Conveners
Invited: Changbom Park - "No Evidence for a Phantom-Divide-Crossing Dark Energy"
- Chair: Mohammad Ali Gorji
Invited: Nils A. Nilsson - "Testing spacetime symmetries with current and future gravitational-wave observations"
- Chair: Swagat Mishra
Invited: Donghui Jeong - "PowerFull: Modeling wide-angle relativistic power spectrum with the TAM formalism"
- Chair: Hyunbae Park
Invited: Mairi Sakellariadou - "Cosmological and High Energy Physics implications from gravitational-wave background searches in LIGO-Virgo-KAGRA's O1-O4a runs"
- Chair: Shinji Mukohyama
Invited: Ana Achucarro - "Ultra-slow-turn inflation"
- Chair: Yusuke Yamada
Invited: Sabir Ramazanov - "Cosmic domain walls: theory and lattice observations"
- Chair: Antonio De Felice
Invited: Gianmassimo Tasinato - " Gravitational Waves Probes of Fundamental Physics: Theory Perspective"
- Chair: Antonio De Felice
Invited: Seong Chan Park - "Superheavy Dark Matter: theory and experiment"
- Chair: Dong-Won Jung
Invited: Antonio De Felice - "Dark Energy in Light of Current Observations and Modified Gravity"
- Chair: Sebastian Bahamonde
Invited: Tsutomu Kobayashi - "Spinoptics in the presence of axion-like particles in curved spacetime"
- Chair: Sebastian Bahamonde
Invited: Shinji Mukohyama - "Emergent time and big-bang"
- Chair: Mohammad Ali Gorji
Invited: Matteo Magi
- Chair: Nils Albin Nilsson
Invited: Takahiro Matsubara
- Chair: Swagat Mishra
Invited: Teruaki Suyama
- Chair: Hyunbae Park
Invited: Jaume Garriga
- Chair: Yusuke Yamada
Invited: Misao Sasaki
- Chair: Yusuke Yamada
Invited: Viatcheslav Mukhanov
- Chair: Sebastian Bahamonde
Invited: Fawad Hassan
- Chair: Nils Albin Nilsson
Invited: Alexander Vikman
- Chair: Dong-Won Jung
-
27/04/2026, 09:20
We apply an extended Alcock–Paczyński (AP) test to the SDSS data to constrain the dark energy equation of state with the Chevallier–Polarski–Linder (CPL) parametrization. The extended AP test method uses the full shape of redshift-space two-point correlation funcion(CF) as the standard shape in order to measure the expansion history of the universe. We calibrate the standard shape by using...
Go to contribution page -
27/04/2026, 11:50
Gravitational waves are now standard tools in modern cosmology, including as probes of fundamental physics. In this talk, I will describe recent results in the efforts to test the symmetries of general relativity using gravitational-waves. Motivated by quantum-gravity phenomenology, I will describe the effective-field theory approach to breaking symmetries and how they can be tested, and I...
Go to contribution page -
27/04/2026, 15:00
The upcoming generation of wide and deep galaxy surveys, such as SPHEREx and Euclid, will provide a unique opportunity to probe the ultra-large scales of structure formation, where primordial non-Gaussianity, often parameterized by fNL, is expected to leave its most detectable imprint. At the same time, these surveys inevitably enter regimes where relativistic and wide-angle effects become...
Go to contribution page -
28/04/2026, 09:00
I will summarise the most recent LVK results searching for a gravitational-wave background of cosmological origin.
Go to contribution page -
28/04/2026, 10:30
Multifield inflation models involving ultra-light fields such as moduli and axions are a generic outcome of string and supergravity cosmology. In this talk we consider under what conditions their primordial perturbation spectra may be consistent with observations on the largest (CMB) scales. The usual route is to stabilise the light fields so as to recover single-field inflation. Another...
Go to contribution page -
29/04/2026, 10:30
I will report results of lattice simulations for cosmic domain walls. The main focus will be on the spectra of gravitational waves produced by these topological defects. There are various types of spectra to be discussed, which originate from different types of domain walls: long-living domain walls, annihilating ones, as well as melting walls characterized by a time-dependent tension. On the...
Go to contribution page -
29/04/2026, 11:30
-
30/04/2026, 10:30
I will discuss the current status of dark matter physics and suggest new territory of superheavy regime.
Go to contribution page -
01/05/2026, 10:30
Current cosmological observations have established the accelerated expansion of the Universe, yet the physical nature of dark energy remains elusive. We summarize the current status of cosmology as inferred from observational data and discuss the implications for the nature of dark energy. We review the main observational probes, highlight existing tensions between datasets within the standard...
Go to contribution page -
01/05/2026, 11:30
We study the propagation of high-frequency electromagnetic waves in curved spacetime in the presence of axion-like scalar fields. We employ the spinoptics approximation and extend the covariant effective action approach recently developed by Frolov to incorporate axion–photon coupling. The resulting spinoptics equations are solved in the background of a Schwarzschild black hole dressed with an...
Go to contribution page -
01/05/2026, 15:10
We proposes a new avenue for understanding the cosmological singularity. The standard cosmological model contains a generic initial singularity usually referred to as the big bang. Herein, we present a novel idea to extend the description of our Universe beyond this limit. The proposal relies on rewriting physics in a purely Riemannian, i.e. locally Euclidean, 4-dimensional space and the...
Go to contribution page -