Готові списки джерел за темами / Baryon Asymmetry Universe

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Добірка наукової літератури з теми "Baryon Asymmetry Universe"

Автор: Grafiati

Опубліковано: 13 квітня 2024

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Статті в журналах з теми "Baryon Asymmetry Universe"

Císcar-Monsalvatje, Mar, Alejandro Ibarra, and Jérôme Vandecasteele. "Matter-antimatter asymmetry and dark matter stability from baryon number conservation." Journal of Cosmology and Astroparticle Physics 2024, no. 01 (January 1, 2024): 028. http://dx.doi.org/10.1088/1475-7516/2024/01/028.

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Abstract There is currently no evidence for a baryon asymmetry in our universe. Instead, cosmological observations have only demonstrated the existence of a quark-antiquark asymmetry, which does not necessarily imply a baryon asymmetric Universe, since the baryon number of the dark sector particles is unknown. In this paper we discuss a framework where the total baryon number of the Universe is equal to zero, and where the observed quark-antiquark asymmetry arises from neutron portal interactions with a dark sector fermion N that carries baryon number. In order to render a baryon symmetric universe throughout the whole cosmological history, we introduce a complex scalar χ, with opposite baryon number and with the same initial abundance as N. Notably, due to the baryon number conservation, χ is absolutely stable and could have an abundance today equal to the observed dark matter abundance. Therefore, in this simple framework, the existence of a quark-antiquark asymmetry is intimately related to the existence (and the stability) of dark matter.

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Sakharov, Andrei D. "Baryon asymmetry of the universe." Uspekhi Fizicheskih Nauk 161, no. 5 (1991): 110–20. http://dx.doi.org/10.3367/ufnr.0161.199105o.0110.

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Sakharov, Andrei D. "Baryon asymmetry of the universe." Soviet Physics Uspekhi 34, no. 5 (May 31, 1991): 417–21. http://dx.doi.org/10.1070/pu1991v034n05abeh002504.

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Feng, Zhong-Wen, Xia Zhou, and Shi-Qi Zhou. "Higher-order generalized uncertainty principle applied to gravitational baryogenesis." Journal of Cosmology and Astroparticle Physics 2022, no. 06 (June 1, 2022): 022. http://dx.doi.org/10.1088/1475-7516/2022/06/022.

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Abstract The gravitational baryogenesis plays an important role in the study of baryon asymmetry. However, the original mechanism of gravitational baryogenesis in the radiation-dominated era leads to the asymmetry factor η equal to zero, which indicates this mechanism may not generate a sufficient baryon asymmetry in the early Universe. In this paper, we investigate the gravitational baryogenesis for the generation of baryon asymmetry in the early Universe by using a new higher-order generalized uncertainty principle (GUP). It is demonstrated that the entropy and the Friedman equation of the Universe deviate from the original cases due to the effect of the higher-order GUP. Those modifications break the thermal equilibrium of the Universe, and in turn produce a non-zero asymmetry factor η. In particular, our results satisfy all of Sakharov's conditions, which indicates that the scheme of explaining baryon asymmetry in the framework of higher-order GUP is feasible. In addition, combining our theoretical results with the observational data, we constraint the GUP parameter β 0, whose bound is between 8.4 × 1010 ∼ 1.1 × 1013.

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Fridell, Kåre, Julia Harz, and Chandan Hati. "Neutron-antineutron oscillations as a probe of baryogenesis." Journal of Physics: Conference Series 2156, no. 1 (December 1, 2021): 012015. http://dx.doi.org/10.1088/1742-6596/2156/1/012015.

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Abstract A signal of neutron-antineutron ( n − n ¯ ) oscillations at experiments like the Deep Underground Neutrino Experiment or the European Spallation Source, would directly imply baryon number violation and will point towards physics beyond the Standard Model. The discovery of such a signal would have important implications for baryogenesis mechanisms in the early Universe, which can explain the observed baryon asymmetry of the Universe today. Here we discuss how an observed rate for n − n ¯ oscillations can directly be correlated with the washout of baryon asymmetry in the early Universe and therefore, can probe high- and low-scale baryogenesis scenarios in synergy with collider searches.

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Beylin, Vitaly A., Maxim Yu Khlopov, and Danila O. Sopin. "Asymmetric Dark Matter in Baryon Asymmetrical Universe." Symmetry 16, no. 3 (March 6, 2024): 311. http://dx.doi.org/10.3390/sym16030311.

