August 31

Dark Matter May be Easier to Detect than Previously Thought

first_img(PhysOrg.com) — The Milky Way, like many other galaxies, is thought to be embedded in massive, lumpy amounts of dark matter that release gamma rays and other emissions. Although at first these emissions seem too faint to detect, recent observations have shown that they may be stronger than previously thought. In a new study, scientists have developed a model that predicts that gamma rays from hundreds of dark matter clumps should be detectable by the Fermi satellite that was launched in June 2008. In their study published in a recent issue of Science Express, Michael Kuhlen of the Institute for Advanced Study in Princeton, Piero Madau of the University of California, Santa Cruz, and Joseph Silk of the University of Oxford have investigated how the luminosity from cold dark matter annihilations can be enhanced by orders of magnitude by the Sommerfeld effect. While previous calculations have shown that only a handful of the most massive dark matter halos should emit gamma rays detectable by satellites, accounting for the Sommerfeld effect suggests otherwise.“Annihilation is a quantum mechanical process that can occur whenever a particle and its antiparticle collide,” Kuhlen told PhysOrg.com. “It turns out that in many promising particle physics models the dark matter particle is its own antiparticle. In that case you only need to get to sufficiently high densities for dark matter particles to have a reasonable chance to collide with each other and hence to annihilate. It turns out that the predicted dark matter densities at the centers of subhalos are high enough that a large enough number of annihilation events might occur for Fermi to have a chance to detect the resulting radiation. Especially if the Sommerfeld effect is important.”As the researchers explain, the Sommerfeld effect is the result of a long-range attractive force between dark matter particles that effectively increases the dark matter annihilation rate. When analyzing the experimental results of other satellites, researchers discovered a surprisingly large amount of electron and antimatter emissions. The Sommerfeld effect, they suggest, might explain these puzzling signals.To explore this possibility, the researchers applied the Sommerfeld correction to simulations that use more than one billion particles to model the formation of a dark matter halo the size of the Milky Way. They found that, after they applied the corrections, smaller subhalos (and even smaller “subclumps”) are much more clearly visible than in previous predictions. When compared to expected backgrounds, the researchers predict that, even in conservative cases, ten or more subhalos should be discovered after five years of searching by the Fermi satellite. They also predict that Fermi should be able to detect some of these subhalos in its first year of observation, a prediction that will soon be tested.If the researchers are correct, dark matter detections could open up the door to interesting possibilities such as non-gravitational dark matter interactions and new particle physics. “That would be a spectacular confirmation of the particle nature of dark matter [if the Fermi satellite does detect dark matter annihilation],” Kuhlen said. “It would certainly result in a Nobel Prize for someone on the Fermi team. Don’t forget that we have no direct evidence of dark matter. Over the last 70-80 years astronomers have amassed numerous independent observational pieces of evidence for its existence, and particle physics theory provides many plausible particle candidates. As a result, dark matter is a firm part of the standard paradigm of cosmological structure formation. Nonetheless, it would be great to get some more direct confirmation of this hypothesis. Detecting the products of dark matter annihilation would provide such evidence. Furthermore it would shed light on the nature of the dark matter particle: its mass and its annihilation cross section, for example.”More information: Michael Kuhlen, Piero Madau, Joseph Silk. “Exploring Dark Matter with Milky Way Substructure.” Science Express. 10.1126/science.1174881.Copyright 2009 PhysOrg.com. All rights reserved. This material may not be published, broadcast, rewritten or redistributed in whole or part without the express written permission of PhysOrg.com. Study shows clumps and streams of dark matter in inner regions of the Milky Way Explore further Simulated all-sky maps of the Sommerfeld-enhanced annihilation surface brightness: In (A), there is no Sommerfeld enhancement, while in (B) and (C), the enhancement increases. Image credit: Kuhlen, Madau, and Silk. Citation: Dark Matter May be Easier to Detect than Previously Thought (2009, August 10) retrieved 18 August 2019 from https://phys.org/news/2009-08-dark-easier-previously-thought.html 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.last_img read more

