Dark energy from primordial inflationary quantum fluctuations.

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Presentation transcript:

Dark energy from primordial inflationary quantum fluctuations. ArXiv:1006.0368[astro-ph.CO] PRL 105, 121301 (2010) Christophe Ringeval (Louvain University) Teruaki Suyama (Research Center for the Early Universe) Tomo Takahashi (Saga University) Masahide Yamaguchi (Tokyo Institute of Technology) Shuichiro Yokoyama (Nagoya University)

The expansion of the universe is accelerating. From wikipedia Cosmological constant Quintessence (introduction of a scalar field) Modification of gravity ….

Quintessence Freezing type Thawing type w w t t Acceleration by the potential energy of the scalar field Freezing type Thawing type w w w=-1 w=-1 t t

The scenario Quantum diffusion : quintessence field During primordial inflation, the coarse grained field undergoes random walk. Quantum diffusion

The scenario Gaussian distribution : quintessence field During primordial inflation, the coarse grained field undergoes random walk. Gaussian distribution The field takes this typical value in our observable universe.

The scenario is completely fixed. (no free parameters) The potential energy Only depends on We require that this potential energy is responsible for the current accelerated expansion: (1) (2) is completely fixed. (no free parameters)

The scenario To summarize, Energy scale of the primordial inflation To summarize, If there is a light scalar field such that , and if the primordial inflation has occurred at TeV scale, then the field drives the current accelerated expansion.

Some consequences (1) Reheating temperature (2) Tensor-to-scalar ratio (3) Eternal inflation The number of e-fold required to reach the Bunch-Davies distribution This can be realized in the eternal inflation.

Observational constraints Parameters that are varied. Basic equations Observations Type Ia supernovae (R.Amanullah et al., ApJ. 716, 712 (2010)) Baryon acoustic oscillations (W.J.Percival et al., MNRAS, 401, 2148, (2010)) Acoustic peak of the CMB power spectrum (arXiv:1001.4538)

Observational constraints well fits with

Energy scale of inflation

Energy scale of inflation

Summary We proposed new dark energy scenario that has a link with the primordial inflation. The current acceleration of the universe is due to the quantum fluctuation of the scalar field generated during the primordial inflation. In this scenario, the energy scale of the primordial inflation is predicted to be around TeV scale. Negligile tensor to scalar ratio. Reheating temperature less than TeV. Eternal inflation is one possible model.