Preparation and protective surface coatings for low density C/C composite for harden insulation

Testing local Lorentz invariance with gravitational waves

“…This fact underscores the added value of the discovery of gravitational waves in the context of studies of the foundations of relativistic gravity. The result (10) represents the first bound on all birefringent coefficients at d = 6 and is competitive with existing laboratory bounds [24][25][26].…”

“…Laboratory [7][8][9][10][11][12][13][14] and analytical [15][16][17][18][19][20][21][22] investigations using this pure-gravity effective field theory have largely concentrated on minimal Lorentz-violating operators, which have dimension d = 4. Theoretical aspects of nonminimal operators with dimensions d = 5, 6 have been studied [23], and constraints on some nonrelativistic combinations of operators with d = 6 have been obtained via laboratory tests of short-range gravity [24][25][26]. The tighest constraints to date on local Lorentz violation in the gravity sector have been deduced from the absence of gravitationalČerenkov radiation by cosmic rays [30][31][32][33][34][35][36] with a large class of effects for d = 4, 6, and 8 now being excluded at sharp levels [35].…”

Constraints on Lorentz violation from gravitational Čerenkov radiation

“…The d = 4 coefficient s µν ≡ (s (4) ) µν appears in the minimal Lorentz-violating extension of GR and has been the subject of various experimental tests [4][5][6][7][8][9][10][11]. Nonrelativistic effects from some components of the second term (s (6) ) µν αβ have recently been experimentally constrained as well [19][20][21].…”

“…Within the pure-gravity sector of this framework, most experimental studies [4][5][6][7][8][9][10][11] and theoretical investigations [12][13][14][15][16][17] have focused on minimal operators for Lorentz violation, which have mass dimension d = 4. Some observational consequences of nonminimal operators of dimensions d = 5, 6 are known [18], and experimental studies of nonrelativistic effects of d = 6 operators on short-range gravity have recently been performed [19][20][21]. For reviews see, for example, Refs.…”

Structural and chemical analysis of ternary SiCXNY thin films deposited by improved hot filament chemical vapour deposition

“…Silicon carbon nitrogen (SiC X N Y ) is a new kind of ternary compound semiconductor material, [1][2][3][4][5] which has attracted much attention for its exceptional optical, electrical, thermal and mechanical properties that might be inherited from both SiC and Si 3 N 4 , 6 both of which are well known as wide band gap semiconductors (y2?3 eV for 3C-SiC and y5?1 eV for a-Si 3 N 4 ). As is expected, considerable studies have indicated that SiC X N Y material would also be a wide band gap semiconductor.…”