Sunday, January 26, 2020

Higher Dimensional Black Hole Corrected Tunneling Radiation

Higher Dimensional Black Hole Corrected Tunneling Radiation Corrected tunneling radiation of a higher dimensional black hole and generalized second law S. S. Mortazavi[*]1, A. Farmany1, H. Noorizadeh2, V. Fayaz1, H. Hosseinkhani1 Abstract Study the quantum gravitational effects on a higher dimensional horizon, the semiclassical s-wave tunneling radiation of black holes are calculated. It is shown that quantum gravitational effects correct the semiclassical radiation of the horizon space time. Within this background, the generalized second law of thermodynamics is applied to the black hole entropy. 1. Introduction It is interesting that that radiation of black holes can be viewed as simple tunneling phenomena. In this view, a particle-antiparticle pair may form close to a black hole event horizon. The ingoing mode is trapped inside the horizon while the outgoing mode can tunnel through the event horizon. It is interesting that this effect is a quantum mechanically and the present of an event horizon is essential (Hawking, 1975). Recently, the semiclassical analysis of this phenomenon carried out by Parikh and Wilczek (Parikh, Wilczek, 2000; Parikh, 2002; Parikh, 2004; Parikh, 2004). Parikh-Wilczek proposal of black hole tunneling radiation is based on the computation of incoming part of action for classically forbidden of s-wave emission across the horizon (Parikh, Wilczek, 2000; Parikh, 2002; Parikh, 2004; Parikh, 2004; Kraus, Wilczek, 1994; Kraus, Wilczek, 1995; Kraus, Wilczek, 1995; Kraus, Keski-Vakkuri, 1997; Berezin, Boyarsky, Neronov, 1999; Volovik, 1999;1999; Calogeracos, Volovik,1999). As a comparison between Hawking original calculation and tunneling method, it is easy to see that the hawking method is a direct method but its complication to generalization to all other space times is failed while the Parikh-Wilczeck proposal, the tunneling approaches have been successfully applied to a wide range of both the black hole space time horizon and cosmological horizon. For example, 3- dimensional BTZ black holes (Agheben, Nadalini, Vanzo, Zerbini, 2005; Wu, Jiang, 2006), Vaidya space time(Ren, Zhang, Zhao, 2006), dynamical black holes(Di Criscienzo, Nadalini, Vanzo, Zerbini, Zoccatelli, 2007), black rings(Zhao, 2006), Kerr and Kerr-Newman black holes(Jiang, Wu, Cai, 2006; Zhang, Zhao, 2006; Hu, Zhang, Zhao, 2006; Kerner, Mann, 2006), Taub-NUT space time(Kerner, Mann, 2006), GÃ ¶del space time (Kerner, Mann, 2007), dynamical horizons(Di Criscienzo, Nadalini, Vanzo, Zerbini, Zoccatelli, 2007), cosmological horizons(Parikh, 2002; Medved,2002; Sekiwa, 2008), Rindler spac e time (Medved, 2002), de Sitter space time. Of course in all of these approaches the Unruh temperature is recovered successfully (Unruh, 1976; Akhmedova, Pilling, Gill, Singleton, 2008; Banerjee, Kulkarni, 2008; Banerjee, Majhi, 2008). This model is applied to not only the black hole event horizon, but also to the cosmological horizon (Parikh, 2002; Medved, 2002; Sekiwa, 2008). The black hole tunneling method was studied in different space-times and different frames and the time contribution to the black hole radiation is developed in (Chowdhury, 2008; Akhmedov, Akhmedova, Pilling, Singleton, 2007; Zhang, Cai, Zhan, 2009; Banerjee, Majhi, 2009; Akhmedov, et al, 2006; Akhmedov, Pilling, Singleton, 2008). In continue, the spectrum form of the tunneling mechanism is analyzed using the density matrix technique (Banerjee, Majhi, 2009). However the Parikh-Wilczek method is based on the classical analysis, when it comes into the high-energy regime, for example a small black hole whose size can