Results 71 to 80 of about 56,013 (217)

New Estimates of the Spin and Accretion Rate of the Black Hole M87*

open access: yesThe Astrophysical Journal Letters
In this Letter, we use the imaging results of M87* from the Event Horizon Telescope (EHT) to calculate the rotational velocity of the inner edge of the accretion disk and find a value of ∼0.14 c .
Michael Drew   +4 more
doaj   +1 more source

Surrounded Vaidya Solution by Cosmological Fields

open access: yes, 2018
In the present work, we study the general surrounded Vaidya solution by the various cosmological fields and its nature describing the possibility of the formation of naked singularities or black holes.
Darabi, F., Heydarzade, Y.
core   +2 more sources

Mind and Cosmos as Throughput Systems: A Convergence Through the Throughput Model

open access: yesSystems Research and Behavioral Science, Volume 43, Issue 3, Page 1212-1228, May/June 2026.
ABSTRACT This paper advances a conceptual and mathematical foundations approach by applying the throughput model (TPM) to cosmic phenomena, reframing the universe as an extended information processing system. TPM's four stages, Perception, Information, Judgement and Decision Choice, are reformulated in explicit information‐theoretic and dynamical ...
Waymond Rodgers
wiley   +1 more source

Astrophysical black holes [PDF]

open access: yes, 2019
In this chapter, we introduce the concept of a black hole (BH) and recount the initial theoretical predictions. We then review the possible types of BHs in nature, from primordial, to stellar-mass, to supermassive BHs. Finally, we focus on the latter category and on their intricate relation with their host galaxies.
openaire   +3 more sources

ASTROPHYSICAL IMPLICATIONS OF THE BINARY BLACK HOLE MERGER GW150914 [PDF]

open access: yesThe Astrophysical Journal Letters, 2016
ABSTRACT The discovery of the gravitational-wave (GW) source GW150914 with the Advanced LIGO detectors provides the first observational evidence for the existence of binary black hole (BH) systems that inspiral and merge within the age of the universe.
Abbott, B. P.   +435 more
openaire   +28 more sources

Observational implications of cosmologically coupled black holes

open access: yesThe Open Journal of Astrophysics, 2023
It was recently suggested that "cosmologically coupled" black holes with masses that increase in proportion to the volume of the Universe might constitute the physical basis of dark energy.
Sohan Ghodla   +3 more
doaj   +1 more source

Shipboard Marine Gravimeters Operated on Vessels in the U.S. Academic Research Fleet: Capabilities and Data Quality

open access: yesGeochemistry, Geophysics, Geosystems, Volume 27, Issue 5, May 2026.
Abstract Shipboard gravity anomaly data provide high‐resolution information for a wide range of Earth and ocean science research as well as ground‐truthing US national geodetic modeling. Motivated by the end of life‐cycle for legacy Bell aerospace marine Gravity Meter system (BGM‐3) gravimeters onboard vessels in the U.S. Academic Research Fleet, a new
Jyun‐Nai Wu   +13 more
wiley   +1 more source

Astrophysical black holes in screened modified gravity [PDF]

open access: yesJournal of Cosmology and Astroparticle Physics, 2014
31 pages, 10 figures, published ...
Davis, Anne-Christine   +3 more
openaire   +3 more sources

Black hole-naked singularity dualism and the repulsion of two Kerr black holes due to spin-spin interaction

open access: yesPhysics Letters B, 2019
We report about the possibility for interacting Kerr sources to exist in two different states – black holes or naked singularities – both states characterized by the same masses and angular momenta.
V.S. Manko, E. Ruiz
doaj   +1 more source

Observational Evidence for Cosmological Coupling of Black Holes and its Implications for an Astrophysical Source of Dark Energy

open access: yesThe Astrophysical Journal Letters, 2023
Observations have found black holes spanning 10 orders of magnitude in mass across most of cosmic history. The Kerr black hole solution is, however, provisional as its behavior at infinity is incompatible with an expanding universe.
Duncan Farrah   +18 more
doaj   +1 more source

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