Gravity's rainbow (microwave anisotropy and gravitational waves)

G. F. Smoot, P. J. Steinhardt

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


Could COBE DMR be detecting the imprint from a spectrum of gravitational waves generated during inflation? The conventional inflationary prediction had been that the cosmic microwave anisotropy is dominated by energy density fluctuations generated during inflation and that the gravitational waves contribute negligibly. The authors report on recent work that has shown that the conventional wisdom may be wrong; specifically, gravitational waves may dominate the anisotropy in inflationary models where the spectrum of perturbations deviates significantly from scale invariance (e.g., extended and power-law inflation models and extreme versions of chaotic inflation). If gravitational waves do dominate at the large-angular scales measured by COBE DMR, the expectation and interpretation of anisotropies on small-angular scales is profoundly altered.

Original languageEnglish (US)
Article number002
Pages (from-to)S19-S32
JournalClassical and Quantum Gravity
Issue numberS
StatePublished - 1993

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)


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