39 research outputs found
A Statistical Study of Resistive Switching Parameters in Au/Ta/ZrO2(Y)/Ta2O5/TiN/Ti Memristive Devices
The authors acknowledge the ConsejerΓa de Conocimiento, InvestigaciΓ³n y
Universidad, Junta de AndalucΓa (Spain), European Regional Development
Fund (ERDF) under projects A-TIC-117-UGR18, B-TIC-624-UGR20, and
IE2017-5414. Support from the Government of the Russian Federation
under Megagrant Program (agreement no. 074-02-2018-330 (2)) and
the Ministry of Science and Higher Education of the Russian
Federation under βPriority-2030β Academic Excellence Program of the
Lobachevsky State University of Nizhny Novgorod (N-466-99_2021-
2023) is also acknowledged. Memristive devices were designed in the
frame of the scientific program of the National Center for Physics and
Mathematics (project βArtificial intelligence and big data in technical,
industrial, natural and social systemsβ).Variability is an inherent property of memristive devices based on the switching
of resistance in a simple metalβoxideβmetal structure compatible with the
standard complementary metalβoxideβsemiconductor fabrication process. For
each specific structure, the variability should be measured and assessed as both
the negative and positive factors for different applications of memristive devices.
In this report, it is shown how this variability can be extracted and analyzed for
such main parameters of resistive switching as the set and reset voltages/cur-
rents and how it depends on the methodology used and experimental conditions.
The obtained results should be taken into account in the design and predictive
