Готові списки джерел за темами / Fermion preheating

Добірка наукової літератури з теми "Fermion preheating"

Автор: Grafiati
Опубліковано: 14 березня 2023

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Статті в журналах з теми "Fermion preheating"

1

Klaric, J., A. Shkerin, and G. Vacalis. "Non-perturbative production of fermionic dark matter from fast preheating." Journal of Cosmology and Astroparticle Physics 2023, no. 02 (February 1, 2023): 034. http://dx.doi.org/10.1088/1475-7516/2023/02/034.

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Abstract We investigate non-perturbative production of fermionic dark matter in the early universe. We study analytically the gravitational production mechanism accompanied by the coupling of fermions to the background inflaton field. The latter leads to the variation of effective fermion mass during preheating and makes the resulting spectrum and abundance sensitive to its parameters. Assuming fast preheating that completes in less than the inflationary Hubble time and no oscillations of the inflaton field after inflation, we find an abundant production of particles with energies ranging from the inflationary Hubble rate to the inverse duration of preheating. The produced fermions can account for all observed dark matter in a broad range of parameters. As an application of our analysis, we study non-perturbative production of fermionic dark matter in the model of Palatini Higgs inflation.
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2

Sorbo, L. "Fermion preheating: analytical results." Nuclear Physics B - Proceedings Supplements 95, no. 1-3 (April 2001): 86–89. http://dx.doi.org/10.1016/s0920-5632(01)01062-3.

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3

García-Bellido, Juan, Silvia Mollerach, and Esteban Roulet. "Fermion production during preheating after hybrid inflation." Journal of High Energy Physics 2000, no. 02 (February 21, 2000): 034. http://dx.doi.org/10.1088/1126-6708/2000/02/034.

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4

Bassett, Bruce A., Marco Peloso, Lorenzo Sorbo, and Shinji Tsujikawa. "Fermion production from preheating-amplified metric perturbations." Nuclear Physics B 622, no. 1-2 (February 2002): 393–415. http://dx.doi.org/10.1016/s0550-3213(01)00608-3.

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5

Greene, Patrick B., and Lev Kofman. "Preheating of fermions." Physics Letters B 448, no. 1-2 (February 1999): 6–12. http://dx.doi.org/10.1016/s0370-2693(99)00020-9.

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Tsujikawa, Shinji, Bruce A. Bassett, and Fermin Viniegra. "Multi-field fermionic preheating." Journal of High Energy Physics 2000, no. 08 (August 17, 2000): 019. http://dx.doi.org/10.1088/1126-6708/2000/08/019.

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7

Giraud, Alexandre, and Julien Serreau. "Nonlinear dynamics of fermions during preheating." Nuclear Physics A 820, no. 1-4 (April 2009): 215c—218c. http://dx.doi.org/10.1016/j.nuclphysa.2009.01.053.

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8

Giudice, Gian Francesco, Antonio Riotto, Igor Tkachev, and Marco Peloso. "Production of massive fermions at preheating and leptogenesis." Journal of High Energy Physics 1999, no. 08 (August 23, 1999): 014. http://dx.doi.org/10.1088/1126-6708/1999/08/014.

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9

Peloso, Marco, and Lorenzo Sorbo. "Preheating of massive fermions after inflation: analytical results." Journal of High Energy Physics 2000, no. 05 (May 6, 2000): 016. http://dx.doi.org/10.1088/1126-6708/2000/05/016.

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10

Arnold, H., J. F. Drake, M. Swisdak, F. Guo, J. T. Dahlin, and Q. Zhang. "Slow Shock Formation Upstream of Reconnecting Current Sheets." Astrophysical Journal 926, no. 1 (February 1, 2022): 24. http://dx.doi.org/10.3847/1538-4357/ac423b.

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Анотація:
Abstract The formation, development, and impact of slow shocks in the upstream regions of reconnecting current layers are explored. Slow shocks have been documented in the upstream regions of magnetohydrodynamic (MHD) simulations of magnetic reconnection as well as in similar simulations with the kglobal kinetic macroscale simulation model. They are therefore a candidate mechanism for preheating the plasma that is injected into the current layers that facilitate magnetic energy release in solar flares. Of particular interest is their potential role in producing the hot thermal component of electrons in flares. During multi-island reconnection, the formation and merging of flux ropes in the reconnecting current layer drives plasma flows and pressure disturbances in the upstream region. These pressure disturbances steepen into slow shocks that propagate along the reconnecting component of the magnetic field and satisfy the expected Rankine–Hugoniot jump conditions. Plasma heating arises from both compression across the shock and the parallel electric field that develops to maintain charge neutrality in a kinetic system. Shocks are weaker at lower plasma β, where shock steepening is slow. While these upstream slow shocks are intrinsic to the dynamics of multi-island reconnection, their contribution to electron heating remains relatively minor compared with that from Fermi reflection and the parallel electric fields that bound the reconnection outflow.
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Дисертації з теми "Fermion preheating"

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Sorbo, Lorenzo. "Brane Models and Preheating of Fermions: New Scenarios and New Phenomenology for the Early Universe." Doctoral thesis, SISSA, 2001. http://hdl.handle.net/20.500.11767/4278.

