gravitons - 2026 ACF Regionals

Question

This particle has a spin of 2 because the stress–energy tensor is second order. For 10 points each:

[10e] Name this hypothetical gauge boson that mediates an attractive fundamental force.

ANSWER: gravitons

[10h] This scientist is the first namesake of a theorem that implies the graviton cannot be a composite particle because it is massless and has spin 2. This physicist also names the soft graviton theorem.

ANSWER: Steven Weinberg [accept Weinberg–Witten theorem; accept Weinberg soft graviton theorem]

[10m] As a consequence of the Weinberg–Witten theorem, a composite spin-2 graviton would violate a covariance condition named for this physicist. By the CPT theorem, any theory with CPT symmetry is invariant under this physicist’s transformations.

ANSWER: Hendrik Lorentz [accept Lorentz transformations; accept Lorentz invariance; accept Lorentz covariance]

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Summary


California (North)	Main Site	Y	3	20.00	100%	100%	0%
Canada	Main Site	Y	10	16.00	90%	60%	10%
Florida	Main Site	Y	3	16.67	67%	100%	0%
Great Lakes	Main Site	Y	5	16.00	100%	60%	0%
Midwest	Main Site	Y	8	15.00	88%	63%	0%
Northeast	Main Site	Y	6	20.00	100%	67%	33%
Overflow	Main Site	Y	4	12.50	75%	50%	0%
South Central	Main Site	Y	2	15.00	100%	50%	0%
Southeast	Main Site	Y	7	14.29	86%	57%	0%
UK	Main Site	Y	12	14.17	83%	58%	0%
Upper Mid-Atlantic	Main Site	Y	8	17.50	88%	75%	13%
Upstate NY	Main Site	Y	4	15.00	50%	100%	0%

Data


Stanford B	Berkeley A	10	0	10	20
Berkeley B	Berkeley C	10	0	10	20
Berkeley D	Stanford A	10	0	10	20
McGill A	Brock	10	0	0	10
Toronto G	Carleton University	10	0	10	20
Guelph	Western A	0	0	10	10
Waterloo B	McGill B	10	0	0	10
Western C	McMaster A	10	0	0	10
Ottawa	McMaster B	10	0	10	20
Queen's	Toronto Metropolitan	10	0	10	20
Toronto B	Toronto E	10	0	0	10
Toronto C	UBC B	10	0	10	20
Simon Fraser	Western B	10	10	10	30
Central Florida A	Central Florida B	10	0	10	20
Central Florida C	Florida A	0	0	10	10
Florida B	Florida C	10	0	10	20
CWRU A	Ohio State A	10	0	10	20
CWRU B	Michigan A	10	0	0	10
Michigan B	Ohio State B	10	0	0	10
Michigan State	Michigan C	10	0	10	20
Pittsburgh	Ohio State C	10	0	10	20
Purdue B	Chicago A	10	0	10	20
Chicago B	Purdue A	10	0	10	20
Chicago C	Northwestern B	10	0	10	20
Illinois A	Chicago D	10	0	10	20
Illinois B	Illinois C	10	0	0	10
Indiana C	Notre Dame B	0	0	0	0
Indiana A	Northwestern C	10	0	10	20
Notre Dame A	Indiana B	10	0	0	10
Dartmouth A	Bowdoin A	10	0	0	10
Brandeis B	Bowdoin B	10	10	10	30
Harvard B	Brown	10	10	10	30
Georgia Tech A	Claremont	10	0	10	20
Iowa State	Washington B	0	0	0	0
Carleton College	Missouri A	10	0	10	20
Missouri B	Washington A	10	0	0	10
Texas A	Murray State A	10	0	10	20
Texas A&M A	Texas B	10	0	0	10
Georgia Tech B	Alabama A	10	0	10	20
Georgia Tech D	Bruin	10	0	10	20
Alabama B	Georgia Tech C	10	0	0	10
Mississipi State	Tennessee B	0	0	0	0
Louisville B	Sewanee	10	0	0	10
WashU A	Tennessee A	10	0	10	20
Kentucky	Vanderbilt B	10	0	10	20
Oxford A	Bristol	10	0	10	20
Cambridge C	Imperial C	10	0	10	20
Cardiff	Southampton A	0	0	0	0
Oxford B	City St. George's	10	0	0	10
Imperial A	Durham	10	0	0	10
Edinburgh A	Oxford C	10	0	0	10
LSE	Edinburgh B	10	0	10	20
Montpellier	Manchester	0	0	0	0
Imperial B	Southampton B	10	0	10	20
Cambridge B	UCL	10	0	10	20
Warwick A	Birmingham	10	0	10	20
Warwick B	Cambridge A	10	0	10	20
Yale	Brandeis A	10	0	0	10
Columbia A	Vassar	10	0	10	20
John Jay	Maryland B	10	0	10	20
Johns Hopkins A	Columbia B	10	0	0	10
Maryland A	Columbia C	10	0	10	20
Georgetown	Maryland C	0	0	0	0
NYU A	Johns Hopkins B	10	10	10	30
NYU B	Catholic	10	0	10	20
NYU C	Swarthmore	10	0	10	20
Cornell A	Binghamton B	0	0	10	10
Cornell C	Binghamton A	10	0	10	20
Cornell B	RIT	10	0	10	20
Penn State	Rochester	0	0	10	10
Harvard A	Dartmouth B	10	0	10	20
MIT	Southern Connecticut State	10	0	10	20