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New heavy particles with electroweak charges arise in extensions of the standard model. They should take part in sphaleron transitions in the early Universe, which balance baryon asymmetry with the excess of new charged particles. If electrically charged with charge −2n, they bind with n nuclei of primordial helium in dark atoms of dark matter. This makes it possible to find the ratio of densities of asymmetric dark matter and baryonic matter. Examples of the model with new, successive, and stable generation of quarks and leptons and the minimal walking technicolor model are considered.

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Shaposhnikov, M. "Baryon Asymmetry of the Universe and Neutrinos." Progress of Theoretical Physics 122, no. 1 (July 1, 2009): 185–203. http://dx.doi.org/10.1143/ptp.122.185.

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Kawasaki, Masahiro, and Kai Murai. "Lepton asymmetric universe." Journal of Cosmology and Astroparticle Physics 2022, no. 08 (August 1, 2022): 041. http://dx.doi.org/10.1088/1475-7516/2022/08/041.

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Abstract The recent observation of 4He implies that our universe has a large lepton asymmetry. We consider the Affleck-Dine (AD) mechanism for lepton number generation. In the AD mechanism, non-topological solitons called L-balls are produced, and the generated lepton number is confined in them. The L-balls protect the generated lepton number from being converted to baryon number through the sphaleron processes. We study the formation and evolution of the L-balls and find that the universe with large lepton asymmetry suggested by the recent 4He measurement can be realized.

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PETCOV, S. T. "NEUTRINO MIXING, LEPTONIC CP VIOLATION, THE SEESAW MECHANISM AND BEYOND." International Journal of Modern Physics A 25, no. 23 (September 20, 2010): 4325–37. http://dx.doi.org/10.1142/s0217751x1005069x.

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The phenomenology of 3-neutrino mixing and of the related Dirac and Majorana leptonic CP violation is reviewed. The leptogenesis scenario of generation of the baryon asymmetry of the Universe, which is based on the see-saw mechanism of neutrino mass generation, is considered. The results showing that the CP violation necessary for the generation of the baryon asymmetry of the Universe in leptogenesis can be due exclusively to the Dirac and/or Majorana CP-violating phase(s) in the neutrino mixing matrix U are briefly reviewed.

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Mahanta, Devabrat, and Debasish Borah. "WIMPy leptogenesis in non-standard cosmologies." Journal of Cosmology and Astroparticle Physics 2023, no. 03 (March 1, 2023): 049. http://dx.doi.org/10.1088/1475-7516/2023/03/049.

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Abstract We study the possibility of generating baryon asymmetry of the universe from dark matter (DM) annihilations during non-standard cosmological epochs. Considering the DM to be of weakly interacting massive particle (WIMP) type, the generation of baryon asymmetry via leptogenesis route is studied where WIMP DM annihilation produces a non-zero lepton asymmetry. Adopting a minimal particle physics model to realise this along with non-zero light neutrino masses, we consider three different types of non-standard cosmic history namely, (i) fast expanding universe, (ii) early matter domination and (iii) scalar-tensor theory of gravity. By solving the appropriate Boltzmann equations incorporating such non-standard history, we find that the allowed parameter space consistent with DM relic and observed baryon asymmetry gets enlarged with the possibility of lower DM mass in some scenarios. While such lighter DM can face further scrutiny at direct search experiments, the non-standard epochs offer complementary probes on their own.

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Більше джерел

Дисертації з теми "Baryon Asymmetry Universe"

Sato, Eduardo Akio 1991. "Investigando a influência do setor leptônico em mecanismos de bariogênese." [s.n.], 2016. http://repositorio.unicamp.br/jspui/handle/REPOSIP/320984.

