361 citations · 1.2k across the 40 of their papers we have counts for
13 papers · 1 filter
Modeling Galaxy Formation in Cosmological Simulations with CRK-HACC
Nicholas Frontiere, J. D. Emberson, Michael Buehlmann +4
Self-consistently modeling baryonic effects in survey-scale cosmological simulations has become increasingly important as the diversity, precision, and statistical reach of modern…
Benchmarking AI-evolved cosmological structure formation
Xiaofeng Dong, Nesar Ramachandra, Salman Habib +1
The potential of deep learning-based image-to-image translations has recently attracted significant attention. One possible application of such a framework is as a fast, approximat…
Reducing Model Error Using Optimised Galaxy Selection: Weak Lensing Cluster Mass Estimation
Markus Michael Rau, Florian Kéruzoré, Nesar Ramachandra +1
Galaxy clusters are one of the most powerful probes to study extensions of General Relativity and the Standard Cosmological Model. Upcoming surveys like the Vera Rubin Observatory'…
Physical Benchmarking for AI-Generated Cosmic Web
Xiaofeng Dong, Nesar Ramachandra, Salman Habib +3
The potential of deep learning based image-to-image translations has recently drawn a lot of attention; one intriguing possibility is that of generating cosmological predictions wi…
Machine learning synthetic spectra for probabilistic redshift estimation: SYTH-Z
Nesar Ramachandra, Jonás Chaves-Montero, Alex Alarcon +3
Photometric redshift estimation algorithms are often based on representative data from observational campaigns. Data-driven methods of this type are subject to a number of potentia…
Constraining Gravity with a -cut Cosmic Shear Analysis of the Hyper Suprime-Cam First-Year Data
Leah Vazsonyi, Peter L. Taylor, Georgios Valogiannis +3
Using Subaru Hyper Suprime-Cam (HSC) year 1 data, we perform the first -cut cosmic shear analysis constraining both CDM and Hu-Sawicki modified gravity. To generate th…
Peculiar Velocity Estimation from Kinetic SZ Effect using Deep Neural Networks
Yuyu Wang, Nesar Ramachandra, Edgar M. Salazar-Canizales +3
The Sunyaev-Zel'dolvich (SZ) effect is expected to be instrumental in measuring velocities of distant clusters in near future telescope surveys. We simplify the calculation of pecu…
Matter Power Spectrum Emulator for f(R) Modified Gravity Cosmologies
Nesar Ramachandra, Georgios Valogiannis, Mustapha Ishak +1
Testing a subset of viable cosmological models beyond General Relativity (GR), with implications for cosmic acceleration and the Dark Energy associated with it, is within the reach…
The Caustic Design of the Dark Matter Web
Sergei F. Shandarin, Nesar S. Ramachandra
Matter density is formally infinite at the location of caustic surfaces, where dark matter sheet folds in phase-space. The caustics separate regions with different number of stream…
Dark matter haloes: a multistream view
Nesar S. Ramachandra, Sergei F. Shandarin
Mysterious dark matter constitutes about 85% of all mass in the Universe. Clustering of dark matter plays the dominant role in the formation of all observed structures on scales fr…
Tracing the cosmic web
Noam I Libeskind, Rien van de Weygaert, Marius Cautun +27
The cosmic web is one of the most striking features of the distribution of galaxies and dark matter on the largest scales in the Universe. It is composed of dense regions packed fu…
Topology and geometry of the dark matter web: a multistream view
Nesar S. Ramachandra, Sergei F. Shandarin
Topological connections in the single-streaming voids and multistreaming filaments and walls reveal a cosmic web structure different from traditional mass density fields. A single…
Multi-stream portrait of the Cosmic web
Nesar S. Ramachandra, Sergei F. Shandarin
We report the results of the first study of the multi-stream environment of dark matter haloes in cosmological N-body simulations in the LCDM cosmology. The full dynamical state of…