Zobrazeno 1 - 10
of 24
pro vyhledávání: '"Somasri Sen"'
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 518:1098-1105
In view of the recent measurement of $H_{0}$ from HST and SH0ES team, we explore the possibility of existence of a negative cosmological constant (AdS vacua in the dark energy sector) in the Universe. In this regard, we consider quintessence fields o
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::88a9bef23a78c3a860fa622d5ec92bef
https://doi.org/10.1093/mnras/stac2796
https://doi.org/10.1093/mnras/stac2796
Previous analysis of AstroSat observations of the black hole system MAXI J1535-571, have revealed the presence of a strong Quasi-Periodic Oscillation (QPO) whose frequency is correlated with the high energy spectral index. Here, we fit the spectra as
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1dad3e0b3d8ab91c01c4ee4c72b637a9
http://arxiv.org/abs/2205.11899
http://arxiv.org/abs/2205.11899
We present the spectro-timing analysis of the black hole binary system GX 339-4 using AstroSat data extracted at the beginning of outbursts in 2017 and 2019. The joint spectral fitting of LAXPC and SXT data revealed that the source was in a faint low
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::222ffc78aba54a1bd629a08c6226d7f9
While the dynamical origin of the variability observed in Galactic Black hole systems, such as quasi-periodic oscillations (QPOs), are still a matter of debate, insight into the radiative components responsible for such behaviour can be obtained by s
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e1b97ffccb617ea75c82a002580de5c9
http://arxiv.org/abs/2008.06468
http://arxiv.org/abs/2008.06468
Autor:
Somasri Sen, Narayan Banerjee
Publikováno v:
Pramana. 85:1123-1129
In the present work, it is shown that an asymptotically flat spherical black hole can have a nontrivial signature of any field for an exterior observer if the energy momentum tensor of the corresponding field is either tracefree or if the trace falls
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d9b68a34f7eb4d62ae54e74c4790e574
https://doi.org/10.1007/s12043-015-0953-4
https://doi.org/10.1007/s12043-015-0953-4
Autor:
Somasri Sen, Narayan Banerjee
Publikováno v:
Pramana. 49:609-615
The total energy of the universe has been calculated assuming that it is the sum of the contributions from the matter part and gravitational part. The calculations involve the use of Einstein pseudotensor. Calculations have been carried out in some s
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::489c2f59bfd9df298acdfe80a9a1466e
https://doi.org/10.1007/bf02848334
https://doi.org/10.1007/bf02848334
The role of a bulk graviton in predicting the signature of extra dimensions through collider-based experiments is explored in the context of a multiply warped spacetime. In particular it is shown that in a doubly warped braneworld model, the presence
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::039ca21ef6f2170e6a8214073605db4e
We consider different classes of scalar field models including quintessence, and tachyon scalar fields with a variety of generic potential belonging to thawing type. Assuming the scalar field is initially frozen at $w=-1$, we evolve the system until
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f195fa873cf3755d529b287ab369e783
http://arxiv.org/abs/0907.2814
http://arxiv.org/abs/0907.2814
We consider a string-inspired torsion-dilaton-gravity action in a Randall-Sundrum brane world scenario and show that, in an effective four-dimensional theory on the visible brane, the rank-2 antisymmetric Kalb-Ramond field (source of torsion) is expo
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::49c0bbea8d0eab30865f59519893458e
http://arxiv.org/abs/0903.0722
http://arxiv.org/abs/0903.0722
Publikováno v:
Physical Review D. 76
We consider bulk antisymmetric tensor fields of various ranks in a Randall-Sundrum scenario. We show that, rank-2 onwards, the zero-modes of the projections of these fields on the (3+1) dimensional visible brane become increasingly weaker as the rank
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2a6708c9fefd41784785b4579cdd1608
https://doi.org/10.1103/physrevd.76.121501
https://doi.org/10.1103/physrevd.76.121501