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Cosmological Wormhole Model

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Cosmological Wormhole Model Cosmological model with wormhole and cosmological horizons Sung-Won Kim (Ewha Womans University, Korea) arXiv: 1801.07989 Motivation • Cosmological black hole – More practical solution, especially for expanding universe – Several solution for black hole embedded in expanding universe – Unification of global and local physics • Cosmological wormhole – Exotic matter for wormhole – Wormhole can be generated in the very early universe and expands to macroscopic scale. – Wormhole can have a role in early universe or expansion of the universe – We need exact solution satisfying Einstein Field Eq. – What is happening in the universe with wormhole? GC2018 / Yukawa / January 29 - March 9, 2 2018 Models • Black Hole Cosmology – Kottler (1918): SdS – McVittie (1933): black ole in FLRW – Sultana-Dyer (2005): conformal transform of Schwarzschild – Faraoni-Jacques (2007): generalized McVittie • Wormhole Cosmology – Hochberg, Kepart (1993): two copies of FLRW & paste – Roman (1993): wormhole in inflation – SWK (1996): wormhole in FLRW – Mirza, Eshaghi, Dehdashti (2006): wormhole in FLRW GC2018 / Yukawa / January 29 - March 9, 3 2018 Isotropic Wormhole solution 1 • Morris-Thorne type wormhole • Isotropic form of the solution • Before the detailed form of 푏(푟) is not known, it is very hard to understand the spacetime structure GC2018 / Yukawa / January 29 - March 9, 4 2018 Isotropic Wormhole solution 2 푏 2 • 퐴 = 1, 푏 = 0 (푟 > 푏 ) For simple case, 푟 0 GC2018 / Yukawa / January 29 - March 9, 5 2018 Isotropic Wormhole solution 3 Matter solutions Negative energy density GC2018 / Yukawa / January 29 - March 9, 6 2018 Wormhole solution embedded in FLRW universe 1 • Isotropic form of FRLW universe • Let’s start from the metric form for wormhole in FRLW universe • Assume the matter distribution as GC2018 / Yukawa / January 29 - March 9, 7 2018 Wormhole solution embedded in FLRW universe 2 • Einstein field equation Scale factor • Exact solution is GC2018 / Yukawa / January 29 - March 9, 8 2018 Wormhole solution embedded in FLRW universe 3 • Solution for spatial part – Boundary conditions Matter distribution – Inhomogeneous differential equation 9 Wormhole solution embedded in FLRW universe 4 • Final metric • Discussions – General solution (from wormhole to cosmological wormhole) – General solution (from FLRW to cosmological wormhole) 푎(푡) 푎(푡) → 푋(푡, 푟) 푘푟2+1 2 푘푟2+1 2 1 푏2 – Coupling term & Interaction: ←→ 0 (1+푘푟2)2 4푟2 – We can return to the original form with Inverse transformation GC2018 / Yukawa / January 29 - March 9, 10 2018 Apparent horizons 1 • With new coordinate ∆ GC2018 / Yukawa / January 29 - March 9, 11 2018 Apparent horizons 2 • Case 1: b(t)<RH/2 Two horizons • Case 2: b(t)=RH/2 1 horizon • Case 1: b(t)>RH/2 0 horizon GC2018 / Yukawa / January 29 - March 9, 12 2018 Hawking temperature 2 • Radial null geodesic GC2018 / Yukawa / January 29 - March 9, 13 2018 Apparent horizons 3 • 푘 = 0, 푅0 < 푅− < 푅+ < 푅퐻 Misner-Sharp-Hermandez mass: GC2018 / Yukawa / January 29 - March 9, 14 2018 Hawking Temperature 1 • Kodama vector • Hamilton-Jacobi equation GC2018 / Yukawa / January 29 - March 9, 15 2018 Summary & future work • Exact solution of wormhole embedded in FRLW universe – Isotropic form of MT wormhole is found. – It satisfies Einstein’s equation. – Coupling term and no interaction of global & local structure. • Apparent horizons are found. – Two horizons – cosmological horizon, wormhole trapping horizon (wormhole throat size) < Hubble horizon • Hawking temperature is calculated. GC2018 / Yukawa / January 29 - March 9, 16 2018.
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