Andrei Tsygankov: “The US establishment, not the Kremlin, is undermining normalisation with Russia”

The release of an intelligence report on Russian interference in the US presidential election, alongside allegations of links between Donald Trump and the Kremlin, have strained US-Russia relations. Andrei P. Tsygankov argues that there remains a deep-rooted fear of Russia within the American establishment, but that Donald Trump’s election provides an opportunity for the two countries to normalise their relations

Nobody loves Russia: how western media have perpetuated the myth of Putin’s ‘neo-Soviet autocracy’

Russia’s political system has frequently been criticised by Western politicians and commentators, with some observers drawing parallels between the rule of Vladimir Putin and the old Soviet regime during the communist-era. But how accurate are these criticisms? Andrei P. Tsygankov writes that a particular narrative which views Russia as a ‘neo-Soviet autocracy’ has built up in western media sources. He argues that this narrative ignores the reality of Putin’s regime and serves simply to legitimise the identity of the United States and the American-led ‘free world’ relative to that of an ‘oppressive’ Russia

Why Russia’s ‘strong state’ political system still remains a better option for the country than western-style democracy

Russia’s political system has often been criticised by commentators and academics who advocate a transition to a more western-style of democracy. Andrei P. Tsygankov argues that while the Russian system under Vladimir Putin undoubtedly requires substantial reforms, the ‘strong state’ model adopted in the country also generates a number of benefits for Russian citizens that have largely been overlooked in the West. He writes that abandoning this model in favour of a western political system would be at odds with the prevailing conditions within the country and that the aim should instead be to reform the existing system so that it works more effectively for ordinary Russians

An upper limit on nickel overabundance in the supercritical accretion disk wind of SS 433 from X-ray spectroscopy

We take advantage of a long (with a total exposure time of 120 ks) X-ray observation of the unique Galactic microquasar SS 433, carried out with the XMM-Newton space observatory, to search for a fluorescent line of neutral (or weakly ionized) nickel at the energy 7.5 keV. We consider two models of the formation of fluorescent lines in the spectrum of SS 433: 1) due to reflection of hard X-ray radiation from a putative central source on the optically thick walls of the accretion disk "funnel"; and 2) due to scattering of the radiation coming from the hottest parts of the jets in the optically thin wind of the system. It is shown, that for these cases, the photon flux of Ni I K$_{\alpha}$ fluorescent line is expected to be 0.45 of the flux of Fe I K$_{\alpha}$ fluorescent line at 6.4 keV, for the relative nickel overabundance $Z_{Ni}/Z = 10$, as observed in the jets of SS 433. For the continuum model without the absorption edge of neutral iron, we set a 90 per cent upper limit on the flux of the narrow Ni I K$_{\alpha}$ line at the level of $0.9 \times 10^{-5}$ ph s$^{-1}$ cm$^{-2}$. For the continuum model with the absorption edge, the corresponding upper limit is $2.5 \times 10^{-5}$ ph s$^{-1}$ cm$^{-2}$. At the same time, for the Fe I K$_{\alpha}$ line, we measure the flux of $9.9_{8.4}^{11.2} \times 10^{-5}$ ph s$^{-1}$ cm$^{-2}$. Taken at the face value, the results imply that the relative overabundance of nickel in the wind of the accretion disc should be at least 1.5 times less than the corresponding excess of nickel observed in the jets of SS 433.Comment: 17 pages, 12 figures, 4 tables, Astronomy Letters, in press, 2018, Volume 44, Issue

