A Study on the Effect of Reheating Energy Scale on CMB

  • Inflation plays a significant role in interpreting current observations. Despite the success of inflation theory, the reheating energy scale ρreh is largely uncertain today. This consequently induces uncertainty to the primordial spectrum when achieving primordial spectra from inflation models. In this paper, we study the effects of this uncertainty on the primordial spectrum and cosmic microwave background (CMB) radiation. For the primordial spectra with small running indices, our result shows that the effect is negligible if the inflation parameter V0 can be normalized freely. But for models with large running indices, we find that ρreh can be highly restricted by the CMB observations.
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  • [1] . Lyth D H ,Riotto A .Phys.Rept.,1999,314:1—1462. FENG Bo,GONG Xiao-Bo,WANG Xiu-Lian.astro-ph/03011113. Lyth D H ,Stewart E D .Phys.Rev.,1996,D53:1784—17984. Bunn E ,Liddle A ,White M .Phys.Rev.,1996,D54:5917—59215. Lyth D H ,Covi L .Phys.Rev.,2000,D62:103504(1—13)6. Bunn E ,White M .Astrophys.J .,1997,480:6—21 7. WANG X ,Tegmark M ,Zaldarriaga M .Phys.Rev.,2002,D65:123001(1—14)8. White M et al.Astrophys.J.,1993,418:535—5619. Zalsarriaga M ,Seljak U .Phys.Rev.,1997,D55:1830—1840 10. Kamionkowski M ,Kosowsky A ,Stebbins A .Phys.Rev.,1997,D55:7368—738811. Tegmark M ,Zaldarriaga M .astro-ph/0207047 12. Lesgourgues J ,Polarski D ,Starobinsky A A .Mon.Not.R .Astron.Soc.,1998,297:769—776;Barandela F A et al.Astrophys.J.,2001,559:1—1013. Griffiths L M ,Silk J,Zaroubi S .astro-ph/001057114. Kamionkowski M ,Liddle A R .Phys.Rev.Lett.,2000,84:4525—4528;Zentner A R ,Bullock J S .astro-ph/020521615. Starobinsky A A .JETP .Lett.,1992,55:489—49416. WANG X ,Feng B ,LI M .astro-ph/020924217. Sarkar S .Rep.Prog.Phys.,1996,59:1493—150818. Moroi T ,Takahashi T .Phys.Lett.,2001,B503:376—38819. Chung D J H et al.Phys.Rev.,2000,D62:043508(1—19)20. Burgess C P et al.hep-th/021023321. Seljak U ,Zaldarriaga M .Astrophys.J .,1996,469:http: //cmbfast.org
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GONG Xiao-Bo, FENG Bo and WANG Xiu-Lian. A Study on the Effect of Reheating Energy Scale on CMB[J]. Chinese Physics C, 2003, 27(12): 1074-1078.
GONG Xiao-Bo, FENG Bo and WANG Xiu-Lian. A Study on the Effect of Reheating Energy Scale on CMB[J]. Chinese Physics C, 2003, 27(12): 1074-1078. shu
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Received: 2003-05-09
Revised: 1900-01-01
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A Study on the Effect of Reheating Energy Scale on CMB

    Corresponding author: WANG Xiu-Lian,
  • Department of Physics,Peking University,Beijing 100871,China2 Institute of High Energy Physics,CAS,Beijing 100039,China

Abstract: Inflation plays a significant role in interpreting current observations. Despite the success of inflation theory, the reheating energy scale ρreh is largely uncertain today. This consequently induces uncertainty to the primordial spectrum when achieving primordial spectra from inflation models. In this paper, we study the effects of this uncertainty on the primordial spectrum and cosmic microwave background (CMB) radiation. For the primordial spectra with small running indices, our result shows that the effect is negligible if the inflation parameter V0 can be normalized freely. But for models with large running indices, we find that ρreh can be highly restricted by the CMB observations.

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