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Orientador: Pedro Cunha de Holanda
Dissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Física Gleb Wataghin
Made available in DSpace on 2018-08-31T06:55:32Z (GMT). No. of bitstreams: 1 Sato_EduardoAkio_M.pdf: 2319995 bytes, checksum: fc82384c799d5812bf14a71fe2723e2d (MD5) Previous issue date: 2016
Resumo: Nesta dissertação analiso como uma classe de modelos sugeridos para acomodar neutrinos massivos no modelo padrão, os assim chamados mecanismos seesaw, podem também resolver o problema de assimetria bariônica no universo. Os requisitos mínimos para uma geração dinâmica bem sucedida de assimetria bariônica, conhecidos como condições de Sakharov, são: não conservação de número bariônico, violação de simetria CP e ausência de equilíbrio térmico. Para mostrar que mecanismos seesaw respeitam estas regras, reviso alguns tópicos como: a violação de número bariônico através do processo de sphalerons, a teoria de violação de CP através de invariantes de base fraca e a mecânica estatística de não equilíbrio através da equação de Boltzmann. Como exemplo considero um cenário de mecanismo seesaw tipo I (3+3) com massas de neutrinos estéreis altamente hierárquicas. A assimetria observada impõe um limite inferior na massa dos neutrinos estéreis ($M_1 \geq 8.4 \times 10^{8} \; \text{GeV}$) e um limite superior na massa dos neutrinos ativos ($m_1 < 0.11 \; \text{eV}$), consistente com limites previamente obtidos na literatura
Abstract: In this dissertation I analyse how a class of models suggested to accommodate massive neutrinos in the standard model, the so-called seesaw mechanisms, can also solve the baryon asymmetry of the universe problem. The minimal requisites to a successful dynamical generation of baryon asymmetry, known as Sakharov's conditions, are: Non-conservation of baryon number, violation of CP symmetry and absence of thermal equilibrium. To show that seesaw mechanisms respect those rules, I review some topics such as: the standard model baryon non-conservation via sphalerons process, the theory of CP violation via weak-basis invariants and non-equilibrium statistical physics via Boltzmann equation. As a example I consider a type I (3+3) seesaw mechanism scenario with highly hierarchical sterile neutrino masses and the observed asymmetry impose a lower bound in the sterile neutrino masses ($M_1 \geq 8.4 \times 10^{8} \; \text{GeV}$) and a upper bound in the active neutrino masses ($m_1 < 0.11 \; \text{eV}$), consistent with limits previously obtained in the literature
Mestrado
Física
Mestre em Física
1370441/2014
CAPES

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Bouillaud, Thomas. "Le champ magnétique interne de l'expérience n2EDM pour sonder la symétrie CP : calcul du champ magique et maîtrise des non-uniformités." Electronic Thesis or Diss., Université Grenoble Alpes, 2023. http://www.theses.fr/2023GRALY065.

