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      Inflation and Preheating in NO models

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          Abstract

          We study inflationary models in which the effective potential of the inflaton field does not have a minimum, but rather gradually decreases at large \(\phi\). In such models the inflaton field does not oscillate after inflation, and its effective mass becomes vanishingly small, so the standard theory of reheating based on the decay of the oscillating inflaton field does not apply. For a long time the only mechanism of reheating in such non-oscillatory (NO) models was based on gravitational particle production in an expanding universe. This mechanism is very inefficient. We will show that it may lead to cosmological problems associated with large isocurvature fluctuations and overproduction of dangerous relics such as gravitinos and moduli fields. We also note that the setting of initial conditions for the stage of reheating in these models should be reconsidered. All of these problems can be resolved in the context of the recently proposed scenario of instant preheating if there exists an interaction \({g^2} \phi^2\chi^2\) of the inflaton field \(\phi\) with another scalar field \(\chi\). We show that the mechanism of instant preheating in NO models is much more efficient than the usual mechanism of gravitational particle production even if the coupling constant \(g^2\) is extremely small, \(10^{-14} \ll g^2 \ll 1\).

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          • Record: found
          • Abstract: found
          • Article: found
          Is Open Access

          Inflation and Preheating in NO models

          We study inflationary models in which the effective potential of the inflaton field does not have a minimum, but rather gradually decreases at large \(\phi\). In such models the inflaton field does not oscillate after inflation, and its effective mass becomes vanishingly small, so the standard theory of reheating based on the decay of the oscillating inflaton field does not apply. For a long time the only mechanism of reheating in such non-oscillatory (NO) models was based on gravitational particle production in an expanding universe. This mechanism is very inefficient. We will show that it may lead to cosmological problems associated with large isocurvature fluctuations and overproduction of dangerous relics such as gravitinos and moduli fields. We also note that the setting of initial conditions for the stage of reheating in these models should be reconsidered. All of these problems can be resolved in the context of the recently proposed scenario of instant preheating if there exists an interaction \({g^2} \phi^2\chi^2\) of the inflaton field \(\phi\) with another scalar field \(\chi\). We show that the mechanism of instant preheating in NO models is much more efficient than the usual mechanism of gravitational particle production even if the coupling constant \(g^2\) is extremely small, \(10^{-14} \ll g^2 \ll 1\).
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            Particle creation by a self-coupled scalar field

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              Author and article information

              Journal
              15 March 1999
              1999-06-21
              Article
              10.1103/PhysRevD.60.103505
              hep-ph/9903350
              4887fe60-db7d-43a2-9722-7ee3886f0223
              History
              Custom metadata
              SU-ITP-99-15
              Phys.Rev.D60:103505,1999
              10 pages, revtex
              hep-ph astro-ph gr-qc hep-th

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