scholarly journals Laser-assisted kaon decay and CPT symmetry violation

2021 ◽  
Vol 18 (10) ◽  
pp. 106001
Author(s):  
M Baouahi ◽  
M Ouali ◽  
M Jakha ◽  
S Mouslih ◽  
Y Attaourti ◽  
...  
Symmetry ◽  
2020 ◽  
Vol 12 (12) ◽  
pp. 2063
Author(s):  
Antonio Di Domenico

The neutral kaon system is a very peculiar system that offers unique possibilities to perform precise tests of the CPT symmetry. The entanglement of neutral kaon pairs that are produced at a ϕ-factory opens up new ways and scenarios in order to test this fundamental discrete symmetry. In this paper, the results of the most recent and significant CPT tests are reviewed. Experiments have set stringent limits on the CPT-violating parameters of different phenomenological models, some of them associated to possible decoherence mechanisms or Lorentz symmetry violation which might be justified in a quantum gravity framework. The present results show no violation of CPT symmetry, while their accuracy in some cases reaches the interesting level at which–in the most optimistic scenarios–quantum gravity effects might show up.


Universe ◽  
2022 ◽  
Vol 8 (1) ◽  
pp. 42
Author(s):  
Celio A. Moura ◽  
Fernando Rossi-Torres

Neutrinos are a powerful tool for searching physics beyond the standard model of elementary particles. In this review, we present the status of the research on charge-parity-time (CPT) symmetry and Lorentz invariance violations using neutrinos emitted from the collapse of stars such as supernovae and other astrophysical environments, such as gamma-ray bursts. Particularly, supernova neutrino fluxes may provide precious information because all neutrino and antineutrino flavors are emitted during a burst of tens of seconds. Models of quantum gravity may allow the violation of Lorentz invariance and possibly of CPT symmetry. Violation of Lorentz invariance may cause a modification of the dispersion relation and, therefore, in the neutrino group velocity as well in the neutrino wave packet. These changes can affect the arrival time signal registered in astrophysical neutrino detectors. Direction or time-dependent oscillation probabilities and anisotropy of the neutrino velocity are manifestations of the same kind of new physics. CPT violation, on the other hand, may be responsible for different oscillation patterns for neutrino and antineutrino and unconventional energy dependency of the oscillation phase or of the mixing angles. Future perspectives for possible CPT and Lorentz violating systems are also presented.


2019 ◽  
Vol 79 (11) ◽  
Author(s):  
K. Simonov ◽  
A. Capolupo ◽  
S. M. Giampaolo

Abstract We study the probability oscillations of mixed particles in the presence of self gravitational interaction. We show that the presence of the parity leads to the violation of the time-reversal symmetry while the CP-symmetry is preserved hence inducing a CPT-symmetry violation. This violation is directly associated to the rising of the entanglement among the elements of the system that can be seen as a pure many-body effect scaling with the number of the elements in the system. This effect could have played a relevant role in the first stages of the universe or in core of very dense systems. Experiments based on Rydberg atoms confined in microtraps can simulate the mixing and the mutual interaction, and could allow to test the mechanism here presented.


