Zobrazeno 1 - 10
of 3 182
pro vyhledávání: '"Babichev AS"'
We study domain walls (DWs) arising in field theories where $Z_2$-symmetry is spontaneously broken by a scalar expectation value decreasing proportionally to the Universe temperature. The energy density of such melting DWs redshifts sufficiently fast
Externí odkaz:
http://arxiv.org/abs/2410.21971
Autor:
Babichev, Andrey, Pirogov, Evgeniy, Sobolev, Maksim, Blokhin, Sergey, Shernyakov, Yuri, Maximov, Mikhail, Lutetskiy, Andrey, Pikhtin, Nikita, Karachinsky, Leonid, Novikov, Innokenty, Egorov, Anton, Tian, Si-Cong, Bimberg, Dieter
A detailed experimental analysis of the impact of active region design on the performance of 1300 nm lasers based on InGaAs/InAlGaAs superlattices is presented. Three different types of superlattice active regions and waveguide layer compositions wer
Externí odkaz:
http://arxiv.org/abs/2408.02469
Autor:
Babichev, Eugeny, Charmousis, Christos, Muntz, Benjamin, Padilla, Antonio, Saltas, Ippocratis D.
We revisit multi-messenger constraints from neutron star mergers on the speed of propagation of gravitational and electromagnetic waves in Horndeski and beyond Horndeski theories. By considering non-trivial couplings between the dark energy field and
Externí odkaz:
http://arxiv.org/abs/2407.20339
Autor:
Babichev, Andrey, Makhov, Ivan, Kryzhanovskaya, Natalia, Blokhin, Alexey, Zadiranov, Yuriy, Salii, Yulia, Kulagina, Marina, Bobrov, Mikhail, Vasiliev, Alexey, Blokhin, Sergey, Maleev, Nikolay, Tchernycheva, Maria, Karachinsky, Leonid, Novikov, Innokenty, Egorov, Anton
A comprehensive numerical modelling of microcavity parameters for micropillar lasers with optical pumping was presented. The structure with a hybrid dielectric-semiconductor top mirror has a significantly higher calculated quality-factor (~65000 for
Externí odkaz:
http://arxiv.org/abs/2407.16271
We study a subclass of Horndeski gravity which has both global conformal and shift symmetries. Global symmetries are characterised by the presence of a conserved current which has been shown to be of particular importance for the integrability featur
Externí odkaz:
http://arxiv.org/abs/2407.11157
Autor:
Babichev, Andrey, Makhov, Ivan, Kryzhanovskaya, Natalia, Troshkov, Sergey, Zadiranov, Yuriy, Salii, Yulia, Kulagina, Marina, Bobrov, Mikhail, Vasilev, Alexey, Blokhin, Sergey, Maleev, Nikolay, Karachinsky, Leonid, Novikov, Innokenty, Egorov, Anton
We report on microlasers based on high-quality micropillars with lasing on whispering-gallery modes. Usage of low-absorbing Al$\scriptsize 0.2$Ga$\scriptsize 0.8$As\Al$\scriptsize 0.9$Ga$\scriptsize 0.1$As distributed Bragg reflectors as well as the
Externí odkaz:
http://arxiv.org/abs/2407.02196
Publikováno v:
JCAP09(2024)047
Employing the publicly available CosmoLattice code, we conduct numerical simulations of a domain wall network and the resulting gravitational waves (GWs) in a radiation-dominated Universe in the $Z_2$-symmetric scalar field model. In particular, the
Externí odkaz:
http://arxiv.org/abs/2406.17053
We study new classes of metric transformations in the context of scalar-tensor theories, which involve both higher derivatives of the scalar field and derivatives of the metric itself. In general, such transformations are not invertible as they invol
Externí odkaz:
http://arxiv.org/abs/2405.13126
Autor:
Babichev, Eugeny, Charmousis, Christos, Doneva, Daniela D., Gyulchev, Galin N., Yazadjiev, Stoytcho S.
There is strong observational evidence that almost every large galaxy has a supermassive black hole at its center. It is of fundamental importance to know whether such black holes are described by the standard Kerr solution in General Relativity (GR)
Externí odkaz:
http://arxiv.org/abs/2403.16192
Static black holes in general relativity modified by a linear scalar coupling to the Gauss-Bonnet invariant always carry hair. We show that the same mechanism that creates the hair makes it incompatible with a cosmological horizon. Other scalar-tenso
Externí odkaz:
http://arxiv.org/abs/2403.15537