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http://hdl.handle.net/2289/6208| Title: | Torsional instanton effects in quantum gravity |
| Authors: | Kaul, Romesh K. Sengupta, Sandipan |
| Issue Date: | 29-Dec-2014 |
| Publisher: | American Physical Society |
| Citation: | Physical Review D, 2014, Vol. 90, p124081 |
| Abstract: | We show that in the first-order gravity theory coupled to axions the instanton number of the Giddings-Strominger wormhole can be interpreted as the Nieh-Yan topological index. The axion charge of the baby universes is quantized in terms of the Nieh-Yan integers. Tunneling between universes of different Nieh-Yan charges implies a nonperturbative vacuum state. The associated topological vacuum angle can be identified with the Barbero-Immirzi parameter. |
| Description: | Open Access |
| URI: | http://hdl.handle.net/2289/6208 |
| ISSN: | 1550-7998 1550-2368(Online) |
| Alternative Location: | http://arxiv.org/abs/1411.4793 http://dx.doi.org/10.1103/PhysRevD.90.124081 http://adsabs.harvard.edu/abs/2014PhRvD..90l4081K |
| Copyright: | 2014 American Physical society |
| Appears in Collections: | Research Papers (TP) |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| 2014_PhysRevD_90_124081.pdf | Open Access | 161.96 kB | Adobe PDF | View/Open |
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