Western civilizational biases, see Hoffmann

This article addresses the question of interaction between Western and ''non-Western'' international relations (IR) by analyzing liberal theory of IR that is emerging in contemporary Russia. We argue that, despite a growing diversity within Russian scholarship of liberal orientation, it remains largely a product of Western, particularly American, intellectual hegemony, and more so than any other theoretical perspective. As compared to two other existing traditions in Russian IR-realism and critical studies-liberalism remains the most dependent and therefore must be explored before any other traditions as a crucial case for understanding the dialectic of cultural dependence and hegemony in production of global knowledge. We argue that the greater dependence of Russian liberal IR results from its relatively weak indigenous tradition, perception of Russia's material weakness as opportunity, and greater availability of Western research funds. We also discuss an alternative, less dependent version of Russian liberal IR, and opportunities that its existence implies for development of a global, de-centered international relations theory. Scholars do not like to think about their intellectual dependence on the status of their country, and on ambitions of its political elites; it disturbs their sense of belonging to a cosmopolitan, free-floating community of science … And yet, the link exists. And it is sometimes reinforced by institutional arrangements. Stanley Hoffmann (1995: 225) Western scholars can improve their understanding of the world by studying international relations (IR) as a discipline outside the West. For a long time, international relations have been developing as an excessively West-centric and pro-Western branch of research. As many scholars pointed out, IR all too often reflects political, ideological, and epistemological biases of Western, particularly American, civilization. 1 As a result, a perception has arisen throughout the world 1 For various analyses of international relations as a discipline that is ethnocentric and reflects American

Stable accretion from a cold disc in highly magnetized neutron stars

The aim of this paper is to investigate the transition of a strongly magnetized neutron star into the accretion regime with very low accretion rate. For this purpose we monitored the Be-transient X-ray pulsar GRO J1008-57 throughout a full orbital cycle. The current observational campaign was performed with the Swift/XRT telescope in the soft X-ray band (0.5-10 keV) between two subsequent Type I outbursts in January and September 2016. The expected transition to the propeller regime was not observed. However, the transitions between different regimes of accretion were detected. In particular, after an outburst the source entered a stable accretion state characterised by the accretion rate of ~10^14-10^15 g/s. We associate this state with accretion from a cold (low-ionised) disc of temperature below ~6500 K. We argue that a transition to such accretion regime should be observed in all X-ray pulsars with certain combination of the rotation frequency and magnetic field strength. The proposed model of accretion from a cold disc is able to explain several puzzling observational properties of X-ray pulsars.Comment: 8 pages, 3 figures, 1 table, accepted by A&

Expanding hot flow in the black hole binary SWIFT J1753.5-0127: evidence from optical timing

We describe the evolution of optical and X-ray temporal characteristics during the outburst decline of the black hole X-ray binary SWIFT J1753.5-0127. The optical/X-ray cross-correlation function demonstrates a single positive correlation at the outburst peak, then it has multiple dips and peaks during the decline stage, which are then replaced by the precognition dip plus peak structure in the outburst tail. Power spectral densities and phase lags show a complex evolution, revealing the presence of intrinsically connected optical and X-ray quasi-periodic oscillations. For the first time, we quantitatively explain the evolution of these timing properties during the entire outburst within one model, the essence of which is the expansion of the hot accretion flow towards the tail of the outburst. The pivoting of the spectrum produced by synchrotron Comptonization in the hot flow is responsible for the appearance of the anti-correlation with the X-rays and for the optical quasi-periodic oscillations. Our model reproduces well the cross-correlation and phase lag spectrum during the decline stage, which could not be understood with any model proposed before.Comment: 13 pages, 11 figures, MNRAS submitte

Spectral Formation in Accreting X-Ray Pulsars: Bimodal Variation of the Cyclotron Energy with Luminosity

Accretion-powered X-ray pulsars exhibit significant variability of the Cyclotron Resonance Scattering Feature (CRSF) centroid energy on pulse-to-pulse timescales, and also on much longer timescales. Two types of spectral variability are observed. For sources in group 1, the CRSF energy is negatively correlated with the variable source luminosity, and for sources in group 2, the opposite behavior is observed. The physical basis for this bimodal behavior is currently not understood. We explore the hypothesis that the accretion dynamics in the group 1 sources is dominated by radiation pressure near the stellar surface, and that Coulomb interactions decelerate the gas to rest in the group 2 sources. We derive a new expression for the critical luminosity such that radiation pressure decelerates the matter to rest in the supercritical sources. The formula for the critical luminosity is evaluated for 5 sources, using the maximum value of the CRSF centroid energy to estimate the surface magnetic field strength. The results confirm that the group 1 sources are supercritical and the group 2 sources are subcritical, although the situation is less clear for those highly variable sources that cross over the critical line. We also explain the variation of the CRSF energy with luminosity as a consequence of the variation of the characteristic emission height. The sign of the height variation is opposite in the supercritical and subcritical cases, hence creating the observed bimodal behavior.Comment: Accepted for publication in Astronomy & Astrophysic