Phantom inflation and the "Big Trip"

Primordial inflation is regarded to be driven by a phantom field which is here implemented as a scalar field satisfying an equation of state $p=\omega\rho$, with $\omega<-1$. Being even aggravated by the weird properties of phantom energy, this will pose a serious problem with the exit from the inflationary phase. We argue however in favor of the speculation that a smooth exit from the phantom inflationary phase can still be tentatively recovered by considering a multiverse scenario where the primordial phantom universe would travel in time toward a future universe filled with usual radiation, before reaching the big rip. We call this transition the "big trip" and assume it to take place with the help of some form of anthropic principle which chooses our current universe as being the final destination of the time transition.Comment: 23 pages, 5 figures, LaTex, Phys. Lett. B (in press

Powerful Radio Sources in the Southern Sky. II. A Swift X-Ray Perspective

We recently constructed the G4Jy-3CRE, a catalog of extragalactic radio sources based on the GLEAM 4-Jy (G4Jy) sample, with the aim of increasing the number of powerful radio galaxies and quasars with similar selection criteria to those of the revised release of the Third Cambridge Catalog (3CR). The G4Jy-3CRE consists of a total of 264 radio sources mainly visible from the Southern Hemisphere. Here, we present an initial X-ray analysis of 89 G4Jy-3CRE radio sources with archival X-ray observations from the Neil Gehrels Swift Observatory. We reduced a total of 624 Swift observations, for about 0.9 Ms of integrated exposure time. We found X-ray counterparts for 59 radio sources belonging to the G4Jy-3CRE, nine of them showing extended X-ray emission. The remaining 30 sources do not show any X-ray emission associated with their radio cores. Our analysis demonstrates that X-ray snapshot observations, even if lacking uniform exposure times, as those carried out with Swift, allow us to (i) verify and/or refine the host galaxy identification; (ii) discover the extended X-ray emission around radio galaxies of the intracluster medium when harbored in galaxy clusters, as the case of G4Jy 1518 and G4Jy 1664; and (iii) detect X-ray radiation arising from their radio lobes, as for G4Jy 1863

Powerful Radio Sources in the Southern Sky. I. Optical Identifications

Since the early sixties, our view of radio galaxies and quasars has been drastically shaped by discoveries made thanks to observations of radio sources listed in the Third Cambridge Catalog and its revised version (3CR). However, the largest fraction of data collected to date on 3CR sources was performed with relatively old instruments, rarely repeated and/or updated. Importantly, the 3CR contains only objects located in the Northern Hemisphere, thus having limited access to new and innovative astronomical facilities. To mitigate these limitations, we present a new catalog of powerful radio sources visible from the Southern Hemisphere, extracted from the GLEAM 4 Jy (G4Jy) catalog and based on equivalent selection criteria as the 3CR. This new catalog, named G4Jy-3CRE, where the E stands for equivalent, lists a total of 264 sources at decl. below −5° and with 9 Jy limiting sensitivity at ∼178 MHz. We explored archival radio maps obtained with different surveys and compared them with optical images available in the Pan-STARRS, DES, and DSS databases to search for optical counterparts of their radio cores. We compared mid-infrared counterparts, originally associated in the G4Jy, with the optical ones identified here, and we present results of a vast literature search carried out to collect redshift estimates for all G4Jy-3CRE sources resulting in a total of 145 reliable z measurements

Hidden Treasures in the Unknown 3CR Extragalactic Radio Sky: A Multiwavelength Approach

We present the analysis of multiwavelength observations of seven extragalactic radio sources, listed as unidentified in the Third Cambridge Revised Catalog (3CR). X-ray observations, performed during Chandra Cycle 21, were compared to Very Large Array (VLA), Wide-field Infrared Survey Explorer, and Pan-STARRS observations in the radio, infrared, and optical bands, respectively. All sources in this sample lack a clear optical counterpart, and are thus missing their redshift and optical classification. In order to confirm the X-ray and infrared radio counterparts of core and extended components, here we present for the first time radio maps obtained manually reducing VLA archival data. As in previous papers on the Chandra X-ray snapshot campaign, we report X-ray detections of radio cores and two sources, out of the seven presented here, are found to be members of galaxy clusters. For these two cluster sources (namely, 3CR 409 and 3CR 454.2), we derived surface brightness profiles in four directions. For all seven sources, we measured X-ray intensities of the radio sources and we also performed standard X-ray spectral analysis for the four sources (namely, 3CR 91, 3CR 390, 3CR 409, and 3CR 428) with the brightest nuclei (more than 400 photons in the 2\u27\u27 nuclear region). We also detected extended X-ray emission around 3CR 390 and extended X-ray emission associated with the northern jet of 3CR 158. This paper represents the first attempt to give a multiwavelength view of the unidentified radio sources listed in the 3CR catalog