be compared with Planck scale, the effect of quantum gravity should not be forbidden. In this case, the conventional semiclassical approaches are not proper and the complete quantum gravity analysis is required. To study the quantum gravitational effects on the tunneling mechanism it is interesting to relate the analysis under a minimal length quantum gravity scale ( Adler, Chen, Santiago, 2001; Han, Li, Ling, 2008; Farmany, et al, 2008; Shu, Shen, 2008; Wang, Gui, Ma, 2008; Setare, 2004; Kim, Park, 2007; Nouicer, 2007; Zhao, Zhang, 2006; Xiang, 2006; Dehghani, Farmany, 2009). In this paper, the black hole tunneling radiation is studied based on the generalized uncertainty principle. It is shown that the generalized second law of thermodynamics applie a bound on the tunneling radiation. 2. The corrected Bekenstein-Hawking entropy A d-dimensional spherical symmetric black hole background is defined by (1) where . The uncertainty in the position of a particle, during the emission, (2) where applying the uncertainty principle, we obtain the energy of radiated particle, (3) Where and Mpl is Planck mass. Temperature of black hole in a d-dimension space time may be obtained by setting the radiated particle mass m to. The d-dimensional black hole temperature may be obtained as, (4) where d3. Eqs. (4) shows the temperature of a d-dimensional black hole with . The Bekenstein-Hawking entropy is usually derived from the Hawking temperature. The entropy S may be found from the well known thermodynamics relation, (5) From (3-5) we obtain, (6) Quantum gravitational effects of horizon may affect on the thermodynamics of black hole and modifies its usual thermodynamical behavior. Study of black hole thermodynamics in the quantum gravity theory was made using a generalized uncertainty principle (Adler, 1999; Hossenfelder et al, 2004; Maggiore, 1994; Kempf, Managano, 1997; Farmany, Abbasi, Naghipour, 2007) (7) Where lpl is the Planck length. Setting 2rh as , we obtain, (8) Solving for minimum and expanding around lpl2=0, eq. (8) reads, (9) Comparing (9) with (7) we obtain, (10) inserting (4) into (10), the d-dimensional black hole temperature me be obtained, (11) The corrected entropy S’ may be obtained from the thermodynamics relation (5), (12) 3. The corrected black hole radiation As shown by Parick and Wilczek (2000) the WKB approximation relate the tunneling probability to the imaginary part of the action (13) Where I is the classical action of trajectory. The difference between all approaches of tunneling method is in how the action is calculated. As shown by Arzano et al (Arzano, Medved, Vagenas, 2005), (14) in terms of black hole mass M and energy E, which is correspond to (15) provided the Bekenstein-Hawking entropy/area relation. Consider the above relation, eq.(13) can be written in the following general form, (16) The quantum gravity-corrected black hole entropy is given by eq.(12), so, (17) Substituting (17) into (16) we obtain, (18) which shows the corrected tunneling probability and . 4. Generalized second law of thermodynamics and modified black hole tunneling radiation Bekenstein (1981) has conjectured that the entropy S and energy E of any thermodynamic system must obey, (19) where R is defined as the circumferential radius. This bound is universal in the sense that it is supposed to hold in any matter system. The Bekenstein bound has been confirmed in wide classes of systems. However, as pointed by Bekenstein, the bound is valid for systems with finite size and limited self-gravity. Counterexamples can be easily found in systems undergoing gravitational collapse (Bousso, 1999). Another entropy bound is related to the holographic principle, which says that the entropy in a spherical volume satisfies (20) where A is the area of the system. It was shown that this bound is violated for sufficiently large volumes (Fischler and Susskind, 1998). As shown by eqs.