HET Seminar | A New Solution to the Gravitino Problem: Suppressed Production by Sgoldstino Dynamics
Raymond Co (UM)
In supersymmetric theories, the gravitino is copiously produced by the scattering of the thermal particles at the end of inflationary reheating. The gravitino is overproduced unless the reheat temperature is sufficiently low, which is incompatible with thermal leptogenesis. This is known as the gravitino problem. In models of low scale mediation, the field value of the sgoldstino determines the mediation scale. We point out that the sgoldstino field value can be different in the early Universe than the present one. In particular, a large initial field value since the era of the inflationary reheating suppresses the gravitino production significantly and removes the gravitino problem. We rigorously analyze the cosmological evolution of the sgoldstino and show that the reheat temperature may well exceed the conventional upper bound, restoring the compatibility with thermal leptogenesis.
Building: | West Hall |
---|---|
Event Type: | Workshop / Seminar |
Tags: | Free, Graduate Students, Lecture, Physics, Science, Undergraduate Students |
Source: | Happening @ Michigan from HET Seminars, Department of Physics |
Events
Featured
Oct
08
2025 Ta-You Wu Lecture in Physics | Einstein, Gravitational Waves, Black Holes and Other Matters
Gabriela González, Boyd Professor of Physics (Louisiana State University)
4:00 PM
Fourth Floor Ampitheatre
Rackham Graduate School (Horace H.)
Upcoming
Sep
11
Quantum Research Institute | TBD
TBD
11:00 AM
2000PML
Virtual
Sep
25
Mohammad Hafezi (University of Maryland)
TBD
11:00 AM
411
Virtual
Oct
09
Quantum Research Institute | TBD
Jeff Thompson (Princeton University)
11:00 AM
2000PML
Virtual