simulation of memristive devices and circuits.ConsejerΓa de Conocimiento, InvestigaciΓ³n y Universidad, Junta de AndalucΓa (Spain), European Regional Development Fund (ERDF) under projects A-TIC-117-UGR18, B-TIC-624-UGR20, and IE2017-5414Government of the Russian Federation under Megagrant Program (agreement no. 074-02-2018-330 (2))Ministry of Science and Higher Education of the Russian Federation under βPriority-2030β Academic Excellence Program of the Lobachevsky State University of Nizhny Novgorod (N-466-99_2021- 2023
Nonlocal effective medium model for multilayered metal-dielectric metamaterials
We study layered metal-dielectric structures, which can be considered as a simple example of nanostructured metamaterials. We analyze the dispersion properties of such structures and demonstrate that they show strong optical nonlocality due to excitatio
Prothymosin Ξ± fragmentation in apoptosis
AbstractWe observed fragmentation of an essential proliferation-related human nuclear protein prothymosin Ξ± in the course of apoptosis induced by various stimuli. Prothymosin Ξ± cleavage occurred at the DDVD99 motif. In vitro, prothymosin Ξ± could be cleaved at D99 by caspase-3 and -7. Caspase hydrolysis disrupted the nuclear localization signal of prothymosin Ξ± and abrogated the ability of the truncated protein to accumulate inside the nucleus. Prothymosin Ξ± fragmentation may therefore be proposed to disable intranuclear proliferation-related function of prothymosin Ξ± in two ways: by cleaving off a short peptide containing important determinants, and by preventing active nuclear uptake of the truncated protein