(19-20), there is a bound on the entropy of the black hole when it related to the black hole area. While the black hole entropy bound applied to eq. (7), we obtain, (21) So, in the presence of entropy bound, eq. (16) may be, (22) Combining eq.(22) and (18) we obtain the corrected tunneling probability of black hole radiation. (23) Conclusion The semiclassical black hole tunneling radiation is calculated by the Parikh-Wilczek tunneling proposal of black hole radiation based on the generalized uncertainty principle. It is shown that the Bekenstein-Hawking entropy of black holes receives a correction that affects on the radiation tunneling probability. In continue applying the generalized second law of thermodynamics to the modified black hole tunneling radiation is obtained. References Agheben, M., M. Nadalini, L. Vanzo, S. Zerbini, JHEP 0505 (2005) 014, Akhmedova, V., T. Pilling, A. de Gill, D. Singleton, arXiv:0808.3413 [hep-th] Akhmedov, E. T., V. Akhmedova, T. Pilling, D. Singleton, Int. J. Mod. Phys. A 22:1705- 1715, 2007; Akhmedov, E. T., V. Akhmedova, D. Singleton, Phys. Lett. B642:124-128, 2006; Akhmedova, V,T. Pilling, A. de Gill, D. Singleton, Phys. Lett. B666:269- 271, 2008 Akhmedov, E.T., T. Pilling, D. Singleton, Int. J. Mod. Phys. D17:2453-2458,2008 Adler, R., P. Chen, D. Santiago, Gen. Rel. Grav. 33 (2001) 2101 Adler, R., Mod. Phys. Lett .A 14 (1999)1371, Amati D., M. Ciafaloni, G. Veneziano, Phys. Lett. B 197, 81 (1987) Arzano, M., A. Medved, E. Vagenas, JHEP 0509 (2005) 037, Banerjee, B. R., B. R. Majhi, Phys. Lett. B 675(2009)243 Banerjee, B. R., B. R. Majhi, hep-th/09030250 Banerjee, R., S. Kulkarni, arXiv:0810.5683 Banerjee, R., B.R. Majhi, JHEP 0806:095, 2008; Berezin, V.A., A. Boyarsky, A.Yu. Neronov, Gravit. Cosmol. 5 (1999) 16; Bekenstein J.D., Phys. Rev. D 23 (1981) 287. Bousso, R., JHEP 07 (1999) 004 Bousso, R., E.E. Flanagan and D. Marolf, Phys. Rev. D 68 (2003) 064001 Calogeracos, A., G.E. Volovik, JETP Lett. 69 (1999) 281, Chowdhury, B. D., Pramana 70:593-612,2008; Dehghani, M., A. Farmany, Phys. Lett. B 675(2009)460 Di Criscienzo, R., M. Nadalini, L. Vanzo, S. Zerbini, G. Zoccatelli, arXiv: 0707.4425 [hep-th]. Farmany, A., S. Abbasi, A. Naghipour, Phys. Lett. B 650 (2007) 33-35, Farmany A., et al, Acta Physica Polonica A 114 (2008) 651 Fischler W., L. Susskind, hep-th/9806039. Fu-Wen Shu, You-Gen Shen, Phys. Lett. B 661(2008) 295 Fu Jun Wang, Yuan Xing Gui, Chun Rui Ma, Phys. Lett. B 660 (2008) 144 Gao S., and J.P.S. Lemos, JHEP 04 (2004) 017 Gao S., and J.P.S. Lemos, Phys. Rev. D 71 (2005) 084010 Hawking, S. W., Commun. Math. Phys. 43(1975)199 Hossenfelder S., et al, Phys.Lett. B584 (2004) Hu, Y., J. Zhang, Z. Zhao, gr-qc/0601018. Jiang, Q.-Q., S.-Q. Wu, X. Cai, Phys. Rev. D 73 (2006) 064003, Kempf, A., J. Phys. A 30 (1997)2093 Kempf, A.,G. Managano, Phys. Rev. D 55 (1997) 7909 Kerner, R., R.B. Mann, Phys. Rev. D 73 (2006) 104010. Kerner R., R.B. Mann, Phys. Rev. D 75 (2007) 084022. Kraus, P., F. Wilczek, gr-qc/9406042; Kraus P., F. Wilczek, Nucl. Phys. 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B638 (2006)519 Xin Han, Huarun Li, Yi Ling, Phys. Lett. B 666(2008)121 Yoneya, T., Class. Quant. Gravity 17, 1307 (2000) Yong-Wan Kim, Young-Jai Park, Phys. Lett. B 655(2007)172 Zhao, L., hep-th/0602065. Zhang, J., Z. Zhao, Phys. Lett. B 638 (2006) 110, Zhang, B., Q. Cai, M. Zhan, Phys. Lett. B671:310-313,2009; Zhao Ren, Zhang Sheng-Li, Phys. Lett. B 641(2006)208 1 [*] Email: [emailprotected]

