Gravitational particle production of scalars: analytic and numerical approaches including early reheating
Abstract Cosmological gravitational particle production (GPP) is a generic mechanism by which particles are produced during the inflationary epoch. In this work we consider the GPP of massive scalars in an effort to fully understand the spectrum of the produced particles. We consider scalars which a...
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| Format: | Article |
| Language: | English |
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SpringerOpen
2025-05-01
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| Series: | Journal of High Energy Physics |
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| Online Access: | https://doi.org/10.1007/JHEP05(2025)077 |
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| author | Leah Jenks Edward W. Kolb Keyer Thyme |
| author_facet | Leah Jenks Edward W. Kolb Keyer Thyme |
| author_sort | Leah Jenks |
| collection | DOAJ |
| description | Abstract Cosmological gravitational particle production (GPP) is a generic mechanism by which particles are produced during the inflationary epoch. In this work we consider the GPP of massive scalars in an effort to fully understand the spectrum of the produced particles. We consider scalars which are conformally or minimally coupled to gravity, as well as models of both early and late reheating. We numerically calculate the particle production in each scenario and compare the results to analytic approximations from boundary matching, Stokes phenomenon, steepest descent, and inflaton scattering methods. For each method, we describe the regime of validity and show that there is good agreement between the analytic and numerical results. |
| format | Article |
| id | doaj-art-4a078d3aca0a4c8799f4e3445dd86adf |
| institution | Kabale University |
| issn | 1029-8479 |
| language | English |
| publishDate | 2025-05-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Journal of High Energy Physics |
| spelling | doaj-art-4a078d3aca0a4c8799f4e3445dd86adf2025-08-20T03:25:15ZengSpringerOpenJournal of High Energy Physics1029-84792025-05-012025514610.1007/JHEP05(2025)077Gravitational particle production of scalars: analytic and numerical approaches including early reheatingLeah Jenks0Edward W. Kolb1Keyer Thyme2Kavli Institute for Cosmological Physics, The University of ChicagoKavli Institute for Cosmological Physics, The University of ChicagoKavli Institute for Cosmological Physics, The University of ChicagoAbstract Cosmological gravitational particle production (GPP) is a generic mechanism by which particles are produced during the inflationary epoch. In this work we consider the GPP of massive scalars in an effort to fully understand the spectrum of the produced particles. We consider scalars which are conformally or minimally coupled to gravity, as well as models of both early and late reheating. We numerically calculate the particle production in each scenario and compare the results to analytic approximations from boundary matching, Stokes phenomenon, steepest descent, and inflaton scattering methods. For each method, we describe the regime of validity and show that there is good agreement between the analytic and numerical results.https://doi.org/10.1007/JHEP05(2025)077Early Universe Particle PhysicsParticle Nature of Dark Matter |
| spellingShingle | Leah Jenks Edward W. Kolb Keyer Thyme Gravitational particle production of scalars: analytic and numerical approaches including early reheating Journal of High Energy Physics Early Universe Particle Physics Particle Nature of Dark Matter |
| title | Gravitational particle production of scalars: analytic and numerical approaches including early reheating |
| title_full | Gravitational particle production of scalars: analytic and numerical approaches including early reheating |
| title_fullStr | Gravitational particle production of scalars: analytic and numerical approaches including early reheating |
| title_full_unstemmed | Gravitational particle production of scalars: analytic and numerical approaches including early reheating |
| title_short | Gravitational particle production of scalars: analytic and numerical approaches including early reheating |
| title_sort | gravitational particle production of scalars analytic and numerical approaches including early reheating |
| topic | Early Universe Particle Physics Particle Nature of Dark Matter |
| url | https://doi.org/10.1007/JHEP05(2025)077 |
| work_keys_str_mv | AT leahjenks gravitationalparticleproductionofscalarsanalyticandnumericalapproachesincludingearlyreheating AT edwardwkolb gravitationalparticleproductionofscalarsanalyticandnumericalapproachesincludingearlyreheating AT keyerthyme gravitationalparticleproductionofscalarsanalyticandnumericalapproachesincludingearlyreheating |