.A case was filed on Monday over the death of Sylhet Agricultural University (SAU) student Wasim, killed in a road crash in Moulvibazar on Saturday.Twenty-two-year old Wasim, a final-year Biotechnology and Genetic Engineering student, was crushed to death by a bus after its helper reportedly pushed him off the vehicle at Sherpur in Moulvibazar Sadar upazila.SAU proctor Mrittunjoy Kundu filed the case at Moulvibazar Model Police Station in the afternoon.Bus driver Jewel Ahmed, 30, his assistant Masuk Mia, 31, and supervisor Sheful Mia, 35, were accused in the case. Suhel Ahmed, officer-in-charge of Sadar Police Station, said Jewel and Masuk have been arrested while Sheful is on the run.Ten students, who were with Wasim at the time of the accident, have been made witnesses in the case.”It was not an accident. It was a murder,” proctor Kundu said. “Our student Wasim has been killed in a planned way.”
This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only. (Phys.org)—Stephen Hawking, along with Malcolm Perry and Andrew Strominger has updated his ideas regarding solving the black hole information paradox. In their new paper published in the journal Physical Review Letters, the trio outlines their ideas regarding soft hair and black holes and why they believe it may hold the key to resolving a problem that has been causing issues for physicists for over forty years. © 2016 Phys.org The black hole information paradox is relatively easy to understand—black holes theoretically suck in everything around them, including light, causing information to be lost, forever. But back in the 70’s Hawking and colleagues discovered that some information escapes—it is now known as Hawking radiation—but the information that escapes is not enough to describe everything that was eaten by a given black hole, so, the question remains, what happens to the rest of the information when the black hole dies? Trying to solve this paradox has proven to be much more difficult. But, this past January, progress was made, Hawking, Perry and Strominger proposed a possible solution to the paradox, a theory based on what they called soft hair—but not everyone was convinced. The idea behind the theory is that quantum excitations known as soft hairs form a halo around a black hole, holding the information for the things that were consumed. The team came to conclude this was possible by identifying two problems with the assumptions that were made back in the 70’s, namely that the vacuum around black holes is unique and that black holes had no “hair.”After posting their paper on the preprint server arXiv, in January, critics were wary of the theory because it failed to explain how it was that information could be exchanged between the black hole and the soft hair. In this new paper, the trio still has not addressed this problem completely, but they have reworked the math and have found stronger evidence for the existence of soft hairs—if they can do the same for gravity, and show that all of the information is held in the soft hairs, rather than just some, it should greatly increase the chances that one day the paradox will be solved once and for, offering relief for those who feared that the paradox might one day lead to having to toss out some of the most cherished theories in physics. Journal information: Physical Review Letters More information: Stephen W. Hawking et al. Soft Hair on Black Holes, Physical Review Letters (2016). DOI: 10.1103/PhysRevLett.116.231301ABSTRACTIt has recently been shown that Bondi–van der Burg–Metzner–Sachs supertranslation symmetries imply an infinite number of conservation laws for all gravitational theories in asymptotically Minkowskian spacetimes. These laws require black holes to carry a large amount of soft (i.e., zero-energy) supertranslation hair. The presence of a Maxwell field similarly implies soft electric hair. This Letter gives an explicit description of soft hair in terms of soft gravitons or photons on the black hole horizon, and shows that complete information about their quantum state is stored on a holographic plate at the future boundary of the horizon. Charge conservation is used to give an infinite number of exact relations between the evaporation products of black holes which have different soft hair but are otherwise identical. It is further argued that soft hair which is spatially localized to much less than a Planck length cannot be excited in a physically realizable process, giving an effective number of soft degrees of freedom proportional to the horizon area in Planck units. Citation: Hawking team updates soft hair theory to help solve black hole information paradox (2016, June 9) retrieved 18 August 2019 from https://phys.org/news/2016-06-hawking-team-soft-hair-theory.html Physicists split on ideas expressed in Hawking’s latest black hole paper Hawking, Perry, and Strominger suggest that black holes might have “soft hair,” low-energy quantum excitations that release information when the black hole evaporates. Credit: APS/Alan Stonebraker Explore further , arXiv
It’s only in a work of art can you expect life being breathed into the dying. Shovan Gandhi, a Delhi based photographer, in his work Alang has done just the same. Being a part of the bigger picture – Pix – a photo quarterly, Gandhi has portrayed Habitat through this endeavor along with fifteen other artists. Alang is a journey of ships, starting from the day they are born to the waves they crash and land to their graveyard and even beyond. It tries to encapsulate the experiences the ships go through throughout their life and finally end up in this ship breaking centre in Gujarat. He compares, not the life of a ship to that of a man, but vice-versa. One cannot ignore the idea glaring through his pictures that each man-made thing has to come to an end. Once worn out, nothing can keep the drums rolling, or here, the ships sailing. Though ‘philosophical’, it asks the question of death and birth; of waste from value and conversely. Also Read – ‘Playing Jojo was emotionally exhausting’Alang also portrays the journey, its end and a new beginning. The lines by T. S. Eliot, ‘What we call the beginning is often the end. And to make an end is to make a beginning. The end is where we start from,’ fits Alang beautifully. It shows not only how the once mighty ships sailing the economies of the world come to rest in peace, but also how their end marks a new beginning for scrap collectors. For truly, there never is an end. The project has attracted various view points from various fields of ecology, architecture and finance. Not being faced with a criticism yet, Shovan has tried to highlight the prevailing socio-cultural ecosystem in which, according to him, ‘unimportant men can aggregate and die so that dead ships live.’ Drawing influence from architecture and fine art, Gandhi wishes there would be more platforms in the country for display of photographs and art. He expects to present a new project in the following year.WHERE: Goethe-Institute, Maxmuller Bhawan, New DelhiWHEN: When: 9 to 16 May, 7:00 pm to 9:30 pm
Kolkata: Two persons from Asansol and Burdwan were allegedly duped by two e-commerce websites, which sent them a stone and a torn shoe instead of the ordered products.According to sources, on June 28 a person identified as Pijush Kanti Mondal had ordered a pair of expensive sports shoes on an e-commerce website. On Saturday, a youth who was the delivery boy of that e-commerce site, reached Mondal’s home and delivered the product. Before paying the amount, Mondal opened the parcel and found a torn shoe and an empty bottle of soft drink. Immediately, he demanded an explanation and refused to pay the price. The delivery boy informed his superior about the incident. Also Read – Rs 13,000 crore investment to provide 2 lakh jobs: MamataLater, the delivery boy claimed that he had been instructed to click a picture of the packaged objects and take them back. But that did not convince Mondal. He thought that it was the work of the delivery person and thus detained him. After a while, the delivery boy was able to convince him that he and the courier partner to the e-commerce site had nothing to do with the debacle. On the other hand, a few days ago a person identified as Amlan Guha, a resident of Burdwan, was also allegedly duped by another e-commerce website. Also Read – Lightning kills 8, injures 16 in stateDuring the month of June, Guha had ordered two expensive smartphones on the e-commerce site. On July 3, he received the order and had already paid for it. However, when he opened the parcel, he found one smartphone. In the second packet, there was a piece of stone. Immediately, he informed the matter to the e-commerce site authorities but found no positive response. Guha later lodged a complaint at Burdwan police station in this regard.