Friday, January 17, 2020

Lalala

Summary of the story Weekend is a short feminists story depicting traditional middle-class family, consisting of the mother- Martha and the father of three- Martin, going for the weekend to their cottage near Stonehenge, where they will meet their friends. On Friday, Martha is preparing some things, food and complaining Nearly) about her life. Martin wants her to be perfect, as she says â€Å"he Likes women with small hips and big bosoms, that's Incredible. † She has a suspicion that her husband has an affair with his secretary, who looks exactly that way.Martin has a small sport car, but they take Marsh's car for the trip, since it is bigger, although it is the older one. Martha can ‘t drive, because her driving license was taken away for drunken driving. The whole Journey, Martin Is Joking about the car, but Martha takes It personally, whilst she has got the feeling, he Is ambiguously talking about her. Late at night, their friends- Colic and his girlfriend Katie, arri ve to visit them in their cottage. His previous wife, Janet with whom he has two children, was a nice woman and Martha liked her, however she was not so stunning like the new one.Martha prepares mushroom omelets In her night, sets the table, cleans everything after the late supper and goes to bed at 2 a. M. Katie sits and has a good time, without any intention to help her. The other day Martha sleeps longer than usually and has the consumptions, because everything in the kitchen stays exactly in the same place, where the consumers had left It. She should ‘t sleep so long. Glamorous Katie did not help with anything. Again. The rest of their friends, Harry and Beryl, come for the lunch. They bring fresh artichokes. Ill Martha Is preparing the artichoke soup, the top of the blender flies away and the kitchen is full of artichoke puree. Awkward Martha. Jenny starts her first period and Martha is impressed and cries. She is not her little child anymore, but a little woman. To sum u p the story, a woman must be always perfect. Great wife, mother, babysitter, awesome cook, successful careerist, best friend, psychologist, teacher, doctor, dishwasher, cleaner with bottomless sexual appetite. While exhaustion, influenza, migraine or other illnesses are mission impossible.And naturally, you would do it all in high heels, scented, with exquisite hair, flawless make- up and smile on your face. 2) Characteristics of the mall characters wants to be a perfect woman and tries to manage everything, what in her eyes woman should manage; however, her husband does not see that. She feels undervalued by him as long as he is criticizing her and looks back to the other women, young, childless, with big bosoms and little hips. She is also helping pretty much with house expenses, the thing, she's not very satisfied with, because a good husband of his good wife should manage that.Martin- husband of Martha; iconic example of a man who comes home, extremely exhausted after all day in work and awaiting the house to be clean, children calm and that his wife will be neat, scented, smiling and ready to make him a supper according to his wishes. He is not satisfied with his wife. She should be slimmer, nicer, make healthier meals, and use plenty of perfumes he keeps buying her. Jenny, Jasper, Colony- children of Martha and Martin. We don ‘t know much about them. Jenny dries off her hair with Katie ‘s Yves Saint Laurent towel and gets the erred for the first time at the end of the story. Jasper has hay fever.Katie- a glamorous, childless, scented chick in her middle thirties; kind of a â€Å"modern wife†, who came to the relationship with one bag of clothes, intelligence and free mind. Colic- boyfriend of Katie, he loves her very much and wants to marry her. He has two children from the previous marriage. Katie does not like his ex-wife Janet and their children; he can meet them Just once per month. He is a successful businessman. Harry and Beryl- friends of Martin and Martha; Beryl is a secretary and Harry is an artist. She falls asleep during the visit and Harry gets drunk and is going to drive. He has scar on his temple from the car accident.Mrs†¦ Hooded- came in twice a week to clean and Martha paid her from her wages 3) The story is described from Martha ‘s perspective. Would it be the same, if the narration would be done by Martin? No, definitely. It would not be the same. As far as l' m concerned, Martin perceives the whole situation completely differently than Mart does. He is looking onto problems and situations with a â€Å"man's eye†. He does not feel that Martha does too much around the house, children etc. He feels that she should cook better, have smaller hips and try to be fresher. 