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Browsing 14.Energetic Cosmos Laboratory by Title

Now showing items 10-16 of 16

THE MIRROR AT THE EDGE OF THE UNIVERSE: REFLECTIONS ON AN ACCELERATED BOUNDARY CORRESPONDENCE WITH DE SITTER COSMOLOGY

Zhakenuly, Abay; Good, Michael R.R.; Linder, Eric V. (arxiv, 2020)

An accelerated boundary correspondence (ABC) is solved for the de Sitter moving mirror cos mology. The beta Bogoliubov coefficients reveal the particle spectrum is a Planck distribution with temperature inversely proportional ...
NGC 6240 SUPERMASSIVE BLACK HOLE BINARY DYNAMICAL EVOLUTION BASED ON CHANDRA DATA

Sobolenko, M; Kompaniiets, O; Berczik, P; Marchenko, V; Vasylenko, A; Fedorova, E; Shukirgaliyev, B (Monthly Notices of the Royal Astronomical Society, 2022)

The main idea of our research is to estimate the physical coalescence time of the double supermassive black hole (SMBH) system in the centre of NGC 6240 based on the X-ray observations from the Chandra space observatory. ...
A NUMERICAL STUDY OF STELLAR DISCS IN GALACTIC NUCLEI

Panamarev, Taras; Kocsis, Bence (Monthly Notices of the Royal Astronomical Society, 2022)

We explore the dynamics of stellar discs in the close vicinity of a supermassive black hole (SMBH) by means of direct N-body simulations. We show that an isolated nuclear stellar disc exhibits anisotropic mass segregation ...
ON-SKY SILICON PHOTOMULTIPLIER DETECTOR PERFORMANCE MEASUREMENTS FOR MILLISECOND TO SUB-MICROSECOND OPTICAL SOURCE VARIABILITY STUDIES

Lau, Albert Wai Kit; Shafiee, Mehdi; Smoot, George F.; Grossan, Bruce; Li, Siyang; Maksut, Zhanat (arxiv, 2020)

In our Ultra-Fast Astronomy (UFA) program, we aim to improve measurements of variability of astro nomical targets on millisecond and shorter time scales. In this work, we present initial on-sky measurements of the performance ...
ON THE DUALITY OF SCHWARZSCHILD-DE SITTER SPACETIME AND MOVING MIRROR

Fernandez-Silvestre, Diego; Foo, Joshua; Good, Michael R.R. (Classical and Quantum Gravity, 2022)

The Schwarzschild-de Sitter (SdS) metric is the simplest spacetime solution in general relativity with both a black hole event horizon and a cosmological event horizon. Since the Schwarzschild metric is the most ...
OUT OF ONE, MANY: DISTINGUISHING TIME DELAYS FROM LENSED SUPERNOVAE

Denissenya, Mikhail; Bag, Satadru; Kim, Alex G; Linder, Eric V; Shafieloo, Arman (Monthly Notices of the Royal Astronomical Society, 2022)

Gravitationally lensed Type Ia supernovae are an emerging probe with great potential for constraining dark energy, spatial curvature, and the Hubble constant. The multiple images and their time delayed and magnified fluxes ...
UNDERSTANDING THE ‘FEEBLE GIANT’ CRATER II WITH TIDALLY STRETCHED WAVE DARK MATTER

Pozo, Alvaro; Broadhurst, Tom; Emami, Razieh; Smoot, George (Monthly Notices of the Royal Astronomical Society, 2022)

The unusually large ‘dwarf’ galaxy Crater II, with its small velocity dispersion, ≃3 km s−1, defies expectations that low-mass galaxies should be small and dense. We combine the latest stellar and velocity dispersion ...