Zobrazeno 1 - 10
of 535
pro vyhledávání: '"Klinkhamer, F. R."'
Autor:
Klinkhamer, F. R.
We present a 5D metric which interpolates between the standard 4D Schwarzschild metric with mass parameter $M$ and a new 4D $M$-deformed vacuum-defect-wormhole metric. The 5D spacetime can, in principle, have an infinite mass density that gives rise
Externí odkaz:
http://arxiv.org/abs/2307.12876
Autor:
Klinkhamer, F. R.
Publikováno v:
Acta Phys. Pol. B 54, 7-A3 (2023)
We have recently discovered a smooth vacuum-wormhole solution of the first-order equations of general relativity. Here, we obtain the corresponding multiple-vacuum-wormhole solution. Assuming that our world is essentially Minkowski spacetime with a l
Externí odkaz:
http://arxiv.org/abs/2305.13278
Autor:
Klinkhamer, F. R.
Publikováno v:
Acta Phys. Polon. B 54, 5-A3 (2023)
We present a traversable-wormhole solution of the gravitational field equation of General Relativity without need of exotic matter (exotic matter can, for example, have negative energy density and vanishing isotropic pressure). Instead of exotic matt
Externí odkaz:
http://arxiv.org/abs/2301.00724
Autor:
Klinkhamer, F. R.
Publikováno v:
Class. Quant. Grav. 40 (2023) 124001
We review a cosmological model where the metric determinant plays a dynamical role and present new numerical results on the cancellation of the vacuum energy density including the contribution of a cosmological constant. The action of this model is o
Externí odkaz:
http://arxiv.org/abs/2212.00709
Autor:
Klinkhamer, F. R.
Publikováno v:
LHEP 2022 (2022) 312
A 4D-brane realization of $q$-theory has been proposed a few years ago. The present paper studies the corresponding late-time cosmology and establishes the dynamic cancellation of an initial cosmological constant and an attractor behavior towards Min
Externí odkaz:
http://arxiv.org/abs/2207.03453
Autor:
Klinkhamer, F. R.
Publikováno v:
Phys. Rev. D 106, 124015 (2022)
A new way is proposed to cancel the cosmological constant. The proposal involves the metric determinant acting as a type of self-adjusting $q$-field without need of a fine-tuned chemical potential. Since the determinant of the metric now plays a role
Externí odkaz:
http://arxiv.org/abs/2207.02826
Autor:
Klinkhamer, F. R.
Publikováno v:
PoS (CORFU2021) 259
The IIB matrix model has been suggested as a particular formulation of nonperturbative superstring theory (M-theory). It has now been realized that an emerging classical spacetime may reside in its large-$N$ master field. This bosonic master field ca
Externí odkaz:
http://arxiv.org/abs/2203.15779
Autor:
Klinkhamer, F. R., Volovik, G. E.
Publikováno v:
Phys. Rev. D 105, 084066 (2022)
It has been argued that a particular type of quantum-vacuum variable $q$ can provide a solution to the main cosmological constant problem and possibly also give a cold-dark-matter component. We now show that the same $q$-field may suggest a new inter
Externí odkaz:
http://arxiv.org/abs/2111.07962
Autor:
Klinkhamer, F. R.
Publikováno v:
Acta Phys. Pol. B 53, 1-A5 (2022)
A direct algebraic solution has been obtained from the full bosonic master-field equation of the IIB matrix model for low dimensionality $D=3$ and small matrix size $N=3$. A different method is needed for larger values of $D$ and $N$. Here, we explor
Externí odkaz:
http://arxiv.org/abs/2110.15309
Autor:
Klinkhamer, F. R.
Publikováno v:
Acta Phys. Pol. B 52, 1339 (2021)
It has been argued that the bosonic large-$N$ master field of the IIB matrix model can give rise to an emergent classical spacetime. In a recent paper, we have obtained solutions of a simplified bosonic master-field equation from a related matrix mod
Externí odkaz:
http://arxiv.org/abs/2106.07632