4) What are Martha ‘s main worries? Why does she obey Martin in everything?Why does she never object? She wants to be an amazing wife of her great husband that's why she obeys him. She feels that it is her dut y in the role of a woman, mother and wife to behave that way. She is afraid of losing of Martin and fail in all her roles. Martha cannot imagine her life without a husband – she does not realize she could live a different life, because this is what she knows. That is why she is trying to keep Martin at all costs although she is not happy with him. Martha is a prototype of housewife and Katie is her opposite. Martha has a husband, three children and her family is something sacred for her.But she works and keeps her own money that means, she can get by from her wages. Katie has different attitude to these things. She hates to be in the traditional position of a woman, like Martha is. Katie is divorced twice and doses t have children. From my point of view, she is that kind of woman, who needs husband to take care of her in general, mostly from the viewpoint of expenses. Although Katie appears as a confident woman, we also witness her insecurities – she realizes that Coli c is tied to Janet because they have children together and that her position might not be that stable. ) How is the story narrated? Are there long descriptions or dialogues? Why not? The story is narrated as Mart ‘s train of thought. Her mind is important. She is describing the situations from subjective point of view, not like the omniscient narrator. There are no long descriptions, nor dialogues, because they are not necessary (and Martha does not have time for them since she rushes from one task o another – so the narration reflects her state of mind); the reader understands from the situations the whole context. Anyway the direct speech is used for being more authentic.Her descriptions make the story more personal than the universal third person narrator or â€Å"the eye of the camera†. If any woman reads it, she finds herself in many similar situations and that is the aim, to personalize the story and give the percipient the space to make his point of view a bout the piece and given problem. 7) Look at Martin ‘s comments which are inserted in the brackets. What do they suggest? They suggest Martin's dissatisfaction or ironical view on Martha and her acts. They are not formulated as direct criticism, but are rather indirect.Though he might appear as a kind husband, Martha takes his remarks personally as a form of criticism and thus puts even more pressure on herself. 8) What is author's opinion on women like Martha? Who is responsible for their unhappiness- is it men or the women themselves? A woman should love her family and her husband, but should not obey him in the way like Martha did. She gave her win â€Å"Self† and life to her family, but doses ‘t get it back from them. She doses t feel intrinsic fulfillment, which she should feel, living this pattern of life.They are both responsible for their unhappiness – males and females. Because if Martha doses ‘t want to, she din ‘t have to behave this way. As long as, we are concerning on feminist fiction, then men are responsible for the woman's unhappiness 0. Weldon is critical not only to men, but to women as well. She points to the fact that they have power in their hands and they should be active in pursuing happiness. Martha, forever, only relies on her husband, not on herself so it is her own fault that she leads an unhappy life. ) Why does Martha cry at the end of the story? Because her only daughter is becoming a woman. From this important hoar stone in her and they will cause troubles to her woman being and gain control over her whole life, like Martin does to Martha. Martha realizes that her own daughter is now entering the period of womanhood with all its responsibilities. The ending also shows that Martha feels powerless and does not realize that her own daughter does not have to have the same life as she does.

