Screening the Cosmological Constant in non-local gravity - INSPIRE

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Screening the Cosmological Constant in non-local gravity

2012

4 pages

Part of Proceedings, 21st Workshop on General Relativity and Gravitation in Japan (JGRG21) : Sendai, Japan, September 26-29, 2011, 270-273

Contribution to:

- JGRG21
, 270-273

Published: 2012

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Abstract: (Grobid)

In this paper, we consider a class of model of non-local gravity with a largebare cosmological constant, Λ, and study its cosmological solutions. In theabsence of matter, we find a power-law expanding universe solution a ∝ t n withn < 1, that is, a universe with decelarated expansion without any fine-tuning ofthe parameter. So the effect of the cosmological constant is effectivelyscreened in this solution. Also it is found that the solution is ghost-free fora very wide range of parameters. Thus our solution opens up new possibilitiesfor solution to the cosmological constant problem.

References(6)

Figures(0)

[1]

Nonlocal Cosmology

Stanley Deser
(
- Caltech and
- Brandeis U.
)
,
R.P. Woodard
(
- Florida U.
)

- Phys.Rev.Lett. 99 (2007) 111301
•
e-Print:
- 0706.2151
•
DOI:
- 10.1103/PhysRevLett.99.111301

[2]

Nonlocal modification of gravity and the cosmological constant problem

Nima Arkani-Hamed
(
- Harvard U., Phys. Dept.
)
,
Savas Dimopoulos
(
- Stanford U., Phys. Dept.
)
,
Gia Dvali
(
- New York U.
)
,
Gregory Gabadadze
(
- CERN
)

e-Print:
- hep-th/0209227

[3]

Screening of cosmological constant in non-local gravity

Shin'ichi Nojiri
(
- Nagoya U. and
- KMI, Nagoya
)
,
Sergei D. Odintsov
(
- ICREA, Barcelona and
- ICE, Bellaterra
)
,
Misao Sasaki
(
- Kyoto U., Yukawa Inst., Kyoto and
- Korea Inst. Advanced Study, Seoul
)
,
Ying-li Zhang
(
- Kyoto U., Yukawa Inst., Kyoto
)

- Phys.Lett.B 696 (2011) 278-282
•
e-Print:
- 1010.5375
•
DOI:
- 10.1016/j.physletb.2010.12.035

[4]

Screening of cosmological constant for De Sitter Universe in non-local gravity, phantom-divide crossing and finite-time future singularities

Kazuharu Bamba
(
- KMI, Nagoya
)
,
Shinichi Nojiri
(
- KMI, Nagoya and
- Nagoya U.
)
,
Sergei D. Odintsov
(
- ICREA, Barcelona and
- ICE, Bellaterra and
- Tomsk Pedagogical Inst.
)
,
Misao Sasaki
(
- Kyoto U., Yukawa Inst., Kyoto and
- Korea Inst. Advanced Study, Seoul
)

- Gen.Rel.Grav. 44 (2012) 1321-1356
•
e-Print:
- 1104.2692
•
DOI:
- 10.1007/s10714-012-1342-7

[5]

Screening of cosmological constant in non-local cosmology

- Int.J.Mod.Phys.D 21 (2012) 1250006
•
e-Print:
- 1108.2112
•
DOI:
- 10.1142/S021827181250006X

[6]

Dynamics of Nonlocal Cosmology

Tomi Koivisto
(
- Heidelberg U.
)

- Phys.Rev.D 77 (2008) 123513
•
e-Print:
- 0803.3399
•
DOI:
- 10.1103/PhysRevD.77.123513