ΠΡΠΎΠ³Π½ΠΎΡΡΠΈΡΠ΅ΡΠΊΠΈΠ΅ Π²ΠΎΠ·ΠΌΠΎΠΆΠ½ΠΎΡΡΠΈ ΠΠ’ Π² Π΄ΠΈΠ°Π³Π½ΠΎΡΡΠΈΠΊΠ΅ Ρ ΡΠΎΠ½ΠΈΡΠ΅ΡΠΊΠΈΡ Π²ΠΎΡΠΏΠ°Π»ΠΈΡΠ΅Π»ΡΠ½ΡΡ ΠΎΡΠ»ΠΎΠΆΠ½Π΅Π½ΠΈΠΉ Π΄ΠΈΠ²Π΅ΡΡΠΈΠΊΡΠ»ΡΡΠ½ΠΎΠΉ Π±ΠΎΠ»Π΅Π·Π½ΠΈ ΠΎΠ±ΠΎΠ΄ΠΎΡΠ½ΠΎΠΉ ΠΊΠΈΡΠΊΠΈ
Objective: to determine the diagnostic effectiveness of computed tomography (CT) in predicting the course of the disease in patients with chronic inflammatory complications of diverticular disease (DD).Material and methods. The study included 70 patients with a complicated course of colon diverticular disease in the phase of exacerbation of the chronic inflammatory process. All patients underwent CT of the abdominal cavity with intravenous contrast to assess the type and severity of inflammatory changes in the colon and surrounding tissues in the area of localization of diverticula. All patients received conservative treatment and were monitored as part of the ongoing study for 12 months from the moment of initial treatment at the Center. Surgical intervention due to the ineffectiveness of conservative therapy or the recurrence of the inflammatory process during the established follow-up period was considered as an unfavorable outcome of the disease (42/60%). The positive effect of drug therapy without signs of a return of the clinical picture of inflammation within 12 months was considered as a favorable outcome (28/40%). A statistical analysis of CT signs of inflammatory changes in various DD outcomes was performed to identify prognostic CT parameters.Results. Statistically significant differences were revealed between the severity of inflammatory changes according to CT data for different outcomes of