Yungui Gong and Anzhong Wang 2006 Class. Quantum Grav. 23 3419 doi:10.1088/0264-9381/23/10/012
Acceleration from M theory and fine-tuning
Yungui Gong1,2 and Anzhong Wang2
Show affiliationsThe compactification of M theory with time-dependent hyperbolic internal space gives an effective scalar field with exponential potential which provides a transient acceleration in the Einstein frame in four dimensions. Ordinary matter and radiation are present in addition to the scalar field coming from compactification. We find that we have to fine-tune the initial conditions of the scalar field so that our universe experiences acceleration now. During the evolution of our universe, the volume of the internal space increases about 12 times. The time variation of the internal space results in a large time variation of the fine structure constant which violates the observational constraint on the variation of the fine structure constant. The large variation of the fine structure constant is a generic feature of transient acceleration models.
- PACS
-
04.50.-h Higher-dimensional gravity and other theories of gravity
- MSC
- Subjects
- Dates
-
Issue 10 (21 May 2006)
Received 17 February 2006
Published 24 April 2006
-
Acceleration from M theory and fine-tuning
Yungui Gong and Anzhong Wang 2006 Class. Quantum Grav. 23 3419
-
Voltage-current characteristics of glass-metal particulate switching systems
G C Das and D Chakravorty 1982 J. Phys. D: Appl. Phys. 15 2255
-
Recent progress in linear scaling ab initio electronic structure techniques
D R Bowler et al 2002 J. Phys.: Condens. Matter 14 2781
-
On the generation of ultra-broad bandwidth light in air at atmospheric pressure
G S McDonald et al 1997 J. Phys. B: At. Mol. Opt. Phys. 30 L719
-
Colouring the rational quantum sphere and the Kochen-Specker theorem
Hans Havlicek et al 2001 J. Phys. A: Math. Gen. 34 3071
-
Progress in functionalization of magnetic nanoparticles for applications in biomedicine
Catherine C Berry 2009 J. Phys. D: Appl. Phys. 42 224003
-
Improvement in electrical properties of hafnium and zirconium silicates by postnitriding
T Ito et al 2006 J. Phys.: Condens. Matter 18 6009
-
Intermediate Wakimoto modules for affine
Ben L Cox and Vyacheslav Futorny 2004 J. Phys. A: Math. Gen. 37 5589
-
Characteristics of electron cyclotron waves creating field-aligned and transverse plasma-potential structures
K Takahashi et al 2009 Plasma Phys. Control. Fusion 51 125007
-
Composing complex EXAFS problems with severe information constraints
B Ravel 2009 J. Phys.: Conf. Ser. 190 012026
Related review articles
What's this?- Loop quantum cosmology: a status report
- Tunnelling methods and Hawking's radiation: achievements and prospects
- Quantitative approaches to information recovery from black holes