Zobrazeno 1 - 10
of 5 021
pro vyhledávání: '"A. Boruah"'
Nonlinear cosmological fields like galaxy density and lensing convergence can be approximately related to Gaussian fields via analytic point transforms. The lognormal transform (LN) has been widely used and is a simple example of a function that rela
Externí odkaz:
http://arxiv.org/abs/2411.04759
Relativistic accretors are cosmic objects that pull matter from their surroundings at speeds almost equal to the light's speed. Because of the tremendous gravitational force from the accretors and the angular momentum of infalling material, which oft
Externí odkaz:
http://arxiv.org/abs/2410.12230
Accretion physics studies the process of gravitational capture of ambient matter by massive stars. The background processes are very challenging to observe and measure due to the extreme conditions in these systems. Numerical simulations play a cruci
Externí odkaz:
http://arxiv.org/abs/2409.14224
Accretion disc outbursts are re-occurring events observed in various astrophysical systems, including X-ray binaries and cataclysmic variables. These outbursts are characterized by a sudden increase in luminosity due to various instabilities in the a
Externí odkaz:
http://arxiv.org/abs/2409.11708
Autor:
Boruah, Supranta S., Fiedorowicz, Pier, Garcia, Rafael, Coulton, William R., Rozo, Eduardo, Fabbian, Giulio
Extracting non-Gaussian information from the next generation weak lensing surveys will require fast and accurate full-sky simulations. This is difficult to achieve in practice with existing simulation methods: ray-traced $N$-body simulations are comp
Externí odkaz:
http://arxiv.org/abs/2406.05867
In this study, we investigate the spin dynamics of a frustrated Kagom\'e lattice system, focusing on the nonlinearity of spin oscillations induced by a harmonic magnetic field under varying strengths of Dzyaloshinskii-Moriya interaction (DMI), exchan
Externí odkaz:
http://arxiv.org/abs/2406.03005
Autor:
Boruah, Supranta S., Eifler, Tim, Miranda, Vivian, Farah, Elyas, Motka, Jay, Krause, Elisabeth, Fang, Xiao, Rogozenski, Paul, Collaboration, The LSST Dark Energy Science
Validating modeling choices through simulated analyses and quantifying the impact of different systematic effects will form a major computational bottleneck in the preparation for 3$\times$2 analysis with Stage-IV surveys such as Vera Rubin Observato
Externí odkaz:
http://arxiv.org/abs/2403.11797
Autor:
Saraivanov, Evan, Zhong, Kunhao, Miranda, Vivian, Boruah, Supranta S., Eifler, Tim, Krause, Elisabeth
The next generation of cosmological surveys is expected to generate unprecedented high-quality data, consequently increasing the already substantial computational costs of Bayesian statistical methods. This will pose a significant challenge to analyz
Externí odkaz:
http://arxiv.org/abs/2403.12337
We update the field-level inference code KARMMA to enable tomographic forward-modelling of shear maps. Our code assumes a lognormal prior on the convergence field, and properly accounts for the cross-covariance in the lensing signal across tomographi
Externí odkaz:
http://arxiv.org/abs/2403.05484
Autor:
Zhong, Kunhao, Saraivanov, Evan, Caputi, James, Miranda, Vivian, Boruah, Supranta S., Eifler, Tim, Krause, Elisabeth
We present a new class of machine-learning emulators that accurately model the cosmic shear, galaxy-galaxy lensing, and galaxy clustering real space correlation functions in the context of Rubin Observatory year one simulated data. To illustrate its
Externí odkaz:
http://arxiv.org/abs/2402.17716