35 citations · 151 across the 17 of their papers we have counts for
10 papers · 1 filter
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…
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…
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"…
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…
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…