Formulation of dietetic blueberry (Vaccinium Corymbosum L.) and mango (Mangífera Indica L.) jam

Introducción: En nuestro país, el consumo de azúcares simples excede las recomendaciones nacionales por lo cual, la industria alimentaria juega un papel importante desarrollando nuevas formulaciones con características saludables. El objetivo del presente trabajo fue formular y determinar la composición química de mermeladas dietéticas de arándano (MDA) y mango (MDM). Metodología: Se empleó arándano, mango, aditivos y sucralosa en concentraciones de 0,10; 0,14 y 0,18 g%. Aplicando prueba de preferencia (Tablas de Newell y Mc Farlane), se determinó el porcentaje de edulcorante definitivo. El tratamiento térmico en la elaboración de la mermelada dietética de arándano fue de 220 minutos a 95ºC, con un valor de 27,50ºBrix, en la de mango el tiempo de cocción fue de 82 minutos a 96ºC, con un total de 30,67ºBrix. En las mermeladas dietéticas preferidas se evaluó la aceptabilidad y los análisis de composición físico-química de pH, sólidos solubles, actividad de agua, humedad, cenizas, sodio, hidratos de carbono, fibra cruda y proteínas. Resultados: Las mermeladas se formularon siguiendo el procedimiento tradicional. La concentración de edulcorante preferida en MDA fue del 0,14g% y en MDM de 0,18g%. La aceptabilidad fue elevada, 92% y 98% para los productos de arándano y mango respectivamente. Los análisis físico-químicos en MDA y MDM fueron: pH 4,40 y 4,76, sólidos solubles 27,50 y 30,67ºBrix, actividad de agua 0,97 en ambas, humedad 74,05 y 75,14 g/100g, cenizas 0,30 y 0,79 g/100g, sodio 61,80 y 59,26 mg/100g, hidratos de carbono 25,30 y 23,30 g/100g, fibra cruda 2,12 y 1,24 g/100g, proteínas 0,84 y 0,85 g/100g, valor calórico total 104,56 y 96,60 Kcal/100. Conclusiones: Fue factible la formulación de mermeladas dietéticas de arándano y mango reducidas en su valor calórico y glucídico. Ambas presentaron atributos sensoriales adecuados y resultaron aceptables por la mayoría de los consumidores.Introduction: In our country, the consumption of sugars exceeds the national recommendations; therefore the food industry plays a fundamental role by developing new formulations with healthy characteristics. The aim of this study was to formulate and determine the chemical composition of dietetic blueberry (DBJ) and mango (DMJ) jam. Methodology: The ingredients used were blueberry, mango, additives and sucralose containing concentrations of 0,10; 0,14 and 0,18g%. Applying preference test (Newell and Mc Farlane Tables), the final percentage of sweetener was defined. The heat treatment in the elaboration of blueberry jam was of 220 minutes at 95ºC, with a value of 27,50ºBrix, in the mango one, of 82 minutes at 96ºC, with a total of 30,67ºBrix. In the preferred dietetic jams, acceptability and physico-chemical composition (pH, soluble solids, water activity, moisture, ashes, sodium, carbohydrates, crude fibre and proteins) were evaluated. Results: Dietetic jams were formulated following the traditional procedure. The preferred sweetener concentration in the DBJ was of 0,14g% and in the DMJ, it was of 0,18g%. The acceptability was high, 92% and 98% for the blueberry and mango products respectively. The physico-chemical analysis on the DBJ and DMJ resulted as follows: pH 4,40 and 4,76, soluble solids 27,50 and 30,67ºBrix, water activity 0,97 for both, moisture 74,05 and 75,14g/100g, ashes 0,30 and 0,79g/100g, sodium 61,80 and 59,26mg/100g, carbohydrates 25,30 and 23,30g/100g, crude fiber 2,12 and 1,24g/100g, proteins 0,84 and 0,85g/100g, total caloric value 104,56 and 96,60Kcal/100. Conclusions: The formulation of dietetic blueberry and mango jams reduced in calories and carbohydrates was feasible. Both presented suitable sensory attributes and were acceptable by most consumers.Fil: Olivares la Madrid, Ana Paula. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Salta. Instituto de Investigaciones para la Industria Química. Universidad Nacional de Salta. Facultad de Ingeniería. Instituto de Investigaciones para la Industria Química; ArgentinaFil: Valdiviezo, A. S.. Universidad Nacional de Salta; ArgentinaFil: Ramón, Adriana Noemí. Universidad Nacional de Salta; ArgentinaFil: Uriburu Monasterio, Maria Laura. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Salta. Instituto de Investigaciones para la Industria Química. Universidad Nacional de Salta. Facultad de Ingeniería. Instituto de Investigaciones para la Industria Química; ArgentinaFil: Jimenez, P.. No especifíca