Thursday, January 9, 2020

Tsar Alexander Ii - 1158 Words

Question: â€Å"His measures of reform did not disguise his belief in the need to maintain autocratic rule.† To what extent do you agree with this point of view? Tsar Alexander II had many reforms. He was an autocratic ruler who began his reforms in Russia in 1855. Some claim that his reforms were proof of his liberal attitude and others argue that he was primarily a traditionalist, this essay will explore to what extent both of arguments are accurate depictions of â€Å"The last great tsar.† When Alexander II came to power he was already faced with a series of problems, the Crimean war (1854-56) being a key one. Russia’s defeat in the Crimean war resulted in the realization that Russia was in fact a backward nation, and in need of†¦show more content†¦This reform encouraged a sense of responsibility within the peasant population and helped them to see they did not always have to rely on the Tsar to do things for them. The Zemstva also promoted a way of thinking that allowed people to trust that their opinions and concerns mattered and were going to be taken care of. Due to road building being improved Russia took a step forward towards advocating urbanization and a more modern nation was in the process of being formed. This urbanization meant that Russia could try and create a middle class, and therefore make Russia more industrialized. Another major reform happened in the educational systems. Alexander II was brought up in a liberal manner, he was taught subjects such as philosophy (by his tutor Pobodonostev) in which one would learn about things such as ethics. This means that it’s plausible to think that Alexander II genuinely wanted to promote a liberal attitude, and this is reflected in the educational reforms. Under Alexander’s rule universities in Russia became easier to get into, which meant more people went to university. In addition to this the attendance of secondary school children doubled, and children were starting to be taught more western subjects. On the other hand people believe that Alexander’s II reforms were just a disguise to maintain autocratic rule, and hide his trueShow MoreRelatedTo What Extent Did Alexander Ii Deserve His Title of the â€Å"Tsar Liberator?†1731 Words   |  7 PagesDoes Alexander II truly deserve the title of liberator? To liberate is to set free (a group or individual) from legal, social or political restrictions. There is evidence to suggest that he disliked serfdom. Even his father, Nicholas I, believed that serfdom was an â€Å"evil palpable to all,† and Alexander II was certainly even more liberally educated than his father. His arguably most fundamental reform was the emancipation of serfdom in 1861. As he said, â€Å"It is best to abolish serfdom from aboveRead MoreEssay on Did Alexander II deserve the title Tsar Liberator?1229 Words   |  5 Pagesï » ¿Did Alexander II deserve the title â€Å"Tsar Liberator†? Taking control of autocratic Russia in 1855, Alexander II was the successor to his father Tsar Nicolas I having been trained his entire life to take on the role. During his reign as Tsar, Alexander passed many reforms all of which varied in political, social and economic stance. His most famous reform was deemed to be that of the emancipation of the Serfs, gaining him the title ‘Tsar Liberator’ as many believed that his effort to free those whoRead MoreThe War Of The Nineteenth Century1553 Words   |  7 PagesTsar Alexander II was assassinated during the midst of a reformation movement in Russia toward the end of the nineteenth century. At this time, the Russian lower class blamed Jews for their poor living conditions. 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The reforms impacted not only the culture of the time, but also the writing of many authors. Fyodor Dostoevsky was one of those authors. His book Crime and Punishment describes how life was like in the lower classes. The culture of Russia during the years 1855 to 1881 was shaped by its tsarist autocracy while the literature of Fyodor Dostoevsky evinces its cultural connection. Alex II established type of government was a monarchy

Wednesday, January 1, 2020

The Slavery Of The Colonial North Americas - 1195 Words

Chapter 3 was talking about black people in the colonial North Americas. This chapter was very interesting but there were three main parts in the chapter that really caught my attention and that was the slave life in early America, the Origins of African American culture, and black women in colonial America. Each part that I’m about to break down sheds light on what happened during that time. During the slave life in early American there were little to show, evidence wise because the African Americans, American Indian and some of the white people did not have money and they kept no records of that culture. The living conditions for slaves in the 1800’s were awful and they living in such poor condition with log cabins as houses and the ground which was dirt as the floor and brick chimneys and barely any window. Slaves had to make do with what they had just to survive. As time progressed the items in the cabin became more substantial. The larger plantation cabins came eq uipped with tables, linens, chamber pots, and oil lamps. When other cabins on smaller plantations only had half of the items. As bad as the living conditions there were poor clothing as well. Men had cloths that covered their penis and women would wear skirts and leave the upper part of their body bare. For the children, they had to go around naked until their body’s start to mature and they hit puberty. As time went by, the man would start wearing pants and shirts and the women would wear dresses and aShow MoreRelated The Origins of Chattel Slavery in Colonial North America Essay1579 Words   |  7 PagesThe Origins of Chattel Slavery in Colonial North America There have been many illuminating studies in the field of the origins of chattel slavery in Colonial North America. Alpert, 1970; Edmondson, 1976; Jordan, 1962: Ruchames, 1967; Starr, 1973, wrote seminal studies that did much to bring insight to the subject. Goetz, 2009; Mason, 2006; Smaje, 2002; Neeganagwedgin, 2012, presented evidence that have either reexamined old questions or used new methods and approaches to ask news questionsRead MoreMill Creek Entertainment Has Created The Film Series Up1160 Words   |  5 PagesMill Creek Entertainment has created the film series Up From Slavery which accounts the events of the Mid-Atlantic slave trade and the struggles of African slaves and their resistance of the institution. The episode 18th Century Colonial America and Slavery of the series specifically details the lives of North American slaves. Out of the 12 million slaves taken from Africa, only 500,000 came to North America. 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