If dark matter is ultralight, the number density of dark matter is very high and the techniques of zero-temperature field theory are no longer valid. The dark matter number density modifies the vacuum giving it a non-negligible particle occupation number. For fermionic dark matter, this occupation number can be no larger than one. However, in the case of bosons the occupation number is...
Galaxy clusters are the largest gravitationally bound objects in the Universe. Because of their high density and high local velocity dispersion, they are ideal environments for probing the nature of dark matter. The specific properties of dark matter can have great effects on both clusters as a whole as well as on the galaxies residing in them. For example, if the self-interaction...
Scattering amplitudes are paramount to understanding the validity of quantum field theories. In this talk I will discuss scattering amplitudes of massive spin-2 particles. I will contrast the unitarity violating scales of theories of massive gravity and compact extra dimensions. I will also demonstrate how scattering amplitudes in extra dimensions can be obtained via the double copy...
Hyper-Kamiokande is a next-generation water Cherenkov detector in Japan whose construction started in early 2020 and is expected to complete in 2027.
The detector has a fiducial volume more than 8 times the size of the currently-running Super-Kamiokande detector for a total of about 188 kton fiducial volume. The full experiment includes an upgraded J-PARC neutrino beam, and a near detector...