the disease. In the favorable outcome group, the main part (23/28.82%) were patients with diverticulitis, in the unfavorable outcome group, 2/3 of patients (29/42.64%) were diagnosed with pericolic infiltrates, including abscesses/cavities, and colon fistulas. It was found that the thickness of the intestinal wall, the extent of inflammatory changes in the intestinal wall, the extent of inflammatory infiltration of pericolic fiber, the symptom of βcentipedeβ, the accumulation of fluid in the pericolic region statistically significantly differed with different outcomes of chronic inflammatory complications of diverticular disease. Πultivariate Cox proportional hazard model revealed two main predictors of the onset of an unfavorable outcome β thickening of the intestinal wall and the presence of fluid in the pericolic region. Thickening of the intestinal wall at values equal to or greater than 0,6 cm increased the risk of an unfavorable outcome by 4.69 times, and the presence of fluid by 4.52 times.Conclusion. The use in clinical practice of the revealed CT predictors of the onset of an unfavorable outcome in chronic inflammatory complications of DB can serve as one of the factors for deciding on elective surgery in this category of patients.Β Π¦Π΅Π»Ρ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΡ: ΠΎΠΏΡΠ΅Π΄Π΅Π»ΠΈΡΡ Π΄ΠΈΠ°Π³Π½ΠΎΡΡΠΈΡΠ΅ΡΠΊΡΡ ΡΡΡΠ΅ΠΊΡΠΈΠ²Π½ΠΎΡΡΡ ΠΊΠΎΠΌΠΏΡΡΡΠ΅ΡΠ½ΠΎΠΉ ΡΠΎΠΌΠΎΠ³ΡΠ°ΡΠΈΠΈ (ΠΠ’) Π² ΠΏΡΠΎΠ³Π½ΠΎΠ·ΠΈΡΠΎΠ²Π°Π½ΠΈΠΈ ΡΠ΅ΡΠ΅Π½ΠΈΡ Π·Π°Π±ΠΎΠ»Π΅Π²Π°Π½ΠΈΡ Ρ Π±ΠΎΠ»ΡΠ½ΡΡ
Ρ Ρ
