)23/07/2024, 14:00
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Dr Satyabrata Mahaptra (SKKU)23/07/2024, 14:35
I will discuss the stochastic gravitational waves (GWs) spectrum, resulting from the emission of gravitons through bremsstrahlung, in the decay of particles produced by Hawking radiation. Although particle decays inevitably entail the emission of graviton due to bremsstrahlung, the associated decay width is notably suppressed due to the Planck scale suppression in the coupling of matter fields...
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Dr Pritha Bari (IBS CTPU-CGA)23/07/2024, 15:00
This talk explores second-order gravitational waves (GWs) originating from
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scalar-tensor perturbation interactions during the radiation-dominated phase
of the Universe. We investigate the unique features and detectability of
these GWs compared to the scalar-induced ones. Unlike scalar-scalar
induced GWs, scalar-tensor induced GWs lack resonances or logarithmic
running in the low frequency... -
Mr Wonsub Cho (SKKU)23/07/2024, 16:10
The discrepancy in the estimation of the Hubble constant, as measured by the local distance ladder and the Cosmic Microwave Background (CMB) observations, has become a significant concern, reaching a $4\sigma$ to $6\sigma$ level of significance. In this study, we investigate a particle physics model featuring an inelastic Dirac dark matter framework with a gauged $U(1)_D$ symmetry, aimed at...
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Ms Hyomin Kim (Sogang U)23/07/2024, 16:35
Weakly Interacting Massive Particles (WIMPs) can be captured in
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compact stars such as white dwarves (WDs). If they are in a Dark Matter
(DM)-rich environment, this process can lead to an increase in the star
luminosity because of the DM annihilation process. N-body simulations
indicate that the core of the Messier 4 globular cluster (where plenty of
WDs are observed) is rich of DM. We... -
Dr Qianhang Ding (IBS CTPU-CGA)23/07/2024, 17:00
We show that the merger rate of primordial black hole (PBH) binaries in the dark matter (DM) spike can greatly change the merger rate history of PBHs in late universe, since the high DM density in DM spike enhances the merger rate of PBHs, especially for the DM profile index gamma, larger than 1.7. This PBH merger rate from DM spike causes a bump structure in its merger rate history at...
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Dr Arpan Kar (Sogang U)23/07/2024, 17:25
The Weakly Interacting Massive Particle (WIMP) thermal
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decoupling scenario can be used to probe modified Cosmologies. We
apply this idea to the specific example of dilatonic Einstein
Gauss-Bonnet (dEGB) gravity, where the GaussโBonnet term is
nonโminimally coupled to a scalar field with vanishing potential. We
show that when the WIMP relic density is constrained to match the
observed... -
Prof. Hyung Do Kim (SNU)24/07/2024, 10:00
I'll introduce two ideas connecting the big problem in particle physics with cosmology.
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The first example is 'Nnaturalness' in which multiple copies of the Standard Model explain the smallness of the Higgs mass.
Dark radiation and dark neutrino would be the main prediction of the setup.
The second example is 'Weak scale as a trigger' in which the smallness of the cosmological constant is... -
Prof. Wanil Park (Jeonbuk NU)24/07/2024, 10:35
I will introduce the minimal cosmological standard model(MCSM) which we proposed recently as a minimal BSM scenario to address various theoretical/phenomenological/cosmological big puzzles in a simple framework.
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Mr Tomotaka Kuroda (IBS CTPU-CGA)24/07/2024, 11:10
Cosmological perturbations generated during inflation are the seeds of the inhomogeneity and anisotropy of our universe. In contrast with the usual perturbation theory explaining these perturbations at large scale well, the stochastic formalism is an effective theory of long-wavelength modes that incorporates probabilistic noise from short-wavelength modes as they exit the horizon. This is...
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Dr Kar Arpan (Sogang U)24/07/2024, 11:35
The fast orbital decay observed in some of the Galactic black hole Low-Mass X-ray binaries (BH-LMXBs) (of a few solar masses) can be explained by the dynamical friction between Dark Matter (DM) and the companion stars orbiting around the BHs. In these cases the values of the index of the DM spike surrounding the BHs can be pinned down with an accuracy of a few percent, way better than that for...
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Prof. Kang Young Lee (Gyeongsang NU)25/07/2024, 10:00
We explain the physics potential of the present SND@LHC experiment and the future SHiP experiment.
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Prof. Jinn-Ouk Gong (Ewha Women's U)25/07/2024, 10:35
We calculate the one-loop corrections due to the curvature perturbation to the tensor power spectrum during inflation. This requires the quartic order action of both scalar and tensor perturbations.
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Mr Fumiya Sano (IBS CTPU-CGA)25/07/2024, 11:10
Supported by observational evidence indicating that cosmological scalar perturbations were nearly Gaussian at the beginning of the universe, it is anticipated that the origin of these perturbations is quantum fluctuations. Consequently, cosmic inflation provides a valuable setting for testing the quantum nature with/of gravity. Quantumness is characterized by features such as quantum...
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Dr Yu-Min Hu (USTC)25/07/2024, 11:35
Recently, there has been increasing interest in the physical degrees of freedom (DoFs) of these generalized theories in the teleparallel framework and the strong coupling issues with the vanishing coefficient of kinetic terms at a linear level in homogeneous or static backgrounds. We take f(T) gravity as an example. On the one hand, such phenomena are frequently observed in backgrounds with...
