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Conditions for defocusing around more general metrics in infinite derivative gravity

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Conditions for defocusing around more general metrics in infinite derivative gravity. / Edholm, James.
In: Physical Review D, Vol. 97, No. 8, 084046, 26.04.2018.

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Edholm J. Conditions for defocusing around more general metrics in infinite derivative gravity. Physical Review D. 2018 Apr 26;97(8):084046. doi: 10.1103/PhysRevD.97.084046

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Bibtex

@article{2cc6879c3b904379a9b1ed0d9bbd6536,
title = "Conditions for defocusing around more general metrics in infinite derivative gravity",
abstract = "Infinite derivative gravity is able to resolve the big bang curvature singularity present in general relativity by using a simplifying ansatz. We show that it can also avoid the Hawking-Penrose singularity, by allowing defocusing of null rays through the Raychaudhuri equation. This occurs not only in the minimal case where we ignore the matter contribution but also in the case where matter plays a key role. We investigate the conditions for defocusing for the general case where this ansatz applies and also for more specific metrics, including a general Friedmann-Robertson-Walker metric and three specific choices of the scale factor which produce a bouncing Friedmann-Robertson-Walker universe.",
author = "James Edholm",
note = "{\textcopyright} 2018 American Physical Society",
year = "2018",
month = apr,
day = "26",
doi = "10.1103/PhysRevD.97.084046",
language = "English",
volume = "97",
journal = "Physical Review D",
issn = "1550-7998",
publisher = "American Physical Society",
number = "8",

}

RIS

TY - JOUR

T1 - Conditions for defocusing around more general metrics in infinite derivative gravity

AU - Edholm, James

N1 - © 2018 American Physical Society

PY - 2018/4/26

Y1 - 2018/4/26

N2 - Infinite derivative gravity is able to resolve the big bang curvature singularity present in general relativity by using a simplifying ansatz. We show that it can also avoid the Hawking-Penrose singularity, by allowing defocusing of null rays through the Raychaudhuri equation. This occurs not only in the minimal case where we ignore the matter contribution but also in the case where matter plays a key role. We investigate the conditions for defocusing for the general case where this ansatz applies and also for more specific metrics, including a general Friedmann-Robertson-Walker metric and three specific choices of the scale factor which produce a bouncing Friedmann-Robertson-Walker universe.

AB - Infinite derivative gravity is able to resolve the big bang curvature singularity present in general relativity by using a simplifying ansatz. We show that it can also avoid the Hawking-Penrose singularity, by allowing defocusing of null rays through the Raychaudhuri equation. This occurs not only in the minimal case where we ignore the matter contribution but also in the case where matter plays a key role. We investigate the conditions for defocusing for the general case where this ansatz applies and also for more specific metrics, including a general Friedmann-Robertson-Walker metric and three specific choices of the scale factor which produce a bouncing Friedmann-Robertson-Walker universe.

U2 - 10.1103/PhysRevD.97.084046

DO - 10.1103/PhysRevD.97.084046

M3 - Journal article

VL - 97

JO - Physical Review D

JF - Physical Review D

SN - 1550-7998

IS - 8

M1 - 084046

ER -