Joe McNally/Getty Images

完成爱因斯坦开启的事业

哥德堡—很久很久以前,在很远很远的银河系深处,有两个巨大的黑洞——每一个的质量都要比太阳大大约30倍——发生了碰撞和合并,释放出短暂而强大的引力波爆发。这次爆发所产生的能量以光速在宇宙间传播,将其能量稀释在广袤无垠的太空中。

十亿多年后,这次爆发的能量以极其微弱的信号抵达地球,大约持续了十分之一秒。2015年9月14日,来自美国激光干涉引力波观测台(LIGO)的科学家在他们的工具中捕捉到了引力波所发出的弱弱的鸣叫——由此,爱因斯坦100年前所做出的预言第一次得到了证实。

LIGO在美国国家科学基金会的指导下工作,动用了两台先进的干涉仪。这两台高科技奇观坐落在美国的两端,利用光的干涉原理运行,投入不久就成功测量到了引力波(称为GW150914)。它们通过测量干涉仪臂长的变化监测到引力波所引起的时空几何的扭曲。在GW150914的例子中,干涉仪臂长变化不到质子大小的千分之一。

To continue reading, please log in or enter your email address.

Registration is quick and easy and requires only your email address. If you already have an account with us, please log in. Or subscribe now for unlimited access.

required

Log in

http://prosyn.org/0rLW8p2/zh;
  1. Television sets showing a news report on Xi Jinping's speech Anthony Wallace/Getty Images

    Empowering China’s New Miracle Workers

    China’s success in the next five years will depend largely on how well the government manages the tensions underlying its complex agenda. In particular, China’s leaders will need to balance a muscular Communist Party, setting standards and protecting the public interest, with an empowered market, driving the economy into the future.

  2. United States Supreme Court Hisham Ibrahim/Getty Images

    The Sovereignty that Really Matters

    The preference of some countries to isolate themselves within their borders is anachronistic and self-defeating, but it would be a serious mistake for others, fearing contagion, to respond by imposing strict isolation. Even in states that have succumbed to reductionist discourses, much of the population has not.

  3.  The price of Euro and US dollars Daniel Leal Olivas/Getty Images

    Resurrecting Creditor Adjustment

    When the Bretton Woods Agreement was hashed out in 1944, it was agreed that countries with current-account deficits should be able to limit temporarily purchases of goods from countries running surpluses. In the ensuing 73 years, the so-called "scarce-currency clause" has been largely forgotten; but it may be time to bring it back.

  4. Leaders of the Russian Revolution in Red Square Keystone France/Getty Images

    Trump’s Republican Collaborators

    Republican leaders have a choice: they can either continue to collaborate with President Donald Trump, thereby courting disaster, or they can renounce him, finally putting their country’s democracy ahead of loyalty to their party tribe. They are hardly the first politicians to face such a decision.

  5. Angela Merkel, Theresa May and Emmanuel Macron John Thys/Getty Images

    How Money Could Unblock the Brexit Talks

    With talks on the UK's withdrawal from the EU stalled, negotiators should shift to the temporary “transition” Prime Minister Theresa May officially requested last month. Above all, the negotiators should focus immediately on the British budget contributions that will be required to make an orderly transition possible.

  6. Ksenia Sobchak Mladlen Antonov/Getty Images

    Is Vladimir Putin Losing His Grip?

    In recent decades, as President Vladimir Putin has entrenched his authority, Russia has seemed to be moving backward socially and economically. But while the Kremlin knows that it must reverse this trajectory, genuine reform would be incompatible with the kleptocratic character of Putin’s regime.

  7. Right-wing parties hold conference Thomas Lohnes/Getty Images

    Rage Against the Elites

    • With the advantage of hindsight, four recent books bring to bear diverse perspectives on the West’s current populist moment. 
    • Taken together, they help us to understand what that moment is and how it arrived, while reminding us that history is contingent, not inevitable


    Global Bookmark

    Distinguished thinkers review the world’s most important new books on politics, economics, and international affairs.

  8. Treasury Secretary Steven Mnuchin Bill Clark/Getty Images

    Don’t Bank on Bankruptcy for Banks

    As a part of their efforts to roll back the 2010 Dodd-Frank Act, congressional Republicans have approved a measure that would have courts, rather than regulators, oversee megabank bankruptcies. It is now up to the Trump administration to decide if it wants to set the stage for a repeat of the Lehman Brothers collapse in 2008.