2018 ◽  
Vol 13 (13) ◽  
pp. 100-113
Author(s):  
Y.V., Netsvitay T. V. Tararoev

Background. Goals In recent years, there is a growing interest in musical thinking, which is a key element of musicology and music philosophy, since music is a conscious, mental activity of a person and understanding the mechanisms of this activity, we can signifi cantly expand and deepen our understanding of music. The purpose of this study is to defi ne and supplement and clarify the concept of M. G. Aranovsky musical thinking our author’s approach, concretizing and clarifying the methodological and heuristic function of symmetry in musical thinking and its anthropological content. The work uses methods of comparison, analysis and synthesis. Musical thinking manifests itself in three forms of basic musical activity - composing, performing, listening, to which we also add theoretical (research) and pedagogical They are based on the processes of musical thinking and the fulfi llment of certain goals: the creation of an artifact, interpretation, reproduction, perception, analysis and theoretical understanding. The three spheres of realization of musical thinking are emotional-sensual, rational-logical and textual, semantic. These forms are closely intertwined and function on the basis of musical language, which is the foundation of any musical creative activity. The direct interaction of music and rationality is displayed in terms of “musical logic” and “architectonic musical ear”. Logic is the science of the most common laws of thought. These laws of thinking are expressed in the most abstract forms, patterns, rules that can be interpreted as conformity of something to specifi c norms, patterns. With regard to music, logic implies following certain standards and rules. Since the rational principle in music is closely associated with the irrational unconscious, the common logical norms that have been formed in a certain historical epoch within the framework of the dominant system of musical language are refracted through the individual stylistic features of the composer. A specifi c type of thinking - musical - generates the corresponding type of logic. Therefore, it is possible to express musical thinking by the sum of concepts - musical logic, musical speech and semantics of musical speech. M. G. Aranovsky identifi es four layers of musical logic: combinatorial, linguistic, contextual and artistic, i.e. those aspects (levels, edges) of the creative activity of a musician, in which there is logic. The lowest and at the same time fundamental level of musical logic is combinatorial, it is the sphere of primary elementary logical combinations of the simplest elements. However, the logic of this level extends to all scales of structures, from small motive links to sections of a one-part form. M. G. Aranovsky proposes to distinguish three types of logical combinations: 1. Identical - based on a constant repetition of structural units, where the formed elements are identical with each other (for example, AAAAAA). In terms of symmetry, this is a transformation of a simple movement along the time axis. It can again be noted as the simplest type of isomorphism, where only one characteristic changes - temporary. If we exclude it from consideration, then we can say that this is a “degenerate case” of isomorphism, which is an automorphism. 2. Equivalent - based on the modifi ed version of the repetition, in which there are both similarities and differences, i.e. incomplete identity is formed (for example, A1A2A3A4). From the point of view of symmetry, this combination of sequences represents the “unity” of the operation of symmetry, movement and violation of symmetry as such, i.e. in this sequence, some properties are repeated, while others change. This temporal process can be represented as isomorphism in the proper sense of the word, when some elements remain identical, while others change, and in general the objects are different, but similar. 3. Alternative - a combination of sequences of different units with complete exclusion of formal or obvious similarity (for example, ABC). Through symmetric transformations, this kind of logical combinations of primary elements can be described as an even greater symmetry violation, which preserves only the general “sequence of elements”, i.e. a small number of common properties, while these elements themselves are significantly different from each other. In this case, one can speak of a deep “transformation” of isomorphism, which can be called “metamorphism” (gr. Metamorphoómai - transformation of form). The basis of this transformation is a violation of the original symmetry in such a way that much more properties change than in the case of isomorphism. It can be schematically represented as A1 → B, A2 → C, etc. Thus, metamorphism can be considered both as a similarity, which has undergone a rather strong transformation, and as a symmetry violation, leading to a signifi cant complication of the structure. Thus, the result of this study is the position that, from the point of view of M. G. Aranowsky, the temporal process is the basis of musical thinking. The built-up chain “temporal process → musical logic → musical thinking” is the anthropological specifi city of human thought (in the musical sphere) associated with temporal processes in which a person is “immersed” and from which he cannot “exit” under any circumstances. Findings. we conclude that this chain can be called the “temporal-anthropological triad”. It represents the sequence “automorphism → isomorphism → metamorphism”. Each of its stages is different from the previous increase in the level of complexity. Of particular interest is the transition from isomorphism to metamorphism, since it is associated with the process of symmetry breaking. The mechanisms and principles of this disorder need further investigation.


2008 ◽  
Vol 483 (3) ◽  
pp. 715-718 ◽  
Author(s):  
J.-Q. Xia ◽  
H. Li ◽  
X. Wang ◽  
X. Zhang
Keyword(s):  

2013 ◽  
Vol 22 (12) ◽  
pp. 1330030 ◽  
Author(s):  
GAETANO LAMBIASE ◽  
SUBHENDRA MOHANTY ◽  
ARAGAM R. PRASANNA

In this paper, we review the theories of origin of matter–antimatter asymmetry in the universe. The general conditions for achieving baryogenesis and leptogenesis in a CPT conserving field theory have been laid down by Sakharov. In this review, we discuss scenarios where a background scalar or gravitational field spontaneously breaks the CPT symmetry and splits the energy levels between particles and antiparticles. Baryon or Lepton number violating processes in proceeding at thermal equilibrium in such backgrounds gives rise to Baryon or Lepton number asymmetry.


1982 ◽  
Vol 115 (3) ◽  
pp. 171-173 ◽  
Author(s):  
L.N. Bogdanova ◽  
V.E. Markushin ◽  
V.S. Melezhik ◽  
L.I. Ponomarev

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