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Les Moments Dipolaires Électriques (EDMs) de particules de spin 1/2 telles quele neutron constituent des sondes privilégiées de violation Charge-Parité (CP) au-delà du Modèle Standard, l’une des conditions requises pour expliquer l’asymétriebaryonique de l’Univers. L’expérience n2EDM, actuellement en cours d’assemblageau Paul Scherrer Institute en Suisse, est un des efforts majeurs de recherche de l’EDMdu neutron. Celle-ci consiste à soumettre des Neutrons Ultra-Froids (UCNs) polar-isés à des champs magnétiques et électriques appliqués parallèlement et de mesurerleur fréquence de précession. Cette expérience a pour objectif d’atteindre une sensi-bilité inégalée ∆dn ≤ 10−27 e cm, à condition de satisfaire des exigences très strictesen matière de maîtrise des erreurs statistiques et systématiques. Le travail présentédans ce manuscrit s’articule autour du contrôle d’effets systématiques induits parles non-uniformités du champ magnétique, à travers à la fois le calcul d’un de ceseffets et la caractérisation du milieu magnétique de l’expérience.La première partie de cette thèse justifie et présente n2EDM, en s’arrêtant surle thème de l’uniformité magnétique de l’expérience. Nous commençons par rap-peler les fondements théoriques sur lesquels reposent les recherches d’EDMs, quidécoulent d’observations cosmologiques selon lesquelles les interactions violant CPdoivent exister dans la nature et de l’incapacité du Modèle Standard (MS) à enfournir suffisamment. Nous présentons ensuite l’expérience n2EDM, en particulierla méthode de Ramsey sur laquelle celle-ci s’appuie pour déterminer la fréquencede précession des UCNs. Ceci nous permet enfin de détailler les exigences strictesd’uniformité que le champ magnétique interne doit satisfaire, ainsi que de justi-fier l’existence de contributions non uniformes en étudiant les symétries du champgénéré.La deuxième partie est axée autour du faux EDM, un effet systématique inquié-tant pour n2EDM qui naît de la combinaison d’un champ magnétique relativiste etde non-uniformités aléatoires. Nous proposons d’abord une nouvelle expression dufaux EDM dans le domaine fréquentiel via le théorème de Wiener-Khinchin, avant del’étendre à une approche récente permettant d’annuler cet effet en ajustant le champmagnétique à une valeur dite “magique”. Nous concluons grâce à notre calcul al-ternatif du champ magique et à son extension aux champs générés par des dipôlesmagnétiques qu’il est possible de supprimer le faux EDM d’au moins un ordre degrandeur en choisissant un champ magnétique de 10.5 μT.La troisième partie s’appuie sur une cartographie du champ magnétique pour es-timer et corriger les non-uniformités à l’origine d’effets indésirables tels que le fauxEDM. Après avoir établi l’exactitude de l’instrument de cartographie et maitrisé lesvariations du champ résiduel, nous montrons à travers l’analyse des données decartographie que l’environnement magnétique de n2EDM satisfait pleinement auxexigences statistiques et systématiques de l’expérience. Enfin, nous proposons et ap-pliquons une stratégie d’optimisation du champ afin de réduire davantage les non-uniformités résiduelles. Notre champ optimisé génère un faux EDM négligeable etprésente un niveau d’uniformité sans précédent, avec un écart quadratique moyensur la composante verticale σ(Bz) = 35 pT au sein du volume de précession
Electric Dipole Moments (EDMs) in spin 1/2 particles such as the neutron are highlysensitive probes for Charge-Parity (CP) violation Beyond the Standard Model (BSM),one of the requirements needed to fully explain the Baryon Asymmetry of the Uni-verse (BAU). The n2EDM experiment, currently in the commissioning phase at thePaul Scherrer Institute in Switzerland, constitutes a leading effort to search for theneutron EDM. It relies on the principle of submitting spin-polarized Ultra-Cold Neu-trons (UCNs) to parallel electric and magnetic fields and measuring their precessionfrequency. This experiment hopes to achieve a record sensitivity ∆dn ≤ 10−27 e cm,a goal which can only be reached by tackling statistical and systematical uncertain-ties affecting the measurement. The work we present here contributes to the controlof systematic errors generated by non-uniform magnetic fields, through the calcula-tion of a systematic effect and the precise characterization of the internal magneticenvironment.The first part of this thesis motivates and introduces the n2EDM experiment,particularly the theme of magnetic field uniformity. We begin with a review of thetheoretical grounds on which EDM experiments stand, which are prompted by cos-mological observations that CP-violating interactions must exist in nature, and bythe inability of the Standard Model (SM) of particle physics to provide enough ofthese. We then present the n2EDM experiment, which relies at its core on the Ram-sey method of separated rotating magnetic fields to determine the spin-precessionfrequency of UCNs. We finally give the stringent uniformity requirements that theinternal magnetic environment of n2EDM must satisfy, and justify the existence ofnon-uniform contributions by studying the symmetries of the generated field.The second part focuses on the so-called false EDM, a dire systematic effect inn2EDM arising from the unfortunate combination of a relativistic motional field andrandom non-uniformities. We first propose a new frequency-domain derivation ofthe false EDM via the Wiener-Khinchin theorem, before expanding on a recent ap-proach to cancel this effect by tuning the coil-generated field to a “magic value”.We conclude through our alternative calculation of the magic field, and its extensionto dipole-like magnetic contaminations, that it is possible to suppress the total falseEDM by at least one order of magnitude by setting the magnetic field to a value of10.5 μT.The third part relies on magnetic field mapping to estimate and correct non-uniformities responsible for undesirable effects such as the false EDM. After es-tablishing the accuracy of the mapping apparatus and taming unruly residual fieldpatterns, we show through an analysis of the mapping data that the n2EDM mag-netic environment fully satisfies the experiment’s statistical and systematical re-quirements. We finally propose and apply a field optimization strategy to suppressresidual non-uniformities even further. The optimized field generates a negligiblefalse EDM and boasts an unprecedented level of uniformity, with a root mean squaredeviation on the vertical field component σ(Bz) = 35 pT over the neutron’s preces-sion volume

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Bachri, Abdel G. "Baryon asymmetry of the universe and neutrino physics." 2007. http://digital.library.okstate.edu/etd/umi-okstate-2419.pdf.

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Ramos, Maria Pestana da Luz Pereira. "CPT, Modified Gravity and the Baryon Asymmetry of the Universe." Master's thesis, 2017. https://repositorio-aberto.up.pt/handle/10216/110574.

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Ramos, Maria Pestana da Luz Pereira. "CPT, Modified Gravity and the Baryon Asymmetry of the Universe." Dissertação, 2017. https://repositorio-aberto.up.pt/handle/10216/110574.

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Частини книг з теми "Baryon Asymmetry Universe"

Rubakov, V. A. "Baryon Asymmetry of the Universe." In Techniques and Concepts of High-Energy Physics, 97–141. Dordrecht: Springer Netherlands, 2001. http://dx.doi.org/10.1007/978-94-010-0522-7_3.