ΡΠΎΠ½ΠΈΡΠ΅ΡΠΊΠΈΠΌΠΈ Π²ΠΎΡΠΏΠ°Π»ΠΈΡΠ΅Π»ΡΠ½ΡΠΌΠΈ ΠΎΡΠ»ΠΎΠΆΠ½Π΅Π½ΠΈΡΠΌΠΈ Π΄ΠΈΠ²Π΅ΡΡΠΈΠΊΡΠ»ΡΡΠ½ΠΎΠΉ Π±ΠΎΠ»Π΅Π·Π½ΠΈ (ΠΠ).ΠΠ°ΡΠ΅ΡΠΈΠ°Π» ΠΈ ΠΌΠ΅ΡΠΎΠ΄Ρ. Π ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΠ΅ Π²ΠΊΠ»ΡΡΠ΅Π½ΠΎ 70 ΠΏΠ°ΡΠΈΠ΅Π½ΡΠΎΠ² Ρ ΠΎΡΠ»ΠΎΠΆΠ½Π΅Π½Π½ΡΠΌ ΡΠ΅ΡΠ΅Π½ΠΈΠ΅ΠΌ ΠΠ ΠΎΠ±ΠΎΠ΄ΠΎΡΠ½ΠΎΠΉ ΠΊΠΈΡΠΊΠΈ Π² ΡΠ°Π·Ρ ΠΎΠ±ΠΎΡΡΡΠ΅Π½ΠΈΡ Ρ
ΡΠΎΠ½ΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ Π²ΠΎΡΠΏΠ°Π»ΠΈΡΠ΅Π»ΡΠ½ΠΎΠ³ΠΎ ΠΏΡΠΎΡΠ΅ΡΡΠ°. ΠΡΠ΅ΠΌ ΠΏΠ°ΡΠΈΠ΅Π½ΡΠ°ΠΌ Π²ΡΠΏΠΎΠ»Π½Π΅Π½Π° ΠΠ’ Π±ΡΡΡΠ½ΠΎΠΉ ΠΏΠΎΠ»ΠΎΡΡΠΈ Ρ Π²Π½ΡΡΡΠΈΠ²Π΅Π½Π½ΡΠΌ ΠΊΠΎΠ½ΡΡΠ°ΡΡΠΈΡΠΎΠ²Π°Π½ΠΈΠ΅ΠΌ Π΄Π»Ρ ΠΎΡΠ΅Π½ΠΊΠΈ Π²ΠΈΠ΄Π° ΠΈ ΡΡΠΆΠ΅ΡΡΠΈ Π²ΠΎΡΠΏΠ°Π»ΠΈΡΠ΅Π»ΡΠ½ΡΡ
ΠΈΠ·ΠΌΠ΅Π½Π΅Π½ΠΈΠΉ ΠΎΠ±ΠΎΠ΄ΠΎΡΠ½ΠΎΠΉ ΠΊΠΈΡΠΊΠΈ ΠΈ ΠΎΠΊΡΡΠΆΠ°ΡΡΠΈΡ
ΡΠΊΠ°Π½Π΅ΠΉ Π² ΠΎΠ±Π»Π°ΡΡΠΈ Π»ΠΎΠΊΠ°Π»ΠΈΠ·Π°ΡΠΈΠΈ Π΄ΠΈΠ²Π΅ΡΡΠΈΠΊΡΠ»ΠΎΠ². ΠΡΠ΅ ΠΏΠ°ΡΠΈΠ΅Π½ΡΡ ΠΏΠΎΠ»ΡΡΠΈΠ»ΠΈ ΠΊΠΎΠ½ΡΠ΅ΡΠ²Π°ΡΠΈΠ²Π½ΠΎΠ΅ Π»Π΅ΡΠ΅Π½ΠΈΠ΅ ΠΈ Π½Π°Ρ
ΠΎΠ΄ΠΈΠ»ΠΈΡΡ ΠΏΠΎΠ΄ Π½Π°Π±Π»ΡΠ΄Π΅Π½ΠΈΠ΅ΠΌ Π² ΡΠ°ΠΌΠΊΠ°Ρ
ΠΏΡΠΎΠ²ΠΎΠ΄ΠΈΠΌΠΎΠ³ΠΎ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΡ Π² ΡΠ΅ΡΠ΅Π½ΠΈΠΈ 12 ΠΌΠ΅Ρ Ρ ΠΌΠΎΠΌΠ΅Π½ΡΠ° ΠΏΠ΅ΡΠ²ΠΈΡΠ½ΠΎΠ³ΠΎ ΠΎΠ±ΡΠ°ΡΠ΅Π½ΠΈΡ Π² Π¦Π΅Π½ΡΡ. ΠΠΏΠ΅ΡΠ°ΡΠΈΠ²Π½ΠΎΠ΅ Π²ΠΌΠ΅ΡΠ°ΡΠ΅Π»ΡΡΡΠ²ΠΎ Π² ΡΠ²ΡΠ·ΠΈ Ρ Π½Π΅ΡΡΡΠ΅ΠΊΡΠΈΠ²Π½ΠΎΡΡΡΡ ΠΊΠΎΠ½ΡΠ΅ΡΠ²Π°ΡΠΈΠ²Π½ΠΎΠΉ ΡΠ΅ΡΠ°ΠΏΠΈΠΈ ΠΈΠ»ΠΈ ΡΠ΅ΡΠΈΠ΄ΠΈΠ²ΠΎΠΌ Π²ΠΎΡΠΏΠ°Π»ΠΈΡΠ΅Π»ΡΠ½ΠΎΠ³ΠΎ ΠΏΡΠΎΡΠ΅ΡΡΠ° Π² ΡΡΡΠ°Π½ΠΎΠ²Π»Π΅Π½Π½ΡΠΉ ΠΏΠ΅ΡΠΈΠΎΠ΄ Π½Π°Π±Π»ΡΠ΄Π΅Π½ΠΈΡ ΡΠ°ΡΡΠΌΠ°ΡΡΠΈΠ²Π°Π»ΠΎΡΡ ΠΊΠ°ΠΊ Π½Π΅Π±Π»Π°Π³ΠΎΠΏΡΠΈΡΡΠ½ΡΠΉ ΠΈΡΡ
ΠΎΠ΄ Π·Π°Π±ΠΎΠ»Π΅Π²Π°Π½ΠΈΡ (42/60%). ΠΠΎΠ»ΠΎΠΆΠΈΡΠ΅Π»ΡΠ½ΡΠΉ ΡΡΡΠ΅ΠΊΡ Π»Π΅ΠΊΠ°ΡΡΡΠ²Π΅Π½Π½ΠΎΠΉ ΡΠ΅ΡΠ°ΠΏΠΈΠΈ Π±Π΅Π· ΠΏΡΠΈΠ·Π½Π°ΠΊΠΎΠ² Π²ΠΎΠ·Π²ΡΠ°ΡΠ° ΠΊΠ»ΠΈΠ½ΠΈΡΠ΅ΡΠΊΠΎΠΉ ΠΊΠ°ΡΡΠΈΠ½Ρ Π²ΠΎΡΠΏΠ°Π»Π΅Π½ΠΈΡ Π² ΡΠ΅ΡΠ΅Π½ΠΈΠ΅ 12 ΠΌΠ΅Ρ ΡΠ°ΡΡΠΌΠ°ΡΡΠΈΠ²Π°Π»ΡΡ ΠΊΠ°ΠΊ Π±Π»Π°Π³ΠΎΠΏΡΠΈΡΡΠ½ΡΠΉ ΠΈΡΡ
ΠΎΠ΄ (28/40%). ΠΡΠΎΠ²Π΅Π΄Π΅Π½ ΡΡΠ°ΡΠΈΡΡΠΈΡΠ΅ΡΠΊΠΈΠΉ Π°Π½Π°Π»ΠΈΠ· ΠΠ’-ΠΏΡΠΈΠ·Π½Π°ΠΊΠΎΠ² Π²ΠΎΡΠΏΠ°Π»ΠΈΡΠ΅Π»ΡΠ½ΡΡ
