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Gravitational Potential and Nonrelativistic Lagrangian in Modified Gravity with Varying G
Dimitris M. Christodoulou, Demosthenes Kazanas
We have recently shown that the baryonic Tully-Fisher (BTF) and Faber-Jackson (BFJ) relations imply that the gravitational "constant" in the force law vary with acceleration $a…
A no-hair theorem for spherically symmetric black holes in gravity
Joseph Sultana, Demosthenes Kazanas
In a recent paper Cañate (CQG, {\bf 35}, 025018 (2018)) proved a no hair theorem to static and spherically symmetric or stationary axisymmetric black holes in general gravit…
Accretion Disk MHD Winds and Blazar Classification
Stella Boula, Demosthenes Kazanas, Apostolos Mastichiadis
The Fermi Gamma-Ray Space Telescope observations of blazars show a strong correlation between the spectral index of their gamma-ray spectra and their synchrotron peak frequency $ν_…
Binary black hole growth by gas accretion in stellar clusters
Zacharias Roupas, Demosthenes Kazanas
We show that binaries of stellar-mass black holes formed inside a young protoglobular cluster, can grow rapidly inside the cluster's core by accretion of the intracluster gas, befo…
Variable Nature of Magnetically-Driven Ultra-Fast Outflows
Keigo Fukumura, Demosthenes Kazanas, Chris Shrader +3
Among a number of active galactic nuclei (AGNs) that drive ionized outflows in X-rays, a low-redshift (z = 0.184) quasar, PDS 456, is long known to exhibit one of the exemplary ult…
Interposing a Varying Gravitational Constant Between Modified Newtonian Dynamics and Weak Weyl Gravity
Dimitris M. Christodoulou, Demosthenes Kazanas
The Newtonian gravitational constant obeys the dimensional relation , where , , and denote mass, acceleration, and speed, respectively. Since the…