August 31

Researchers study complex morphology of the protoplanetary disc around star MWC 758

first_img 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. Located some 500 light years away from the Earth, MWC 758 (also known as HD 36112) is a young Herbig Ae star, known to have a circumstellar disc around it. The disc is about 3.5 million years old and has an accretion rate of approximately 100 millionth of a solar mass per year.What is so special about MWC 758’s disc is its complex morphology. It has a large cavity of a few tens of AU in radius, asymmetries in the dust continuum emission and two spiral arms seen in near-infrared scattered light that might be spiral density waves launched by planets of a few Jupiter masses.Now, a team of astronomers led by Yann Boehler of the Rice University in Houston, Texas, presents the results of ALMA observations conducted in order to obtain more detailed information about the morphology of MWC 758’s disc. The observations were carried out in September 2015 in an angular resolution of 0.1″ to 0.2″, what provided new insights into the disc morphology.”Our new observations image the MWC 758 system in both the dust continuum emission, at a wavelength of about 0.88 millimeter, and in the 13CO and C18O J = 3-2 emission lines. The observations achieve a resolution of 0.1″-0.2″, or 15-30 AU according to the distance of the system, which corresponds to a factor 4 of improvement with respect to previous millimeter-wave observations, and reveal unprecedented details of the disc morphology,” the researchers wrote in the paper.According to the study, the disc’s cavity, which might contain a mildly inner warped disc, has a radius of roughly 40 AU. The scientists detected dust emission at millimeter wavelengths what suggests the presence of the inner disc. They also found a twist in the velocity curves in the cavity, as well as indications of a shadow projected toward the west outer region, what indicates that this inner disc could be mildly warped.Beyond this cavity, the outer disc features two large dust clumps at 47 and 82 AU that form a double-ring structure. The clumps are associated with elongated structures which are tracing the double-ring structure.Furthermore, ALMA observations revealed the two spirals previously detected in near-infrared and two arc-like features, which were also found by previous near-infrared studies.The researchers concluded that the complex morphology of MWC 758’s disc could be explained by the existence of two massive planets orbiting the star.”Our observations are consistent with the existence of two massive planets. A planet in the inner region of the disc which carves the cavity, and another planet in the outer regions to produce the spirals and the dark ring between the two dust clumps,” the authors of the paper concluded. Citation: Researchers study complex morphology of the protoplanetary disc around star MWC 758 (2018, January 8) retrieved 18 August 2019 from https://phys.org/news/2018-01-complex-morphology-protoplanetary-disc-star.html Explore further Study reveals insights into the nature of protoplanetary disc around HD 169142 ALMA images of MWC 758. Left: Map of the dust continuum emission obtained using super-uniform weighting. Right: Map of the disk cavity in logarithmic scale. Credit: Boehler et al., 2017. More information: The complex morphology of the young disk MWC 758: Spirals and dust clumps around a large cavity, arXiv:1712.08845 [astro-ph.EP] arxiv.org/abs/1712.08845AbstractWe present Atacama Large Millimeter Array (ALMA) observations at an angular resolution of 0.1-0.2″ of the disk surrounding the young Herbig Ae star MWC 758. The data consist of images of the dust continuum emission recorded at 0.88 millimeter, as well as images of the 13CO and C18O J = 3-2 emission lines. The dust continuum emission is characterized by a large cavity of roughly 40 au in radius which might contain a mildly inner warped disk. The outer disk features two bright emission clumps at radii of about 47 and 82 au that present azimuthal extensions and form a double-ring structure. The comparison with radiative transfer models indicates that these two maxima of emission correspond to local increases in the dust surface density of about a factor 2.5 and 6.5 for the south and north clump, respectively. The optically thick 13CO peak emission, which traces the temperature, and the dust continuum emission, which probes the disk midplane, additionally reveal two spirals previously detected in near-IR at the disk surface. The spirals seen in the dust continuum emission present, however, a slight shift of a few au towards larger radii and one of the spirals crosses the south dust clump. Finally, we present different scenarios in order to explain the complex structure of the disk. © 2018 Phys.org Using the Atacama Large Millimeter Array (ALMA) in Chile, an international team of researchers has studied the disc surrounding the star MWC 758. The new observations reveal further insights into the complex morphology of this disc. The study was presented in a paper published December 23 on arXiv.org.last_img read more

August 31

Political Passion Inspires Trust—Even From Opponents

first_img“Individuals who care about contentious social issues signal to observers that they have integrity, and thus can be trusted,” Zlatev writes in the journal Psychological Science. Perhaps optimistically, he adds that this knowledge could inspire “interventions to help mitigate the growing ideological divide.” Read the whole story: Pacific Standard There’s a lot of evidence suggesting that Americans trust each other less and less. But new research suggests an unorthodox solution to our political divide: firmly expressing our political opinions, even when they might prove unpopular. “Across five studies using a variety of contentious social issues, I found evidence that people trust others who demonstrate strong feelings about social issues, even when they disagree with or dislike them,” reports Julian Zlatev of Harvard Business School. In contrast, he found “low rates of trust toward individuals who care little about these issues.”last_img read more

