Browsing by Subject "Causality"

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    Interdependence of the banking sector and the real sector: evidence from OECD countries
    (2008) Şendeniz-Yüncü, İ.; Akdeniz, L.; Aydoğan, K.
    This paper investigates the validity of the credit view hypothesis in eleven OECD countries over the period 1987:QI – 2003:QIII. The existence of a long-run relationship between the banking sector and the real sector is supported by cointegration test results. For some of the countries in the sample, Granger causality tests show the leading role of the banking sector in the real sector, thus supporting the credit view hypothesis, whereas for other countries, the same tests indicate no interdependence.
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    Nonlinear nexus between cryptocurrency returns and COVID-19 news sentiment
    (Elsevier, 2022-12) Banerjee, Ameet Kumar; Akhtaruzzaman, Md; Dionisio, Andreia; Almeida, Dora; Sensoy, Ahmet
    The paper examines how various COVID-19 news sentiments differentially impact the behaviour of cryptocurrency returns. We used a nonlinear technique of transfer entropy to investigate the relationship between the top 30 cryptocurrencies by market capitalisation and COVID-19 news sentiment. Results show that COVID-19 news sentiment influences cryptocurrency returns. The nexus is unidirectional from news sentiment to cryptocurrency returns, in contrast to past findings. These results have practical implications for policymakers and market participants in understanding cryptocurrency market dynamics under extremely stressful market conditions.
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    Quantum multipole radiation
    (John Wiley & Sons, 2001) Shumovsky, Alexander S.
    The author reviews investigations of the photon localization and quantum phase problems based on the use of the representation of multipole photons. Section II presents a general consideration of the field quantization, including a comparison of zero‐point oscillations of the plane and multipole waves of photons. Section III discusses the atom‐field interaction leading to the multipole radiation. The SU(2) quantum phase representation of atomic variables is considered, as is a connection between the SU(2) quantum phase states and entanglement phenomenon. In Section IV the author describes the quantum phase of multipole radiation caused by the angular momentum conservation in the process of radiation. This approach is compared with the Pegg–Barnett formalism and with Mandel's operational approach. Section V covers the quantum polarization properties of multipole radiation. Photon localization, quantum measurements, and causality are considered in Section VI.