We perform post-Newtonian analysis of double field theory as a test of string theory in gravitational sector against observations. We identify the Eddington-Robertson-Schiff parameters beta(PPN), gamma(PPN) with the charges of electric H flux and dilaton respectively, and further relate them to stress-energy tensor. We show beta(PPN) = 1 from weak energy condition and argue that the observation of gamma(PPN) similar or equal to 1 signifies the ultrarelativistic equation of state in baryons, or the suppression of gluon condensate.
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Peking Univ, Sch Phys, Beijing 100871, Peoples R China
Peking Univ, State Key Lab Nucl Phys & Technol, Beijing 100871, Peoples R ChinaPeking Univ, Sch Phys, Beijing 100871, Peoples R China
Miao, Xueli
Zhao, Junjie
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Peking Univ, Sch Phys, Beijing 100871, Peoples R China
Peking Univ, State Key Lab Nucl Phys & Technol, Beijing 100871, Peoples R ChinaPeking Univ, Sch Phys, Beijing 100871, Peoples R China
Zhao, Junjie
Shao, Lijing
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Peking Univ, Kavli Inst Astron & Astrophys, Beijing 100871, Peoples R China
Max Planck Inst Radioastron, Hugel 69, D-53121 Bonn, GermanyPeking Univ, Sch Phys, Beijing 100871, Peoples R China
Shao, Lijing
Wex, Norbert
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Max Planck Inst Radioastron, Hugel 69, D-53121 Bonn, GermanyPeking Univ, Sch Phys, Beijing 100871, Peoples R China
Wex, Norbert
Kramer, Michael
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Max Planck Inst Radioastron, Hugel 69, D-53121 Bonn, Germany
Univ Manchester, Jodrell Bank Ctr Astrophys, Oxford Rd, Manchester M13 9PL, Lancs, EnglandPeking Univ, Sch Phys, Beijing 100871, Peoples R China
Kramer, Michael
Ma, Bo-Qiang
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Peking Univ, Sch Phys, Beijing 100871, Peoples R China
Peking Univ, State Key Lab Nucl Phys & Technol, Beijing 100871, Peoples R China
Collaborat Innovat Ctr Quantum Matter, Beijing, Peoples R China
Peking Univ, Ctr High Energy Phys, Beijing 100871, Peoples R ChinaPeking Univ, Sch Phys, Beijing 100871, Peoples R China