Hawking radiation and thermodynamics of dynamical black holes in phantom dominated universe

The thermodynamic properties of dark energy-dominated universe in the presence of a black hole are investigated in the general case of a varying equation-of-state-parameter $w(a)$. We show that all the thermodynamics quantities are regular at the phantom divide crossing, and particularly the temperature and the entropy of the dark fluid are always positive definite. We also study the accretion process of a phantom fluid by black holes and the conditions required for the validity of the generalized second law of thermodynamics. As a results we obtain a strictly negative chemical potential and an equation-of-state parameter $w<-5/3.$Comment: 22 pages,3 figure

Hidden Treasures in the Unknown 3CR Extragalactic Radio Sky: A Multiwavelength Approach

We present the analysis of multiwavelength observations of seven extragalactic radio sources, listed as unidentified in the Third Cambridge Revised Catalog (3CR). X-ray observations, performed during Chandra Cycle 21, were compared to Very Large Array (VLA), Wide-field Infrared Survey Explorer, and Pan-STARRS observations in the radio, infrared, and optical bands, respectively. All sources in this sample lack a clear optical counterpart, and are thus missing their redshift and optical classification. In order to confirm the X-ray and infrared radio counterparts of core and extended components, here we present for the first time radio maps obtained manually reducing VLA archival data. As in previous papers on the Chandra X-ray snapshot campaign, we report X-ray detections of radio cores and two sources, out of the seven presented here, are found to be members of galaxy clusters. For these two cluster sources (namely, 3CR 409 and 3CR 454.2), we derived surface brightness profiles in four directions. For all seven sources, we measured X-ray intensities of the radio sources and we also performed standard X-ray spectral analysis for the four sources (namely, 3CR 91, 3CR 390, 3CR 409, and 3CR 428) with the brightest nuclei (more than 400 photons in the 2″ nuclear region). We also detected extended X-ray emission around 3CR 390 and extended X-ray emission associated with the northern jet of 3CR 158. This paper represents the first attempt to give a multiwavelength view of the unidentified radio sources listed in the 3CR catalog

Powerful Radio Sources in the Southern Sky. II. A SWIFT X-Ray Perspective

We recently constructed the G4Jy-3CRE, a catalog of extragalactic radio sources based on the GLEAM 4-Jy (G4Jy) sample, with the aim of increasing the number of powerful radio galaxies and quasars with similar selection criteria to those of the revised release of the Third Cambridge catalog (3CR). The G4Jy-3CRE consists of a total of 264 radio sources mainly visible from the Southern Hemisphere. Here, we present an initial X-ray analysis of 89 G4Jy-3CRE radio sources with archival X- ray observations from the Neil Gehrels Swift Observatory. We reduced a total of 615 Swift observations, for about 0.89 Msec of integrated exposure time, we found X-ray counterparts for 61 radio sources belonging to the G4Jy-3CRE, 11 of them showing extended X-ray emission. The remaining 28 sources do not show any X-ray emission associated with their radio cores. Our analysis demonstrates that X-ray snapshot observations, even if lacking uniform exposure times, as those carried out with Swift, allow us to (i) verify and/or re ne the host galaxy identi cation; (ii) discover the extended X-ray emission around radio galaxies of the intracluster medium when harbored in galaxy clusters, as the case of G4Jy 1518 and G4Jy 1664, and (iii) detect X-ray radiation arising from their radio lobes, as for G4Jy 1863.Comment: 35 pages, 17 figures, 2 tables; second paper of a series, pre-proof versio