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Shinji Mukohyama (YITP, Kyoto U & RESCEU, U of Tokyo)5/21/26, 2:00 PM
Many dark energy (DE) models are based on a scalar field with timelike
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gradient while black holes (BHs) serve as probes of strong gravity. In
this talk we begin with a review of the systematic construction of the
effective field theory (EFT) describing perturbations around the
Minkowski background with a timelike scalar profile and its extension
to cosmological backgrounds, i.e. the ghost... -
Tom Melia (Kavli IPMU)5/21/26, 2:30 PM
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Tomonori Totani (U. Tokyo)5/21/26, 3:00 PM
Fifteen years of the Fermi Large Area Telescope (LAT) data in the halo region of the Milky Way (MW) are analyzed to search for gamma rays from dark matter annihilation. Gamma-ray maps within the region of interest (|l| < 60 deg, 10 deg < |b| < 60 deg) are modeled using known components plus a halo-like component. A statistically significant halo-like excess is found with a spectral peak around...
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Masahiro Takada (Kavli IPMU)5/21/26, 4:00 PM
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Eiichiro Komatsu5/21/26, 4:30 PM
Parity symmetry is violated in the weak interaction. Do the physical laws behind unsolved cosmological problems, such as dark matter and dark energy, also violate parity symmetry? The polarized light of the cosmic microwave background is sensitive to new physics that violates parity symmetry. In this presentation, we present a tantalizing hint of parity violation in the polarization data from...
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Toshifumi Noumi (The University of Tokyo)5/22/26, 9:30 AM
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Yuko Urakawa (KEK)5/22/26, 10:00 AM
The gradient expansion and the separate universe approach provide an effective description of inflationary soft modes after coarse-graining shorter-wavelength degrees of freedom. We formulate a locality condition on the quantum state that validates this effective description. The same condition also implies a generalized soft theorem, from which the standard consistency relations follow under...
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Takahiro Sumi (U. Osaka)5/22/26, 10:30 AM
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Elisa Ferreira (Kavli IPMU)5/22/26, 11:30 AM
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Sugumi Kanno (Kyushu University)5/22/26, 12:00 PM
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Masamune Oguri (Chiba U.)5/22/26, 2:00 PM
The small-scale dark matter distribution serves as a useful probe of
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the particle nature of dark matter. I will discuss the current status
of the so-called small-scale challenges to cold dark matter,
highlighting possible new problems that have recently emerged. -
Atsushi Taruya (YITP, Kyoto U.)5/22/26, 2:30 PM
We present a novel framework to search for dark matter (DM) through its electromagnetic (EM) signatures in the terrestrial environment. Ultralight DM candidates, such as axions and dark photons, can induce nearly monochromatic EM fields via their coupling to ordinary photons. In the presence of the geomagnetic field, axion DM induces extremely low-frequency EM signals in the Earth–ionosphere...
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Ryuichiro Kitano (YITP, Kyoto U.)5/22/26, 3:30 PM
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Kunihito Ioka (YITP, Kyoto U.)5/22/26, 4:00 PM
One of the most remarkable discoveries by the James Webb Space Telescope is a population of red, compact, high-redshift galaxies known as Little Red Dots (LRDs). The presence of broad Balmer emission lines suggests active galactic nuclei powered by supermassive black holes (BHs), while LRDs exhibit unusually weak X-ray and radio emission and low variability, posing a significant puzzle. We...
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