# Born again universe

## Abstract

We present a class of nonsingular, bouncing cosmologies that evade singularity theorems through the use of vorticity in compact extra dimensions. The vorticity combats the focusing of geodesics during the contracting phase. The construction requires fluids that violate the null energy condition (NEC) in the compact dimensions, where they can be provided by known stable NEC violating sources such as Casimir energy. The four dimensional effective theory contains an NEC violating fluid of Kaluza-Klein excitations of the higher dimensional metric. Furthermore, these spacetime metrics could potentially allow dynamical relaxation to solve the cosmological constant problem. These ideas can also be used to support traversable Lorentzian wormholes.

- Authors:

- Publication Date:

- Research Org.:
- Stanford Univ., CA (United States)

- Sponsoring Org.:
- USDOE

- OSTI Identifier:
- 1419403

- Alternate Identifier(s):
- OSTI ID: 1501442

- Grant/Contract Number:
- SC0012012

- Resource Type:
- Published Article

- Journal Name:
- Physical Review D

- Additional Journal Information:
- Journal Name: Physical Review D Journal Volume: 97 Journal Issue: 4; Journal ID: ISSN 2470-0010

- Publisher:
- American Physical Society

- Country of Publication:
- United States

- Language:
- English

- Subject:
- 79 ASTRONOMY AND ASTROPHYSICS

### Citation Formats

```
Graham, Peter W., Kaplan, David E., and Rajendran, Surjeet. Born again universe. United States: N. p., 2018.
Web. doi:10.1103/PhysRevD.97.044003.
```

```
Graham, Peter W., Kaplan, David E., & Rajendran, Surjeet. Born again universe. United States. doi:10.1103/PhysRevD.97.044003.
```

```
Graham, Peter W., Kaplan, David E., and Rajendran, Surjeet. Fri .
"Born again universe". United States. doi:10.1103/PhysRevD.97.044003.
```

```
@article{osti_1419403,
```

title = {Born again universe},

author = {Graham, Peter W. and Kaplan, David E. and Rajendran, Surjeet},

abstractNote = {We present a class of nonsingular, bouncing cosmologies that evade singularity theorems through the use of vorticity in compact extra dimensions. The vorticity combats the focusing of geodesics during the contracting phase. The construction requires fluids that violate the null energy condition (NEC) in the compact dimensions, where they can be provided by known stable NEC violating sources such as Casimir energy. The four dimensional effective theory contains an NEC violating fluid of Kaluza-Klein excitations of the higher dimensional metric. Furthermore, these spacetime metrics could potentially allow dynamical relaxation to solve the cosmological constant problem. These ideas can also be used to support traversable Lorentzian wormholes.},

doi = {10.1103/PhysRevD.97.044003},

journal = {Physical Review D},

number = 4,

volume = 97,

place = {United States},

year = {2018},

month = {2}

}

DOI: 10.1103/PhysRevD.97.044003

*Citation information provided by*

Web of Science

Web of Science

#### Figures / Tables:

*G*

^{∞}(

*x*

_{2},

*x*

_{1}) from the perturbations

*O*

_{1},

*O*

_{2}and

*O*

_{3}. There is also a diagram 2.d which is similar to 2.b and 2.c except that it has one sin

*θ*vertex and one cos

*θ*vertex and they are summed in both orders.

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Works referencing / citing this record:

##
Relaxation of the cosmological constant

journal, July 2019

- Graham, Peter W.; Kaplan, David E.; Rajendran, Surjeet
- Physical Review D, Vol. 100, Issue 1

*Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.*