• 2017 Farewell Party

    The 2017 LeCosPA Farewell Party was held in the evening of June 14. It was not only a celebration for the end of the the semester, but also a farewell party to some of partners who are going to leave LeCosPA next semester. Firstly, Yu-Hsiang Lin, our theoretical student got his PhD, and will pursue […]

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    2017 LeCosPA Table Tennis Tournament

     This year, Theory Team wins the trophy ! The 2017 LeCosPA Annual Table Tennis Tournament was held in the afternoon of May 19. This annual tournament witnesses the continuing fight for dominance between LeCosPA’s Theory Group and Experiment Group. In this game, it is a fierce competition between the two groups and both of them […]

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  • New black hole simulator may shed more light on contradiction in fundamental physics

    「類比黑洞」可能解答四十年未決的重要物理悖論

    Fig.1: Accelerating mirror mimics evaporating black hole. Left: Black hole Hawking evaporation and the trapping of the partner modes near the horizon. Right: An accelerating mirror also has a horizon and can also emit Hawking particles and trap their partner modes. The analogy between these two systems may be appreciated via Einstein’s equivalence principle 圖一:加速反射鏡可以模擬黑洞霍京蒸發。左:黑洞霍京輻射及其被困在黑洞事件視平線的對偶型。右:一個加速的反射鏡也有視平線,也會輻射霍京粒子及困住對偶型。兩者的相似性可以從愛因思坦的「等價原理」來理解。 […]

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  • ANITA-IV mission launced from Antarctica on December 3rd 2016

    Figure 1: The BOSS (launch vehicle) hangs the ANITA-IV and waits for the completion of inflation. ANITA-IV was launched form the Ross ice shelf near the McMurdo station, the foot of a mountain behind the balloon. Before the launch, The LDB field coordinator will launch pilot balloons to check the weather status. If the weather […]

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  • Kerson Huang, Distinguished Fellow of LeCosPA, dies at 88

    Based on MIT News :Scott Morley | Laboratory for Nuclear Science September 9, 2016 MIT Professor Emeritus and NTU LeCosPA distinguished fellow Kerson Huang, who was well known for his contributions to the field of statistical physics, passed away on Sept. 1 at the age of 88. He had recently been in hospice care at […]

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    2016 LeCosPA Table Tennis Tournament

    2016 LeCosPA Table Tennis Tournament After two years, Theory Team wins the trophy back! The 2016 LeCosPA Annual Table Tennis Tournament was held in the afternoon of June 24. This annual tournament witnesses the continuing fight for dominance between LeCosPA’s Theory Group and Experiment Group. In the past two years, Experiment Team had the upper […]

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    Congratulation! 2016 NTU-CTS Best Paper Award goes to LeCosPA Students: Hsu-Wen Chiang, Yao-Chieh Hu, and Yu-Hsiang Lin; Che-Yu Chen wins CTS Student Scholarship.

    From left to right: Yu-Hsiang Lin, Che-Yu Chen, Prof. Pisin Chen, Yao-Chieh Hu, and Hsu-Wen Chiang.   LeCosPA students in the theory group: Che-Yu Chen, Hsu-Wen Chiang, Yao-Chieh Hu and Yu-Hsiang Lin won the “2016 best paper award” from the Center for Theoretical Science, National Taiwan University (NTU-CTS). In addition, Che-Yu Chen was also awarded […]

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    臺大梁次震中心成功發射伽瑪射線爆人造衛星望遠鏡

     The UFFO Tracking Space Telescope, designed to capture the early moment of Gamma-Ray Bursts for the first time, was launched onboard Lomonosov spacecraft through Soyuz 2.1a at Vostochny Cosmodrome ! 圖: 黃建中、Jakub Ripa、劉宗哲、Jiwoo Nam、梁次震中心主任陳丕燊、NSPO陳嘉瑞、陳政維(左起) The UFFO Tracking Space Telescope, designed to capture the early moment of Gamma-Ray Bursts for the first time, was launched onboard […]

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    Full-Frontal Physics

    In what would seem like a bad romance novel, physicists, using words like “naked” and “no-drama,” are attempting to write the Universe’s hottest work of non-fiction, a complete description of the weirdest objects known to humanity: black holes. By Ross Lockwood on April 11, 2016 For the last four years, physicists studying the mathematical underpinnings […]

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  • The Last Prediction by Einstein is Verified: Scientists Announce The First Direct Detection Of Gravitational Waves

    愛因斯坦最後的預測得到證實:科學家宣佈首次偵測到重力波

    文章 艾若哲 / 翻譯 陳勁豪 2016年二月十一日,來自LIGO及VIRGO兩個團隊的一群國際科學家正式宣佈發現了愛因斯坦於一百年前所預測的重力波的存在。 LIGO計畫的主持人David Reitze教授在華盛頓在座無虛席的記者會現場宣佈:”各位女士先生,我們已經偵測到了重力波。我們做到了。” 重力波是時空結構受到擾動所產生的漣漪。根據愛因斯坦的廣義相對論,當帶有質量的物體運動的時候,就會產生重力波。 兩部LIGO偵測器是在2015年九月十四日世界標準時間上午九點五十分四十五秒偵測到重力波的訊號。這個重力波訊號是由離地球十三億光年遠的兩個雙星黑洞於合併的過程中所放出,而且約略是由南半球的方向傳來的。 這兩個相互碰撞的黑洞質量分別為36跟29個太陽質量,而碰撞過程中的最大速度約略是光速的60%。這個重力波的訊號大約維持了0.2秒,合併過程中所放出的總能量相當於三個太陽質量。因此所放出的總能量約略是當時可見宇宙所放出的總能量的五十倍。兩個黑洞合併後的新黑洞,質量大約是62個太陽質量。 這些重力波經過了十三億年的旅行而被偵測器探測到。重力波對偵測器產生了極微小的形變,約略是質子尺寸的千分之一而已。 這個歷史性的發現之所以重要是因為這是對愛因斯坦的廣義相對論最後一個重要預測的直接觀測證據。 這個重要的新發現將對尋找量子重力理論的發展產生影響,這也是台大梁次震宇宙學與粒子天文物理學研究中心的主要研究課題之一。 與此發現的一系列相關論文可以在arXiv網站及LIGO的官方網站上找到。刊載這個重要發現的論文已經發表於物理評論通訊(Physical Review Letters)上。更技術性的討論可以參考此連結 更多關於偵測器與研究團隊的資訊 雷射干涉重力波觀測站(Laser Interferometer Gravitational-Wave Observatory, LIGO)是一個由兩具完全相同的L型偵測器所構成的實驗。每具L型偵測器的兩臂各約4公里長,並分別設置在美國路易斯安那州的Livingston及華盛頓州的Hanford。這些偵測器可以偵測到偵測器兩臂因為重力波影響所造成的微小形變。這個實驗主要由麻省理工學院及加州理工學院的研究人員所建立而成,並由美國的國家科學基金會及其他國際團隊共同出資。 VIRGO位於義大利比薩附近,是一個類似LIGO的偵測器。VIRGO預計今年稍晚會重新開始運作。LIGO跟VIRGO團隊由來自15個國家,80個研究單位,共約一千位科學家所共同組成。更多關於LIGO跟VIRGO的介紹可以參考以下網站:http://www.ligo.org/ http://public.virgo-gw.eu/language/en/

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