What is dark matter? And how was the structure of the world formed?

Dark matter is still a subject of ongoing debate. It has been considered in the theoretical description of compact objects such as neutron stars with cores of very dense matter. Various candidates for dark matter have been proposed in the scientific literature. Among them, the sexaquark has been identified as a potential boson particle that can form in the neutron star material based on its mass properties. We investigate the viability of the sexquark as a candidate for dark matter, especially under certain density conditions. Addressing the challenges associated with the formation of a boson particle in a highly dense medium without compromising the stability of the neutron star. A direct linear mass change for the sexaquark in the hadronic equation of state. It was observed that including the sexaquark as a dark matter candidate in the hadronic matter equation of state, although it has a repulsive interaction with the baryonic matter, softens the equation of state. We assume that the interaction strength of dark matter with baryonic matter increases linearly with the baryon density. We observe that the increase in the effective mass of the Sexaquark as a result of the increase in its vacuum mass causes the equation of state to become stiffer compared to the constant mass state. We determine lower and upper mass limits for this bosonic dark matter based on observational limits for neutron stars in the DD2Y-T model, when a quark-matter phase-to-phase transition is used. Dark matter, neutron star, equation of state, relativistic mean field, phase transition, sexquark.

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Stam Nicolis added a reply

The particle content of dark matter is, for the moment, unknown.

Sexaquarks, as the name indicates, are composite particles made of six quarks-quarks are among the constituents of ``ordinary'' matter. The reason they don't have anything to do with dark matter is that dark matter is made of other kinds of particles. If it were made of known particles, quarks or leptons, it would have had known interactions with ordinary matter, beyond just gravitational interaction (which is how its presence has been established). It doesn't, however, have strong or electromagnetic interactions with ordinary matter (whether it has, only, weak interactions is, still, a matter of study), so it doesn't carry color or electric charge.

How the ``structure of the world was formed'' is known, after the era in which gravity decoupled from the other interactions, in general terms, though many details are, still, not clear. Cf. for instance: https://workshops.ift.uam-csic.es/uploads/charla/275/Zavala_SM_LCDM.pdf

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Alessandro Rizzo added a reply

1 day ago

Hello,

Dark matter is a substance that makes up about 27% of the universe. We can't see or detect it directly, but we know it's there because of its gravitational effects on visible matter. Scientists think that dark matter played a crucial role in forming galaxies and large-scale structures in the cosmos. It acts like an invisible scaffold, helping to clump regular matter together. Well We're still not sure what dark matter is made of. Some ideas include exotic particles like WIMPs or the sexaquark you mentioned. Researchers are trying to detect dark matter particles in labs and looking for indirect signs of it in space.As for how the world's structure formed, dark matter was undoubtely the key. After the Big Bang, it helped gravity pull matter together to form the first stars and galaxies. Over time, this process built up the complex web of galaxy clusters and filaments we see today. So Dark matter remains one of the biggest puzzles in physics. We're working on understanding it better, but for now, its true nature is still a mystery.

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Javad Fardaei added a reply

3 days ago

Dear Abbas these two articles might answer your questions.

https://www.academia.edu/38670214/The_Theory_of_Everything

Article The Mythos of Gravity Or (Newtonian and Einsteinian Gravity is a Myth)

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Abbas Kashani added a reply

Dear Javad Fardai

From the United States of America

Thank you very much for your kindness, I was very impressed with your articles. Thank you Abbas

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Alessandro Rizzo added a reply

Hello,

Dark matter is a substance that makes up about 27% of the universe. We can't see or detect it directly, but we know it's there because of its gravitational effects on visible matter. Scientists think that dark matter played a crucial role in forming galaxies and large-scale structures in the cosmos. It acts like an invisible scaffold, helping to clump regular matter together. Well We're still not sure what dark matter is made of. Some ideas include exotic particles like WIMPs or the sexaquark you mentioned. Researchers are trying to detect dark matter particles in labs and looking for indirect signs of it in space.As for how the world's structure formed, dark matter was undoubtely the key. After the Big Bang, it helped gravity pull matter together to form the first stars and galaxies. Over time, this process built up the complex web of galaxy clusters and filaments we see today. So Dark matter remains one of the biggest puzzles in physics. We're working on understanding it better, but for now, its true nature is still a mystery.

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Gurcharn Singh Sandhu added a reply

4 hours ago

DARK MATTER

It is fundamentally wrong to assume the existence of fictitious Dark Matter for explaining the pattern of circular velocities of stellar objects in galactic spiral arms.

Let a stellar object of mass m, with circular velocity Vc and radial velocity Vr, be located within a spiral arm at a radial distance R from the galactic centre. Let Mr be the total baryonic mass within a sphere of radius R. Assuming approximate validity of the shell theorem for the galactic disc region and also assuming that the stellar object under consideration is moving solely under the influence of central force field of the galaxy, radial acceleration dVr/dt of the object will be given by,

dVr/dt = -GMr/R2 + Vc2/R

While justifying the necessity of dark matter, the radial acceleration dVr/dt is assumed to be zero and all trajectories of stellar objects are implicitly assumed to be circular, which is wrong. The circular or tangential velocities of stellar bodies are not directly produced by the radial acceleration field of the galaxy but depend on the initial angular momentum of the accreting matter with respect to the gravitating body. Conservation of angular momentum will ensure increase in circular velocity of stellar bodies as their distance from central gravitating body keeps decreasing. Let L be the angular momentum of the stellar object of mass m while entering the outer fringes of the galaxy which will remain constant through out its motion within the central gravitational field. The circular velocity Vc of this object, at any distance from the center of the gravitating mass Mr, will be given by Vc = L/(m.R) and this does not depend upon mass Mr. That is, the increase in circular velocity Vc with decreasing R does not depend on the strength of central gravitation field or magnitude of Mr, but is solely governed by the conservation of angular momentum. Hence it is fundamentally wrong to assume the existence of fictitious Dark Matter for explaining the pattern of circular velocities of stellar objects in spiral arms.

There are other reasons for explaining the flatness of rotation curve but definitely not the assumption of higher mass Mr or Dark Matter. In reality stellar objects in spiral arms do not move solely under the influence of central gravitation field of the galaxy, their motion is also influenced by the local gravitation fields within the spiral arms. There are localized gravitating bodies existing within the spiral arms, which produce their own gravitation field in addition to the gravitational field of the central gravitating body.

Article Ionic Gravitation and Ionized Solid Iron Stellar Bodies

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