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Prof. Donghui Jeong (Penn. state U & KIAS)25/07/2024, 14:00
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Ms Michiru Uwabo (IBS CTPU-CGA)25/07/2024, 14:35
Spherical collapse is assumed in most of the works on PBH formation from
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the primordial curvature perturbation. According to the peak theory[1],
sufficiently high peaks of a Gaussian random scalar field statistically have
spherical symmetric shapes in the homogeneous and isotropic universe,
which guarantees the above assumption. However, the PBH formation is
related to highly non-linear... -
Dr Hangil Choi (IBS CTPU-CGA)25/07/2024, 15:00
Gravitational lensing of gravitational wave(GW), or GW lensing for short, is a unique tool that enables us to explore the ultra-small-scale matter distribution in our universe. One of the distinctive features of GW lensing is its wave nature, which arises from the long wavelength of typical GW sources. Fully utilizing the wave nature, GW lensing can probe O(0.1) ~O(10) parsec scales matter...
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Ms Jiale Zhang (IBS CTPU-CGA)25/07/2024, 15:25
The motivation of this talk is to discuss how to probe gravity theories using the quasinormal modes (QNMs) in the ringdown phase of binary black hole mergers.
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In this talk, the speaker will introduce the parametrized black hole quasinormal ringdown formalism, a robust framework for analyzing the QNMs in systems resembling GR, with a focus on higher overtones. These overtones have been shown... -
Prof. Kenji Kadota (HIAS)25/07/2024, 16:10
We explore the sensitivity of the radio telescope to light dark matter, such as sub-GeV dark matter and axion-like particles. We will also discuss the complementarity of these forthcoming radio signal bounds with current experimental constraints from other investigations, highlighting the synergistic potential of multi-messenger astronomy in understanding dark matter.
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Dr Zi-Yu Tang (IBS CTPU-CGA)25/07/2024, 16:45
Plenty of efforts have been made to explore the black string and its instability, but the fate of the black strings with fewer extra dimensions is still inconclusive. Now starting from the 5D uniform black string, we show that the EHT observations of M87 and SgrA can not only rule out the black string with an infinite extra dimension, but also constrain the length of a compact extra...
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Ms Jianing Wang (ITP)25/07/2024, 17:10
Primordial Black Holes (PBHs) may be produced by gravitational collapse in regions with a large amplitude of density contrasts in the early Universe. They may provide the seeds for galaxy formation, account for a population of the LIGO-Virgo events, and the candidates of cold dark matter. The main purpose of our study is to develop a more accurate estimation for PBH abundance. We address the...
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Prof. Dong-Won Jung (IBS CTPU-CGA)26/07/2024, 10:00
We consider the phenomenology of the Higgs bosons in the hidden sector model mediated by an additional SU(2) scalar doublet. With the mediator scalar doublet, the Higgs sector of the model is extended to be that of the two Higgs doublet model of type I. The mediator scalar doublet is connected to the hidden sector with the hidden U(1)๐ gauge charge. Then the U(1)๐ gauge symmetry is...
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Ms Siyao Li (IBS CTPU-CGA)26/07/2024, 10:35
Oscillons are long-lived localized spherical solitons of real scalar field with potential flatter than quadratic. They are considered to be formed at the end of inflation and important in the early universe. Their lifetime can be greatly effected by the coupling of inflaton field to other fields. We consider an oscillon coupled with another real scalar field and investigate the effect on the...
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Dr Yuhang Zhu (IBS CTPU-CGA)26/07/2024, 11:00
Due to the extraordinarily high energy scales inherent to inflation, it naturally functions as a cosmological collider to probe physics at otherwise inaccessible energy regimes, and the information are encoded in cosmological correlators. After many efforts in recent years, the analytical structure of the correlators associated with single massive spinning field exchange is well understood....
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Prof. Stefano Scopel (Sogang U)
The Weakly Interacting Massive Particle (WIMP) thermal
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decoupling scenario can be used to probe modified Cosmologies. We
apply this idea to the specific example of dilatonic Einstein
Gauss-Bonnet (dEGB) gravity, where the GaussโBonnet term is
nonโminimally coupled to a scalar field with vanishing potential. We
show that when the WIMP relic density is constrained to match the
observed... -
Ms Heejung Hong (KAIST)
Axions and dark photons are common in many extensions of the Standard Model. The dark axion portalโan axion coupling to the dark photon and photonโcan significantly modify their phenomenology. We study the cosmological constraints on the dark axion portal from Cosmic Microwave Background (CMB) bounds on the energy density of dark radiation, N_eff. By computing the axion-photon-dark photon...
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Mr Dongkook Kim (SNU & KIAS)
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Ms Jiale Zhang (IBS CTPU-CGA)
The motivation of this talk is to discuss how to probe gravity theories using the quasinormal modes (QNMs) in the ringdown phase of binary black hole mergers.
Go to contribution page
In this talk, the speaker will introduce the parametrized black hole quasinormal ringdown formalism, a robust framework for analyzing the QNMs in systems resembling GR, with a focus on higher overtones. These overtones have been shown...