Global portraits of inflation in nonsingular variables
Abstract In the phase space perspective, scalar field slow roll inflation is described by a heteroclinic orbit from a saddle type fixed point to a final attractive point. In many models the saddle point resides in the scalar field asymptotics, and thus for a comprehensive view of the dynamics a glob...
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| Format: | Article |
| Language: | English |
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SpringerOpen
2025-06-01
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| Series: | European Physical Journal C: Particles and Fields |
| Online Access: | https://doi.org/10.1140/epjc/s10052-025-14411-7 |
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| author | Laur Järv Dmitri Kraiko |
| author_facet | Laur Järv Dmitri Kraiko |
| author_sort | Laur Järv |
| collection | DOAJ |
| description | Abstract In the phase space perspective, scalar field slow roll inflation is described by a heteroclinic orbit from a saddle type fixed point to a final attractive point. In many models the saddle point resides in the scalar field asymptotics, and thus for a comprehensive view of the dynamics a global phase portrait is necessary. For this task, in the literature one mostly encounters dynamical variables that either render the initial or the final state singular, thus obscuring the full picture. In this work we construct a hybrid set of variables which allow the depiction of both the initial and final states distinctly in nonsingular manner. To illustrate the method, we apply these variables to portray various interesting types of scalar field inflationary models like metric Higgs inflation, metric Starobinsky inflation, pole inflation, and a nonminimal Palatini model. |
| format | Article |
| id | doaj-art-79278b8efa1f464a8b847c3fe72f07a5 |
| institution | Kabale University |
| issn | 1434-6052 |
| language | English |
| publishDate | 2025-06-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | European Physical Journal C: Particles and Fields |
| spelling | doaj-art-79278b8efa1f464a8b847c3fe72f07a52025-08-20T03:37:40ZengSpringerOpenEuropean Physical Journal C: Particles and Fields1434-60522025-06-0185612210.1140/epjc/s10052-025-14411-7Global portraits of inflation in nonsingular variablesLaur Järv0Dmitri Kraiko1Institute of Physics, University of TartuInstitute of Physics, University of TartuAbstract In the phase space perspective, scalar field slow roll inflation is described by a heteroclinic orbit from a saddle type fixed point to a final attractive point. In many models the saddle point resides in the scalar field asymptotics, and thus for a comprehensive view of the dynamics a global phase portrait is necessary. For this task, in the literature one mostly encounters dynamical variables that either render the initial or the final state singular, thus obscuring the full picture. In this work we construct a hybrid set of variables which allow the depiction of both the initial and final states distinctly in nonsingular manner. To illustrate the method, we apply these variables to portray various interesting types of scalar field inflationary models like metric Higgs inflation, metric Starobinsky inflation, pole inflation, and a nonminimal Palatini model.https://doi.org/10.1140/epjc/s10052-025-14411-7 |
| spellingShingle | Laur Järv Dmitri Kraiko Global portraits of inflation in nonsingular variables European Physical Journal C: Particles and Fields |
| title | Global portraits of inflation in nonsingular variables |
| title_full | Global portraits of inflation in nonsingular variables |
| title_fullStr | Global portraits of inflation in nonsingular variables |
| title_full_unstemmed | Global portraits of inflation in nonsingular variables |
| title_short | Global portraits of inflation in nonsingular variables |
| title_sort | global portraits of inflation in nonsingular variables |
| url | https://doi.org/10.1140/epjc/s10052-025-14411-7 |
| work_keys_str_mv | AT laurjarv globalportraitsofinflationinnonsingularvariables AT dmitrikraiko globalportraitsofinflationinnonsingularvariables |