• fluid of negative mass

    From Jacob Navia@21:1/5 to All on Sun Nov 28 12:19:54 2021
    [[Mod. note -- Lines rewrapped -- jt]]

    arXiv:1712.07962v2 [physics.gen-ph] 26 Oct 2018
    ABSTRACT
    Dark energy and dark matter constitute 95% of the observable Universe.
    Yet the physical nature of these two phenomena remains a mystery.
    Einstein suggested a long-forgotten solution: gravitationally
    repulsive negative masses, which drive cosmic expansion and cannot
    coalesce into light-emitting structures. However, contemporary
    cosmological results are derived upon the reasonable assumption
    that the Universe only contains positive masses. By reconsidering
    this assumption, I have constructed a toy model which suggests that
    both dark phenomena can be unified into a single negative mass
    fluid. The model is a modified Lambda-CDM cosmology, and indicates
    that continuously-created negative masses can resemble the cosmological
    constant and can flatten the rotation curves of galaxies. The model
    leads to a cyclic universe with a time-variable Hubble parameter,
    potentially providing compatibility with the current tension that
    is emerging in cosmological measurements. In the first three-dimensional
    N-body simulations of negative mass matter in the scientific
    literature, this exotic material naturally forms haloes around
    galaxies that extend to several galactic radii. These haloes are
    not cuspy. The proposed cosmological model is therefore able to
    predict the observed distribution of dark matter in galaxies from
    first principles. The model makes several testable predictions and
    seems to have the potential to be consistent with observational
    evidence from distant supernovae, the cosmic microwave background,
    and galaxy clusters. These findings may imply that negative masses
    are a real and physical aspect of our Universe, or alternatively
    may imply the existence of a superseding theory that in some limit
    can be modelled by effective negative masses. Both cases lead to the
    surprising conclusion that the compelling puzzle of the dark Universe
    may have been due to a simple sign error.

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  • From Phillip Helbig (undress to reply@21:1/5 to Jacob Navia on Mon Nov 29 11:20:14 2021
    In article <9d1f6a5a-c853-4577-a251-0ac24668a38en@googlegroups.com>, Jacob Navia <jacobnavia7@gmail.com> writes:
    [[Mod. note -- Lines rewrapped -- jt]]

    arXiv:1712.07962v2 [physics.gen-ph] 26 Oct 2018
    ABSTRACT
    Dark energy and dark matter constitute 95% of the observable Universe.
    Yet the physical nature of these two phenomena remains a mystery.
    Einstein suggested a long-forgotten solution: gravitationally
    repulsive negative masses, which drive cosmic expansion and cannot
    coalesce into light-emitting structures. However, contemporary
    cosmological results are derived upon the reasonable assumption
    that the Universe only contains positive masses. By reconsidering
    this assumption, I have constructed a toy model which suggests that
    both dark phenomena can be unified into a single negative mass
    fluid. The model is a modified Lambda-CDM cosmology, and indicates
    that continuously-created negative masses can resemble the cosmological
    constant and can flatten the rotation curves of galaxies. The model
    leads to a cyclic universe with a time-variable Hubble parameter,
    potentially providing compatibility with the current tension that
    is emerging in cosmological measurements. In the first three-dimensional
    N-body simulations of negative mass matter in the scientific
    literature, this exotic material naturally forms haloes around
    galaxies that extend to several galactic radii. These haloes are
    not cuspy. The proposed cosmological model is therefore able to
    predict the observed distribution of dark matter in galaxies from
    first principles. The model makes several testable predictions and
    seems to have the potential to be consistent with observational
    evidence from distant supernovae, the cosmic microwave background,
    and galaxy clusters. These findings may imply that negative masses
    are a real and physical aspect of our Universe, or alternatively
    may imply the existence of a superseding theory that in some limit
    can be modelled by effective negative masses. Both cases lead to the
    surprising conclusion that the compelling puzzle of the dark Universe
    may have been due to a simple sign error.

    There is a good summary here:

    http://backreaction.blogspot.com/2018/12/no-negative-masses-have-not.html

    (As usual, the comments can be hit and miss.)

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  • From Phillip Helbig (undress to reply@21:1/5 to b Navia on Mon Nov 29 11:19:59 2021
    In article <9d1f6a5a-c853-4577-a251-0ac24668a38en@googlegroups.com>, Jaco=
    b Navia <jacobnavia7@gmail.com> writes:
    [[Mod. note -- Lines rewrapped -- jt]]
    =20
    arXiv:1712.07962v2 [physics.gen-ph] 26 Oct 2018
    ABSTRACT
    Dark energy and dark matter constitute 95% of the observable Universe=
    .
    Yet the physical nature of these two phenomena remains a mystery.
    Einstein suggested a long-forgotten solution: gravitationally
    repulsive negative masses, which drive cosmic expansion and cannot
    coalesce into light-emitting structures. However, contemporary
    cosmological results are derived upon the reasonable assumption
    that the Universe only contains positive masses. By reconsidering
    this assumption, I have constructed a toy model which suggests that
    both dark phenomena can be unified into a single negative mass
    fluid. The model is a modified Lambda-CDM cosmology, and indicates
    that continuously-created negative masses can resemble the cosmologic=
    al
    constant and can flatten the rotation curves of galaxies. The model
    leads to a cyclic universe with a time-variable Hubble parameter,
    potentially providing compatibility with the current tension that
    is emerging in cosmological measurements. In the first three-dimensio=
    nal
    N-body simulations of negative mass matter in the scientific
    literature, this exotic material naturally forms haloes around
    galaxies that extend to several galactic radii. These haloes are
    not cuspy. The proposed cosmological model is therefore able to
    predict the observed distribution of dark matter in galaxies from
    first principles. The model makes several testable predictions and
    seems to have the potential to be consistent with observational
    evidence from distant supernovae, the cosmic microwave background,
    and galaxy clusters. These findings may imply that negative masses
    are a real and physical aspect of our Universe, or alternatively
    may imply the existence of a superseding theory that in some limit
    can be modelled by effective negative masses. Both cases lead to the
    surprising conclusion that the compelling puzzle of the dark Universe
    may have been due to a simple sign error.

    There was much discussion when that came out a few years ago. Suffice=20
    it to say that he has convinced practically no-one and many people have=20 pointed out deficiencies in the idea.

    Although arXiv is certainly not always right, in many cases astrophysics=20 papers are in the gen-ph rather than astro-ph category if arXiv thinks=20
    that they are not very good. Now arXiv is not always right, and their=20 decisions in such cases are very obscure, but look at what is in gen-ph=20
    and compare it to astro-ph and draw your own conclusions.

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