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Browsing 14.Energetic Cosmos Laboratory by Title

Now showing items 1-16 of 16

BLACK HOLE HOOKEAN LAW AND THERMODYNAMIC FRAGMENTATION: INSIGHTS FROM THE MAXIMUM FORCE CONJECTURE AND RUPPEINER GEOMETRY

Gennaro, Sofia Di; Good, Michael R. R.; Ong, Yen Chin (PHYSICAL REVIEW RESEARCH, 2022)

We show that the notion of “Hookean law” F = kx, suitably defined in asymptotically flat singly spinning Myers-Perry black hole space-times in dimensions d 5, is related to the Emparan-Myers fragmentation (splitting ...
CHARACTERIZATION OF A HIGH EFFICIENCY SILICON PHOTOMULTIPLIER FOR MILLISECOND TO SUB-MICROSECOND ASTROPHYSICAL TRANSIENT

Li, Siyang; Smoot, George F. (arxiv, 2020)

We characterized the S14160-3050HS Multi-Pixel Photon Counter (MPPC), a high efficiency, single channel silicon photomultiplier manufactured by Hamamatsu Photonics K.K. All measurements were performed at a room temperature ...
COMPLEMENTARITY OF PECULIAR VELOCITY SURVEYS AND REDSHIFT SPACE DISTORTIONS FOR TESTING GRAVITY

Kim, Alex G.; Linder, Eric V. (PHYSICAL REVIEW D, 2020)

Peculiar-velocity surveys of the low-redshift universe have significant leverage to constrain the growth rate of cosmic structure and test gravity. Wide-field imaging surveys combined with multiobject spectrographs [e.g., ...
DEEP LEARNING UNRESOLVED LENSED LIGHT CURVES

Denissenya, Mikhail; Linder, Eric V (Monthly Notices of the Royal Astronomical Society, 2022)

Gravitationally lensed sources may have unresolved or blended multiple images, and for time varying sources, the light curves from individual images can overlap. We use convolutional neural nets to both classify the light ...
DETECTING HELIUM REIONIZATION WITH FAST RADIO BURSTS

Linder, Eric V. (PHYSICAL REVIEW D, 2020)

Fast radio bursts (FRBs) probe the electron density of the universe along the path of propagation, making high redshift FRB sensitive to the helium reionization epoch. We analyze the signal to noise with which a detection ...
DETERMINING MODEL-INDEPENDENT H0 AND CONSISTENCY TESTS

Liao, Kai; Shafieloo, Arman; Keeley, Ryan E.; Linder, Eric V. (arxiv, 2020)

We determine the Hubble constant H0 precisely (2.3% uncertainty) in a manner independent of cosmological model through Gaussian process regression, using strong lensing and supernova data. Strong gravitational lensing ...
EXPLORING EARLY AND LATE COSMOLOGY WITH NEXT GENERATION SURVEYS

Brando, Guilherme; Linder, Eric V. (PHYSICAL REVIEW D, 2020)

Perturbations from inflation evolve into large scale structure of the late universe, and encode abundant cosmic structure formation physics. We allow freedom in the primordial power spectrum, rather than assuming a power ...
EXTREME ELECTRON ACCELERATION WITH FIXED RADIATION ENERGY

Good, Michael R. R.; Singha, Chiranjeeb; Zarikas, Vasilios (Entropy, 2022)

We examine the extreme situation of radiation from an electron that is asymptotically accelerated to the speed of light, resulting in finite emission energy. The analytic solution explicitly demonstrates the difference ...
EXTREME HAWKING RADIATION

Good, Michael R.R. (arxiv, 2020)

Modeling the collapse of an extreme Reissner-Nordstr¨om (ERN) black hole by solving the corre sponding moving mirror model for the trajectory that asymptotically approaches uniform accelera tion, we obtain the non-zero ...
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 ...