期刊
PHYSICAL REVIEW LETTERS
卷 102, 期 19, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.102.191302
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资金
- Ministry of Education, Science and Culture of Japan [18540262, 17340075]
- STFC [ST/G000433/1] Funding Source: UKRI
- Grants-in-Aid for Scientific Research [18540262, 17340075] Funding Source: KAKEN
- Science and Technology Facilities Council [ST/G000433/1] Funding Source: researchfish
We study an inflationary scenario with a vector field coupled with an inflaton field and show that the inflationary Universe is endowed with anisotropy for a wide range of coupling functions. This anisotropic inflation is a tracking solution where the energy density of the vector field follows that of the inflaton field irrespective of initial conditions. We find a universal relation between the anisotropy and a slow-roll parameter of inflation. Our finding has observational implications and gives a counterexample to the cosmic no-hair conjecture.
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