143 citations · 880 across the 47 of their papers we have counts for
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Unitarity Problems for an Effective Field Theory Description of Early Universe Cosmology
Robert Brandenberger, Vahid Kamali
In the context of Effective Field Theory, the Hilbert space of states increases in an expanding universe. Hence, the time evolution cannot be unitary. The formation of structure is…
Thermal, Trapped and Chromo-Natural Inflation in light of the Swampland Criteria and the Trans-Planckian Censorship Conjecture
Arjun Berera, Robert Brandenberger, Vahid Kamali +1
We consider thermal, trapped and chromo-natural inflation in light of the swampland criteria and the Trans-Planckian Censorship Conjecture (TCC). Since thermal inflation occurs at…
Creating Spatial Flatness by Combining String Gas Cosmology and Power Law Inflation
Vahid Kamali, Robert Brandenberger
We show that it is possible to combine an early phase of String Gas Cosmology which can explain the origin of the observed structures on cosmological scales with a short later peri…
Strengthening the de Sitter swampland conjecture in warm inflation
Robert Brandenberger, Vahid Kamali, Rudnei O. Ramos
The "de Sitter constraint" on the space of effective scalar field theories consistent with superstring theory provides a lower bound on the slope of the potential of a scalar field…
Relaxing the TCC Bound on Inflationary Cosmology?
Vahid Kamali, Robert Brandenberger
We demonstrate that the strict upper bounds on the energy scale of inflation and on the tensor-to-scalar ratio can be somewhat relaxed if we assume that - after an initial period o…
Tachyon Warm-Logamediate Inflationary Universe Model in High Dissipative Regime
M. R. Setare, V. Kamali
In the present work, we study warm tachyon inflation model in the context of "logamediate inflation" where the cosmological scale factor expands as . The cha…