ΠΈΠ·ΠΌΠ΅Π½Π΅Π½ΠΈΠΉ ΠΏΡΠΈ ΡΠ°Π·Π»ΠΈΡΠ½ΡΡ
ΠΈΡΡ
ΠΎΠ΄Π°Ρ
ΠΠ Π΄Π»Ρ Π²ΡΡΠ²Π»Π΅Π½ΠΈΡ ΠΏΡΠΎΠ³Π½ΠΎΡΡΠΈΡΠ΅ΡΠΊΠΈΡ
ΠΠ’-ΠΏΠ°ΡΠ°ΠΌΠ΅ΡΡΠΎΠ².Π Π΅Π·ΡΠ»ΡΡΠ°ΡΡ. ΠΡΡΠ²Π»Π΅Π½Ρ ΡΡΠ°ΡΠΈΡΡΠΈΡΠ΅ΡΠΊΠΈ Π·Π½Π°ΡΠΈΠΌΡΠ΅ ΡΠ°Π·Π»ΠΈΡΠΈΡ ΠΌΠ΅ΠΆΠ΄Ρ Π²ΡΡΠ°ΠΆΠ΅Π½Π½ΠΎΡΡΡΡ Π²ΠΎΡΠΏΠ°Π»ΠΈΡΠ΅Π»ΡΠ½ΡΡ
ΠΈΠ·ΠΌΠ΅Π½Π΅Π½ΠΈΠΉ ΠΏΠΎ Π΄Π°Π½Π½ΡΠΌ ΠΠ’ ΠΏΡΠΈ ΡΠ°Π·Π»ΠΈΡΠ½ΡΡ
ΠΈΡΡ
ΠΎΠ΄Π°Ρ
Π·Π°Π±ΠΎΠ»Π΅Π²Π°Π½ΠΈΡ. Π Π³ΡΡΠΏΠΏΠ΅ Π±Π»Π°Π³ΠΎΠΏΡΠΈΡΡΠ½ΠΎΠ³ΠΎ ΠΈΡΡ
ΠΎΠ΄Π° ΠΎΡΠ½ΠΎΠ²Π½ΡΡ ΡΠ°ΡΡΡ (23/28,82%) ΡΠΎΡΡΠ°Π²ΠΈΠ»ΠΈ ΠΏΠ°ΡΠΈΠ΅Π½ΡΡ Ρ Π΄ΠΈΠ²Π΅ΡΡΠΈΠΊΡΠ»ΠΈΡΠΎΠΌ, Β Π² Π³ΡΡΠΏΠΏΠ΅ Π½Π΅Π±Π»Π°Π³ΠΎΠΏΡΠΈΡΡΠ½ΠΎΠ³ΠΎ ΠΈΡΡ
ΠΎΠ΄Π° Ρ 2/3 Π±ΠΎΠ»ΡΠ½ΡΡ
(29/42,64%) Π΄ΠΈΠ°Π³Π½ΠΎΡΡΠΈΡΠΎΠ²Π°Π½Ρ ΠΏΠ°ΡΠ°ΠΊΠΈΡΠ΅ΡΠ½ΡΠ΅ ΠΈΠ½ΡΠΈΠ»ΡΡΡΠ°ΡΡ, Π² ΡΠΎΠΌ ΡΠΈΡΠ»Π΅ Ρ Π°Π±ΡΡΠ΅ΡΡΠ°ΠΌΠΈ/ΠΏΠΎΠ»ΠΎΡΡΡΠΌΠΈ, ΠΈ ΡΠ²ΠΈΡΠΈ ΠΎΠ±ΠΎΠ΄ΠΎΡΠ½ΠΎΠΉ ΠΊΠΈΡΠΊΠΈ. Π£ΡΡΠ°Π½ΠΎΠ²Π»Π΅Π½ΠΎ, ΡΡΠΎ ΡΠΎΠ»ΡΠΈΠ½Π° ΠΊΠΈΡΠ΅ΡΠ½ΠΎΠΉ ΡΡΠ΅Π½ΠΊΠΈ, ΠΏΡΠΎΡΡΠΆΠ΅Π½Π½ΠΎΡΡΡ Π²ΠΎΡΠΏΠ°Π»ΠΈΡΠ΅Π»ΡΠ½ΡΡ
ΠΈΠ·ΠΌΠ΅Π½Π΅Π½ΠΈΠΉ ΠΊΠΈΡΠ΅ΡΠ½ΠΎΠΉ ΡΡΠ΅Π½ΠΊΠΈ, ΠΏΡΠΎΡΡΠΆΠ΅Π½Π½ΠΎΡΡΡ Π²ΠΎΡΠΏΠ°Π»ΠΈΡΠ΅Π»ΡΠ½ΠΎΠΉ ΠΈΠ½ΡΠΈΠ»ΡΡΡΠ°ΡΠΈΠΈ ΠΏΠ΅ΡΠΈΠΊΠΎΠ»ΠΈΡΠ΅ΡΠΊΠΎΠΉ ΠΊΠ»Π΅ΡΡΠ°ΡΠΊΠΈ, ΡΠΈΠΌΠΏΡΠΎΠΌ βΡΠΎΡΠΎΠΊΠΎΠ½ΠΎΠΆΠΊΠΈβ, ΡΠΊΠΎΠΏΠ»Π΅Π½ΠΈΠ΅ ΠΆΠΈΠ΄ΠΊΠΎΡΡΠΈ Π² ΠΏΠ΅ΡΠΈΠΊΠΎΠ»ΠΈΡΠ΅ΡΠΊΠΎΠΉ ΠΎΠ±Π»Π°ΡΡΠΈ ΡΡΠ°ΡΠΈΡΡΠΈΡΠ΅ΡΠΊΠΈ Π·Π½Π°ΡΠΈΠΌΠΎ ΡΠ°Π·Π»ΠΈΡΠ°Π»ΠΈΡΡ ΠΏΡΠΈ ΡΠ°Π·Π½ΡΡ
ΠΈΡΡ
ΠΎΠ΄Π°Ρ
Ρ
ΡΠΎΠ½ΠΈΡΠ΅ΡΠΊΠΈΡ
Π²ΠΎΡΠΏΠ°Π»ΠΈΡΠ΅Π»ΡΠ½ΡΡ
ΠΎΡΠ»ΠΎΠΆΠ½Π΅Π½ΠΈΠΉ ΠΠ. ΠΠ½ΠΎΠ³ΠΎΡΠ°ΠΊΡΠΎΡΠ½ΡΠΉ ΠΠΎΠΊΡ-ΡΠ΅Π³ΡΠ΅ΡΡΠΈΠΎΠ½Π½ΡΠΉ Π°Π½Π°Π»ΠΈΠ· Π²ΡΡΠ²ΠΈΠ» Π΄Π²Π° ΠΎΡΠ½ΠΎΠ²Π½ΡΡ
ΠΏΡΠ΅Π΄ΠΈΠΊΡΠΎΡΠ°Β Π½Π°ΡΡΡΠΏΠ»Π΅Π½ΠΈΡ Π½Π΅Π±Π»Π°Π³ΠΎΠΏΡΠΈΡΡΠ½ΠΎΠ³ΠΎ ΠΈΡΡ
ΠΎΠ΄Π° β ΡΡΠΎΠ»ΡΠ΅Π½ΠΈΠ΅ ΠΊΠΈΡΠ΅ΡΠ½ΠΎΠΉ ΡΡΠ΅Π½ΠΊΠΈ ΠΈ Π½Π°Π»ΠΈΡΠΈΠ΅ ΠΆΠΈΠ΄ΠΊΠΎΡΡΠΈ Π² ΠΏΠ΅ΡΠΈΠΊΠΎΠ»ΠΈΡΠ΅ΡΠΊΠΎΠΉ ΠΎΠ±Π»Π°ΡΡΠΈ. Π£ΡΠΎΠ»ΡΠ΅Π½ΠΈΠ΅ ΠΊΠΈΡΠ΅ΡΠ½ΠΎΠΉ ΡΡΠ΅Π½ΠΊΠΈ ΠΏΡΠΈ Π·Π½Π°ΡΠ΅Π½ΠΈΡΡ
