Welcome to the Marie Curie Project -- Cosmo-Bridge
This project has received funding from the European Union’s Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie grant agreement No 101025187
This project has received funding from the European Union’s Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie grant agreement No 101025187
Upcoming galaxy surveys such as Dark Energy Spectroscopic Survey (DESI), Euclid, Roman will provide data that cover large volume and high precision. A powerful tool to connect the observable universe with the underlying physics are N-point statistics, which depend on the value of the density field at N different points in space. N-point statistics are cosmoloigcal bridge, whose foundations are based on the imprints left over by various physical processes on the large-scale clustering pattern.
A parity transformation applied to a tetrahedron formed by a quartet of galaxies. Each vertex represents a galaxy. Choosing one galaxy (red dot) as our primary, the quartet is defined by the three vectors to the remaining vertices ri, for i=1,2,3. An effective handedness can be assigned to the vertex based on the ordering of the three side lengths. When applying a parity transformation to the galaxy quadruplet, the handedness of the given vertex is flipped along the dotted mirror plane.
Publications
Jiamin Hou, Zachary Slepian, Robert N. Cahn MNRAS 522 5701 (2023)
Robert N. Cahn, Zachary Slepian, Jiamin Hou Phys. Rev. Lett. 130 201002 (2023)
By optimally weighting a pair of density field and cross-correlating with a single density field, we can construct efficient statistics that have power spectrum like structure, but at the same time, encode 3-point statistics information.
Publications
Jiamin Hou, Azadeh Moradinezhad Dizgah et al., JCAP 2023 045 (2023)
Jiamin Hou, Azadeh Moradinezhad Dizgah et al., Phys. Rev. D 109 103528 (2024)
Comparison of computational cost between the spherical-harmonic-based NPCF algorithms using the spherical harmonics decomposition approach versus brute force. The dashed lines indicate a power-law extrapolation of the brute-force approach, which would make the NPCF almost infeasible for modern galaxy surveys.
Publications
James Sunseri (incl. Jiamin Hou) RASTI 2 62 (2023)
Oliver Philcox, Zachary Slepian, Jiamin Hou et al. MNRAS 509 2457 (2022)