Conveners
Parallel sessions: Gravity - foundational aspects
- Joshua Baines (The University of Melbourne)
Parallel sessions: Early universe cosmology
- Misao Sasaki (Asia Pacific Center for Theoretical Physics)
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Jun Zhang (International Centre for Theoretical Physics Asia-Pacific)06/07/2026, 15:40Parallel Session Talk
Ultralight bosonic fields can undergo exponential amplification around rotating black holes through black hole superradiance. This process can result in black hole spin-down, continuous gravitational-wave emission, and many other observable consequences, providing a powerful probe of dark particles in the strong-gravity regime. In particular, the LVK Collaboration has placed constraints on...
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Tomoki KATAYAMA06/07/2026, 16:00Parallel Session Talk
The Horndeski theory represents the most comprehensive framework within scalar-tensor theories, comprising a single scalar field whose equations of motion are closed up to second-order derivatives. Nonetheless, systematic extensions involving multiple scalar fields remain incomplete: while the general form of the equations of motion for two fields (bi-Horndeski) is established, the overarching...
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Run-Qiu Yang (Tianjin University)06/07/2026, 16:20Parallel Session Talk
We investigate the problem of bulk metric reconstruction in holography by leveraging the inverse scattering framework applied to boundary two-point correlation functions. It shows that the bulk metric of a planar/spherically /hyperbolically symmetric asymptotically anti-de Sitter static black brane/hole can be reconstructed from its boundary frequency 2-point correlation functions by solving...
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Diego Cruces Mateo (Institute of Theoretical Physics - Chinese Academy of Sciences (ITP,CAS))08/07/2026, 15:40Parallel Session Talk
Stochastic inflation is a fully non-perturbative approach that allows us to study rare, large inhomogeneities generated during inflation. These inhomogeneities are phenomenologically very interesting because they can lead to the formation of primordial black holes, which are a candidate for dark matter. In this talk, after giving a pedagogical introdution to the stochastic approach to...
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Dr Swagat Saurav Mishra (Centre for Theoretical Physics of the Universe, Institute for Basic Science)08/07/2026, 16:00Parallel Session Talk
The transition from cosmic inflation to the hot Big Bang phase, known as reheating, remains a key open question in inflationary cosmology. During its early 'preheating' stage, the inflaton field is expected to decay explosively via parametric resonance into lighter bosonic offspring fields. However, when such external couplings are very weak, strong enough self-interaction causes the...
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Prof. Cindy Gulis (Department of Astronomy & Astrophysics, The Pennsylvania State University)08/07/2026, 16:20Parallel Session Talk
The standard Lambda–Cold–Dark–Matter (LambdaCDM) cosmological model has been remarkably successful in describing the large-scale Universe, yet it faces growing challenges from observations, including the persistent Hubble tension, emerging evidence of evolving dark energy, and the unexpectedly abundant population of massive galaxies discovered by JWST at redshift z>10. These observations...
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Rui HU (Chinese University of Hong Kong)08/07/2026, 16:40Parallel Session Talk
Sterile neutrinos with masses on the $\mathrm{eV}$ scale are promising candidates to account for the origin of neutrino mass and the reactor neutrino anomalies. The mixing between sterile and active neutrinos in the early universe could result in a large abundance of relic sterile neutrinos, which depends on not only their physical mass $m_{\rm phy}$ but also their degree of thermalization,...
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Prof. Tsang Keung Chan (the Chinese University of Hong Kong)08/07/2026, 17:00Parallel Session Talk
The Lambda Cold Dark Matter paradigm, with a power-law primordial power spectrum, explains successfully the large-scale (>> Mpc) structure of the Universe. However, the small-scale (< Mpc) structures are relatively unconstrained. Recently, JWST has found surprisingly early formation of massive galaxies at high redshifts. Small, dense, dark matter subhaloes have been inferred from strong...
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