Regular instantons in the Eddington-inspired-Born-Infeld gravity: Lorentzian wormholes from bubble nucleations

Journal Article · 28 October 2018 · Journal of Cosmology and Astroparticle Physics

DOI: https://doi.org/10.1088/1475-7516/2018/10/056 · OSTI ID:1490416

Bouhmadi-López, Mariam ^[1]; Chen, Che-Yu ^[2]; Chen, Pisin ^[3]; Yeom, Dong-han ^[4]

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1. Univ. of the Basque Country (UPV/EHU), Bilbao (Spain). Dept. of Theoretical Physics; Basque Foundation for Science (Ikerbasque), Bilbao (Spain)
2. National Taiwan Univ., Taipei (Taiwan). Dept. of Physics. Center for Theoretical Sciences. Leung Center for Cosmology and Particle Astrophysics (LeCosPA)
3. National Taiwan Univ., Taipei (Taiwan). Dept. of Physics. Center for Theoretical Sciences. Leung Center for Cosmology and Particle Astrophysics (LeCosPA); SLAC National Accelerator Lab., Menlo Park, CA (United States). Kavli Inst. for Particle Astrophysics and Cosmology
4. Asia Pacific Center for Theoretical Physics, Pohang (Korea, Republic of); Pohang Univ. of Science and Technology (POSTECH) (Korea, Republic of). Dept. of Physics

The O(4)-symmetric regular instanton solutions are studied within the framework of the Eddington-inspired-Born-Infeld gravity (EiBI). Here we find that the behavior of the solution would deviate from that in Einstein gravity when the kinetic energy of the scalar field is sufficiently large. The tunneling probability is calculated numerically in different parameter space. We find that the tunneling probability would increase with the Born-Infeld coupling constant, which is assumed to be positive in this paper. Furthermore, we discover a neck feature in the physical instanton solutions when the kinetic energy of the scalar field is sufficiently large. This feature can be interpreted as a Lorentzian time-like wormhole geometry formed during the bubble materialization.

• Research Organization: Asia Pacific Center for Theoretical Physics, Pohang (Korea, Republic of); Basque Foundation for Science (Ikerbasque), Bilbao (Spain); National Taiwan Univ., Taipei (Taiwan); Pohang Univ. of Science and Technology (POSTECH) (Korea, Republic of); SLAC National Accelerator Lab., Menlo Park, CA (United States); Univ. of the Basque Country (UPV/EHU), Bilbao (Spain)
• Sponsoring Organization: Basque Foundation for Science (Ikerbasque) (Spain); Basque Government (Spain); European Regional Development Fund (ERDF); Ministry of Economy and Business (MINECO) (Spain); Ministry of Education, Science, and Technology (Korea, Republic of); National Research Foundation of Korea (NRF); Taiwan National Science Council; USDOE
• Grant/Contract Number: AC02-76SF00515
• OSTI ID: 1490416
• Journal Information: Journal of Cosmology and Astroparticle Physics, Journal Name: Journal of Cosmology and Astroparticle Physics Journal Issue: 10 Vol. 2018; ISSN 1475-7516
• Publisher: Institute of Physics (IOP)Copyright Statement
• Country of Publication: United States
• Language: English