Condensate of massive graviton and dark matter

Aoki, Katsuki; Maeda, Kei Ichi

doi:10.1103/physrevd.97.044002

Cited by 38 publications

(47 citation statements)

References 85 publications

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“…One possibility to be a consistent scenario is introducing the hierarchy of the mass scales M G 10 8 M pl (α 1/2 10 −8 ). Another possibility is introducing the Z 2 symmetry of the massive graviton [27]; the theory is symmetric under ϕ µν → −ϕ µν . The symmetry leads to M G = M pl and the matter fields are coupled with the metric [53]…”

Section: Summary and Discussionmentioning

confidence: 99%

Massive graviton geons

et al. 2018

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We find vacuum solutions such that massive gravitons are confined in a local spacetime region by their gravitational energy in asymptotically flat spacetimes in the context of the bigravity theory. We call such self-gravitating objects massive graviton geons. The basic equations can be reduced to the Schrödinger-Poisson equations with the tensor "wavefunction" in the Newtonian limit. We obtain a non-spherically symmetric solution with j = 2, ℓ = 0 as well as a spherically symmetric solution with j = 0, ℓ = 2 in this system where j is the total angular momentum quantum number and ℓ is the orbital angular momentum quantum number, respectively. The energy eigenvalue of the Schrödinger equation in the non-spherical solution is smaller than that in the spherical solution. We then study the perturbative stability of the spherical solution and find that there is an unstable mode in the quadrupole mode perturbations which may be interpreted as the transition mode to the non-spherical solution. The results suggest that the non-spherically symmetric solution is the ground state of the massive graviton geon. The massive graviton geons may decay in time due to emissions of gravitational waves but this timescale can be quite long when the massive gravitons are non-relativistic and then the geons can be long-lived. We also argue possible prospects of the massive graviton geons: applications to the ultralight dark matter scenario, nonlinear (in)stability of the Minkowski spacetime, and a quantum transition of the spacetime.

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confidence: 99%

Massive graviton geons

et al. 2018

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“…where a dot is the derivative with respect to t. As shown in [16,25], the small anisotropies σ g and σ f can be a dark matter component of the universe in the bimetric model without the chameleon field φ. We generalize their calculations to those in the present model (2.1).…”

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confidence: 91%

Massive graviton dark matter with environment dependent mass: A natural explanation of the dark matter-baryon ratio

Aoki

Mukohyama

2017

Phys. Rev. D

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We propose a scenario that can naturally explain the observed dark matter-baryon ratio in the context of bimetric theory with a chameleon field. We introduce two additional gravitational degrees of freedom, the massive graviton and the chameleon field, corresponding to dark matter and dark energy, respectively. The chameleon field is assumed to be non-minimally coupled to dark matter, i.e., the massive graviton, through the graviton mass terms. We find that the dark matter-baryon ratio is dynamically adjusted to the observed value due to the energy transfer by the chameleon field. As a result, the model can explain the observed dark matter-baryon ratio independently from the initial abundance of them.

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“…The traditional fields that follow this pattern are axion-like particles and dilatons [1][2][3][4][5][6][7]. However, with these same assumptions, nearly the same late Universe cosmological evolution and phenomenology can be obtained from a massive vector or spin-2 tensor field, as shown respectively in [8][9][10][11][12][13][14] and [15,16] 2 . Such different models also come equipped with a variety of possible interactions with the SM fields.…”

Section: Introductionmentioning

confidence: 99%

Binary pulsars as probes for spin-2 ultralight dark matter

Armaleo

Nacir

Urban

2020

J. Cosmol. Astropart. Phys.

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Binary pulsars can be excellent probes of ultra-light dark matter. We consider the scenario where the latter is represented by a spin-2 field. The coherent oscillations of the dark matter field perturb the dynamics of binary systems, leading to secular effects for masses that resonate with the binary systems. For the range 10 −23 eV m 10 −17 eV we show that current timing data could potentially constrain the universal coupling strength of dark matter to ordinary matter at the level of α 10 −5 . :1909.13814v1 [astro-ph.HE] arXiv

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Condensate of massive graviton and dark matter

Cited by 38 publications

References 85 publications

Massive graviton geons

Massive graviton geons

Massive graviton dark matter with environment dependent mass: A natural explanation of the dark matter-baryon ratio

Binary pulsars as probes for spin-2 ultralight dark matter

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