Observational constraints on patch inflation in noncommutative spacetime
| dc.creator | Calcagni, Gianluca | |
| dc.creator | Tsujikawa, Shinji | |
| dc.date | 2004-07-27 | |
| dc.date | 2004-11-09 | |
| dc.date.accessioned | 2026-07-07T02:14:07Z | |
| dc.date.available | 2026-07-07T02:14:07Z | |
| dc.description | We study constraints on a number of patch inflationary models in noncommutative spacetime using a compilation of recent high-precision observational data. In particular, the four-dimensional General Relativistic (GR) case, the Randall-Sundrum (RS) and Gauss-Bonnet (GB) braneworld scenarios are investigated by extending previous commutative analyses to the infrared limit of a maximally symmetric realization of the stringy uncertainty principle. The effect of spacetime noncommutativity modifies the standard consistency relation between the tensor spectral index and the tensor-to-scalar ratio. We perform likelihood analyses in terms of inflationary observables using new consistency relations and confront them with large-field inflationary models with potential V \propto \vp^p in two classes of noncommutative scenarios. We find a number of interesting results: (i) the quartic potential (p=4) is rescued from marginal rejection in the class 2 GR case, and (ii) steep inflation driven by an exponential potential (p \to \infty) is allowed in the class 1 RS case. Spacetime noncommutativity can lead to blue-tilted scalar and tensor spectra even for monomial potentials, thus opening up a possibility to explain the loss of power observed in the cosmic microwave background anisotropies. We also explore patch inflation with a Dirac-Born-Infeld tachyon field and explicitly show that the associated likelihood analysis is equivalent to the one in the ordinary scalar field case by using horizon-flow parameters. It turns out that tachyon inflation is compatible with observations in all patch cosmologies even for large p. | |
| dc.description | 16 pages, 11 figures; v2: updated references, minor corrections to match the Phys. Rev. D version | |
| dc.identifier | https://arxiv.org/abs/astro-ph/0407543 | |
| dc.identifier | http://arxiv.org/abs/astro-ph/0407543 | |
| dc.identifier | Phys.Rev. D70 (2004) 103514 | |
| dc.identifier | doi:10.1103/PhysRevD.70.103514 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/7995 | |
| dc.subject | Astrophysics | |
| dc.subject | General Relativity and Quantum Cosmology | |
| dc.subject | High Energy Physics - Phenomenology | |
| dc.subject | High Energy Physics - Theory | |
| dc.title | Observational constraints on patch inflation in noncommutative spacetime | |
| dc.type | text |