August 31

Coral vibgyor on the ramp

Playing all the way with colours and shapes, KhusiZ’s collection was a brilliant celebration of life, under the ocean and up above it. While the flowy silhouettes matched the water flow, the prints were more about the vibrant colour of the corals. From sweeping gowns to short dresses, fitting pants and jodhpurs – the collection was a burst of colour from head to toe – matched up brilliantly by the footwear. It wasn’t pop art on the ramp mind you – make no mistake – no fuschias or popping oranges. More the fresh delectable colour of the breathing sea corals in aquas, purples, yellows and soft pinks. We also spotted some interesting collars that seemed to be the new age pop version of Elizabethan ones. read more

August 31

Charles Dickens goes Hinglish

first_imgEncapsulating the festive spirit, A Christmas Carol, is a play performed by puppets, richly enhancing the flavour of the Charles Dickens book. In a unique effort, Dramabaaz Co. will be presenting an adaptation of A Christmas Carol, an 80 minute play in Hinglish. This is a new version of the story of Ebenezer Scrooge, the miserly old man, who receives a Christmas Eve visit from the ghost of his partner, Jacob Marley, warning him to mend his selfish ways. Also Read – ‘Playing Jojo was emotionally exhausting’ Talking about the concept of the play, Garima Arya from Dramabaaz Co. says: ‘This classic story has been adapted  and creatively transformed it into a ‘puppet-actor play’, which includes puppetry, human actors and dancers. Hence, it is a unique amalgamation of the following art forms — glove puppetry, acting, choreography and artistic designs and graphics.’ Explaining how she came up with the idea, she mentions: ‘We wanted to do something special this Christmas….and what better choice than the famous story Also Read – Leslie doing new comedy special with NetflixA Christmas Carol , and that too when the whole world is celebrating Charles Dickens 200 this year!’ Asked about the present condition of puppetry in India, she says:, ‘I think puppetry needs to go to the next level where it involves all kinds of art forms. This  will help make it more attractive, entertaining, educational and creative at the same time. India is opening up to experiments and is appreciating out-of-the box ideas. These ideas need to be convincing. That’s all.’ The play focuses on the storyline in which during the night three spirits appear before Scrooge, showing him visions of Christmas Past, Christmas Present and Christmas Future — finally revealing the possible results of his unloving, uncaring life. Upon waking up on Christmas morning he joyfully flings open his window, and cries out: ‘Oh, Jacob Marley and Christmas time be praised! I’m still here!(picks up some clothes, drops them, tries to sit, but can’t contain himself) I don’t know what to do! (laughs) I’m as light as a feather, I’m as happy as an angel, I’m as merry as a school boy! (shouting out the window to passersby) A Merry Christmas to everybody! (to the audience) A Happy New Year to all the world!’ He then proceeds to amaze one and all with his newly found Christmas spirit.DETAILTickets: Rs 350, at mycity4kids.com Schedule: 24 December, 7.30pm At: LTG Auditorium Mandi House; 25 December, 3.30 pm & 7.30pm At: Epicentre, Sector 44, Gurgaon; 26 December, 7 pm At: Alliance Francaise, 72, Lodhi Estate 27 December, 3.30 pm & 7.30pm At: Alliance Francaise, 72, Lodhi Estatelast_img read more

August 31

Get the party started

first_imgUsher in the New Year in all its grandeur in the heart of the Capital with some great dining options and room packages at Shangri-La’s Eros Hotel.On New Year’s Eve, the all day dining restaurant, Café Uno offers a sumptuous dinner buffet spread and a choice of unlimited select beverages, from 7:00 p.m. to midnight.Enjoy high energy commercial and house music by our guest DJ at Rs. 4,500 plus taxes per person. Dinner buffet with unlimited select alcoholic beverages comes at Rs.3, 000 plus taxes for kids below 12 years old. Also Read – ‘Playing Jojo was emotionally exhausting’Indulge in the finest New Year’s Eve Asian buffet spread meticulously crafted by a team of expatriate chef’s at the specialty Asian restaurant, 19 Oriental Avenue that promises an unforgettable dining experience with sophisticated music performances and a choice of unlimited select beverages with a live band to liven things up. Priced at Rs. 5,500 plus taxes per person, the Asian buffet spread with unlimited select alcoholic beveragescomes for Rs.2000 plus taxes for kids below 12 years old.Usher in the New Year with joy as you dance the night away on popular tunes belted out by a live band and guest DJ Harry. Relish a decadent variety of appetizers with a choice of free flowing select beverages.This New Year’s Eve, Island Bar is the perfect destination for party revellers at Rs. 3000 plus taxes per person inclusive of appetizers and unlimited select alcoholic beverages. Book in and have a great new year!last_img read more

