Question
The square root of a quantity denoted by this letter approximates the linear structure growth rate f and is strongly correlated with sigma-8. Jim Peebles defines the dimensionless parameter E as the harmonic mean of several quantities denoted by this letter, weighted by powers of a. The cube root of a ratio of two quantities denoted by this letter determines when the matter-dominated era ended. A dimensionless value approximately equal to 0.7 is denoted “[this letter]-sub-lambda,” while similar values are about 0.05 for baryons and 0.3 for matter. Another value denoted by this letter was measured to be approximately one by the Planck collaboration, implying that the universe has almost zero curvature. For 10 points, name this Greek letter that represents the ratio between energy density and the critical density, the density parameter. ■END■
Summary
2025 ACF Nationals | 04/19/2025 | Y | 24 | 29% | 0% | 38% | 94.43 |
Buzzes
Player | Team | Opponent | Buzz Position | Value |
---|---|---|---|---|
Russell Nip | British Columbia | Ottawa | 64 | 10 |
Rasheeq Azad | North Carolina A | Indiana | 64 | -5 |
Athena Shadden | Texas | Iowa State | 67 | -5 |
Jeremy Cummings | WUSTL A | UC Berkeley A | 71 | 10 |
Geoffrey Wu | Columbia A | Waterloo A | 73 | 10 |
Shardul Rao | Minnesota | Virginia Tech | 75 | -5 |
William Groger | Columbia B | Cornell B | 93 | 10 |
Yashwanth Bajji | Michigan | UCF | 103 | -5 |
June Yin | WUSTL B | Georgia State | 104 | -5 |
Tim Morrison | Stanford | Illinois A | 107 | -5 |
Matt Schiavone | Northwestern | Chicago A | 109 | -5 |
Teigue Kelly | Penn State | Arizona State | 110 | -5 |
Liam Starnes | Chicago B | Georgia Tech | 112 | -5 |
Gavin Markoff | Vanderbilt | Illinois B | 113 | 10 |
Anuttam Ramji | UC Berkeley B | NYU | 114 | 10 |
Bryan Ugaz | Arizona State | Penn State | 133 | 0 |
Adam Fine | Chicago A | Northwestern | 133 | 0 |
Amogh Kulkarni | Georgia State | WUSTL B | 133 | 0 |
Rohan Dalal | Georgia Tech | Chicago B | 133 | 0 |
Jonathan Huang | MIT | Harvard | 133 | 10 |
Alex Akridge | Indiana | North Carolina A | 133 | 0 |
Jason Zhang | Toronto C | Johns Hopkins | 133 | 0 |
David Bass | Johns Hopkins | Toronto C | 133 | 0 |
Leo Law | Florida | LSE | 133 | 0 |
Andy Huff | LSE | Florida | 133 | 0 |
Noah Chin | Virginia Tech | Minnesota | 133 | 0 |
Soren Heydari | North Carolina B | Virginia | 133 | 0 |
Joseph Chambers | Virginia | North Carolina B | 133 | 0 |
Calvin Bostleman | Ohio State | RIT | 133 | 0 |
Cade Reinberger | RIT | Ohio State | 133 | 0 |
Aum Mundhe | Rutgers | Toronto A | 133 | 0 |
Benjamin Chapman | Toronto A | Rutgers | 133 | 0 |
Andrew Wang | Illinois A | Stanford | 133 | 0 |
Conor Thompson | Iowa State | Texas | 133 | 0 |
Kunaal Chandrashekar | Toronto B | Cornell A | 133 | 0 |
Richard Niu | Cornell A | Toronto B | 133 | 0 |
Shiva Tegulla | UCF | Michigan | 133 | 0 |
James Ah Yong | Waterloo B | Yale | 133 | 0 |
Henry Bon | Winona State | Maryland | 133 | 0 |
Andy Yu | Maryland | Winona State | 133 | 0 |