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Search Results: 1 - 10 of 57897 matches for " Chia-Min Lin "
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Large non-Gaussianity generated at the end of Extended D-term Hybrid Inflation
Chia-Min Lin
Physics , 2009,
Abstract: In this paper, we show that if we extend D-term hybrid inflation by adding a light scalar field which couples to a waterfall field, large non-Gaussianity can be generated at the end of inflation. Contribution of cosmic strings generated after D-term inflation to the Cosmic Microwave Background (CMB) angular power spectrum can be as low as 10% and this also evade the spectral index problem.
Triple Unification of Inflation, Dark matter and Dark energy in Chaotic Braneworld Inflation
Chia-Min Lin
Physics , 2009,
Abstract: In this paper, we show that in the framework of chaotic braneworld inflation, after preheating, the remaining oscillating inflaton field can play the role of dark matter with the observed level. Augmented by a non-zero effective cosmological constant $\Lambda_4$ on the brane, triple unification of inflation, dark matter and dark energy by a single field is realized. Our model perhaps is the simplest one in the market of theories to achieve triple unification.
Hilltop Supernatural Inflation
Chia-Min Lin
Physics , 2010, DOI: 10.1142/S0218271811019669
Abstract: In this talk, I will explain how to reduce the spectral index to be n_s=0.96 for supernatural inflation. I will also show the constraint to the reheating temperature from Big Bang Nucleosynthesis of both thermal and non-thermal gravitino production.
Passive Curvaton
Chia-Min Lin
Physics , 2012, DOI: 10.1016/j.physletb.2013.06.019
Abstract: We propose a class of curvaton models which we call passive curvaton. In this paper, two kinds of passive curvaton is considered. The first one is a pseudoscalar curvaton couples to a gauge field. Different from the inflaton case, the constraint from formation of primordial black holes (PBHs) is much weaker and large non-gaussianity (of the equiliteral type) can be produced. The second model is a dilaton-like scalar curvaton couples to a gauge field. We investigate the scale dependence of non-gaussianity in this model. In both models, the spectrum and non-Gaussianity are enhanced by the slow-roll parameter of the curvaton field. Other possible passive curvaton models are also mentioned.
Super Hilltop Inflation
Lin, Chia-Min;Cheung, Kingman
High Energy Physics - Phenomenology , 2008, DOI: 10.1088/1475-7516/2009/03/012
Abstract: In this paper, we consider logarithmic radiative corrections and higher order terms to the supersymmetric hilltop F- and D-term hybrid inflation models. Conventional F- and D-term hybrid inflation only predicts $n_s \gae 0.98$. We show that via a positive quadratic and a negative quartic correction the spectral index can be reduced to $n_s=0.96$ suggested from latest WMAP result and also cosmic string problem appeared in SUSY hybrid inflation can be solved with mild tuning of the parameters if $\kappa \lae 0.01$ for F-term inflation and $g \lae 0.05$ for D-term inflation.
Supergravity and Two-Field Inflation Effects in Right-Handed Sneutrino-Modified D-term Inflation
Lin, Chia-Min;McDonald, John
High Energy Physics - Phenomenology , 2007, DOI: 10.1103/PhysRevD.77.063529
Abstract: We extend previous work on the minimal D-term inflation model modified by Right-Handed (RH) sneutrino fields to include additional inflaton-sector SUGRA corrections and two-field inflation effects. We show that SUGRA corrections simultaneously allow n_{s} to be within 3-year WMAP limits and the cosmic string contribution to the CMB power spectrum to be less than 5%. For gauge coupling g < 1, the CMB contribution from cosmic strings is predicted to be at least 1% while the spectral index is predicted to be less than 0.968 for a CMB string contribution less than 5%. Treating the inflaton-RH sneutrino system as a two-field inflation model, we show that the time-dependence of the RH sneutrino field strongly modifies the single-field results for values of RH sneutrino mass m_{\Phi} > 0.1 H. The running spectral index is \alpha = -0.0002 when m_{\Phi} < 0.1 H but increases to positive values as m_{\Phi}/H increases, with \alpha > 0.008 for m_{\Phi} > 1.0 H.
Supernatural A-term Inflation
Chia-Min Lin,Kingman Cheung
Physics , 2009, DOI: 10.1142/S0217732310033207
Abstract: Following \cite{Lin:2009yt}, we explore the parameter space of the case when the supersymmetry (SUSY) breaking scale is lower, for example, in gauge mediated SUSY breaking model. During inflation, the form of the potential is $V_0$ plus MSSM (MSSM stands for Minimal Supersymmetric Standard Model) (or A term (It is called A-term inflation when the inflaton field is any direction (gauge or singlet) that generates an A-term.)) inflation. We show that the model works for a wide range of the potential $V_0$ with the soft SUSY breaking mass $m\sim O(1)$ TeV. The implication to MSSM (or A-term) inflation is that the flat directions which is lifted by the non-renormalizable terms described by the superpotential $W=\lambda_p \phi^{p-1}/M^{p-3}_P$ with $p=4$ and $p=5$ are also suitable to be an inflaton field for $\lambda_p=O(1)$ provided there is an additional false vacuum term $V_0$ with appropriate magnitude. The flat directions corresponds to $p=6$ also works for $0 \lae V_0/M_P^4 \lae 10^{-40}$.
Large non-Gaussianity generated after D-term Inflation by Right-Handed Sneutrino Curvaton
Chia-Min Lin,Kingman Cheung
Physics , 2009, DOI: 10.1088/1475-7516/2009/06/006
Abstract: In this paper, we consider large non-Gaussianity generated after D-term inflation in the case that the adiabatic curvature perturbation produced is dominated by a right-handed (RH) sneutrino curvaton. The cosmic string problem can also be evaded with around 10% contribution to the CMB power spectrum and the spectral index $n_s \simeq 1$. The non-Gaussianity produced can be as large as $10
Hilltop Supernatural Inflation and Gravitino Problem
Kazunori Kohri,Chia-Min Lin
Physics , 2010, DOI: 10.1088/1475-7516/2010/11/010
Abstract: In this paper, we explore the parameter space of hilltop supernatural inflation model and show the regime within which there is no gravitino problem even if we consider both thermal and nonthermal production mechanisms. We make plots for the allowed reheating temperature as a function of gravitino mass by constraints from big-bang nucleosynthesis. We also plot the constraint when gravitino is assumed to be stable and plays the role of dark matter.
Reducing the Spectral Index in Supernatural Inflation
Chia-Min Lin,Kingman Cheung
Physics , 2009, DOI: 10.1103/PhysRevD.79.083509
Abstract: Supernatural inflation is an attractive model based just on a flat direction with soft SUSY breaking mass terms in the framework of supersymmetry. The beauty of the model is inferred from its name that the model needs no fine-tuning. However, the prediction of the spectral index is $n_s \gae 1$, in contrast to experimental data. In this paper, we show that the beauty of supernatural inflation with the spectral index reduced to $n_s=0.96$ without any fine-tuning, by considering the general feature that a flat direction is lifted by a non-renormalizable term with an A-term.
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