Prof.
Alexander Zakharov
(leading researcher)
03/10/2017, 15:45
Now there are two basic observational techniques to investigate a
gravitational potential at the Galactic Center, namely, a)
monitoring the orbits of bright stars near the Galactic Center to
reconstruct a gravitational potential; b) measuring a size and a
shape of shadows around black hole giving an alternative possibility
to evaluate black hole parameters in mm-band with VLBI-technique....
Dragan Hajdukovic
(Institute of Physics, Astrophysics and Cosmology)
03/10/2017, 16:00
We present the consequences of the working hypothesis that quantum vacuum fluctuations are virtual gravitational dipoles, what might be, if for instance, particles and antiparticles have the gravitational charge of the opposite sign. The hypothesis of virtual gravitational dipoles permits to consider the Standard Model matter (i.e. matter composed from quarks and leptons interacting through...
Dr.
Tatyana Shestakova
(Department of Theoretical and Computational Physics, Southern Federal University)
03/10/2017, 16:15
The Wheeler – DeWitt equation was proposed 50 years ago and until now it is a cornerstone of most approaches to quantization of gravity. One can find in the literature the opinion that the Wheeler – DeWitt equation is even more fundamental than the basic equation of quantum theory, the Schrödinger equation [1]. We still should remember that we are in the situation when no observational data...
Prof.
Nikolai Gromov
(Institute of Physics and Mathematics, Komi Science Center UrD RAS)
03/10/2017, 16:30
The high-temperature limit of Standard Model generated by the contractions of gauge group $SU(2)$ of Electroweak Model and gauge group $SU(3)$ of Quantum Chromodynamics is discussed.
Contraction parameters of both gauge groups are taken identical and tending to zero when temperature increase.
Properties of the elementary particlies change drastically at the infinite temperature: all...
Dr.
Maxim Dvornikov
(Institute of Terrestrial Magnetism, Ionosphere and Radiowave Propagation (IZMIRAN))
03/10/2017, 16:45
We study the evolution of cosmological and astrophysical magnetic fields driven by the chiral magnetic effect and accounting for the turbulence of background matter. We start with the consideration of the physics concepts underlying the proposed model, such as the chiral magnetic effect (including the case when the electroweak interaction with background matter is present), the relativistic...
Mr.
Kumar Das
(Senior Research Fellow)
03/10/2017, 17:00
We made a systematic study of supergravity contributions relevant for inflationary models in Jordan frame supergravity. In a special class of Jordan frame, the scalar potential separates into a tree-level term and a supergravity contribution term, which is potentially dangerous for sustaining inflation. If during inflation the vacuum energy is mainly due to the F-term of an auxiliary...
Prof.
Vladimir Belokurov
(Lomonosov Moscow State University and Institute for Nuclear Research of RAS)
03/10/2017, 17:15
We evaluate the quantum averaged potential of the scalar field minimaly coupled to gravity
and solve the Riccati equation for the Hubble parameter that follows from the Einstein equations.
Alexander Isayev
(Kharkov Institute of Physics and Technology)
03/10/2017, 17:30
Spherically symmetric relativistic stars with the polytropic equation of state, which possess the local pressure anisotropy, are considered in the context of general relativity. The generalized Lane-Emden equations are derived for the arbitrary anisotropy parameter. They are then applied to some special ansatz for the anisotropy parameter in the form of the differential relation between the...
Ms.
Liudmila Fesik
(Saint Petersburg State University)
03/10/2017, 17:45
There is presented a new method for the determination of a polarization state of an incoming gravitational wave (GW) by means of interferometric antennas when the source localisation is known. Modern gravitational theories predict the existence of several polarization states of gravitational waves including scalar and tensor modes. The method is based on the analysis of antennas beam patterns...
Dr.
Victor Semikoz
(IZMIRAN)
03/10/2017, 18:00
The neutrino asymmetry can be generated due to the Berry curvature
in the momentum space that modifies the known Boltzmann equations
for neutrinos and antineutrinos interacting with plasma in Standard Model
both before and after electroweak phase transition in early Universe.
If magnetic fields are unstable due to neutrino
asymmetry one can put a lower bound on that asymmetry in...
