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Träfflista för sökning "WFRF:(Cameron Graham) srt2:(2020-2023)"

Sökning: WFRF:(Cameron Graham) > (2020-2023)

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1.
  • Bhaduri, Anindya, et al. (författare)
  • Free energy calculation using space filled design and weighted reconstruction : a modified single sweep approach
  • 2020
  • Ingår i: Molecular Simulation. - : TAYLOR & FRANCIS LTD. - 0892-7022 .- 1029-0435. ; 46:3, s. 193-206
  • Tidskriftsartikel (refereegranskat)abstract
    • A modified single sweep approach is proposed for generating free energy landscapes. The approach replaces the use of temperature-accelerated molecular dynamics (TAMD) to generate centres in collective variable (CV) space at which mean forces are computed using restrained molecular dynamics (MD) simulations with a sequential space-filling design. This approach also modifies the radial basis function reconstruction step of the traditional single sweep approach and proposes a weighted reconstruction of the free energy surface using the previously generated mean forces. The modified approach is compared to the traditional single sweep (SS) approach on the (phi, psi) dihedral free-energy map of solvated alanine dipeptide (AD). It is found that the new approach results in a more accurate reconstructed free energy than does the traditional approach when compared to the directly-computed reference free energy landscape. It is shown that the increased accuracy of the overall map stems from the improved 1-dimensional space filling (projective) property of the proposed design compared to that of the TAMD generated centres. A further enhancement in the accuracy of the crucial lower energy regions is enabled by the introduction of weights in the reconstruction step that give more importance to lower energy-valued regions.
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2.
  • Goobar, Ariel, 1962-, et al. (författare)
  • Uncovering a population of gravitational lens galaxies with magnified standard candle SN Zwicky
  • 2023
  • Ingår i: Nature Astronomy. - 2397-3366. ; 7:9, s. 1098-1107
  • Tidskriftsartikel (refereegranskat)abstract
    • Detecting gravitationally lensed supernovae is among the biggest challenges in astronomy. It involves a combination of two very rare phenomena: catching the transient signal of a stellar explosion in a distant galaxy and observing it through a nearly perfectly aligned foreground galaxy that deflects light towards the observer. Here we describe how high-cadence optical observations with the Zwicky Transient Facility, with its unparalleled large field of view, led to the detection of a multiply imaged type Ia supernova, SN Zwicky, also known as SN 2022qmx. Magnified nearly 25-fold, the system was found thanks to the standard candle nature of type Ia supernovae. High-spatial-resolution imaging with the Keck telescope resolved four images of the supernova with very small angular separation, corresponding to an Einstein radius of only θE = 0.167″ and almost identical arrival times. The small θE and faintness of the lensing galaxy are very unusual, highlighting the importance of supernovae to fully characterize the properties of galaxy-scale gravitational lenses, including the impact of galaxy substructures.
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