August 31

No tax hike no new ones Upadhyay

first_imgRejecting all tax ‘hike and new tax’ proposals by the three municipal commissioners in the city, Delhi BJP president Satish Upadhyay on Thursday said that civic bodies cannot be made ‘earning units’ of the government.‘We are against any-type of tax hike or new taxes. The civic bodies should levy taxes but not burden them as they are already facing price rise in the city,’ said Upadhyay, rejecting the tax proposals and tax hikes by the three civic bodies in the city. Also Read – Company director arrested for swindling Rs 345 croreThe commissioners of North MCD, South MCD, East MCD had proposed 45 to 50 percent hike in property taxes on the basis of consumer price index, doubling one time parking charge and levying new taxes like professional tax, and naming fee. ‘The obligatory functions of the civic bodies are to provide basic civic amenities to the citizens- like primary education, primary health and sanitation. The government should provide budget to the civic bodies as these services are not charged,’ he added. Also Read – Man who cheated 20 women on matrimonial websites arrested‘We are of the view that civic bodies should bring more tax payers under the tax net. The hike in tax rates or levying new taxes would be a burden on honest tax payers,’ said Subhash Arya, chairman of standing committee in South MCD. ‘We will direct the commissioners to bring maximum tax payable citizens under existing tax net and prevent leakage of revenue by strict implementation of tax collection,’ added Arya, the veteran councillor who is also considered to be the voice of BJP on civic matters. Presently, around one third properties in the city are paying property taxes to the civic bodies and two more sources of income — outdoor advertisement and parking; are also in the control of mafias. In addition, the corporations have several vacant plots which the commissioners have been promising to redevelop as commercial complexes since past three years but no vein.last_img read more

August 31

SAIL RINL modernising to expand hot metal capacities in a big way

first_img“SAIL and RINL are executing modernisation and expansion plan aimed at increasing their hot metal capacity to 23.1 million tonnes per annum (MTPA) and 7.3 MTPA, respectively by 2016-17,” Mines and Steel Minister Narendra Singh Tomar said in a reply to Lok Sabha.PSUs — Steel Authority of India Ltd (SAIL), Rashtriya Ispat Nigam Ltd (RINL) and NMDC — are in the process of implementing significant expansion in the crude/finished steel capacities in their respective brown field/greenfield locations, the minister said. NMDC, he said, is constructing a three MTPA greenfield integrated steel plant in Chhattisgarh and the project is in construction stage. Also Read – I-T issues 17-point checklist to trace unaccounted DeMO cashWhile, SAIL has eight steel plants in states like West Bengal, Chhattisgarh and Odisha, RINL is operating one steel plant in Andhra Pradesh, he said. Moreover, Iron ore imports have increased sharply to 5.63 million tonnes in 2014-15 till November as against 0.37 million tonnes in previous financial year, the government said on Monday.“The import of iron ore has increased from 0.37 million tonnes (MT) in year 2013-14 to 5.63 MT in the year 2014-15 (April-November),” Minister of State for Steel and Mines Vishnu Deo Sai said in a reply to the Lok Sabha. The minister further said there is no acute shortage of raw material like iron ore. However, there are regional shortages of iron ore due to Supreme Court’s decisions regarding lease renewal in Goa and Odisha and cancellation of mining leases in Karnataka. “Coking coal which is used in steel making is largely imported into India due to its non-availability,” the minister said. Also Read – Lanka launches ambitious tourism programme to woo Indian touristsIron ore imports in 2012-13 were at 3.05 MT while in the previous 2011-12 year imports were 0.97 MT, the minister said. He further said that as per the report of the Working Group on Steel for the 12th Five Year Plan for 2016-17, the iron ore requirement is 206.2 MT for crude steel production capacity of 125.9 MT. At present 21 per cent of crude steel production is being done by public sector and 79 per cent of crude steel production is being done by private sector. Meanwhile, mining sector FDI jumped to $657.46 million in the April-December period of this fiscal as compared with just $12.73 million in the entire 2013-14 fiscal, Parliament was informed on Monday. Coal auctions skewed, iron & steel cos tell HCIron and steel companies on Monday argued before the Delhi High Court that the Centre’s decision to club all end-uses, except power, under unregulated sector has led to a “skewed” bidding process in which unequals are competing with each other for mines.The submission was made before a bench of justices Badar Durrez Ahmed and Sanjeev Sachdeva by Bhushan Steel and Power Ltd, Utkal Coal Ltd and Monet Ispat and Energy Ltd which have challenged the Coal Ministry’s decision to club all other sectors, except power, under one category.The bench listed the companies’ pleas for further hearing on March 4 and also issued a notice to the Coal Ministry and sought its response, on that date, on the plea of D B Power Ltd which has challenged merger of two blocks — Durgapur-II Taraimar and Durgapur-II Sariya — in Chhattisgarh.last_img read more

