We will address the existence of a new symmetry for an imperfect
fluid by introducing local four-velocity gauge-like transformations for the case when there is vorticity^1. A similar tetrad formulation as to the Einstein-Maxwell spacetimes formalism presented in previous manuscripts^2,3 will be developed in this manuscript for the imperfect fluids. The four-velocity curl and the metric...
The densest structures of the Universe formed at the knots of the cosmic
web at high redshifts and constitute the present-day clusters of galaxies. The
early stages of these structures are called protoclusters. In this work, we use the
submm source J1000+0234, representative of a population of dusty and distant
starburst galaxies expected to inhabit peaks of matter density, as a target for...
The formalism of the Kinetic Theory of Relativistic Gases provides a geometrical framework to obtain the distribution function of the matter components. Such distribution function possesses the symmetries of the space-time in which it is embedded. In this talk we present the distribution function for a matter component in a Friedmann-Robertson-Walker (FRW) universe. Once the more general...
When simulating relativistic gas flows, complex flows are often formed in zones that are much smaller than the entire calculation domain. The processes that take place outside such zones may greatly affect not only the behavior but also the formation of the complex flows. The use of adaptive mesh refinement technique is a universal method of domain discretization in computing such multi-scale...
In this work, we employ coupling constants derived from non-perturbative QCD Sum Rules in conjunction with the relativistic mean field (RMF) framework to construct the equation of state (EoS) for beta-stable baryonic matter. Utilizing this EoS, we systematically investigate the structure of hyperonic and hybrid stars, including the Hyperon-Quark phase transition , modeled via conventional...
We perform a Bayesian analysis of the equation of state (EOS) constraints using recent observational data, including pulsar masses, radii, and tidal deformabilities. Our focus is on a class of hybrid neutron star EOS that incorporates color superconducting quark matter, based on a recently developed nonlocal chiral quark model. The nuclear matter phase is described using a relativistic density...
Spherical collapse in general relativity has been studied with different methods, especially by using a priori given equations of state that describe the collapsing matter as a perfect fluid. We propose an alternative perspective, in which the initial density of the perfect fluid is given as a polynomial function of the radial coordinate that is regular everywhere inside the fluid. We then...
In the following work, a new hybrid model of the
form $ f(Q) = Q(1 + a) + b\frac{Q^2}{Q_0} $
has been proposed and confronted using both early as well as late-time constraints. We
first use conditions from the era of Big Bang Nucleosynthesis
(BBN) in order to constrain the models which are further used
to study the evolution of the Universe through the deceleration parameter. This...
Yes, the symmetric teleparallel framework brings about the possibility of alleviating cosmological tensions. The current burning issue in cosmological studies is the increase in discrepancies in measurements from several surveys. Here, we have focused on $H_0$ and $S_8$ tensions, which are important factors in describing the evolution of the Universe from primordial perturbation to late-time...
According to theoretical estimates, our Galaxy contains about 100 million black holes, a large majority of which should be isolated. Yet, not a single isolated black hole had ever been unambiguously detected. After a brief review of the subject, the powerful technique of astrometric microlensing to detect isolated stellar mass black holes will be described. We used this novel technique of...
This study explored the behavior of the $f(T, \mathcal{T})$ cosmological model with the use of various data set combinations. We also compared the results for this model between the Pantheon+ (without SH0ES) and the Pantheon+\&SH0ES (with SH0ES) data sets. Additionally, we incorporated data from BAO along with $H_0$ priors. We observed that integrating SH0ES data points leads to a higher...
We investigate the mass-radius relationship of magnetized color-flavor locked (MCFL) spheroidal strange quark stars within the framework of the $\gamma$-metric formalism. The CFL phase, a superconducting state of quark matter, is characterized by the pairing of quarks of different colors and flavors, leading to a significant energy gap and increased stability. The Equation of State (EoS) of...
Igor Chernykh, Igor Kulikov, Vitaly Vshivkov, Ivan Chernoshtanov, Marina Boronina
Particle-in-cell (PIC) numerical simulations are widely used for the numerical modeling of plasma physics problems. These simulations are used primarily, but not exclusively, to study the kinetic behavior of the particles. For example, we used this method for numerical simulations of physics in linear particle...
Considering our 4G model of final unification, we have noticed a simple relation for Planck length in terms of nuclear physical constants. It’s published version can be expressed as, $\sqrt{\frac{G_N \hbar}{c^3}}\cong \left ( \frac{m_p^2}{\left ( m_n-m_p \right )m_e} \right )\left ( \frac{2 \pi R_0^2}{3ct_n} \right )\cong \left ( \frac{m_p^2}{\left ( m_n-m_p \right )m_e} \right ) \left (...
The Inkas worshipped the Sun, and their emperor was thought to be the son of the Sun. They conquered most of the Andes and their former empire is replete with examples of their astronomy. They used solar positions on the horizon for calendrical purposes and managed their crops and religious festivals in this fashion. Many examples remain of their intentional light and shadow effects that...
Black holes are among the most extraordinary and intriguing objects in the Universe. Within the framework of General Relativity, one of the most well-established modern physical theories, the study of these objects can be carried out using the simplest solution, known as the Schwarzschild metric. This solution describes a static and spherically symmetric black hole, enabling the analysis of...
With our corrected cosmic red shift formula and Hubble-Hawking model of cosmology [1], we have developed a direct relation for fitting the accelerating model of luminosity distances (LD) [2-6] having $H_0\cong 2.92\times 10^{-19}\left(2.725\right)^2\cong 66.9 \textrm{ km/sec/Mpc}$. If $z_{new}\cong \frac{E_{emitted}-E_{Observed}}{E_{emitted}}\cong \frac{\lambda_{Observed}-\lambda_{emitted}}...
With our corrected cosmic red shift formula and Hubble-Hawking model of cosmology, we have developed direct relations for fitting the adot and Hubble parameter. Hubble-Hawking model of current Hubble parameter can be expressed as, $\left ( H_{0} \right )_{HH} \cong 2.92 \times 10^{-19} \left ( 2.725 \right )^2\cong 66.9 \textrm{ km/sec/Mpc}$. If $z_{new}\cong...
The intrinsic spin of fermions can generate torsion in spacetime. This gives rise to an effective four-fermion interaction that fermions experience within a fermionic distribution. This interaction is expected to become significant when densities become large, such as in early-universe cosmology or in compact astrophysical objects like neutron stars. In this contribution, I will discuss the...