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Анотація:
Astroparticle physics and cosmology are experiencing an impressive development. The acquisition of more and more accurate observational data has recalled a great interest on these subjects, that provide a unique source of hints about the physics that lies far beyond the Standard Model. Parallely, the theoretical aspects of cosmology are also in rapid evolution along two main directions. The first one is related to the rise of radically new paradigms in model building, that has opened a wide range of new perspectives. The second is aimed at the achievement of a deeper and more detailed understanding of the "orthodox" picture that we have of the Early Universe. This thesis is divided into two parts. In the first part, cosmological aspects of brane models are discussed. This class of models, in which gravity can propagate in a supplementary space while matter is bound to the usual three dimensional space, has been recently proposed as a solution to the hierarchy problem. However, it has been soon realized that new scenarios arise for cosmology in this framework. In particular, possible modifications of the standard baryogenesis schemes and of the cosmological evolution of the Universe will be discussed. In the second part, a detailed analysis of fermion preheating will be carried out. The stage between the inflationary and the radiation dominated epochs of the early Universe is currently one of the most active areas of research in cosmology. In particular, nonthermal production of matter has been proven to be a substantial ingredient in the analysis of this stage. The phenomenologically most relevant effects related to the production of gravitinos at preheating will be especially highlighted.
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Peloso, Marco. "New Perspectives for the First Second: Preheating of Fermions and Extra-Dimensions." Doctoral thesis, SISSA, 2000. http://hdl.handle.net/20.500.11767/4233.

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Анотація:
In this thesis I discuss two separate issues related to the very early Universe. The first of them is preheating of fermions. Creation of matter from the inflaton field is one of the most active areas of research of the inflationary scenario. In the last ten years, it has been realized that the first stages of this process are typically governed by relevant nonperturbative production of particles. Creation of bosons is very efficient, since it is characterized by stimulated particle emission into energy bands with large occupation number. It was very recently realized that preheating of fermions can be in some cases even more relevant, despite large occupation numbers are forbidden by Pauli principle. In the first part of the thesis I review the analyses (first numerical and then analytical) which have lead to this conclusion. I then discuss the possible implications for leptogenesis. The second part of the thesis is instead devoted to extra dimensions. The last two and a half years have witnessed a formidable interest in models (I will simply refer to them as to "brane models") where the extra-dimensions manifest themselves not too far from the electroweak scale. The initial motivation for these studies was to provide a solution to the hierarchy problem. I discuss this issue in the first chapter of this part, where brane models are introduced. ·while these scenarios are compatible with the Newton law at the distances we presently probe, they can lead to a very interesting new phenomenology both in accelerator physics and in cosmology. Concerning the latter, I discuss possible modifications of the standard baryogenesis scenarios and of the cosmological evolution of the Universe.
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Тези доповідей конференцій з теми "Fermion preheating"

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TSUJIKAWA, SHINJI. "MULTI-FIELD FERMIONIC PREHEATING." In Proceedings of the Fourth International Workshop on Particle Physics and the Early Universe. WORLD SCIENTIFIC, 2001. http://dx.doi.org/10.1142/9789812799678_0032.

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2

Larsen, Jon T., and Roy R. Johnson. "The KMSF low preheat implosion experiments." In OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1986. http://dx.doi.org/10.1364/oam.1986.tum1.

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Анотація:
Laser driven inertial confinement fusion (ICF) experiments are being performed at several laboratories throughout the world. Nearly all are seeking to demonstrate compressed fuel densities of several tens of g/cm3. For ICF to be an efficient process, it is desirable to compress the fuel along a near-Fermi degenerate adiabat to densities of several hundred g/cm3. Addition of thermal energy prior to achieving the compressed state is detrimental in that a significantly larger driver would be required. Preheating of the fuel prior to compression may result from radiation or thermal electron conduction, or nonisentropic processes such as shock heating. Recent experiments at KMSF sought to control these by a combination of target and laser parameters. Using a spherical illumination system, the target is irradiated with a carefully prescribed temporal pulse of frequency-doubled neodymium glass laser light. Low preheat targets are designed with thick polymer (polyvinyl alcohol) shells and cryogenic fuel layers. The implosion process is recorded by a number of optical and x-ray diagnostics. A four-frame holographic interferometer records the temporal evolution of the ablated plasma while an x-ray pinhole camera records the symmetry of the compressed core. The most important diagnostic is the combined x-ray backlighter/streak camera combination which records the implosion trajectory in one dimension. A comparison of the data from these three major diagnostics with the results from the hydrodynamic simulation code allows one to interpret the final state the fuel reached. Record fuel densities in excess of 35 g/cm3 have been achieved.
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