35 citations · 151 across the 17 of their papers we have counts for
18 papers
The exponential metric: traversable wormhole and possible identification of scalar background
Eduard Mychelkin, Gulnara Suliyeva, Maxim Makukov
The static antiscalar solution of the Einstein-Klein-Gordon equations in the form of the Papapetrou exponential metric had been interpreted as a traversable wormhole with a throat…
On the weak and strong field effects in antiscalar background
Eduard Mychelkin, Maxim Makukov, Gulnara Suliyeva +1
The triumph of general relativity under the banner "gravity is geometry" began with confirming the crucial effects within the Solar system and proceeded recently to the strong-fiel…
Milky Way globular clusters on cosmological timescales. I. Evolution of the orbital parameters in time-varying potentials
M. Ishchenko, M. Sobolenko, P. Berczik +4
Context. Recent observational data show that the Milky Way (MW) galaxy contains about 170 globular clusters (GCs). A fraction of them is likely formed in dwarf galaxies accreted on…
Rotation in vacuum and scalar background: are there alternatives to Newman-Janis algorithm?
Maxim Makukov, Eduard Mychelkin
The Newman-Janis algorithm is the standard approach to rotation in general relativity which, in vacuum, builds the Kerr metric from the Schwarzschild spacetime. Recently, we have s…
Intermediate-mass ratio inspirals in merging elliptical galaxies
Verónica Vázquez-Aceves, Pau Amaro Seoane, Dana Kuvatova +3
Close encounters between two initially unbound objects can result in a binary system if enough energy is released as gravitational waves (GWs). We address the scenario in which suc…
Triple path to the exponential metric
Maxim Makukov, Eduard Mychelkin
The exponential Papapetrou metric induced by scalar field conforms to observational data not worse than the vacuum Schwarzschild solution. Here, we analyze the origin of this metri…
The scalarized Raychaudhuri identity and its applications
Eduard G. Mychelkin, Maxim A. Makukov
We show that the covariant Raychaudhuri identity describing kinematic characteristics of space-time admits a representation involving a geometrical scalar which, depending on c…
Simpler than vacuum: Antiscalar alternatives to black holes
Maxim Makukov, Eduard Mychelkin
The Janis-Newman-Winicour and Papapetrou metrics represent counterparts to the Schwarzschild black hole with scalar and antiscalar background fields, correspondingly (where "anti"…
SETI in vivo: testing the we-are-them hypothesis
Maxim A. Makukov, Vladimir I. shCherbak
After it was proposed that life on Earth might descend from seeding by an earlier civilization, some authors noted that this alternative offers a testable aspect: the seeds could b…
Unified geometrical basis for the generalized Ehlers identities and Raychaudhuri equations
Eduard G. Mychelkin, Maxim A. Makukov
It is shown that the timelike, spacelike and null versions of the Ehlers identity, as well as ensuing Raychaudhuri equations, might be all derived within a single geometrical appro…
Coordinate effect: Vaidya solutions without integrating the field equations
Eduard G. Mychelkin, Maxim A. Makukov
We extend Vaidya's algorithm for the description of a central mass losing or gaining energy due to electromagnetic-type radiation (`null dust') to the case of arbitrary radial corp…
On possible tachyonic state of neutrino dark matter
Maxim A. Makukov, Eduard G. Mychelkin, Vladimir L. Saveliev
We revive the historically first dark matter model based on neutrinos, but with an additional assumption that neutrinos might exist in tachyonic almost sterile states. To this end,…
Tachyonic approach to neutrino dark matter
Eduard G. Mychelkin, Maxim A. Makukov
We apply a new approach based on three relativistic groups (bradyon, tachyon and instanton) forming the `Lorentz groupoid' which allows, in particular, to consider tachyons without…
Antiscalar cosmological background
Eduard G. Mychelkin, Maxim A. Makukov
It is shown that the antiscalar approach to dark energy, whereby the energy-momentum tensor of the scalar field has the sign opposite to that of the rest of the matter, follows fro…
Fundamental scalar fields and the dark side of the universe
Eduard G. Mychelkin, Maxim A. Makukov
Starting with geometrical premises, we infer the existence of fundamental cosmological scalar fields. We then consider physically relevant situations in which spacetime metric is i…
Space ethics to test directed panspermia
Maxim A. Makukov, Vladimir I. shCherbak
The hypothesis that Earth was intentionally seeded with life by a preceding extraterrestrial civilization is believed to be currently untestable. However, analysis of the situation…
The "Wow! signal" of the terrestrial genetic code
Vladimir I. shCherbak, Maxim A. Makukov
It has been repeatedly proposed to expand the scope for SETI, and one of the suggested alternatives to radio is the biological media. Genomic DNA is already used on Earth to store…
Enhanced accretion rates of stars on Super-massive Black Holes by star-disk interactions in galactic nuclei
Andreas Just, Denis Yurin, Maxim Makukov +4
We investigate the dynamical interaction of a central star cluster surrounding a super-massive black hole and a central accretion disk. The dissipative force acting on stars in the…