Astrophysics

2603 Submissions

[4] viXra:2603.0125 [pdf] submitted on 2026-03-25 23:59:34

Accretion Delay in Massive Star Formation

Authors: Jan Makopa
Comments: 11 Pages.

It is bona-fide knowledge that, radiative feedback from the core of a pre-main sequence (PMS) star leads to a global accretion delay in stellar formation. How long the accretion delay lasts, remains poorly constrained in existing numerical and analytical model. This problem is more common in massive star formation where the global accretion delay leads to modulated accretion rates which effectively traps massive stars in a pre-ignition bottleneck, where they exhaust their energy supply before achieving stable nuclear fusion. Numerical tools capable of this task are lacking at present. We consider the present investigation an important step in this direction. Here we show that, in a radiative pressure-dominated regime, an unprecedented radiative contraction delay $t_{text{RD}}$, must exceed the Kelvin-Helmholtz timescale ($t_{text{KH}}$). This uncertainty poses a major stumbling block in our current understanding of stellar evolution.
Category: Astrophysics

[3] viXra:2603.0088 [pdf] submitted on 2026-03-17 00:30:54

Shaking up Newton's Theory[:] The Anomalous Velocity of Comet Oumuamua

Authors: Henk Dorrestijn
Comments: 13 Pages. hjdorrestijn@gmail.com

In this article, we focus on a new interpretation of gravity. This view sees gravitational acceleration around a mass as a response to the disruption of spatial symmetry caused by the obstructive effect of the mass on the propagation of radiation. Newton's gravity formula requires some modification, but the key change is that gravity is not directed at the center of gravity of the mass at its actual location, but at the location where the moving mass was located when the radiation making the mass visible passed by. We call this interpretation the obstruction theory. This new theory is successfully applied in this article to calculate the anomalous velocity of the interstellar comet Oumuamua.
Category: Astrophysics

[2] viXra:2603.0056 [pdf] submitted on 2026-03-10 17:28:48

Dark Matter - Is it Needed?

Authors: Hartmut Schwab
Comments: 15 Pages.

The idea that the outer stars of a galaxy resp. the outer galaxies of a cluster of galaxies are rotating too fast around their gravitational centres and therefore can not be kept on their orbits by the gravitation of the baryonic matter leads to the assumption of extra matter, the u201edark matter", whose gravitation is suited to keep the outer stars/galaxies on their orbits.It is demonstrated that if the gravitational acceleration as a function of the distance from the gravitational centre is determined correctly, the observed orbital velocities can be explained solely by the baryonic matter and Newton’s laws and therefore u201edark matter" is not needed. It is not even necessary To explain the other effects ascribed to it, u201edark matter" is not neeeded either as the higher gravitational accelerations necessary for these effects are delivered solely by the baryonic matter.
Category: Astrophysics

[1] viXra:2603.0037 [pdf] submitted on 2026-03-06 21:37:28

A Further Specification of the Cosmological Constant Problem by Account the Two Fermions in the Standard Model and an Effect of the Reducing of Vacuum by Matter Based on Uncertainty Relations

Authors: Nekrasov Grigory Yu
Comments: 90 Pages.

A Cosmological constant problem has been considered in the light of the Standard model ofelementary particles (SM) by account two fundamental fermions in the SM, i.e. the u quark and the electron and their antiparticles. All the movings of these virtual pairs and their orientations in space have been taken into account in the offered model of vacuum. This led to the more precise and accurate estimation of vacuum energy of the Universe on the discovered and examined minimal scale ~1.5×10^-15 m on uncertainty relations, than in the previous work. Comparison of this estimation with the calculation realized by the method and the model used in the previous work was carried out. The current calculation is the full computation, i.e. for the full scale range, which begins from 1.5×10^-15 m and can think terminated for the effect on the maximal linear size2.00008×10^-11 m for the experimental data and the theoretical data on hydrogen and heliumatoms correspondingly. These atoms are considered due to that they are the most common in the entire Universe. Thus, one can say that the vacuum energy near matter in the special effect of the reducing of vacuum by matter has been assessed more precisely as it is in the real world.
Category: Astrophysics