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Biondini, Simone. "Baryon Asymmetry in the Early Universe." In Effective Field Theories for Heavy Majorana Neutrinos in a Thermal Bath, 7–32. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-63901-7_2.

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Fukugita, Masataka, and Tsutomu Yanagida. "Baryon Asymmetry in the Universe and Neutrinos." In Physics of Neutrinos, 487–516. Berlin, Heidelberg: Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/978-3-662-05119-1_11.

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Amusia, Miron Ya, Konstantin G. Popov, Vasily R. Shaginyan, and Vladimir A. Stephanovich. "Baryon Asymmetry Resulting from FCQPT in the Early Universe." In Theory of Heavy-Fermion Compounds, 273–83. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-10825-4_16.

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Mukherjee, Ananya. "Origin of Dark Matter and Baryon Asymmetry of the Universe in an $$A_4$$ Flavor Symmetric Neutrino Mass Model." In Springer Proceedings in Physics, 281–87. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-6292-1_34.

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"Baryon Asymmetry of the Universe." In Particle and Astroparticle Physics, 443–74. CRC Press, 2007. http://dx.doi.org/10.1201/9781584889328-26.

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"Baryon Asymmetry of the Universe." In Particle and Astroparticle Physics, 461–78. Taylor & Francis, 2007. http://dx.doi.org/10.1201/9781584889328.ch16.

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"Generation of Baryon Asymmetry." In Introduction to the Theory of the Early Universe, 313–76. WORLD SCIENTIFIC, 2017. http://dx.doi.org/10.1142/9789813220041_0011.

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"Generation of Baryon Asymmetry." In Introduction to the Theory of the Early Universe, 243–99. World Scientific Publishing Company, 2011. http://dx.doi.org/10.1142/9789814322256_0011.

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SAKHAROV, A. D. "VIOLATION OF CP-INVARIANCE, C-ASYMMETRY, AND BARYON ASYMMETRY OF THE UNIVERSE." In In the Intermissions…, 84–87. WORLD SCIENTIFIC, 1998. http://dx.doi.org/10.1142/9789812815941_0013.

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Тези доповідей конференцій з теми "Baryon Asymmetry Universe"

SHAPOSHNIKOV, MIKHAIL. "NEUTRINOS, DARK MATTER AND BARYON ASYMMETRY OF THE UNIVERSE." In Proceedings of the 33rd International Conference. World Scientific Publishing Company, 2007. http://dx.doi.org/10.1142/9789812790873_0021.

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Peloso, Marco. "Nonperturbative production of fermions and the baryon asymmetry." In Proceedings of the Third International Workshop on Particle Physics and the Early Universe. WORLD SCIENTIFIC, 2000. http://dx.doi.org/10.1142/9789812792129_0029.

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Petcov, Serguey. "Leptonic CP Violation and the Baryon Asymmetry of the Universe." In 2nd World Summit: Exploring the Dark Side of the Universe. Trieste, Italy: Sissa Medialab, 2018. http://dx.doi.org/10.22323/1.335.0023.

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BRUSTEIN, RAM, and DAVID H. OAKNIN. "BARYON NUMBER ASYMMETRY INDUCED BY COHERENT MOTIONS OF A COSMOLOGICAL AXION-LIKE PSEUDOSCALAR." In Proceedings of the Third International Workshop on Particle Physics and the Early Universe. WORLD SCIENTIFIC, 2000. http://dx.doi.org/10.1142/9789812792129_0064.

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Kirilova, Daniela, and Mariana Panayotova. "Baryon asymmetry of the universe generated by scalar field condensate baryogenesis model in different inflationary scenarios." In 10th Jubilee International Conference of the Balkan Physical Union. Author(s), 2019. http://dx.doi.org/10.1063/1.5091231.

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Císcar-Monsalvatje, Mar, Alejandro Ibarra, and Jérôme Vandecasteele. "The universe could be symmetric: dark matter stability and matter-antimatter asymmetry from baryon number conservation." In XVIII International Conference on Topics in Astroparticle and Underground Physics. Trieste, Italy: Sissa Medialab, 2024. http://dx.doi.org/10.22323/1.441.0007.

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Sakharov, Alexander. "Macroscopically large antimatter regions in the baryon asymmetric universe." In Cosmology and particle physics. AIP, 2001. http://dx.doi.org/10.1063/1.1363554.

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