Signs and stability in higher-derivative gravity
文献类型：期刊论文
| 作者 | Narain, G |
| 刊名 | INTERNATIONAL JOURNAL OF MODERN PHYSICS A
 |
| 出版日期 | 2018 |
| 卷号 | 33期号:4页码:1850031 |
| 关键词 | ONE-LOOP DIVERGENCES QUANTUM-FIELD THEORY EINSTEIN GRAVITY ASYMPTOTIC FREEDOM CURVED SPACETIME WEYL GRAVITY RENORMALIZATION NONRENORMALIZABILITY UNITARITY CONSTANTS |
| ISSN号 | 0217-751X |
| DOI | 10.1142/S0217751X18500318 |
| 英文摘要 | Perturbatively renormalizable higher-derivative gravity in four space-time dimensions with arbitrary signs of couplings has been considered. Systematic analysis of the action with arbitrary signs of couplings in lorentzian flat space-time for no-tachyons, fixes the signs. Feynman +i epsilon prescription for these sign further grants necessary convergence in path-integral, suppressing the field modes with large action. This also leads to a sensible wick rotation where quantum computation can be performed. Running couplings for these sign of parameters makes the massive tensor ghost innocuous leading to a stable and ghost-free renormalizable theory in four space-time dimensions. The theory has a transition point arising from renormalisation group (RG) equations, where the coefficient of R-2 diverges without affecting the perturbative quantum field theory. Redefining this coefficient gives a better handle over the theory around the transition point. The flow equations pushes the flow of parameters across the transition point. The flow beyond the transition point is analysed using the one-loop RG equations which shows that the regime beyond the transition point has unphysical properties: there are tachyons, the path-integral loses positive definiteness, Newton's constant G becomes negative and large, and perturbative parameters become large. These shortcomings indicate a lack of completeness beyond the transition point and need of a non-perturbative treatment of the theory beyond the transition point. |
| 学科主题 | Physics |
| 语种 | 英语 |
| 源URL | [http://ir.itp.ac.cn/handle/311006/22957]  |
| 专题 | 理论物理研究所_理论物理所1978-2010年知识产出 |
| 作者单位 | Chinese Acad Sci, ITP, Key Lab CAS Theoret Phys, Beijing 100190, Peoples R China |
| 推荐引用方式 GB/T 7714 | Narain, G. Signs and stability in higher-derivative gravity[J]. INTERNATIONAL JOURNAL OF MODERN PHYSICS A,2018,33(4):1850031. |
| APA | Narain, G.(2018).Signs and stability in higher-derivative gravity.INTERNATIONAL JOURNAL OF MODERN PHYSICS A,33(4),1850031. |
| MLA | Narain, G."Signs and stability in higher-derivative gravity".INTERNATIONAL JOURNAL OF MODERN PHYSICS A 33.4(2018):1850031. |
入库方式： OAI收割
来源：理论物理研究所
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