August 31

Drink up

first_imgBHANG INFUSED RABRI PANNA COTTAIngredients Quantity Fresh Cream 300 MlMilk 200 MlSugar 50 GramsGelatin 3 SheetsRabri 100 GramsBhang 35 GramsMethodSoak the bang in ½ cup of water over night.Make the Bhang paste to use in panna cotta. Soak the gelatin in iced water. Luke warm the cream and milk together with sugar add the gelatin in it now add the bhang paste mix it well until well combined let it infuse for couple of minutes than pour this mix in shot glasses refrigerate for 2 – 3 hours pour the thin layer of fresh Rabri equally over the panna cotta sprinkle few chopped almonds and pistachio on top before serve. Enjoy your Holi with this wonderful home made dessert.Mango Mint CoolerBlend mango juice (120 ML) with fresh mint leaves and crushed ice. Top up with lemonadeCoconut delight      Blend 60 ML Fresh coconut water with coconut puree and crushed ice. Garnish with red cherry and serve frozen.Vanilla symphonyMix 300 ml Vanilla flavor cold milk with Roohafza and top up with whipped cream and chocolate flakeslast_img read more

August 31

Poll fallout Families of those killed seek exemplary punishment

first_imgKolkata: The next of kin and relatives of the Trinamool Congress workers who were killed by goons allegedly enjoying patronage of BJP and CPI-M, have demanded exemplary punishment of the criminals.So far, 10 Trinamool leaders and workers have been killed – six on the day of the Panchayat election on May 14 and four during post poll violence.”It is unfortunate that Prime Minister Narendra Modi, who is blaming Trinamool for the poll related violence in Bengal, should know that the violence here has been engineered by his party workers, along with CPI-M. He should be ashamed of the atrocities of his partymen,” said the family members and relatives of Ujjal Sur, a resident of Gopal Kaviraj Road in Habra in North 24-Parganas. Also Read – Heavy rain hits traffic, flightsSur, a Trinamool Congress supporter, had raised his voice against the goons allegedly backed by CPI-M and BJP in the polling stations on May 14. When he was returning home, the criminals accosted him and beat him up with iron rods and sticks and then left him on the road in a pool of blood. He was declared brought dead when taken to hospital. Sur’s family members alleged that BJP and CPI-M had unleashed a reign of terror in the area before the polls. Also Read – Speeding Jaguar crashes into Merc, 2 B’deshi bystanders killedIt may be recalled that state Food minister Jyotipriyo Mullick had alleged that BJP had engaged criminals from Bangladesh, to create trouble in vast areas surrounding Habra.Thirty -eight-year-old Aditya Singh Mallah, another Trinamool Congress supporter, was attacked by BJP and CPI-M goons in Purulia and killed during post poll violence. “My brother was loved by all in the locality. He was a Trinamool activist and we never thought that he would be killed in broad daylight near our house,” said Aditya’s elder brother, adding “we want stringent action against the criminals.” “Arrest Kanti Ganguly and Sujan Chakraborty and punish them, for they have created trouble in the area,” said Arif Ali Gazi’s wife. Gazi, a resident of Kultuli in South 24-Parganas, was also murdered. Demands to arrest the BJP and CPI-M backed miscreants were also raised by the relatives of Krishnapada Sarkar, a resident of Tehatta in Nadia. The miscreants had attacked him with sharp weapons, killing him on the spot. They had also set a couple of motorcycles on fire, to scare the people of the area. The residents alleged that the goons had threatened Sarkar, not to raise his voice against them. Sarkar had refused and paid a price for it.Political experts said CPI-M has received a fresh gush of adrenalin because of BJP and the duo is trying to unleash a reign of terror in rural Bengal, thereby trying to defame the state government. “CPI-M has always tried to reap the benefit of confusion and they are trying this tactic once again,” a political expert said.last_img read more