, ΡΠ°Π²Π½ΡΡ
ΠΈΠ»ΠΈ Π±ΠΎΠ»Π΅Π΅ 0,6 ΡΠΌ, Π² 4,69 ΡΠ°Π·Π° ΡΠ²Π΅Π»ΠΈΡΠΈΠ²Π°Π»ΠΎ ΡΠΈΡΠΊ Π½Π°ΡΡΡΠΏΠ»Π΅Π½ΠΈΡ Π½Π΅Π±Π»Π°Π³ΠΎΠΏΡΠΈΡΡΠ½ΠΎΠ³ΠΎ ΠΈΡΡ
ΠΎΠ΄Π°, Π° Π½Π°Π»ΠΈΡΠΈΠ΅ ΠΆΠΈΠ΄ΠΊΠΎΡΡΠΈ Π² 4,52 ΡΠ°Π·Π°.ΠΠ°ΠΊΠ»ΡΡΠ΅Π½ΠΈΠ΅. ΠΡΠΈΠΌΠ΅Π½Π΅Π½ΠΈΠ΅ Π² ΠΊΠ»ΠΈΠ½ΠΈΡΠ΅ΡΠΊΠΎΠΉ ΠΏΡΠ°ΠΊΡΠΈΠΊΠ΅ Π²ΡΡΠ²Π»Π΅Π½Π½ΡΡ
ΠΠ’-ΠΏΡΠ΅Π΄ΠΈΠΊΡΠΎΡΠΎΠ² Π½Π°ΡΡΡΠΏΠ»Π΅Π½ΠΈΡ Π½Π΅Π±Π»Π°Π³ΠΎΠΏΡΠΈΡΡΠ½ΠΎΠ³ΠΎ ΠΈΡΡ
ΠΎΠ΄Π° ΠΏΡΠΈ Ρ
ΡΠΎΠ½ΠΈΡΠ΅ΡΠΊΠΈΡ
Π²ΠΎΡΠΏΠ°Π»ΠΈΡΠ΅Π»ΡΠ½ΡΡ
ΠΎΡΠ»ΠΎΠΆΠ½Π΅Π½ΠΈΡΡ
ΠΠ ΠΌΠΎΠΆΠ΅Ρ ΠΏΠΎΡΠ»ΡΠΆΠΈΡΡ ΠΎΠ΄Π½ΠΈΠΌ ΠΈΠ· ΡΠ°ΠΊΡΠΎΡΠΎΠ² Π΄Π»Ρ ΠΏΡΠΈΠ½ΡΡΠΈΡ ΡΠ΅ΡΠ΅Π½ΠΈΡ ΠΎ ΠΏΠ»Π°Π½ΠΎΠ²ΠΎΠΌ Ρ
ΠΈΡΡΡΠ³ΠΈΡΠ΅ΡΠΊΠΎΠΌ Π²ΠΌΠ΅ΡΠ°ΡΠ΅Π»ΡΡΡΠ²Π΅ Ρ ΡΡΠΎΠΉ ΠΊΠ°ΡΠ΅Π³ΠΎΡΠΈΠΈ ΠΏΠ°ΡΠΈΠ΅Π½ΡΠΎΠ²
Analysis of scalar perturbations in cosmological models with a non-local scalar field
We develop the cosmological perturbations formalism in models with a single
non-local scalar field originating from the string field theory description of
the rolling tachyon dynamics. We construct the equation for the energy density
perturbations of the non-local scalar field in the presence of the arbitrary
potential and formulate the local system of equations for perturbations in the
linearized model when both simple and double roots of the characteristic
equation are present. We carry out the general analysis related to the
curvature and entropy perturbations and consider the most specific example of
perturbations when important quantities in the model become complex.Comment: LaTeX, 25 pages, 1 figure, v2: Subsection 3.2 and Section 5 added,
references added, accepted for publication in Class. Quant. Grav. arXiv admin
note: text overlap with arXiv:0903.517